Category: blog

Last night, June 22, 2026, I hosted a 1-hour-and-18-minute livestream—my 296th livestream.  This livestream received 29,000 impressions, with 1,164 viewers. The average watch time per viewer was 1.5 minutes, with an average of 24 viewers online at any given time and a peak of 46. I gained 19 new followers.  The highlight of this stream’s…

For stamping solid chain links, I still recommend PM23 powdered high-speed steel, which is of high smelting quality, free of microscopic cracks, and offers high hardness and good wear resistance. Mr. Zhou asked what die steel to use for stamping 0.5mm-thick nickel strips. He is currently using SKH-9 high-speed steel, but after stamping 5,000–6,000 parts, the punch…

The quality of the smelting process is the most critical factor for drawing dies. If the die steel exhibits segregation or contains a large number of microscopic cracks invisible to the naked eye, the die will start to produce stringing after producing only a small number of products.  Mr. Zhou asked me, “What material is best for…

Mold users who buy mold steel based solely on the grade—without considering the quality of the smelting process—will never produce high-quality molds.  For some molds, even when a high-grade mold steel is used, the mold’s service life remains very short. People often assume the problem lies with the steel grade and never question the quality of the…

 A viewer in the live stream asked about a continuous punching die for 0.5-thick silicon steel sheets. Since tungsten steel is too expensive, is there a high-speed steel that can be used as a substitute? The punching speed is 200–300. Ever since the price of tungsten steel tripled, mold costs have become unsustainable, leading many…

A viewer in the livestream asked: “The hardness of the 05 high-strength steel is 42 degrees, but now, after machining 10,000 pieces, it keeps developing burrs. What kind of die steel should I use?”  Stamping 0.5mm-thick 65Mn steel sheets with a hardness of 42 HRC involves stamping thin, hard material, which places extremely high demands on…

The best news today is that Midea has once again placed an order with Yuhui for non-stick 8503 mold steel. This marks the third consecutive year they’ve placed an order with us, and they’re paying in cash.  For Midea’s tapered dies, they initially used Cr12MoV, which was prone to sticking and scratching. Later, they tried DC53,…

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…

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,…

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…

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…

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…