1.carbon steel pipe 2.ISO9001 standards 3. ... 5.for auto and motorcycle power precision steel pipe 1. material: Q195,Q235,20#,45#, 45MN ... good,steel tube is under great pressure,cold bending deformation,mouth,crushed expansion without crack, ... punch, pickling, repair mushroom - lubrication dry - welding head - cold drawn - solid solution treatment, pickling, pickling passivation - inspection7.use: Widely ...