- SSAW/SAW STEEL PIPES
- 2016-10-30 13:16
- Quality Standard:GB/T3091 Welded steel pipe for low pressure liquid deliveryGB/T9711 Petroleum and natural gas industrie
- ERW (Electric Resistance Welded)
- 2016-10-25 01:27
- Quality Standard:ERW HFI , EFW,:GB/T3091 Welded steel pipe for low pressure liquid deliveryGB/T9711 Petroleum and natura