尿素高压设备制造检验方法 第2部分：尿素级超低碳铬镍钼奥氏体不锈钢选择性腐蚀检查和金相检查
Fabrication and inspection method for high pressure urea equipment - Part 2: Selective corrosion examination and metallography examination for ultra low-carbon chromated nickel molybdenum austenitic stainless steel of urea grade