ERW PIPE(ZINC/BLACK) MATERIAL:Q235 Q345 A B X42 X46 X52 X56 X60 X65 X70 ASTM A53-05,API SPEC 5L,API SPEC 5CT DIA 21.3mm-508 ERW PIPE (ZINC/ BLACK)MATERIAL:Q235 Q345 A B X42 X46 X52 X56 X60 X65 X70ASTM A53-05, API SPEC 5L, API SPEC 5CT, GB/T3091-2001, GB/T3793-92, GT/T9711.1-1997, GT/T9711.2-1999nominal outer diametermm21.326.733.442.248.360.373.088.9114.3139.7141.3159.0168.3177.8193.7219.1244. ...