Main specification for our company"s seamless tubes is 8-630, the implementation standards of it is GB/T8163-1999, GB/T8162-199, GB/3087-1999, API 5L, API 5CT, ASTM A106, ASTM A53, BS1387-1985, material is 10, 20, 35, 45, A106, A36, and all kinds of alloy seamless steel tubes.