NORSOK M-123
Forged structural steel
锻制结构钢
2012-12-07
YB/T 5221-2014
合金结构钢热轧和锻制圆管坯
Alloy structure steel round tube blank hot rolled and forged for making seamless tube
2014-10-14
YB/T 5222-2014
优质碳素结构钢热轧和锻制圆管坯
Quality hot rolled and forged carbon structural steel round tube blank
2014-10-14