Author: wudejian
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Which die steel is most durable for stamping 0.12–0.18-thick nickel-plated steel sheets at a stamping speed of 300?blog 219
A netizen asked: For nickel-plated steel sheets with a thickness of 0.12–0.18, what type of steel is most durable for high-speed stamping at a speed of 300? When stamping nickel-plated steel strips, the nickel coating on the surface can easily cause the material to stick to the die, leading to adhesive wear on the die…
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What are the different grades of plastic mold steel, and what are their respective applications?blog 218
A netizen asked, “What are the common grades of plastic mold steel?” Commonly used plastic mold steels are divided into three categories: pre-hardened plastic mold steel, rust-resistant plastic mold steel, and high-hardness plastic mold steel. (1) Pre-hardened plastic mold steel is steel that has already been quenched and tempered by the steel mill to the desired hardness…
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Stretching dies are prone to stringing. What type of die steel can solve this problem？blog 217
“What type of tool steel should be used for drawing dies to prevent wire marks?” This has been a frequently asked question recently in live streams and by online users. Some people use Cr12MoV+TD or other coatings for their drawing dies, but string marks appear after producing only a few parts. Others even use DC53 with…
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The copper die-casting factory has placed another order with Yuhui for heat-resistant steel 8433; this time, they ordered 25 pieces.blog 216
A copper die-casting factory once again purchased 25 pieces of heat-resistant steel 8433 from Yuhui for use in its copper die-casting molds. The temperature of molten copper in copper die casting reaches 900°C, which exceeds the annealing temperature of die steel. Die steel with poor heat resistance is prone to annealing. Once annealed, it loses its red…
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4.0 The service life of Yuhui 8566 die steel used for forming hot-rolled sheet into blocks is 10 times that of Si Chao 8566.blog 215
Many people think that 8566 die steel is a standard grade that can be purchased anywhere, but those who have used fourth-grade 8566 die steel and compared it to Yuhui’s 8566 chipping-resistant steel have deeply regretted their choice. Mr. Li was using 4.0 hot-rolled sheet for forming. He had originally purchased a fourth-grade 8566 steel at 109…
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We tested six types of die steel for forging red copper, but the dies cracked after just 3,000 forgings. Finally, we turned to LG die steel for help.blog 214
After two months of testing six types of mold steel and making six phone calls—and still unable to find a solution—Mr. Zhou came yesterday to purchase high-toughness LG die steel. It really wasn’t easy. Mr. Zhou works with cold heading dies for forging red copper. He first contacted me in early June. His die was made of…
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A mold steel that is harder than SKD61, with better toughness and polishability—it’s the LG mold steel that won’t break even if bent by hand.blog 213
A viewer in the livestream asked,“What mold steel has higher hardness, better toughness, and better polishability than SKD61?” Polishing performance is related to the quality of the smelting process; the higher the quality of the smelting process for mold steel, the finer the impurities, and the better the mirror-finish result. SKD61 is a chromium-based hot-work die…
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When punching 0.12–0.2 red copper with a tin coating, the SKH-9 high-speed steel developed burrs after only 20,000 punches, which is highly unusual.blog 212
0.12–0.2 thick tin-plated red copper, using SKH-9 high-speed steel. Currently, after 20,000 production cycles, the punch and cutting edge show wear at the R-corner, causing burrs. What type of die steel would be better? Question from a viewer during Live Stream #297 There are two types of wear: one is friction wear caused by insufficient…
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What type of die steel is best for thin-gauge stretching of 1.2mm cold-rolled sheet without damaging the die？blog 211
1.2 What material is best for thinning and drawing 1.2-thick cold-rolled steel sheets without damaging the die? We’re currently using DC53 with a titanium coating, but it starts to show wire marks after fewer than 1,000 pieces. Question from a viewer during Live Stream #297 Strain lines on drawing dies are the bane of every…
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Yuhui Mold Steel: Every time a new batch of mold steel arrives, we commission a third-party organization to test and ensure its quality—a practice rarely seen among our peers.blog 210
Another batch of mold steel has arrived, and we’re once again having it tested by a third-party lab. Every time new materials arrive or are added to our inventory, we commission a third-party lab to test them. In fact, every piece of mold steel that enters our facility has already been tested, so why do we spend…
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Attend the 2026 Annual Meeting of the Guangdong Heat Treatment Association and receive your membership plaque.blog 209
Today I attended the 2026 Annual Conference of the Guangdong Heat Treatment Association. My main purposes were to receive our membership plaque and to stay updated on industry trends. Here are a few points I’d like to note down: 1) China’s manufacturing sector is truly advanced, with a well-developed industrial ecosystem. These days, heat treatment…
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I didn’t register the trademark for “8566 Anti-Chipping Steel,” which is indeed a regret.blog 208
Yesterday, a close colleague of mine called to chat. He said, “The biggest mistake you ever made was not registering the ‘8566 Crash-Resistant Steel’ trademark back when you were promoting 8566. Now all your competitors are copying and imitating you, and you can’t fight back.” Not registering and protecting the “8566 Anti-Chipping Steel” trademark is…