{"id":28110,"date":"2026-01-02T12:15:44","date_gmt":"2026-01-02T12:15:44","guid":{"rendered":"https:\/\/leweiprecision.com\/?p=28110"},"modified":"2026-02-04T12:15:31","modified_gmt":"2026-02-04T12:15:31","slug":"4340%e9%8b%bc%e3%81%ae%e7%89%b9%e6%80%a7%e3%81%a8%e7%94%a8%e9%80%94%e3%81%8a%e3%82%88%e3%81%b3%e5%8a%a0%e5%b7%a5%e3%81%ab%e9%96%a2%e3%81%99%e3%82%8b%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89","status":"publish","type":"post","link":"https:\/\/leweiprecision.com\/ja\/4340%e9%8b%bc%e3%81%ae%e7%89%b9%e6%80%a7%e3%81%a8%e7%94%a8%e9%80%94%e3%81%8a%e3%82%88%e3%81%b3%e5%8a%a0%e5%b7%a5%e3%81%ab%e9%96%a2%e3%81%99%e3%82%8b%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89\/","title":{"rendered":"4340\u92fc\uff1a\u7279\u6027\u3001\u7528\u9014\u3001\u52a0\u5de5\u306b\u95a2\u3059\u308b\u5b8c\u5168\u30ac\u30a4\u30c9"},"content":{"rendered":"<h2 class=\"wp-block-heading\"><strong>\u306f\u3058\u3081\u306b<\/strong><\/h2>\n\n\n\n<p>\u58ca\u308c\u308b\u3053\u3068\u306a\u304f\u6975\u5ea6\u306e\u30b9\u30c8\u30ec\u30b9\u306b\u8010\u3048\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u90e8\u54c1\u3092\u88fd\u9020\u3057\u3066\u3044\u307e\u3059\u304b\uff1f <strong><a href=\"https:\/\/leweiprecision.com\/ja\/%e3%82%b5%e3%83%bc%e3%83%93%e3%82%b9\/%e7%b2%be%e5%af%86%e5%8a%a0%e5%b7%a5\/\">4340\u30b9\u30c1\u30fc\u30eb<\/a><\/strong> \u304c\u3042\u306a\u305f\u306e\u7b54\u3048\u304b\u3082\u3057\u308c\u306a\u3044\u3002\u3053\u306e\u9ad8\u5f37\u5ea6\u5408\u91d1\u306f\u3001\u98db\u884c\u6a5f\u3001\u81ea\u52d5\u8eca\u3001\u6a5f\u68b0\u306a\u3069\u306e\u904e\u9177\u306a\u4ed5\u4e8b\u306b\u3082\u8010\u3048\u308b\u3002\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001\u3053\u306e\u5408\u91d1\u306e\u69cb\u9020\u3001\u4e3b\u306a\u7279\u5fb4\u3001\u6b63\u3057\u3044\u4f7f\u3044\u65b9\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5f37\u5ea6\u3068\u976d\u6027\u306b\u304a\u3044\u3066\u30c8\u30c3\u30d7\u30fb\u30d4\u30c3\u30af\u3067\u3042\u308b\u7406\u7531\u304c\u304a\u308f\u304b\u308a\u3044\u305f\u3060\u3051\u308b\u3067\u3057\u3087\u3046\u3002\u7279\u306b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u52a0\u5de5\u306b\u95a2\u3059\u308b\u30d2\u30f3\u30c8\u3092\u53d6\u308a\u4e0a\u3052\u307e\u3059\u3002 <strong><a href=\"https:\/\/leweiprecision.com\/ja\/%e3%82%b5%e3%83%bc%e3%83%93%e3%82%b9\/cnc%e5%8a%a0%e5%b7%a5\/\">CNC\u52a0\u5de5\u30b5\u30fc\u30d3\u30b9 <\/a><\/strong>\u3088\u304f\u3042\u308b\u843d\u3068\u3057\u7a74\u3092\u907f\u3051\u308b\u305f\u3081\u306e4340\u30b9\u30c1\u30fc\u30eb\u3002\u3055\u3089\u306b\u3001\u3042\u306a\u305f\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u5fc5\u8981\u306a\u30b3\u30b9\u30c8\u3068\u9078\u629e\u80a2\u306b\u3064\u3044\u3066\u306e\u30a2\u30c9\u30d0\u30a4\u30b9\u3082\u5f97\u3089\u308c\u307e\u3059\u3002\u6700\u5f8c\u306b\u306f\u30014340\u304c\u3042\u306a\u305f\u306e\u30cb\u30fc\u30ba\u306b\u5408\u3063\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u304c\u308f\u304b\u308b\u3067\u3057\u3087\u3046\u3002\u9069\u5207\u306a\u92fc\u6750\u3092\u9078\u3076\u3053\u3068\u3067\u3001\u5b89\u5168\u6027\u3092\u9ad8\u3081\u306a\u304c\u3089\u6642\u9593\u3068\u8cbb\u7528\u3092\u7bc0\u7d04\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u304b\u3089\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u822a\u7a7a\u5b87\u5b99\u5206\u91ce\u3067\u306f\u3001CNC\u6a5f\u68b0\u52a0\u5de5\u30b5\u30fc\u30d3\u30b94340\u92fc\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u9ad8\u8377\u91cd\u4e0b\u3067\u3082\u90e8\u54c1\u3092\u9577\u6301\u3061\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3055\u3042\u3001\u98db\u3073\u8fbc\u3082\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4340\u30b9\u30c1\u30fc\u30eb\u3068\u306f\uff1f<\/strong><\/h2>\n\n\n\n<p>4340\u92fc\u306f\u3001\u9ad8\u3044\u5f37\u5ea6\u3068\u976d\u6027\u3067\u77e5\u3089\u308c\u308b\u4f4e\u5408\u91d1\u92fc\u3067\u3042\u308b\u3002\u30cb\u30c3\u30b1\u30eb\u3001\u30af\u30ed