ERW line pipe-- for the transportation of oil, natural gas and chemical materials
Standards: AP-5L PSL1/PSL2 GB/T9711.1-1997 GB/T9711.2-1999Steel
Grade ：A、B、X42、X46、X52、X56、X60、X65、X70
ERW Casing pipe--petroleum and nature air exploration
Standards： API SPEC 5CT, SY/T5989
Materials ：H40 J55 K55
Structure and Mechanical Roundpipe and Tubing
Standards: JIS3466、JIS3445; ASTM A513; GB/T 6728-2002
Steel Materials: carbon steel or low ally steel
Structure and Mechanical Square or Rectangular Pipe
Standards: GB/T3091 JIS G3452
Steel grade: Q215A、Q215B、Q235AB 、Q295AB、Q345AB
