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

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