{"id":1379,"date":"2026-08-12T09:18:49","date_gmt":"2026-08-12T09:18:49","guid":{"rendered":"https:\/\/www.wudejiansteel.com\/?p=1379"},"modified":"2026-08-12T09:18:49","modified_gmt":"2026-08-12T09:18:49","slug":"the-h13-thin-section-insert-one-thing-breaks-then-another-its-giving-me-a-headache-blog-275","status":"publish","type":"post","link":"https:\/\/www.wudejiansteel.com\/?p=1379","title":{"rendered":"The H13\u00a0thin-section insert\u2014one thing breaks, then another\u2014it’s giving me a headache.blog\u00a0275"},"content":{"rendered":"\n

Mr. Lin, whom I haven\u2019t been in touch with for many years, reached out to ask: He currently has a part that\u2019s injection-molded from nylon, and the mold contains multiple cores\u2014four of which are relatively thin. He\u2019s currently using H13<\/a><\/strong> mold steel, but the cores keep breaking after producing only a few parts\u2014sometimes one breaks, then another; sometimes they break shortly after being installed, and other times they break after running for a short while. He\u2019s wondering if there\u2019s a mold steel with higher hardness, better toughness, and greater resistance to breakage.<\/p>\n\n\n\n

  After discussing the matter with him in detail, I learned that he is injection molding nylon. Each mold has multiple interlocking cores, and each core consists of four thin plates. The current H13 steel is unreliable\u2014sometimes it breaks as soon as it\u2019s installed, and one core breaks after another, which is causing a lot of trouble. The cores are machined using slow-wire EDM, which is very expensive. With cores breaking one after another, he\u2019s wasting a lot on machining costs. Constantly replacing them also prevents him from achieving the desired production volume. He\u2019s looking for a mold steel that\u2019s less prone to breaking while also offering higher hardness to improve strength.<\/p>\n\n\n\n

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During the injection molding process, the thin-plate cores are subjected to compression forces from multiple directions. The mold steel must therefore possess both high toughness and high strength; if the toughness is insufficient, it is prone to brittle fracture, and if the strength is too low, it is prone to tearing.<\/p>\n\n\n\n

 H13, S136, 2344, 8407, and even 8418 are all medium-carbon steels with a carbon content of 0.38% and a hardness of 50 HRC. and while they offer good toughness, their strength is too low. When subjected to external compressive forces, they are prone to failure by tearing or shearing. Currently, using H13 results in very few successful products\u2014one part breaks here, another there; some fail after only a short time in production. This consistent instability further confirms that H13 simply lacks the necessary strength for thin-walled cores.<\/p>\n\n\n\n

\u00a0With this type of thin-sheet core, whether you use H13, 2344, SKD61, or even S136 and 8418, they are all prone to breaking\u2014there\u2019s no way to solve this issue. I recommend using high-toughness LG mold steel<\/a><\/strong>.<\/p>\n\n\n\n

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LG is a proprietary high-toughness die steel developed by Yuhui Company. LG\u2019s toughness is 8 to 9 times that of DC53, with a hardness of HRC 54\u201358. It\u2019s so tough that it won\u2019t break even if you bend it by hand.<\/p>\n\n\n\n

 Mr. Yu took a 60mm-high scrap piece of hard LG material left over from wire cutting, bent it 180\u00b0, and it didn\u2019t break. After the force was released, it even sprang back. Mr. Yu said: \u201cLG has both rigidity and toughness. The scraps left over from wire cutting were snapped up by a group of friends to cut small cores on the spot, and they worked very well.\u201d<\/p>\n\n\n\n

With a hardness of 54\u201358 HRC, LG offers significantly higher strength than medium-carbon steels such as H13, S136, and 8407, ensuring high strength. Furthermore, its toughness is 8\u20139 times that of DC53\u2014so tough that it won\u2019t break even if you bend it with a hammer. When making thin, interlocking cores or connector pins, materials like H13, 8407, 8418, and S136 are prone to breaking\u2014problems you simply can\u2019t solve. Try LG mold steel instead\u2014it won\u2019t break even if you bend it.<\/p>\n\n\n\n

 LG is a high-toughness mold steel exclusive to Yuhui Mold Steel. However, due to its high market visibility, strong sales, and customers specifically requesting it, it has attracted widespread imitation across the industry. When purchasing, please pay close attention to the source of the material.<\/p>\n\n\n\n

*************<\/p>\n\n\n\n

Wu Dejian’s\u00a0tool\u00a0steel<\/a><\/strong>, the chief of staff of the user, bought everything he had used.<\/p>\n","protected":false},"excerpt":{"rendered":"

Mr. Lin, whom I haven\u2019t been in touch with for many years, reached out to ask: He currently has a part that\u2019s injection-molded from nylon, and the mold contains multiple cores\u2014four of which are relatively thin. He\u2019s currently using H13 mold steel, but the cores keep breaking after producing only a few parts\u2014sometimes one breaks, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1379","post","type-post","status-publish","format-standard","hentry","category-blog"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t