Author: wudejian

Yesterday, Mr. Shi came to Yuhui again to purchase 8566 crack-resistant steel, and he told me: “For cold heading dies, 6.0 40Cr forming dies are prone to cracking. I’ve tried Cr12MoV, DC53, 8566 from a fourth-hand supplier in Ningbo, and Yuhui’s 8566. After comparing them, your Yuhui 8566 die steel still has the longest service life.”…

Mr. Fang asked: “Mr. Wu, this is an A3 smooth-surface panel, 0.8 mm thick, produced using a progressive die made of M2 high-speed steel. After polishing the die, we produced 1,000 units, and now there are scratches again. Would applying a PVD titanium coating solve the problem, or should we switch to a different type…

Mr. Chen asked for recommendations on mold steel materials for thinning and drawing dies used on 3–5 mm thick material.  Upon further inquiry, it was learned that he is performing thinning and drawing operations on 3–5 mm thick Q235 pickled material, with a drawing height of 100 mm and no blankholding. He is currently using…

Sitting here today on this pallet of mold steel ordered by my client, I’d like to share a few thoughts.  This client from Weihai, Shandong, has been buying my mold steel for 10 years now, and we’ve still never met in person. Whenever he places an order, he’s very brief—just two sentences: “Please process the order,” and…

When stamping Q195 steel (3.0) and testing wear-resistant steel 6077, we switched to a medium-speed wire-cut EDM punch. The stamping press output was: 77,000 strokes for flat steel and 82,000 strokes for oval tubing. Since switching to the medium-speed wire-cut EDM punch, die life has jumped from 2,000 strokes to 80,000 strokes—a significant increase by…

Recently, several netizens have asked me about the differences in performance between high-toughness LG steel and 8566 chipping-resistant steel. To make it easier for everyone to understand and remember, I’ve summarized the key differences—there are roughly nine points.  1) The operating hardness differs: LG die steel has a hardness of 54–58 HRC, while 8566 chipping-resistant steel has a hardness…

When I saw six pieces of 8566 die steel ordered by a stainless steel hot-forging plant in the workshop, it occurred to me that H13 wears out too quickly for stainless steel hot-forging dies, so more and more people are switching to 8566 die steel. His stainless steel hot-forging dies originally used H13, and other die steels he…

Just a reminder: Material sticking and stringing in drawing dies has nothing to do with the hardness of the die steel; it is determined by the quality of the steel’s smelting process. Whether your die steel was smelted to a high standard—and whether it contains any microscopic cracks—will determine whether your die experiences sticking or stringing issues.…

Today, let’s talk about a topic related to die steel. When it comes to bending or drawing dies, avoid using Cr12MoV whenever possible.  Between yesterday and today, I’ve received two similar inquiries. The first was from Mr. Song, who asked me: “The bent parts tend to get scratched. What die steel should I use? The…

A zinc alloy sliding block insert made from SKD61 mold steel has been pierced through. The insert has a large end diameter of 6 mm, a small end diameter of 3 mm, and a length of 10 mm. The small end of the pin has broken and bent. This question was asked by a viewer…

What type of mold steel is best for injection mold inserts used to mold PA66+GF30 reinforced nylon? A question from a viewer during the 301st live stream.  Plastic reinforced with 30% glass fiber causes severe erosion to molds. The mold steel must offer good wear resistance and prevent material adhesion, and the mold must definitely be…

Not only will “four-cut” mold steel fail to solve your mold chipping problem, but it will also leave you unsure of where the problem lies and how to optimize your mold. Buying “four-cut” mold steel is a recipe for disaster. Today I received an inquiry regarding cold extrusion of red copper. The client had tried second-grade…