... s of steel products, include steel plate, profiled bar, steel pipe etc. the steel plate include Common carbon steel plate, Alloy ... steel plate 16MnDR16-32 mm GB3534-1996 line pipe of oil and natural gas16Line pipe of oil and natural gas steel plate ... L245, L290,X42,X52,X60,X65. 8-30 mm APIline pipe of oil and natural gas