... carbon steel pipe 1. Grade: Q345B, API X42 - X80, L245, L555, J55, N80 2. Standard: SY/T5037-2000, GB/T Spiral weld carbon ... customers can always find what they need. 1. Material: carbon steel2. Grade: Q345B, API X42 - X80 ... , L245, L555, J55, N803. Standard: SY/T5037-2000, GB/T9711.1 ... . Standard: SY/T5037-2000, GB/T9711.1-97, API Spec 5L6. Packing: Plastic plugs ...