Classification of Cold Work Die Steel in the United States
Cold work die steel is divided into five groups: W group, O group, A group, D group, S group.
Group W is the water quenching tool steel, with 11 steel grades and 7 carbon tool steels, with a carbon content ranging from 0.7% to 1.3%.
Group O is oil quenching and cold working die steel (commonly known as oil steel), with 4 steel grades and carbon content of 0.85%-1.55%;
The group is the air quenching alloy cold work die steel, there are 9 steel grades, and the carbon content is from 0.5%-2.25%.
Group D is high-carbon and high-chromium cold work die steel, with 7 steel grades and a carbon content of 0.9%-2.5%.
Group S is an impact-resistant tool steel, with 7 steel grades and a carbon content of 0.4%-0.6%.
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Also used for cold work dies are high-speed steel (Hss group) and ultra-high speed steel (Shss group), cobalt-based cemented carbide and steel-bonded cemented carbide (Ha group), powder steel and engineering ceramics (Pim group), carbon tungsten tool steel (F group), special purpose tool steel (L group).
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Effect of heat treatment on the properties of FT32 die steel
1) The cold work die steel locks the improvement of the machining accuracy of the mold, according to the traditional heat treatment process of "high quenching and high return" and "low quenching and low return", and the proportion of mold cracking in the wire cutting process after heat treatment is high.
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2) Low heat resistance hot work die steel is one of the most widely used types of die steel, in actual production, usually using quenching oil cold heat treatment, in the core area of large die steel in the oil cold quenching will inevitably produce bainite structure, will seriously deteriorate the impact toughness of die steel.
3) The reason why pre-hardened plastic mold steel is used to manufacture large and medium-sized plastic molds with complex shapes and precision is to avoid heat treatment after cavity processing, and heat treatment defects such as quenching deformation, cracking, and decarburization will occur.