{"id":794,"date":"2026-06-01T10:13:00","date_gmt":"2026-06-01T10:13:00","guid":{"rendered":"https:\/\/www.wudejiansteel.com\/?p=794"},"modified":"2026-06-01T10:13:01","modified_gmt":"2026-06-01T10:13:01","slug":"when-punching-nine-5mm-holes-in-stainless-steel-the-skh51-and-m42-punches-actually-broke-but-the-press-operator-still-wants-to-use-high-hardness-die-steel-blog-145","status":"publish","type":"post","link":"https:\/\/www.wudejiansteel.com\/?p=794","title":{"rendered":"When punching nine 5mm holes in stainless steel, the SKH51 and M42 punches actually broke, but the press operator still wants to use high-hardness die steel.blog\u00a0145"},"content":{"rendered":"\n

When selecting stamping die steel<\/a><\/strong>, many people worry that the steel\u2019s hardness is too low and its wear resistance insufficient. Even though the primary cause of die failure is chipping, they still worry that low-hardness die steel<\/strong>\u00a0lacks sufficient wear resistance. This is worrying about wear resistance when they shouldn\u2019t be, while neglecting the toughness they actually should be concerned about.<\/p>\n\n\n\n

 Take the owner of a punch manufacturing plant who came to me today to inquire about 8566 anti-chipping steel. His customer was punching 9.0mm holes in 5mm stainless steel, and he had been using SKH-51 and M42 punches\u2014both of which were prone to breaking, even after increasing their hardness. He heard from his client that 8566 anti-chipping steel has excellent resistance to chipping. He also knows that 8566\u2019s chipping resistance is four times that of high-speed steel SKH-9 and twice that of D2, with a hardness of 58\u201360 HRC. It can solve chipping problems that high-hardness mold steels like D2, DC53, and SKH-9 cannot resolve.<\/p>\n\n\n\n

 He had also heard that 8566 anti-chipping steel works very well for stamping stainless steel, but he was still concerned that with a hardness of 58-60 HRC, and whether it would wear out after producing only a few parts. Although he currently has customers stamping stainless steel who purchase 8566 material from me, and customers who come to him for punch grinding have reported that 8566 performs very well when stamping stainless steel, he begins to worry about 8566\u2019s wear resistance when he has to pay for it himself.<\/p>\n\n\n\n

 8566 is primarily used for stainless steel stamping, sharp-corner stamping, narrow-edge stamping, and even applications where the hole diameter is smaller than the sheet thickness or the stamping ratio is less than 1:1. It resolves chipping issues that standard die steel<\/strong> cannot handle.<\/p>\n\n\n\n

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Mr. Wang was punching 8.0mm mesh holes in 5mm 304 stainless steel, with 6,000 holes per sheet. He had previously tested punches made from ASP60, ASP30, 3V, and DC53, but they all broke\u2014one after another. He said, \u201cI have to punch 6,000 holes per sheet. If I have to keep swapping out punches, I can\u2019t keep up with production.\u201d However, after switching to punches made from Yuhui 8566, he punched 36,000 holes without any breakage issues.<\/p>\n\n\n\n

 Many of our customers face this situation: when selecting stamping die steel, they focus solely on wear resistance. Even though the failure mode is chipping, they insist on using high-hardness steel. When chipping occurs, they lower the hardness\u2014even after reducing it to 58 HRC, the punch still chips\u2014yet they remain concerned that 8566 steel in the 58\u201360 HRC range might lack sufficient wear resistance. Those who haven\u2019t used 8566 have all sorts of worries, but those who have actually used it know that punch chipping is a common issue. Using 8566 die steel makes all the difference\u2014it\u2019s like night and day.<\/p>\n\n\n\n

 You\u2019re punching 9 holes in 5mm stainless steel\u2014this is thick, hard-material stamping, which generates significant vibration. High-speed steel with excellent wear resistance is too brittle; the punch will shatter from the vibration. This is a material selection error. For thick, hard-material stamping, the punch must prioritize crack resistance; a hardness of 58\u201360 HRC is actually sufficient. If you let the punch wear down naturally, it will still be capable of producing many parts. Its service life will definitely be longer than that of your current high-wear-resistant SKH51 or M42 punches. Mr. Wang has already verified this\u2014the punch remained intact after 36,000 strokes. Therefore, I still recommend using 8566 anti-fracture steel for your punches.<\/p>\n\n\n\n

When punching stainless steel and the punch head fractures, using 8566 die steel<\/a><\/strong>\u00a0makes all the difference.<\/p>\n\n\n\n

 *************<\/p>\n\n\n\n

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

When selecting stamping die steel, many people worry that the steel\u2019s hardness is too low and its wear resistance insufficient. Even though the primary cause of die failure is chipping, they still worry that low-hardness die steel\u00a0lacks sufficient wear resistance. This is worrying about wear resistance when they shouldn\u2019t be, while neglecting the toughness they […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-794","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