Metal treatment – Stock – Ferrous
Patent
1998-05-29
2000-04-25
Yee, Deborah
Metal treatment
Stock
Ferrous
148325, 148334, 148579, 148605, C21D 602, C22C 3822, C22C 3824
Patent
active
060539917
ABSTRACT:
Disclosed are a cold working tool steel suitable for plastic cold working tools used under severe service conditions, such as forming dies, forming rolls, and form rolling dies, and a process for producing the same. The cold working tool steel has wear resistance and tensile compression fatigue strength and at the same time can provide improved die life. The cold working tool steel is characterized by comprising by weight 0.65 to 1.3% of carbon, not more than 2.0% of silicon, 0.1 to 2.0% of manganese, 5.0 to 11.0% of chromium, 0.7 to 5.0%, in terms of molybdenum equivalent (molybdenum+tungsten/2), of at least one member selected from molybdenum and tungsten, 0.1 to 2.5%, in terms of vanadium equivalent (vanadium+niobium/2), of at least one member selected from vanadium and niobium, and optionally 0.010 to 0.10% of sulfur with the balance consisting of iron and unavoidable impurities, an M.sub.7 C.sub.3 carbide having a grain diameter of 5 to 15 .mu.m being present in a percentage area of 1 to 9%. The process is characterized by comprising the steps of: providing a steel product having the above chemical composition; and tempering the steel product at a temperature of 150 to 500.degree. C., preferably 150 to below 450.degree. C.
Tsujii Nobuhiro
Yokoi Daien
Sanyo Special Steel Co., Ltd.
Yee Deborah
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