{"id":1428,"date":"2026-08-22T08:52:39","date_gmt":"2026-08-22T08:52:39","guid":{"rendered":"https:\/\/www.wudejiansteel.com\/?p=1428"},"modified":"2026-08-22T08:52:40","modified_gmt":"2026-08-22T08:52:40","slug":"what-is-the-difference-between-high-toughness-lg-steel-and-8566-crack-resistant-steelblog-284","status":"publish","type":"post","link":"https:\/\/www.wudejiansteel.com\/?p=1428","title":{"rendered":"What is the difference between high-toughness LG steel and 8566 crack-resistant steel?blog\u00a0284"},"content":{"rendered":"\n

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\u2019ve summarized the key differences\u2014there are roughly nine points.<\/p>\n\n\n\n

\u00a01) The operating hardness differs:\u00a0LG\u00a0die\u00a0steel<\/a><\/strong>\u00a0has a hardness of 54\u201358 HRC, while 8566 chipping-resistant steel has a hardness of 58\u201360 HRC; 8566 is harder.<\/p>\n\n\n\n

 2) Toughness differs: LG\u2019s toughness is 8\u20139 times that of DC53\u2014it\u2019s so tough that it won\u2019t break even if you bend it; 8566\u2019s resistance to chipping is 4 times that of high-speed steel SKH-9 and 2 times that of D2; LG has better toughness than 8566.<\/p>\n\n\n\n

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3) Wear resistance differs: Because 8566 has a higher total alloy content and greater hardness, it offers better wear resistance.<\/p>\n\n\n\n

 4) Resistance to hot metal erosion differs. As verified by die-casting experts, LG mold steel outperforms H13, SKD61, 2344, 8418, and others. In the field of die-casting molds, LG has a broader and more extensive range of applications than 8566.<\/p>\n\n\n\n

 5) Heat resistance differs; 8566 has a very high molybdenum content in its heat-resistant alloy, making its heat resistance twice that of LG.<\/p>\n\n\n\n

6) High-temperature strength differs; because 8566\u2019s heat-resistant alloy has high hardness, its high-temperature strength is naturally superior.<\/p>\n\n\n\n

7) Resistance to thermal wear: 8566 offers high heat resistance, high hardness, a high total alloy content, and excellent resistance to thermal wear, resulting in a long service life when used in hot forging. As Mr. Zhang mentioned, when hot forging 304 stainless steel, 8566 receives a five-star rating\u2014the finished product has excellent surface finish, resembling that of a tube, a performance that other die steels simply cannot match.<\/p>\n\n\n\n

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8) The heat treatment processes differ. The heat treatment process for 8566 is complex; we use a dedicated furnace and our own proprietary heat treatment process. If you purchase 8566 die stee<\/strong>l<\/a>, be sure to have it heat treated upon receipt.<\/p>\n\n\n\n

9) Different Areas of Expertise. LG offers high toughness and is primarily used in applications with exceptionally high toughness requirements but no particularly high wear resistance requirements, such as cold extrusion dies for copper and aluminum, molds for glass-fiber-reinforced plastics, fine cores in plastic molds, PING pins for connectors, and aluminum extrusion dies.<\/p>\n\n\n\n

 8566 is primarily used in chipping scenarios that high-hardness mold steels cannot resolve. With a hardness of 58\u201360 HRC, it is specifically designed to address chipping issues that high-hardness mold steels such as D2, DC53, and SKH-9 cannot overcome. It is used to resolve chipping issues in stainless steel stamping, sharp-corner stamping, narrow-flange stamping, and even cases where the punch width is less than the sheet thickness or the stamping ratio is less than 1:1\u2014problems that standard die steels cannot handle.<\/p>\n\n\n\n

 8566 is also used in cold heading dies, dies subjected to external stamping forces, and hydraulic dies with fine patterns. Furthermore, 8566 is particularly widely used for punches in hot forging dies.<\/p>\n\n\n\n

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I am listing these properties today to help everyone remember them and facilitate material selection. When choosing a specific die steel, we must comprehensively consider the properties of the material being stamped, the die structure, the operating conditions of the die, and the performance requirements of the die itself. Only then can we match the die\u2019s performance needs, and the best choice is the one that suits your specific operating conditions.<\/p>\n\n\n\n

 It\u2019s also important to note that \u201cLG\u201d and \u201c8566\u201d are not national steel grades; they are our company\u2019s proprietary designations\u2014exclusive products of Yuhui. They are not publicly available and constitute our intellectual property. However, due to the exceptional performance of these two materials, their high market visibility, strong sales, and the fact that customers specifically request them, they have been widely copied by competitors across the internet and even serve as reference standards for certain major steel mills\u2014a truly unprecedented phenomenon in the industry.<\/p>\n\n\n\n

 The performance specifications I have listed apply exclusively to Yuhui\u2019s LG and 8566 and do not apply to the imitations. If you see these exact same specifications elsewhere, they have undoubtedly been copied and pasted from my content.<\/p>\n\n\n\n

*************<\/p>\n\n\n\n

Wu Dejian’s\u00a0tool\u00a0steel<\/a><\/strong>, the chief of staff of the user, bought everything he had used.<\/p>\n","protected":false},"excerpt":{"rendered":"

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\u2019ve summarized the key differences\u2014there are roughly nine points. \u00a01) The operating hardness differs:\u00a0LG\u00a0die\u00a0steel\u00a0has a hardness of 54\u201358 HRC, while 8566 chipping-resistant steel has a hardness […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1428","post","type-post","status-publish","format-standard","hentry","category-blog"],"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