... blank, bright and galvanized, or paintedC: Length of each pipe: 500mm-16,000mmD: Steel grade: 10#, 20#, A106B, A53B, Q195 Q235, Q345 ... thickness of 3~30mmStandardGB/T8162,GB/T8163 and DIN/JIS/ASTM standarda. DIN Standard 10#(ST37-2,ST35-8),20#(ST42 ... ,ST45-4/8),45#(DIN CK45),16mn(ST52.4) etc.b. JIS Standard10#(STPG38 ... not hesitate to let us know, thanks! Zinc coating steel pipe