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