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发明授权
CN105441788B 含钒12.9级轨道交通移动装备用紧固件用钢及其热处理工艺 有权

含钒12.9级轨道交通移动装备用紧固件用钢及其热处理工艺
摘要：
本发明提供含钒12.9级轨道交通移动装备用紧固件，主要包含以下质量百分含量(％)的化学元素：C 0.33～0.38％，Si 0.05～0.10％，Mn 0.70～0.90％，Cr 0.70～0.90％，Ni 0.60～0.90％，Mo 0.20～0.30％，Als 0.015～0.045％，V 0.06～0.10％，[N]0.006～0.010％，P≤0.010％，S≤0.005％，T[O]≤0.0015％；热处理后钢材的奥氏体晶粒度大于10.0级；热处理后钢的组织为回火索氏体基体上弥散分布少量细小先共析铁素体，其中，先共析铁素体量≤3％，尺寸≤5μm。
摘要（英）：

The invention provides a vanadium-containing 12.9-grade steel for a fastener applied to rail transit mobile equipment. The steel mainly comprises the following chemical elements in percentage by mass: 0.33% to 0.38% of C, 0.05% to 0.10% of Si, 0.70% to 0.90% of Mn, 0.70% to 0.90% of Cr, 0.60% to 0.90% of Ni, 0.20% to 0.30% of Mo, 0.015% to 0.045% of Als, 0.06% to 0.10% of V, 0.006% to 0.010% of [N], smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S and smaller than or equal to 0.0015% of T[O]. The thermally-treated steel is larger than 10.0 grades in austenitic grain size; the structure of the thermally-treated steel is a small amount of small proeutectoid ferrite dispersed on a tempered sorbite base body, wherein the amount of the proeutectoid ferrite is smaller than or equal to 3%, and the size of the proeutectoid ferrite is smaller than or equal to 5 micrometers.

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