{"id":1525,"date":"2026-09-07T10:19:28","date_gmt":"2026-09-07T10:19:28","guid":{"rendered":"https:\/\/www.wudejiansteel.com\/?p=1525"},"modified":"2026-09-07T10:19:29","modified_gmt":"2026-09-07T10:19:29","slug":"h13-is-not-heat-resistant-enough-for-hot-forging-of-20crmoti-the-die-collapses-before-reaching-3000-pieces-what-type-of-die-steel-should-be-used-for-hot-forging-dies-post-no-582","status":"publish","type":"post","link":"https:\/\/www.wudejiansteel.com\/?p=1525","title":{"rendered":"H13 is not heat-resistant enough for hot forging of 20CrMoTi; the die collapses before reaching 3,000 pieces. What type of die steel\u00a0should be used for hot forging dies? Post No. 582"},"content":{"rendered":"\n

\u201cOur 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?\u201d Mr. Zhu asks: We are currently using H13 steel for hot forging dies made from 2CrMoA, 20MnCr5, and 20CrMoTiH materials, but it lacks heat resistance. The dies collapse after just half a day of use, and after a single repair, we can\u2019t even produce 3,000 parts. What type of die steel<\/a><\/strong>\u00a0should we use for these hot forging dies?<\/p>\n\n\n\n

H13<\/a><\/strong> is used for hot forging dies. Its biggest advantage is its low cost, but its short service life is its biggest drawback. The die surface needs to be reground after every 3,000 strokes, which means repairs are too frequent\u2014we have to stop production for half a day just to repair the die, and that\u2019s a huge waste of time.<\/p>\n\n\n\n

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When you realize a mold is no longer working properly, you have to remove it from the machine, take it to the machining center to trim the surface, and just the time spent clamping it into the machine takes three hours. Then you have to reinstall the mold on the machine, re-calibrate it, and finally start production. Going through this entire process takes at least three to four hours\u2014the time spent repairing the mold is actually longer than the production time. This kind of cost inversion isn\u2019t worth it. You\u2019ll be exhausted, production will stall, and you won\u2019t make any money.<\/p>\n\n\n\n

 Instead of constantly repairing molds, it\u2019s better to use the money saved on repairs to buy higher-quality mold steel. This will extend the mold\u2019s service life, reduce the number of repair cycles, and allow you to produce more parts with fewer repairs\u2014so the boss isn\u2019t worn out, and you make a profit.<\/p>\n\n\n\n

 H13 heat-resistant alloy has a molybdenum (Mo) content of only 1.0%, which is too low to withstand high temperatures. When operating at high temperatures, the mold will quickly anneal, causing its hardness to drop rapidly. This leads to two major problems: mold collapse and cracking\u2014which is also why H13 mold steel is so inexpensive.<\/p>\n\n\n\n

 For hot forging of iron billets, I recommend the heat-resistant steel 8433. 8433 is a proprietary heat-resistant steel from Yuhui Mold Steel; it far surpasses competing products in multiple metrics\u2014including high heat resistance, fatigue resistance, and thermal conductivity\u2014and its performance is second to none.<\/p>\n\n\n\n

\u00a0The heat resistance and stability of 8433 die steel<\/a><\/strong> are 2\u20133 times that of H13, with a hardness of 50\u201354 HRC. Throughout its service life, the mold will not anneal, its hardness will not decrease, and its red hardness is guaranteed, eliminating the two major problems of mold collapse and cracking. It is particularly worth emphasizing that the service life of 8433 is not reduced after mold repair; even if the mold is repaired to the point of scrapping, the hardness on the back surface will not decrease.<\/p>\n\n\n\n

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When Mr. Xing was hot-forging 42CrMo flanges using H13 die steel, the die would crack and collapse after producing 3,000 units. However, when he switched to 8433 heat-resistant steel, he was able to produce 10,000 units each time\u2014a threefold increase in service life. Furthermore, even after four die-surface re-grinding operations, the service life remained unchanged, consistently exceeding 10,000 units per cycle. This means that one 8433 die is equivalent to three H13 dies in terms of usage.<\/p>\n\n\n\n

 Not to mention the 12 fewer surface-refinishing operations\u2014the savings on machining costs are significant. The time saved from these 12 operations alone is already worth two to three days\u2019 worth of output. These additional savings are enough to offset the cost of purchasing the 8433 heat-resistant steel for the die, effectively making the use of 8433 heat-resistant steel free.<\/p>\n\n\n\n

 Regarding the hot forging of 2CrMoA, 20MnCr5, and 20CrMoTiH materials mentioned by Mr. Zhu, H13 is no longer heat-resistant\u2014the die collapses after just half a day of forging, and even after a single die repair, it can\u2019t produce more than 3,000 parts. I recommend 8433 heat-resistant steel. When hot forging dies suffer from collapse or cracking, using 8433 die steel is even more satisfying than eating braised pork.<\/p>\n\n\n\n

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  I am Wu Dejian, the \u201cKing of Mold Steel,\u201d from Dongguan Yuhui Mold Steel. Yuhui Mold Steel is used by three Fortune 500 companies, and Kyocera has been sourcing our products for seven consecutive years. I have helped over 4,000 companies solve complex challenges related to mold material selection, manufacturing, and usage. If you\u2019re unsure about which mold steel to choose, or if the steel you\u2019re currently using results in short mold lifespans, or if you\u2019re unsure which material to use, feel free to reach out to me. I\u2019m confident I can serve as your trusted advisor in this area and help you avoid costly mistakes. Wu Dejian Mold Steel\u2014your trusted advisor\u2014and customers who\u2019ve tried us keep coming back!<\/p>\n","protected":false},"excerpt":{"rendered":"

\u201cOur 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?\u201d Mr. Zhu asks: We are currently using H13 steel for hot forging dies made from 2CrMoA, 20MnCr5, and 20CrMoTiH materials, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1525","post","type-post","status-publish","format-standard","hentry","category-cases"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t