... , 30CrMo, Q345, St37, St52, St45, St35.8, ST35 Technique Cold rolled, Cold drawn Thickness1-14mm , or as your requirements Outer diameter6-114mm ... , 30CrMo, Q345, St37, St52, St45, St35.8, ST35 Technique Cold rolled, Cold drawn Thickness1-14mm , or as your requirements Outer diameter6-114mm ... you, please contact with me! DIN 2391 precision seamless steel pipe