\u30e0\u3001\u30e2\u30ea\u30d6\u30c7\u30f3\u3092\u542b\u307f\u3001\u666e\u901a\u70ad\u7d20\u92fc\u306e\u4e2d\u3067\u3082\u969b\u7acb\u3063\u3066\u3044\u307e\u3059\u3002\u75b2\u52b4\u3084\u885d\u6483\u306b\u8010\u3048\u308b\u5fc5\u8981\u306e\u3042\u308b\u90e8\u54c1\u306b\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4ed6\u306e\u92fc\u3088\u308a\u30824340\u3092\u9078\u3076\u7406\u7531<\/strong><\/h3>\n\n\n\n<p>\u786c\u5316\u6027\u306b\u512a\u308c\u3001\u539a\u3044\u90e8\u5206\u3067\u3082\u5747\u4e00\u306b\u5f37\u5ea6\u304c\u5897\u3059\u3002\u3053\u308c\u306f\u3001\u5747\u4e00\u306a\u5f37\u5ea6\u304c\u91cd\u8981\u306a\u5927\u578b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u8edf\u92fc\u3068\u306f\u7570\u306a\u308a\u30014340\u306f\u30ab\u30b9\u30bf\u30e0\u7279\u6027\u306e\u305f\u3081\u306e\u71b1\u51e6\u7406\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u7c21\u5358\u306a\u6b74\u53f2\u3068\u898f\u683c<\/strong><\/h3>\n\n\n\n<p>1900\u5e74\u4ee3\u521d\u982d\u306b\u958b\u767a\u3055\u308c\u305f4340\u306f\u3001AISI\u898f\u683c\u306b\u9069\u5408\u3057\u3066\u3044\u308b\u3002UNS G43400\u3068\u3082\u547c\u3070\u308c\u308b\u30022024\u5e74\u306e\u4e16\u754c\u306e\u9244\u92fc\u751f\u7523\u91cf\u306f18\u51043,000\u4e07\u30c8\u30f3\u306b\u9054\u3057\u30014340\u306e\u3088\u3046\u306a\u5408\u91d1\u306f\u9ad8\u5ea6\u306a\u7528\u9014\u3067\u9700\u8981\u304c\u4f38\u3073\u3066\u3044\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4340\u92fc\u306e\u5316\u5b66\u6210\u5206<\/strong><\/h2>\n\n\n\n<p>4340\u30b9\u30c1\u30fc\u30eb\u306e\u69cb\u6210\u304c\u30d1\u30ef\u30fc\u3092\u4e0e\u3048\u3066\u3044\u308b\u3002\u9244\u306f95-96%\u3092\u69cb\u6210\u3059\u308b\u3002\u305d\u306e\u4ed6\u306e\u5143\u7d20\u304c\u5f37\u5ea6\u3092\u9ad8\u3081\u3066\u3044\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4e3b\u8981\u8981\u7d20\u3068\u305d\u306e\u5f79\u5272<\/strong><\/h3>\n\n\n\n<p>\u30ab\u30fc\u30dc\u30f3\uff080.38\uff5e0.43%\uff09\u306f\u786c\u5ea6\u3092\u9ad8\u3081\u308b\u3002\u30cb\u30c3\u30b1\u30eb (1.65-2.00%) \u306f\u976d\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u3002\u30af\u30ed\u30e0 (0.70-0.90%) \u306f\u8010\u98df\u6027\u3092\u52a9\u3051\u308b\u3002\u30e2\u30ea\u30d6\u30c7\u30f3 (0.20-0.30%) \u306f\u6469\u8017\u3092\u9632\u304e\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u69cb\u6210\u8868<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u30a8\u30ec\u30e1\u30f3\u30c8<\/strong><\/td><td><strong>\u30d1\u30fc\u30bb\u30f3\u30c8\uff08%\uff09<\/strong><\/td><\/tr><tr><td>\u30ab\u30fc\u30dc\u30f3\uff08C\uff09<\/td><td>0.38-0.43<\/td><\/tr><tr><td>\u30de\u30f3\u30ac\u30f3 (Mn)<\/td><td>0.60-0.80<\/td><\/tr><tr><td>\u30cb\u30c3\u30b1\u30eb\uff08Ni\uff09<\/td><td>1.65-2.00<\/td><\/tr><tr><td>\u30af\u30ed\u30e0\uff08Cr\uff09<\/td><td>0.70-0.90<\/td><\/tr><tr><td>\u30e2\u30ea\u30d6\u30c7\u30f3 (Mo)<\/td><td>0.20-0.30<\/td><\/tr><tr><td>\u30b1\u30a4\u7d20 (Si)<\/td><td>0.15-0.30<\/td><\/tr><tr><td>\u9244\uff08Fe\uff09<\/td><td>\u30d0\u30e9\u30f3\u30b9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u3053\u306e\u914d\u5408\u306b\u3088\u308a\u3001\u51e6\u7406\u5f8c\u306e\u5f15\u5f35\u5f37\u5ea6\u306f\u7d04125,000psi\u3068\u306a\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4340\u92fc\u306e\u4e3b\u306a\u7279\u6027<\/strong><\/h2>\n\n\n\n<p>4340\u306f\u6a5f\u68b0\u7684\u8a66\u9a13\u3067\u8f1d\u304f\u3002\u5fdc\u529b\u4e0b\u3067\u3082\u7834\u65ad\u3057\u306b\u304f\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u7269\u7406\u7684\u6027\u8cea<\/strong><\/h3>\n\n\n\n<p>\u5bc6\u5ea6\u306f0.284 lb\/in\u00b3\u3002\u878d\u70b9\u306f2,600\u00b0F\u3002\u5f37\u78c1\u6027\u306a\u306e\u3067\u78c1\u77f3\u304c\u304f\u3063\u3064\u304f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u6a5f\u68b0\u7684\u7279\u6027<\/strong><\/h3>\n\n\n\n<p>\u964d\u4f0f\u5f37\u5ea6\u306f125,000psi\u306b\u9054\u3059\u308b\u3002\u786c\u5ea6\u306f\u713c\u304d\u306a\u307e\u3057\u72b6\u614b\u3067\u30ed\u30c3\u30af\u30a6\u30a7\u30ebB 