ASTM A53 ERW Black Steel Pipe 1,standard:ASTM,DIN,BS,JIS 2, ... 1/2-24 Certification:ISO API ASTM A53 ERW Black Steel Pipe1,standard:ASTM,DIN,BS,JIS2,material:10#, ... size:1/2-24Certification:ISO APIType:ASTM A53 ERW Black Steel PipeSize:1/2-24(21.34-609.6mm)WT ... requirement.b) Anti-corrosion and high-temperature resistant with black painting. Packing of bundleTransportation: Certification:The products of ...