1) Outer diameter: for round pipes  20 ~ 219mm .for square 15*15---200*200 
2) Wall thickness: 0.8~ 8mm 
3) Spec.: Q195, Q215, Q235, Q345 
4) Standards: ASTM-A53, BS1387-1985, GB/T3091-2001. 
5) Steel pipe: 
 a) GTC (galvanized threaded and coupling) steel pipe: DN15-DN200 
    (NB1/2"-NB8") 
 b) GPE (galvanized plain end) steel pipe: DN15-DN200     
 c) Grooved steel pipe: DN15-DN200 (NB1/2"-NB8") 
 d) Used for low pressure liquid delivery such as water, gas, and oil 
 e) The product apply to various anticorrosive pipes