100\u3002\u9577\u5bff\u547d\u90e8\u54c1\u306e\u305f\u3081\u306e\u512a\u308c\u305f\u8010\u75b2\u52b4\u6027\u3092\u6301\u3064\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u30d7\u30ed\u30d1\u30c6\u30a3\u8868<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u30d7\u30ed\u30d1\u30c6\u30a3<\/strong><\/td><td><strong>\u4fa1\u5024<\/strong><\/td><\/tr><tr><td>\u5bc6\u5ea6<\/td><td>0.284 lb\/in\u00b3<\/td><\/tr><tr><td>\u964d\u4f0f\u5f37\u5ea6<\/td><td>125,000 psi<\/td><\/tr><tr><td>\u5f15\u5f35\u5f37\u5ea6<\/td><td>150,000-280,000 psi<\/td><\/tr><tr><td>\u786c\u5ea6\uff08\u30ed\u30c3\u30af\u30a6\u30a7\u30eb\uff09<\/td><td>B 100\uff08\u30a2\u30cb\u30fc\u30eb\u51e6\u7406\uff09<\/td><\/tr><tr><td>\u71b1\u4f1d\u5c0e\u7387<\/td><td>309 Btu\u30fbin\/hr\u30fbft\u00b2\u30fb\u00b0F<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u7279\u5fb4\u306f\u3001\u9ad8\u8ca0\u8377\u306e\u4f5c\u696d\u306b\u7406\u60f3\u7684\u3067\u3042\u308b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/leweiprecision.com\/wp-content\/uploads\/2026\/01\/AISI-4340-bright-steel-bar.jpg\" alt=\"4340\u92fc\u306e\u4e3b\u306a\u7279\u6027\" class=\"wp-image-28114\" style=\"width:800px;height:auto\" srcset=\"https:\/\/leweiprecision.com\/wp-content\/uploads\/2026\/01\/AISI-4340-bright-steel-bar.jpg 600w, https:\/\/leweiprecision.com\/wp-content\/uploads\/2026\/01\/AISI-4340-bright-steel-bar-300x200.jpg 300w, https:\/\/leweiprecision.com\/wp-content\/uploads\/2026\/01\/AISI-4340-bright-steel-bar-18x12.jpg 18w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4340\u92fc\u306f\u3069\u306e\u3088\u3046\u306b\u3057\u3066\u4f5c\u3089\u308c\u308b\u306e\u304b\uff1f<\/strong><\/h2>\n\n\n\n<p>4340\u306e\u88fd\u9020\u306f\u3001\u539f\u6599\u306e\u6eb6\u89e3\u304b\u3089\u59cb\u307e\u308b\u3002 <strong><a href=\"https:\/\/leweiprecision.com\/ja\/%e6%9d%90%e6%96%99\/\">\u6750\u6599<\/a><\/strong>.\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u306f\u7d14\u5ea6\u3092\u4fdd\u8a3c\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u30b9\u30c6\u30c3\u30d7\u30fb\u30d0\u30a4\u30fb\u30b9\u30c6\u30c3\u30d7\u306e\u88fd\u9020\u5de5\u7a0b<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u9244\u3068\u5408\u91d1\u3092\u96fb\u6c17\u7089\u3067\u6700\u592712\u6642\u9593\u6eb6\u304b\u3059\u3002<\/li>\n\n\n\n<li>\u771f\u7a7a\u8131\u70ad\u9178\u3067\u30ab\u30fc\u30dc\u30f3\u3092\u6291\u5236\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u304b\u304d\u6df7\u305c\u3066\u51b7\u3084\u3057\u3001\u30d3\u30ec\u30c3\u30c8\u306b\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u71b1\u9593\u307e\u305f\u306f\u51b7\u9593\u30ed\u30fc\u30eb\u3067\u6210\u5f62\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u6700\u7d42\u7684\u306a\u7279\u6027\u3092\u5f97\u308b\u305f\u3081\u306b\u71b1\u51e6\u7406\u3092\u884c\u3046\u3002<\/li>\n\n\n\n<li>\u30ab\u30c3\u30c8\u3068\u4ed5\u4e0a\u3052\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u5f37\u976d\u3067\u5747\u4e00\u306a\u92fc\u9244\u304c\u751f\u307e\u308c\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u4e00\u822c\u7684\u306a\u5f62\u72b6\u3068\u71b1\u51e6\u7406<\/strong><\/h2>\n\n\n\n<p>4340\u306b\u306f\u69d8\u3005\u306a\u5f62\u72b6\u304c\u3042\u308b\u3002\u51e6\u7406\u306b\u3088\u3063\u3066\u7279\u6027\u304c\u5909\u308f\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5229\u7528\u53ef\u80fd\u306a\u30d5\u30a9\u30fc\u30e0<\/strong><\/h3>\n\n\n\n<p>\u677f\uff08\u539a\u30550.018\uff5e0.25\u30a4\u30f3\u30c1\uff09\u3001\u68d2\u3001\u677f\u3068\u3057\u3066\u5165\u624b\u3067\u304d\u308b\u3002\u976d\u6027\u306e\u305f\u3081\u306b\u71b1\u9593\u5727\u5ef6\u3055\u308c\u3001\u5f37\u5ea6\u306e\u305f\u3081\u306b\u51b7\u9593\u5f15\u304d\u629c\u304b\u308c\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u71b1\u51e6\u7406\u304c\u91cd\u8981\u306a\u7406\u7531<\/strong><\/h3>\n\n\n\n<p>\u786c\u5ea6\u3092\u9ad8\u3081\u308b\u3002\u30a2\u