spiral weld carbon steel pipe 1. Grade: Q345B, API X42 - X80, L245, L555, J55, N80 2. Standard: SY/T5037-2000, GB/T Spiral ... they need. 1. Material: carbon steel2. Grade: Q345B, API X42 - X80, L245, L555, J55, N803. Standard: SY/T5037-2000, GB/T9711.1 ... -20mm,3. Length: 3-12m4. Steel Grade: Q345B, API X42 - X80, L245, L555,J55, N805. Standard: SY/T5037-2000, GB/T9711.1 ...