Author: wudejian

I saw two large pieces of 8433 heat-resistant steel ready for shipment in the workshop, which put me in a good mood. These two pieces weigh over 700 kilograms; we produced a total of four pieces this time, weighing one and a half metric tons in total.  This customer manufactures hot-forging dies for stainless steel.…

I have some good news to share with everyone. Mr. Lan came back today and told me: “The service life of your 8566 cold heading bolt dies can range from 6,000 to 17,000 cycles. The service life is comparable to that of the previous tungsten steel dies, but 8566 costs only one-fifth the price of…

Mr. Lin, whom I haven’t been in touch with for many years, reached out to ask: He currently has a part that’s injection-molded from nylon, and the mold contains multiple cores—four of which are relatively thin. He’s currently using H13 mold steel, but the cores keep breaking after producing only a few parts—sometimes one breaks,…

Last night, August 2, 2026, I hosted a one-hour live stream—my 301st live stream.  The live stream reached 7,410 people, had 493 viewers, with an average watch time of 1.66 minutes per viewer. The average number of concurrent viewers was 11, the peak was 21, and I gained 4 new followers. The metrics for this…

Mr. Jia is hot-forging hexagonal nuts. Currently, the bottom die is made of H13 and is kept submerged in water, but H13 is prone to wear—it typically wears out after 20,000 strokes, or it chips or cracks. What type of die steel would you recommend? For hot forging dies, high heat resistance is the top priority. H13…

At noon today, before we even started work, a client came to the factory to inspect the 8433 heat-resistant steel.  This visit had been scheduled a few days ago. She had asked me to stop by their company, but since I couldn’t make it, the purchasing manager and the tooling supervisor came together instead.  This…

Douyin Store Inquiry: The temperature at the hot runner gate is 190°. When using H13 for small inserts, they tend to break. We’re now using beryllium copper; although they don’t break, they wear out easily and have a short service life—they break after only 3,000–5,000 cycles. The top of the small pin is only 1 mm,…

Question from a live stream viewer: How does M42 perform when punching 1.5 304 stainless steel or performing drawing operations?  M42 is a W2Mo9Cr4V2Co8 high-speed steel with 8.0% cobalt content. It has a heat-treated hardness of 65–68 HRC and offers excellent wear resistance and red hardness; However, due to its high total alloy content, the…

Question from a viewer during Live Stream #301: Is cryogenic treatment necessary for DC53?  Cryogenic treatment is definitely necessary. After cryogenic treatment, DC53 has less retained austenite, resulting in better wear resistance compared to untreated DC53. Second, retained austenite is an extremely unstable microstructure. If there is too much retained austenite in the mold steel,…

“What kind of mold steel is best for copper die-casting molds?” This was the question asked last week by a customer who manufactures copper die-casting molds when he visited Yuhui to inspect the 8433 heat-resistant steel.  He specializes in copper die-casting molds. Currently, he uses 8407 and 8418 mold steel from a certain supplier. For smaller parts,…

Yesterday, I spoke with a client who always seems to think of himself as just a small operation—as if anyone would look down on him because of his small scale—and he comes across as lacking in confidence. We must never think this way. To put it bluntly, those of us who run small factories are…

During the 301st live stream, a business owner who manufactures plastic molds asked: For plastic molds with small pillars, is 2344 or S136 a better choice?  Plastic molds with small pillars are essentially molds with bosses. During the injection molding process, these bosses are subjected to compressive forces, so the material must meet requirements for…