30cb\u30fc\u30eb\u51e6\u7406\u306b\u3088\u308a\u6a5f\u68b0\u52a0\u5de5\u304c\u5bb9\u6613\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4340\u92fc\u3092\u4f7f\u7528\u3059\u308b\u7528\u9014\u3068\u7523\u696d<\/strong><\/h2>\n\n\n\n<p>4340\u306f\u3001\u5f37\u5ea6\u304c\u91cd\u8981\u306a\u90e8\u5206\u306b\u9069\u5408\u3059\u308b\u3002\u53b3\u3057\u3044\u74b0\u5883\u3067\u306f\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u30c8\u30c3\u30d7\u7523\u696d<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u822a\u7a7a\u5b87\u5b99\u7523\u696d\uff1a\u30dc\u30fc\u30a4\u30f3\u30b0\u30fb\u30b8\u30a7\u30c3\u30c8\u6a5f\u306a\u3069\u306e\u7740\u9678\u88c5\u7f6e\u3068\u30b7\u30e3\u30d5\u30c8\u3002<\/li>\n\n\n\n<li>\u81ea\u52d5\u8eca\u7523\u696d\uff1a\u30c8\u30e9\u30c3\u30af\u7528\u30af\u30e9\u30f3\u30af\u30b7\u30e3\u30d5\u30c8\u3068\u30a2\u30af\u30b9\u30eb\u3002<\/li>\n\n\n\n<li>\u77f3\u6cb9\u30fb\u30ac\u30b9\u7523\u696d\u30c9\u30ea\u30eb\u30ab\u30e9\u30fc\u3068\u30dd\u30f3\u30d7<\/li>\n\n\n\n<li>\u9632\u885b\uff1a\u9283\u8eab\u3068\u8eca\u4e21\u90e8\u54c1\u3002<\/li>\n\n\n\n<li>\u88fd\u9020\uff1a\u30ae\u30a2\u3068\u30d5\u30a1\u30b9\u30ca\u30fc<\/li>\n<\/ul>\n\n\n\n<p>2025\u5e74\u306b\u306f\u3001\u3053\u308c\u3089\u306e\u30bb\u30af\u30bf\u30fc\u306e\u9244\u92fc\u9700\u8981\u306f\u5e74\u95935.9%\u5897\u52a0\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5b9f\u4f8b<\/strong><\/h3>\n\n\n\n<p>\u30dc\u30fc\u30a4\u30f3\u30b0\u306f\u822a\u7a7a\u6a5f\u90e8\u54c1\u306b\u4f7f\u7528\u3002\u30d5\u30a9\u30fc\u30c9\u306f\u9ad8\u6027\u80fd\u30a8\u30f3\u30b8\u30f3\u306b\u4f7f\u7528\u3057\u3066\u3044\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4340\u92fc\u306e\u9577\u6240\u3068\u77ed\u6240<\/strong><\/h2>\n\n\n\n<p>\u9078\u3076\u524d\u306b\u9577\u6240\u3068\u77ed\u6240\u3092\u5929\u79e4\u306b\u304b\u3051\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u9577\u6240<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7e70\u308a\u8fd4\u3057\u5fdc\u529b\u306b\u5bfe\u3059\u308b\u9ad8\u3044\u8010\u75b2\u52b4\u6027\u3002<\/li>\n\n\n\n<li>\u512a\u308c\u305f\u8010\u885d\u6483\u6027\u3068\u885d\u6483\u5f37\u5ea6\u3002<\/li>\n\n\n\n<li>\u8010\u6469\u8017\u6027\u304c\u826f\u3044\u3002<\/li>\n\n\n\n<li>\u71b1\u51e6\u7406\u306b\u4e07\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u77ed\u6240<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c6\u30a3\u30f3\u30b0\u306a\u3057\u3067\u306f\u8010\u98df\u6027\u306b\u52a3\u308b\u3002<\/li>\n\n\n\n<li>\u8edf\u92fc\u3088\u308a\u3082\u6a5f\u68b0\u52a0\u5de5\u304c\u96e3\u3057\u3044\u3002<\/li>\n\n\n\n<li>\u3044\u304f\u3064\u304b\u306e\u5408\u91d1\u3088\u308a\u91cd\u3044\u3002<\/li>\n\n\n\n<li>\u713c\u304d\u5165\u308c\u3092\u8aa4\u308b\u3068\u30af\u30e9\u30c3\u30af\u304c\u5165\u308b\u5371\u967a\u6027\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4340\u92fc\u306e\u52a0\u5de5\uff1aCNC\u52a0\u5de5\u3092\u6210\u529f\u3055\u305b\u308b\u305f\u3081\u306e\u30d2\u30f3\u30c8<\/strong><\/h2>\n\n\n\n<p>4340\u306e\u52a0\u5de5\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3060\u3002\u305d\u306e\u786c\u3055\u306f\u5de5\u5177\u3092\u6469\u8017\u3055\u305b\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>CNC\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/strong><\/h3>\n\n\n\n<p>\u9577\u6301\u3061\u3055\u305b\u308b\u305f\u3081\u306b\u8d85\u786c\u5de5\u5177\u3092\u4f7f\u7528\u3059\u308b\u3002\u5207\u524a\u901f\u5ea6\u306f710\uff5e950SFM\u306b\u4fdd\u3064\u3002 <strong><a href=\"https:\/\/leweiprecision.com\/ja\/%e3%82%b5%e3%83%bc%e3%83%93%e3%82%b9\/cnc%e6%97%8b%e7%9b%a4\/\">\u56de\u8ee2<\/a><\/strong>.