Category: blog

A netizen asked: For hot die forging of stainless steel, what type of die steel offers the best fatigue resistance and heat resistance? During last night’s 296th live stream, Hot forging of stainless steel involves high operating temperatures; parts must be heated to nearly 1200°C. The high temperature of the parts causes the die to heat…

Question from a viewer in the live stream: What type of die steel is suitable for drawing? I’m cold rolling 1mm-thick material, and there are always drawing marks. Stretch dies are most susceptible to stretch marks, and die steel of poor smelting quality is also most prone to them. He is currently drawing 1 mm-thick cold-rolled…

Mr. Yuan wanted to purchase 8566 die steel, but after discussing the matter in detail, I advised him against it because the operating conditions of his die were not suitable for this material.  He is stamping 0.5mm-thick silicon steel sheets and described the process as high-speed stamping—3 strokes per second. He is currently using SKH-9,…

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,…