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首页> 美国政府科技报告 >SECONDARY HARDENING STEEL HAVING IMPROVED COMBINATION OF HARDNESS AND TOUGHNESS AND METHOD of PREPARATION
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SECONDARY HARDENING STEEL HAVING IMPROVED COMBINATION OF HARDNESS AND TOUGHNESS AND METHOD of PREPARATION

机译：具有硬度和韧性改进组合的二次硬化钢及其制备方法

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The secondary hardening alloy steel composition consists essentially of about 0.25 to 0.5% carbon, about 0.5 to 1.0% manganese, about 1.5 to 3.0% nickel, about 0 to 1.0% chromium, about 1.75 to 2.5% molybdenum, about 0 to 0.4% vanadium, and an additive selected from about 1 to 3% aluminum and a combination of at least about 1% aluminum and at least about 1% silicon for a combined Al + Si content of about 2 to 4%, the balance being iron and impurity elements. The present steel composition has the following characteristics: it exhibits a flat tempering response, it is hardenable upon tempering to a Rockwell C hardness of at least 50, and it has an improved combination of hardness vs. toughness properties after tempering in the secondary hardening range. A method of preparation is also described. (ERA citation 04:037054)

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