\u52a0\u5de5\u786c\u5316\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u30af\u30fc\u30e9\u30f3\u30c8\u3092\u5857\u5e03\u3059\u308b\u3002<\/p>\n\n\n\n<p><strong>\u30d7\u30ed\u306e\u30a2\u30c9\u30d0\u30a4\u30b9<\/strong> \u307e\u305a\u30e9\u30d5\u30ab\u30c3\u30c8\u3057\u3001\u6b21\u306b\u6b6a\u307f\u3092\u9632\u3050\u305f\u3081\u306b\u4ed5\u4e0a\u3052\u3092\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u907f\u3051\u308b\u3079\u304d\u4e00\u822c\u7684\u306a\u9593\u9055\u3044<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30af\u30fc\u30e9\u30f3\u30c8\u3092\u98db\u3070\u3059 - \u5de5\u5177\u306e\u6469\u8017\u306b\u3064\u306a\u304c\u308b\u3002<\/li>\n\n\n\n<li>\u9ad8\u901f - \u8868\u9762\u3092\u786c\u5316\u3055\u305b\u308b\u3002<\/li>\n\n\n\n<li>\u920d\u3044\u5de5\u5177 - \u8352\u3044\u4ed5\u4e0a\u304c\u308a\u306b\u306a\u308b\u3002<\/li>\n\n\n\n<li>\u30b9\u30c8\u30ec\u30b9\u89e3\u6d88\u3092\u7121\u8996 - \u30d1\u30fc\u30c4\u304c\u3086\u304c\u3080\u3002<\/li>\n\n\n\n<li>\u30d1\u30b9\u3068\u30d1\u30b9\u306e\u9593\u306b\u518d\u8868\u793a\u304c\u306a\u304f\u3001\u7cbe\u5ea6\u304c\u843d\u3061\u308b\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u30b9\u30e0\u30fc\u30ba\u306a\u7d50\u679c\u3092\u5f97\u308b\u305f\u3081\u306b\u3001\u3053\u308c\u3089\u306b\u5f93\u3046\u3053\u3068\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4340\u92fc\u306e\u30b9\u30c6\u30c3\u30d7\u30fb\u30d0\u30a4\u30fb\u30b9\u30c6\u30c3\u30d7\u71b1\u51e6\u7406\u65b9\u6cd5<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u30d7\u30ed\u30bb\u30b9\u306e\u8aac\u660e<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b9\u30c8\u30ec\u30b9\u3092\u6e1b\u3089\u3059\u305f\u3081\u306b500\uff5e550\u2103\u306b\u4e88\u71b1\u3059\u308b\u3002<\/li>\n\n\n\n<li>790\uff5e915\u2103\u30671\uff5e2\u6642\u9593\u30aa\u30fc\u30b9\u30c6\u30ca\u30a4\u30c8\u5316\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u30aa\u30a4\u30eb\u307e\u305f\u306f\u7a7a\u6c17\u4e2d\u3067\u6025\u51b7\u3059\u308b\u3002<\/li>\n\n\n\n<li>450\uff5e650\u2103\u3067\u976d\u6027\u3092\u9ad8\u3081\u308b\u3002<\/li>\n\n\n\n<li>\u7a7a\u6c17\u306f\u51b7\u305f\u3044\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u30d0\u30e9\u30f3\u30b9\u306e\u3068\u308c\u305f\u5f37\u5ea6\u3068\u5ef6\u6027\u304c\u5f97\u3089\u308c\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4340\u92fc\u3068\u4ed6\u306e\u5408\u91d1\u306e\u6bd4\u8f03<\/strong><\/h2>\n\n\n\n<p>\u3092\u304a\u63a2\u3057\u306a\u3089 <strong><a href=\"https:\/\/leweiprecision.com\/ja\/%e3%82%b5%e3%83%bc%e3%83%93%e3%82%b9\/%e7%b2%be%e5%af%86%e5%8a%a0%e5%b7%a5\/\">\u7cbe\u5bc6\u6a5f\u68b0\u52a0\u5de5\u30b5\u30fc\u30d3\u30b9<\/a><\/strong> \u69d8\u3005\u306a\u5408\u91d1\u3092\u6271\u3046\u3001 <strong>4340\u30b9\u30c1\u30fc\u30eb<\/strong> \u306e\u3088\u3046\u306a\u4ed6\u306e\u92fc\u306b\u6bd4\u3079\u3001\u305d\u306e\u976d\u6027\u3067\u969b\u7acb\u3063\u3066\u3044\u308b\u3002 <strong>4140<\/strong> \u307e\u305f\u306f <strong>4330<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5bfe4140\u92fc<\/strong><\/h3>\n\n\n\n<p>4340\u306f\u30cb\u30c3\u30b1\u30eb\u304c\u591a\u304f\u976d\u6027\u304c\u9ad8\u3044\u30024140\u306f\u5b89\u4fa1\u3060\u304c\u3001\u539a\u3044\u90e8\u54c1\u3067\u306f\u5f37\u5ea6\u304c\u52a3\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5bfe4330\u92fc<\/strong><\/h3>\n\n\n\n<p>4330\u306f\u5f37\u5ea6\u304c\u9ad8\u3044\u304c\u3001\u30b3\u30b9\u30c8\u304c\u9ad8\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u6bd4\u8f03\u8868<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u5408\u91d1<\/strong><\/td><td><strong>\u5f37\u5ea6\uff08psi\uff09<\/strong><\/td><td><strong>\u30bf\u30d5\u30cd\u30b9<\/strong><\/td><td><strong>\u30b3\u30b9\u30c8<\/strong><\/td><\/tr><tr><td>4340<\/td><td>125,000<\/td><td>\u9ad8\u3044<\/td><td>\u30df\u30c7\u30a3\u30a2\u30e0<\/td><\/tr><tr><td>4140<\/td><td>95,000<\/td><td>\u30df\u30c7\u30a3\u30a2\u30e0<\/td><td>\u4f4e\u3044<\/td><\/tr><tr><td>4330<\/td><td>140,000<\/td><td>\u9ad8\u3044<\/td><td>\u9ad8\u3044<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u30cb\u30fc\u30ba\u306b\u5408\u308f\u305b\u3066\u9078\u3076<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b4340\u92fc\u3092\u9078\u3076\u306b\u306f<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"687\" src=\"https:\/\/leweiprecision.com\/wp-content\/uploads\/2026\/01\/69efdae9-e94c-4805-afda-3cbf3d2eb117-1024x687.jpg\" alt=\"\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b4340\u92fc\u3092\u9078\u3076\u306b\u306f\" class=\"wp-image-28115\" srcset=\"https:\/\/leweiprecision.com\/wp-content\/uploads\/2026\/01\/69efdae9-e94c-4805-afda-3cbf3d2eb117-1024x687.jpg 