Seamless steel pipe process

　　Seamless steel pipe is a kind of steel pipe material. Q represents the yield value of this material, followed by 345, which means that the yield value of this material is about 345. And with the increase of material thickness, the yield value will decrease. Q345A is no impact; Q345B is 20 ℃ normal temperature impact; Q345C is 0 ℃ impact; Q345D is - 20 ℃ impact; Q345E is - 40 ℃. At different impact temperature, the impact value is different. Q345A，Q345B，Q345C，Q345D，Q345E。 This is the distinction of grades, mainly because the impact temperature is different! Q345B seamless steel pipe weight formula: [(outer diameter wall thickness) * wall thickness] * 0.02466 = kg / M (weight per meter)

　　Process flow of seamless steel pipe

　　billet -- Inspection -- peeling -- Inspection -- Heating -- piercing -- pickling -- grinding -- lubrication and air drying -- welding head -- cold drawing -- solid solution treatment -- pickling -- pickling and passivation -- Inspection -- cold rolling -- degreasing -- cutting head -- air drying -- internal polishing -- external polishing -- Inspection -- marking -- finished product packaging Process flow of industrial pipe billet -- Inspection -- peeling -- Inspection -- Heating -- piercing -- pickling -- mushroom repairing -- lubrication and air drying -- welding head -- cold drawing -- solid solution treatment -- pickling -- pickling and passivation -- Inspection