1.seamless pipe: size: φ10mm-φ630mm material: 10# - 45# Q345 A, B, C, D 27SiMn 40Cr 40CrMn 20CrMn 30Mn executive standard: GB8162 (structural pipe) GB8163 (fluid pipe) GB3087-99 (boiler pipe) GB5310-95 ( boiler pipe for high pressure) GB6479-2000 (fertilizer special pipe) GB9948-88 (petroleum cracked pipe ) DIN17175-95 (German standard) ST45.8111 SA106B etc,foreign standard. 2.straight weld tubing,galvanized pipe; size: φ10mm-φ630mm material: Q195-Q235 16Mn Q345 A, B 3.welding square pipe/rectangular tube,galvanized square and rectangular pipe. Size: φ12mm-φ400mm material: Q195-Q235 4.screw seam two submerged-arc welding pipe size: φ159mm-φ2200mm material: Q235B Q345B