1024w, https:\/\/leweiprecision.com\/wp-content\/uploads\/2026\/01\/69efdae9-e94c-4805-afda-3cbf3d2eb117-300x201.jpg 300w, https:\/\/leweiprecision.com\/wp-content\/uploads\/2026\/01\/69efdae9-e94c-4805-afda-3cbf3d2eb117-768x516.jpg 768w, https:\/\/leweiprecision.com\/wp-content\/uploads\/2026\/01\/69efdae9-e94c-4805-afda-3cbf3d2eb117-18x12.jpg 18w, https:\/\/leweiprecision.com\/wp-content\/uploads\/2026\/01\/69efdae9-e94c-4805-afda-3cbf3d2eb117.jpg 1168w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u8003\u616e\u3059\u3079\u304d\u8981\u7d20<\/strong><\/h3>\n\n\n\n<p>\u8ca0\u8377\u8981\u4ef6\u3092\u30c1\u30a7\u30c3\u30af\u9ad8\u3044\u75b2\u52b4\u304c\u5fc5\u8981\u304b\uff1f4340\u3092\u9078\u3076\u3002\u4e88\u7b97\u304c\u53b3\u3057\u3044\uff1f\u4ee3\u66ff\u54c1\u3092\u691c\u8a0e\u3059\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u30af\u30a4\u30c3\u30af\u30fb\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u30fb\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u3042\u306a\u305f\u306e\u30d1\u30fc\u30c8\u306f\u5927\u304d\u306a\u30b9\u30c8\u30ec\u30b9\u306b\u76f4\u9762\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/li>\n\n\n\n<li>\u6df1\u3044\u786c\u5316\u304c\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/li>\n\n\n\n<li>\u6a5f\u68b0\u52a0\u5de5\u306e\u4e88\u7b97\u306f\uff1f<\/li>\n\n\n\n<li>\u8150\u98df\u304c\u5fc3\u914d\uff1f\u30b3\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u52a0\u3048\u308b\u3002<\/li>\n\n\n\n<li>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30b5\u30a4\u30ba\uff1a\u539a\u3044\u90e8\u5206\u304c\u52b9\u679c\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u306f\u8ce2\u660e\u306a\u6c7a\u65ad\u306b\u5f79\u7acb\u3064\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4340\u92fc\u306e\u30b3\u30b9\u30c8\u306b\u95a2\u3059\u308b\u8003\u5bdf<\/strong><\/h2>\n\n\n\n<p>\u8cbb\u7528\u306f\u5f62\u614b\u3084\u91cf\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u7d4c\u8cbb\u306e\u5185\u8a33<\/strong><\/h3>\n\n\n\n<p>\u539f\u6750\u6599\uff1a2025\u5e74\u306b\u306f1\u30dd\u30f3\u30c9\u5f53\u305f\u308a$1-2\u3002\u6a5f\u68b0\u52a0\u5de5\u306f1\u30dd\u30f3\u30c9\u3042\u305f\u308a$0.50-1\u8ffd\u52a0\u3002\u71b1\u51e6\u7406\uff1a$0.20-0.50\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4fa1\u683c\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u8981\u56e0<\/strong><\/h3>\n\n\n\n<p>\u30dc\u30ea\u30e5\u30fc\u30e0\u30fb\u30c7\u30a3\u30b9\u30ab\u30a6\u30f3\u30c8\u306f\u30b3\u30b9\u30c8\u3092\u4e0b\u3052\u308b\u3002\u51b7\u5ef6\u306f\u71b1\u5ef6\u3088\u308a\u3082\u4fa1\u683c\u304c\u9ad8\u3044\u30022025 \u5e74\u306e\u5408\u91d1\u30b5\u30fc\u30c1\u30e3\u30fc\u30b8\u306f\u30dd\u30f3\u30c9\u5f53\u305f\u308a\u5e73\u5747 $0.46\uff5e0.54 \u3067\u3042\u308b\u3002<\/p>\n\n\n\n<p>[\u30a4\u30f3\u30d5\u30a9\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u63d0\u6848\uff1a4340\u30d5\u30a9\u30fc\u30e0\u306e\u30b3\u30b9\u30c8\u6bd4\u8f03\u8868].<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u8981\u70b9<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>4340\u92fc\u306f\u3001\u8981\u6c42\u306e\u53b3\u3057\u3044\u7528\u9014\u306b\u9ad8\u3044\u5f37\u5ea6\u3068\u976d\u6027\u3092\u63d0\u4f9b\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u4e3b\u306a\u7d44\u62100.38-0.43%\u30ab\u30fc\u30dc\u30f3\u30011.65-2%\u30cb\u30c3\u30b1\u30eb\u3002<\/li>\n\n\n\n<li>\u822a\u7a7a\u5b87\u5b99\u3001\u81ea\u52d5\u8eca\u3001\u77f3\u6cb9\u30fb\u30ac\u30b9\u7523\u696d\u306b\u6700\u9069\u3002<\/li>\n\n\n\n<li>\u554f\u984c\u3092\u907f\u3051\u308b\u305f\u3081\u3