Production specification： Outer diameter of steel pipe 20-426 Steel pipe wall thickness of 20-426 20# seamless steel pipe is made of 20# steel, with slightly higher strength than 15#, rarely quenched and no tempering brittleness. Cold deformation plasticity is high, generally for bending, calendering, bending and hammer arch processing, welding performance of arc welding and contact welding is good, gas welding thickness is small, the shape of strict requirements or complex shape of the workpiece is easy to crack. Machinability cold drawing or normalizing state is better than annealing state, generally used to manufacture less stress and high toughness requirements of the workpiece. The material of 20# seamless steel pipe is: high quality carbon structural steel Brand number: 20# Standard: GB8162-2018 GB/T8163-2018 GB3087-2008 GB9948-2013 GB5310-2017