The commom materials ---20# and Q345
Technical standard:API 5LGR.B , ASTM A106/A53 GR.B;
High-pressure boiler pipe,fluid pipe

API  5L seamless  pipe

1. Size: 1/4'' to 24''
2 Standards: ASTM, API, DIN ,JIS
3 Surface: Oiled,varnished or black painted to prevent rust 

4. Steel Grade: 10#, 20#, Q345 etc