001\u8d85\u786c\u5de5\u5177\u3068\u30af\u30fc\u30e9\u30f3\u30c8\u3067\u52a0\u5de5\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u6700\u9069\u306a\u7279\u6027\u3092\u5f97\u308b\u305f\u3081\u306b\u9069\u5207\u306a\u71b1\u51e6\u7406\u3092\u884c\u3046\u3002<\/li>\n\n\n\n<li>\u30b3\u30b9\u30c8\u306f1\u30dd\u30f3\u30c9\u3042\u305f\u308a$1-2\u3002<\/li>\n\n\n\n<li>\u8010\u75b2\u52b4\u6027\u304c\u5fc5\u8981\u306a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u9078\u629e\u3059\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u7d50\u8ad6<\/strong><\/h2>\n\n\n\n<p>4340\u92fc\u306f\u91cd\u8981\u306a\u90e8\u54c1\u306b\u6700\u9ad8\u306e\u5f37\u5ea6\u3092\u63d0\u4f9b\u3057\u307e\u3059\u30024340\u92fc\u306e\u7279\u6027\u3001\u7528\u9014\u3001\u52a0\u5de5\u4e0a\u306e\u30d2\u30f3\u30c8\u3092\u3054\u89a7\u306b\u306a\u3063\u305f\u3053\u3068\u3067\u3057\u3087\u3046\u30024340\u92fc\u306f\u3001\u822a\u7a7a\u5b87\u5b99\u7523\u696d\u3084\u81ea\u52d5\u8eca\u7523\u696d\u306a\u3069\u306e\u904e\u9177\u306a\u5206\u91ce\u3067\u512a\u308c\u305f\u6027\u80fd\u3092\u767a\u63ee\u3057\u307e\u3059\u3002\u6700\u826f\u306e\u7d50\u679c\u3092\u5f97\u308b\u305f\u3081\u306b\u306f\u3001\u71b1\u51e6\u7406\u3068\u6a5f\u68b0\u52a0\u5de5\u3092\u614e\u91cd\u306b\u884c\u3046\u3053\u3068\u3092\u5fd8\u308c\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u77e5\u8b58\u304c\u3042\u308c\u3070\u3001\u81ea\u4fe1\u3092\u6301\u3063\u3066\u6b63\u3057\u3044\u6750\u6599\u3092\u9078\u3076\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u30024340\u92fc\u306eCNC\u6a5f\u68b0\u52a0\u5de5\u30b5\u30fc\u30d3\u30b9\u3067\u5c02\u9580\u5bb6\u306e\u52a9\u3051\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u30ac\u30a4\u30c0\u30f3\u30b9\u306e\u305f\u3081\u306b\u79c1\u305f\u3061\u306e\u30c1\u30fc\u30e0\u306b\u9023\u7d61\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u304a\u5ba2\u69d8\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u30b5\u30dd\u30fc\u30c8\u3044\u305f\u3057\u307e\u3059\u3002<strong><br><\/strong><strong><br><\/strong><strong><br><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f<br><\/h2>\n\n\n\n<div class=\"wp-block-wpseopress-faq-block-v2 is-layout-flow wp-block-faq-block-v2-is-layout-flow\">\n<details id=\"what-makes-4340-steel-different-from-4140\" class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>4340\u306f4140\u3068\u4f55\u304c\u9055\u3046\u306e\u3067\u3059\u304b\uff1f<\/strong><\/summary>\n<p>4340\u306f\u30cb\u30c3\u30b1\u30eb\u3068\u70ad\u7d20\u304c\u591a\u304f\u3001\u5927\u578b\u90e8\u54c1\u306e\u976d\u6027\u3068\u5f37\u5ea6\u306b\u512a\u308c\u3066\u3044\u308b\u3002\u9ad8\u8ca0\u8377\u306e\u304b\u304b\u308b\u4f5c\u696d\u306b\u7406\u60f3\u7684\u3067\u30014140\u306f\u3088\u308a\u30de\u30a4\u30eb\u30c9\u306a\u7528\u9014\u306b\u4f4e\u30b3\u30b9\u30c8\u3067\u9069\u3057\u3066\u3044\u308b\u3002<\/p>\n<\/details>\n\n\n\n<details id=\"is-4340-steel-corrosion-resistant\" class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>4340\u92fc\u306f\u8010\u98df\u6027\u306b\u512a\u308c\u3066\u3044\u308b\u304b\uff1f<\/strong><\/summary>\n<p>\u3044\u3084\u3001\u4fdd\u8b77\u3057\u306a\u3044\u3068\u7c21\u5358\u306b\u9306\u3073\u308b\u3002\u6fe1\u308c\u305f\u74b0\u5883\u3067\u306f\u3001\u30da\u30f3\u30ad\u3084\u30af\u30ed\u30fc\u30e0\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u52a0\u3048\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5c4b\u5916\u3067\u306e\u4f7f\u7528\u5bff\u547d\u304c\u5ef6\u3073\u307e\u3059\u3002<\/p>\n<\/details>\n\n\n\n<details id=\"can-i-weld-4340-steel\" class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>4340\u92fc\u306e\u6eb6\u63a5\u306f\u53ef\u80fd\u304b\uff1f<\/strong><\/summary>\n<p>\u3057\u304b\u3057\u3001500\u00b0F\u306b\u4e88\u71b1\u3057\u3001\u4f4e\u6c34\u7d20 