We are a professional manufacturer of ERW weled steel pipes, we can supply ... 2001, GB/T9711.1-1997, GBT8162, GBT8163, GBT3087, API 5L 6.Applications:civil construction, petrochemical industry, light industry, ... of LSAW steel pipe, SSAW (spiral) steel pipe, ERW steel pipe and other pipes in China, and the ... pipes can be supplied according to GB, ASTM, API, DIN, JIS standards, the factory is locating in ...