We are a professional manufacturer of ERW weled steel pipes, we can supply u high quality goods ... .Standards:GB/T3091-2001, GB/T9711.1-1997, GBT8162, GBT8163, GBT3087, API 5L 6.Applications:civil construction, petrochemical industry, light industry ... manufacturer & exporter of LSAW steel pipe, SSAW (spiral) steel pipe, ERW steel pipe and other pipes in China, and the steel ...