Author: wudejian

During the 297th live stream, a viewer asked what mold steel to use for injection molding 40% fiber-reinforced PPS. They noted that H13, even after heat treatment to increase hardness, is not durable, and the same applies to 2344. H13 and 2344 are 4Cr5MoSiV1 medium-carbon steels with a carbon content of 0.38%. Their hardness is only…

He added me on WeChat back in 2022, and today he asked again, “How much does 8433 mold steel cost per kilogram?”  This is already the fourth time someone has asked me how much per kilogram it costs across these two WeChat accounts, so I told him straight up: “We added each other on WeChat back…

I’m pretty happy to hear the good news that the 8566 has increased mold life by 10 times.  Mr. Li said, “The last time I bought a piece of your 8566, it worked really well.”  I asked him, “How many products can the current 8566 stamp in one go?”  He replied, “The service life has…

Reverse-punch die, carbon steel blank, temperature 1200 degrees. H13 cracks after only 100 pieces. Do you have any mold steel recommendations? The reverse extrusion process is carried out using hydraulic presses, which operate at a very slow stroke rate. Since the punch remains in contact with parts at a high temperature of 1200°C for an extended…

I need to stamp hard stainless iron 410, 1.2 thick, with sharp corners. What type of die steel is both chip-resistant and durable? Question from a viewer during Live Stream #296. Stamping 1.2mm-thick 410 stainless steel with sharp corners—a material that is both hard and has sharp edges—places high demands on the die steel’s resistance to…

Wire drawing in deep-drawing dies is an extremely common phenomenon—and even a major pain point in the deep-drawing industry. During my 296th live stream, several viewers reported issues with wire drawing in their deep-drawing dies. Three of these cases left a particularly strong impression on me; they all asked what type of die steel to use…

It is generally accepted that steel with a tensile strength of o>1470 MPa (150 kgf/mm²) that also possesses toughness is referred to as ultra-high-strength steel; today, there are also ultra-high-strength steels with tensile strengths reaching 2400 MPa.  Ultra-high-strength steel is primarily used in rocket engine casings, aircraft landing gear, fuselage frames and skins, high-pressure vessels,…

What type of die steel should be used for deep drawing a galvanized steel basin with a thickness of approximately 0.23 mm? Question from a viewer during Live Stream #296.  Stamping a 0.23 galvanized steel basin is a typical application for thin-gauge steel. Since the material is not hard and does not require extremely high wear…

During the 296th live stream, a viewer asked: “When punching 0.2mm TA1 titanium sheet with SKD11 dies and punches, there is significant burr formation. SKD11 dies can only produce 20,000–30,000 parts before burrs appear. What type of die steel should be used for punching 0.2mm TA1 titanium sheet?”  Titanium has excellent strength and toughness, with a typical hardness…

Last night, June 28, 2026, I hosted a 1-hour-and-20-minute livestream—my 297th livestream.  This livestream reached 6,613 people, had 605 viewers, an average watch time of 2.22 minutes, an average of 18 concurrent viewers, a peak of 49 concurrent viewers, and gained 10 new followers.  In comparison, my previous stream (No. 296) had 29,000 impressions, 1,164…

What type of die steel is best for punching 5mm red copper? A viewer asked me this question during the 296th live stream. Punching red copper tends to cause copper powder to stick to the punch. The punch must not only resist material adhesion but also have a hardness of 58 HRC; crucially, it must…