Steel Grade (钢级 ):
10#,20#, 35#, 45#,Q345B,T35(E235), ST5(E255), ST52(E355), SAE1010,SAE1020, SAE1035,SAE1045,SAE4130, SAE4140, etc

Standards (标准):
国标:GB/T3639
欧标:EN10305-1,EN10305-4
美标:ASTM A519,AMS-T-6736,J524
日标:JIS G3445,etc.

Size Range (尺寸范围 ):
OD(外径范围):4-80mm     WT(壁厚范围):0.5-10mm