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wp-block-details-is-layout-flow\"><summary><strong>\u71b1\u51e6\u7406\u304c4340\u306b\u4e0e\u3048\u308b\u5f71\u97ff\u306f\uff1f<\/strong><\/summary>\n<p>\u305d\u308c\u306f\u5f37\u5ea6\u3068\u976d\u6027\u3092\u9ad8\u3081\u308b\u3002\u9069\u5207\u306a\u624b\u9806\u3092\u8e0f\u3080\u3053\u3068\u3067\u3001\u8106\u3055\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u90e8\u54c1\u306b\u6700\u826f\u306e\u7d50\u679c\u3092\u3082\u305f\u3089\u3059\u305f\u3081\u306b\u3001\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u306b\u5f93\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/details>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"url\":\"https:\/\/leweiprecision.com\/4340-steel-your-complete-guide-to-properties-applications-and-machining\/\",\"@id\":\"https:\/\/leweiprecision.com\/4340-steel-your-complete-guide-to-properties-applications-and-machining\/\",\"mainEntity\":[{\"@type\":\"Question\",\"url\":\"https:\/\/leweiprecision.com\/4340-steel-your-complete-guide-to-properties-applications-and-machining\/#what-makes-4340-steel-different-from-4140\",\"name\":\"What makes 4340 steel different from 4140?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"&lt;p>4340 has more nickel and carbon for better toughness and strength in large parts. It's ideal for high-stress jobs, while 4140 suits milder uses at lower cost.&lt;\/p>\"}},{\"@type\":\"Question\",\"url\":\"https:\/\/leweiprecision.com\/4340-steel-your-complete-guide-to-properties-applications-and-machining\/#is-4340-steel-corrosion-resistant\",\"name\":\"Is 4340 steel corrosion-resistant?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"&lt;p>No, it rusts easily without protection. Add coatings like paint or chrome for wet environments. This extends life in outdoor applications.&lt;\/p>\"}},{\"@type\":\"Question\",\"url\":\"https:\/\/leweiprecision.com\/4340-steel-your-complete-guide-to-properties-applications-and-machining\/#can-i-weld-4340-steel\",\"name\":\"Can I weld 4340 steel?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"&lt;p>Yes, but preheat to 500\u00b0F and use low-hydrogen rods. Post-weld heat treatment prevents cracks. Always test small pieces first.&lt;\/p>\"}},{\"@type\":\"Question\",\"url\":\"https:\/\/leweiprecision.com\/4340-steel-your-complete-guide-to-properties-applications-and-machining\/#what-hardness-can-4340-reach\",\"name\":\"What hardness can 4340 reach?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"&lt;p>Up to Rockwell C 50 after quenching and tempering. Annealed, it's around B 100 for easy machining.&lt;\/p>\"}},{\"@type\":\"Question\",\"url\":\"https:\/\/leweiprecision.com\/4340-steel-your-complete-guide-to-properties-applications-and-machining\/#how-does-heat-treatment-affect-4340\",\"name\":\"How does heat treatment affect 4340?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"&lt;p>It increases strength and toughness. Proper steps avoid brittleness. Follow guidelines for best results in your parts.&lt;\/p>\"}}]}<\/script><\/div>","protected":false},"excerpt":{"rendered":"<p>Introduction Are you building parts that must handle extreme stress without breaking? 4340 steel might be your answer. This high-strength alloy stands up to tough jobs in planes, cars, and machines. In this guide, you&#8217;ll learn its makeup, key traits, and how to use it right. You&#8217;ll see why it&#8217;s a top pick for strength and toughness. We&#8217;ll cover machining tips, especially for CNC machining service 4340 steel, to help you avoid common pitfalls. Plus, get advice on costs and choices for your projects. By the end, you&#8217;ll know if 4340 fits your needs. This matters because picking the right steel saves time and money while boosting safety. For example, [&hellip;]<\/p>","protected":false},"author":1,"featured_media":28113,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"4340 Steel: Properties, Uses & Machining Guide","_seopress_titles_desc":"Explore 4340 steel\u2019s composition, strength, uses, and CNC machining tips. 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