... T3091-2001, GB/T9711.1-1997, GBT8162, GBT8163, GBT3087, API 5L 6.Applications:civil construction, petrochemical industry, light industry, mainly ... a professional manufacturer & exporter of LSAW steel pipe, SSAW (spiral) steel pipe, ERW steel pipe and other pipes in China, and the ... steel pipes can be supplied according to GB, ASTM, API, DIN ...