Author: wudejian
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When deep-drawing a cylinder from 1.5mm-thick DC04 deep-drawing sheet, using tungsten steel caused some wire marks; Cr12MoV + Thermal Treatment (TD) worked better. Blog.310
Mr. Qian came to consult me about deep-drawing 1.5mm-thick DC04 sheet metal into cylinders. Initially, he used Cr12MoV with thermal treatment (TD), but the dies didn’t last long and kept developing draw lines. A while back, he spent several thousand yuan per kilogram on YG11 cemented carbide, but the dies started showing draw lines after…
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Every piece of mold steel received by Yuhui undergoes third-party testing—a practice rarely seen in the industry—and our factory conducts these tests in accordance with brand requirements.blog 309
Over the past two months, we’ve received a new shipment of 100 metric tons of mold steel, which is currently being tested by a third-party lab. This testing seems both useful and useless. It’s useless because the tests don’t reveal any issues—the mold steel has no quality problems, and it’s exactly what we want. It’s useful…
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When should high-hardness die steel be selected for hot-forging dies? Shallow-cavity hot-forging dies require high-hardness die steel.blog 308
When Should High-Hardness Die Steel Be Selected for Hot Forging Dies? The primary failure modes of hot forging dies are die collapse and cracking. This is because die temperatures during the hot forging process approach 600°C. At such high temperatures, many die steels with poor heat resistance undergo annealing, leading to die collapse and cracking. To…
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Hot forging 35 steel at 1,100°C; heat-resistant steel 8433 increased mold life from 5,000 cycles to 10,000 cycles.blog 307
For hot forging of 35 steel heated to 1100°C, the heat-resistant steel 8433 increased die life from 5,000 to 10,000 cycles. This good news was shared with me yesterday by Mr. Wang, who has been using 8433 for over two years. Mr. Wang specializes in hot forging and stamping of 35 steel, a process with relatively…
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What type of die steel is durable enough for punching 4.5mm-thick 40Cr? DC53 starts to develop burrs when punching 6000.blog 306
Although 8566 anti-cracking steel is expensive, there are some operating conditions where you have no choice but to use it. Mr. Deng contacted me for advice. He is stamping 4.5mm-thick 40Cr hot-rolled sheet with a material hardness of 26 HRC. Currently, he is using DC53 die steel for the cutting edges, but after 6,000–7,000 stamping cycles,…
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Tungsten steel hot-forging dies for nuts are too expensive, so we substituted them with 8566 die steel, reducing costs by 90%.blog 305
Hot forging dies require high heat resistance to prevent annealing, which can lead to a decrease in hardness, die collapse, and cracking—all of which shorten the service life of hot forging dies. When it comes to hot-forging dies for standard nuts, everyone prefers to use tungsten carbide dies because of their excellent heat resistance, high…
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Hot-forged No. 10 steel motor housings: HD punch tips collapse after just a few thousand strokes, while hot-forging punch tips made from 8566 die steel can withstand over 200,000 strokes. Post No. 583
After several days of deliberation, Mr. Du’s order for 8566 round bars was finally placed. This is a classic and successful case study: hot-forging No. 10 steel motor housings, hot-forged motor housings made from 10 steel, with hot-forging punches made from 8566 die steel—each punch has a total service life of over 200,000 strokes. In…
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H13 is not heat-resistant enough for hot forging of 20CrMoTi; the die collapses before reaching 3,000 pieces. What type of die steel should be used for hot forging dies? Post No. 582
“Our hot forging dies need to be re-surfaced every half day, and each resurfacing takes three hours. The time spent on production is about the same as the time spent on repairs. Is this cost-effective?” Mr. Zhu asks: We are currently using H13 steel for hot forging dies made from 2CrMoA, 20MnCr5, and 20CrMoTiH materials,…
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What die steel is recommended for hot-forging 316L stainless steel liquid-cooled plates? The 8418 mold steel cracked after forging 200 pieces.blog 304
We received an inquiry from Mr. Li in Nantong, Jiangsu, asking for recommendations on die steel for hot forging 316L stainless steel. Upon further inquiry, we learned that he is hot forging liquid-cooled plates that have been normalized. His current die is made of 8418 mold steel, but after producing just 200 parts, the die cavities…
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For injection molding of PPS+GF20, which is better for the mold steel: SKD61 or 8503?blog 303
A netizen called to ask me: For PPS+GF20 reinforced plastic, is SKD61 or 8503 a better choice for mold steel? This netizen is developing a new mold with an annual production volume of 200,000 units, but the mold is intended for long-term use—perhaps even for ten or twenty years. The design engineer said SKD61 would…
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DC53 and SKH-9: When punching 0.3 mm pure titanium, why do burrs appear after just a few hundred punches?blog 302
The factors that determine the performance of die steel are alloy composition, smelting quality, and heat treatment processes. These three elements form a three-legged stool where each supports the others; if any one of them is weak, it will affect the performance of the die steel and its service life. A netizen asked me what…
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Heat-resistant steel 8433 for hot forging of stainless steel has a longer service life than H13 and is more cost-effective.blog 301
When you can’t shoot a video, come take a walk around the workshop—you’ll have something to say. I saw four pieces of 1.5-metric-ton batches of high-quality 8433 heat-resistant steel ready for shipment, and I just wanted to tell you that the heat resistance and stability of 8433 are 2–3 times that of H13, with a…