Author: wudejian
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A live stream titled “Never Use Cr12MoV Tool Steel for Drawing Dies” sparked heated discussion among netizens.blog 177
At the request of my viewers, I went live again. Last night, on June 13, 2026, I streamed for 1 hour and 35 minutes. This was my 295th live stream, nearly three months after my previous one—the 294th live stream on March 20. Once you stop doing something, it’s hard to get back into the…
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For injection molds used with PA66 GF30 glass-fiber-reinforced plastic, if a cycle life of 300,000 cycles is required, a hard mold is sufficient; if a cycle life of 1 million cycles is required, use 8503 mold steel.blog 176
During my 295th live stream, a viewer asked me: “For PA6 reinforced with 30% glass fiber, with a required mold life of 300,000 cycles, what type of mold steel should be used?” 30% glass-fiber-reinforced nylon is a material that causes significant erosion to molds. To withstand the erosion caused by nylon reinforced with 30% glass fiber,…
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What type of die steel is best suited for single-step precision stamping of 8mm S500MC high-strength steel？blog 175
During the 295th live stream, a viewer asked: “What type of die steel is best for single-step precision punching of 8mm-thick S500MC high-strength steel?” Precision stamping 8mm-thick S500MC high-strength steel involves stamping thick, hard material. To ensure a bright edge, the die clearance is very small, and the material is forced in tightly. Since this…
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If you use Cr12MoV tool steel for drawing dies, the material will inevitably stick to the die and cause wire drawing—it’s a waste of money.blog 174
A word of advice to those making drawing dies: stop using Cr12MoV for drawing dies. It will inevitably cause material adhesion and stringing—there’s no fixing it. This afternoon, I received an inquiry from Mr. Liu regarding the drawing of 0.35mm-thick cold-rolled sheet. He is currently using Cr12MoV, and a small die core is sticking to…
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Buying the wrong tool steel wastes both the boss’s money and time.blog 173
This morning, Mr. Shi came to ask about punching 3mm holes in 2mm-thick 304 and 430 stainless steel. He’s currently using ASP23, but it chips easily—the punch typically breaks after about 10,000 punches. He asked me what tool steel he should use for punches designed for stainless steel. ASP23 is a powder-metallurgy high-speed steel that costs…
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Why do mold components warp and crack after heat treatment?blog 172
Mold components or workpieces may sometimes deform or crack after quenching. This is partly due to the workpiece’s shape and dimensions (complex geometry or excessive local dimensional variations). It may also be caused by microstructural inhomogeneities within the workpiece (such as the presence of large inclusions, carbides, or machining cracks); or due to operational factors…
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For stamping 2mm stainless steel, 8566 anti-chipping steel is highly recommended; compared to other die steels, 8566 offers excellent value for money.blog 171
For stamping 2mm stainless steel, I still recommend 8566 anti-chipping steel because it offers excellent value for money. This afternoon, I received inquiries from two customers stamping 2.0mm stainless steel. One had chosen the wrong material—Cr12MoV is prone to chipping—while the other used the very expensive ASP23 material, but it developed burrs at the wear points…
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It’s not about the size of the client, but the quality.blog 170
In business, dealing with difficult customers can lead to a whole host of problems. Just a few days ago, we had a case where we accidentally shipped 8566 chipping-resistant steel (35x100x185) instead of the requested 8503 mold steel (35x100x200). The price difference was only 348 yuan, but once he realized we’d sent the more expensive 8566…
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Yuhui’s high-toughness LG mold steel contains half the impurities of the national standard and is on par with imported steel. blog 169
The final results showed that the impurity levels in Yuhui’s high-toughness LG mold steel were half those of the national standard and on par with imported steel. With that, my worries were finally put to rest, and I felt relieved. Here’s what happened: Last week, I received a “complaint” from Mr. Lan stating that the surface…
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Why is there a 10-fold difference in punch life when punching 3mm pickled sheet metal using punches cut from the same DC53 wire?Post No. 564
Mr. Jin said, “I was rough-blanking 3mm-thick pickled sheet metal. I bought the same piece of DC53 hard steel from Kunshan and used wire-cut dies to make the punches. The first one cracked after punching 20,000 pieces, and now this second one has cracked after only 2,000 pieces. What could be the cause?” Indeed, when punching…
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The higher the hardness of die steel, the better its wear resistance—but this statement comes with a caveat.blog 167
When the hardness of die steel is below 58 HRC, wear resistance increases with increasing hardness; in other words, as we often say, the higher the hardness, the better the wear resistance. However, when the hardness of die steel exceeds 58 HRC, wear resistance is determined by the type and morphology of the carbides. The microstructure…
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I thought that once I found out the grade of the die steel, the problem of the die cracking would be solved, but after three months of struggling, it still wasn’t resolved.blog 166
Some people come to me for advice on die steel, thinking that once they know the grade, their problem is solved. But there was one person who, even after learning the die steel grade, spent three months struggling with the issue—yet the problem of the die cracking remained unsolved. He was stamping 0.15mm-thick 304 stainless…