20号钢的简介大纲20#钢含碳量Carbon content of # 20 steel20#钢热处理规范Heat treatment specification for # 20 steel20#钢金相组织Metallographic structure of 20# steel20#钢执行标准20# steel as per standard20#钢淬火硬度Quenching hardness of # 20 steel20#钢力学性能Mechanical properties of # 20 steel20#钢交货状态20# steel delivery status20#钢许用应力Allowable stress of # 20 steel20#钢化学成份20# toughening ingredients
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