Author: wudejian

I really didn’t expect that LG die steel could replace low-alloy steel for high-strength shafts—and with such good results.  This is a part subject to impact, requiring high toughness as well as wear resistance. Previously, low-alloy structural steels such as 42CrMo, 38CrMoAl, and even 20CrMnTi were ineffective—even with surface coatings—as the shafts would bulge and deform upon…

A user commented in a live stream asking, “What materials are recommended for pre-hardened steel with a hardness of HRC 40?” There are two main types of pre-hardened steel with a hardness of HRC 40: NAK80 and FDAC. NAK80 is a time-hardening, pre-hardened plastic mold steel with a composition of 10Ni3MnCuAl and a hardness of HRC 40.…

The forming of certain critical load-bearing components requires integral die forging to ensure that the fiber structure (flow lines) of the die-forged part is not severed; the quality of such forgings is superior to that of open-die forgings.  The direction of metal flow in high-stress areas of die-forged parts should align with the direction of…

During last night’s 298th live stream, a viewer asked which die steel would be more durable for machining 0.6 301 stainless steel. Currently, they’re using SKH-51 high-speed steel, but it breaks easily. The product has sharp corners and is a hard material; combined with these three factors, the first material that comes to mind is 8566 chipping-resistant steel.…

Mr. Liu contacted me to inquire about a high-strength, high-toughness steel. For small cores in injection molds for automotive connectors, we typically use various mold steels such as SKD61, SKD11, DC53, ASP23, VIKING, UNIMAX, and others. The part dimensions are 3 × 4 × 72; since the part is so small, it’s prone to breaking.…

Today I attended a seminar on expanding into Vietnam organized by the Guangdong Machinery and Mold Association. After listening to presentations by industry experts, I gained a general understanding of Vietnam. Vietnam has a total population of over 100 million—equivalent to that of China’s Sichuan Province. The average working-age population is 38.8 years old, indicating…

Mr. Liu, who manufactures liquid silicone rubber products, came to purchase Yuhui YH136 mold steel and told me, “We’re familiar with the performance advantages of your YH136. Many of our peers have used it to solve the problems of pitting and poor surface finish that occur when polishing standard S136 mold steel.”  Everyone has their own…

On Monday, as soon as I got to work, I received a bank transfer from Mr. Ying for 10 pieces of heat-resistant steel 8433. Seeing such a large order come in immediately lifted my spirits.  Since last June, Mr. Ying has been placing orders for heat-resistant steel 8433 from time to time, usually in batches…

A customer purchasing cold-forging dies for IGBT copper heat sinks has once again placed an order with Yuhui for 24 pieces of high-toughness LG die steel.  Behind every customer lies a story. This customer manufactures cold-forging dies for IGBT red copper heat sinks. Clients in this industry typically have substantial financial resources. Even the smallest…

If you’re making a die with a TD coating, I strongly advise against using Cr12MoV tool steel—the chances of failure are very high.  I just received an inquiry from a user: they bent 5mm duplex stainless steel into a W-shape using a Cr12MoV die with a TD coating costing 80 yuan per kilogram, but after stamping…

At noon today, an “uninvited guest” showed up. Luckily, I was at the factory; otherwise, he would have come by for nothing again.  Just before 12:00 p.m., I received a call from Mr. Su. He said the die for cold extrusion of 6-series aluminum had cracked, bringing production to a halt. A friend had told…

A customer just came in to purchase 8503 mold steel for a non-stick application—nylon with 30% glass fiber—with a requirement of 1 million cycles.  The original molds used H13 and SKD61, but they started developing flash after producing just over 100,000 parts; this problem has been an ongoing issue for quite some time.  Mr. Zhong’s feedback once…