1)size OD20-219mm,wall thickness0.8-8 2)standards ASTM A53,BS1387,GB 3)Grades Q195 Q215 Q235 Q345 1)size OD20-219mm,wall thickness0.8-82)standards ASTM A53,BS1387,GB3)Grades Q195 Q215 Q235 Q3454) sortsGTC(galvanised threaded and coupling)DN15-DN200,(NB1/2"-NB8")GPE(galvanised plain ends)DN15-DN200Grooved steel pipe DN15-DN200,(NB1/2"-NB8")used for low pressure liquid delivery,and for ...