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<\/figure>\n\n\n\n8566 is a proprietary crack-resistant steel developed by\u00a0Yuhui Mold Steel<\/a><\/strong>, specifically designed to prevent mold cracking. It has accumulated over a thousand case studies across 5 stamping conditions, 6 major material types, and 7 major industries. The crack resistance of 8566 is 4 times that of\u00a0high-speed steel SKH-9<\/strong>\u00a0and 2 times that of D2, with a hardness of 58\u201360 HRC. It primarily solves cracking issues that high-hardness mold steels such as D2, DC53, and SKH-9 cannot resolve. In particular, 8566 is used to solve chipping problems in stainless steel stamping, sharp-corner stamping, narrow-flange stamping, and thick-sheet stamping\u2014even in narrow-flange conditions where the punch width is less than the sheet thickness and the stamping ratio is less than 1:1.<\/p>\n\n\n\n Due to its high market visibility, strong sales, and customers specifically requesting it, 8566 has attracted widespread imitation across the industry. Not only are there direct copies of 8566, but also \u201cshadow\u201d versions of 8566, and it has even become a reference standard for certain major steel mills. This is an unprecedented and bizarre phenomenon within the industry.<\/p>\n\n\n\n After the live stream ended, he left me a message on WeChat and sent me a photo. His product had six sharp corners, and the corners were quite pointed. However, his material was only 3 mm thick\u2014a relatively thin 45 steel blank that isn\u2019t particularly hard. The 8566 anti-chipping steel shouldn\u2019t have caused the corners to chip so quickly, so I concluded that he had purchased a counterfeit version of 8566.<\/p>\n\n\n\n Moreover, he added me on WeChat back in 2019. I\u2019ve posted over 2,400 videos since then, so he must have watched them and known that 8566 is a Yuhui proprietary product. Yet the 8566 he\u2019s using now causes the tips to chip after just 1,000 stamped parts\u2014a problem so frequent it\u2019s driving him crazy. This is undoubtedly the result of using counterfeit 8566 steel.<\/p>\n\n\n\n Mr. He was precision stamping 7mm 45 steel gears in a single step. The precision stamping die requires a fully polished strip with very small clearances, so the demands on the die steel\u2019s crack resistance are higher than for ordinary stamping. His original punch was made of DC53, which could only produce 2,000\u20133,000 parts before cracking by 5\u20136 mm. Later, he switched to LD steel and reduced the hardness, but it could still only produce 5,000 parts, with each fracture resulting in a 2\u20133 mm break.<\/p>\n\n\n\n After Mr. He contacted me, I recommended he use 8566 anti-fracture steel. Now, with 8566, he can produce 25,000 parts\u2014a service life five times longer than that of LD steel.<\/p>\n\n\n\n Mr. He performs single-step fine blanking of 7mm-thick 45 steel gears; using 8566 chipping-resistant steel, he can achieve 25,000 presses. In contrast, when he stamps 3mm-thick 45 steel, the tip corners crack after just 1,000 presses. When comparing the results, the difference is stark.<\/p>\n\n\n\n \u00a0When it comes to punch chipping, using 8566 die steel<\/a><\/strong>\u00a0is like night and day\u2014it won\u2019t give you a headache.<\/p>\n\n\n\n *************<\/p>\n\n\n\n![\"\"](\"https:\/\/www.wudejiansteel.com\/wp-content\/uploads\/2026\/07\/\u7cbe\u51b27mm\u539a45\u94a2\u7684\u9f7f\u8f6e\u5c16\u89d2\u4ea7\u54c1\uff0c8566\u6a21\u5177\u94a2\uff0c\u51ed\u501f\u4f18\u8d8a\u6297\u5d29\u88c2\u6027\u80fd\uff0c\u529b\u538b\u7fa4\u96c4\uff0c\u5b8c\u7f8e\u80dc\u51fa\uff01.jpg\")
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