20 × seamless steel pipe is a low-carbon steel pipe. Carbon steel is generally divided into three types: low carbon steel, medium carbon steel and high carbon steel. 45 × steel is medium carbon steel, lower than 45 × is low carbon steel, higher than 45 × is high carbon steel. If there is no special requirement for seamless steel pipe, 20 × seamless steel pipe is generally used.
The material of 20 × seamless steel pipe is 20 × steel, with slightly higher strength than 15 × steel, little quenching and no tempering brittleness. It is generally used for bending, calendering, bending and hammering.
20 × seamless steel pipe
20 × seamless steel pipe
The welding performance of arc welding and contact welding is good, the thickness of gas welding is small, the shape is strict or the shape of complex parts is easy to crack. It is generally used to manufacture workpieces with low stress and high toughness requirements.
20 × seamless steel pipe material: high quality carbon structural steel
Brand: 20#
Standard: gb8162-2008 GB / t8163-2008 gb3087-2008
Heat treatment specification: normalizing, 910 ℃, air cooling. Metallographic structure: ferrite + pearlite.
Delivery status: delivery in non heat treatment or heat treatment (annealing, normalizing or high temperature tempering) status. If the delivery is required to be in heat treatment state, it shall be indicated in the contract, otherwise, it shall be delivered without heat treatment.
Hot rolling (extruding seamless steel tube): round tube blank → heating → piercing → three roll cross rolling, continuous rolling or extruding → stripping → sizing (or reducing) → cooling → blank tube → straightening → wall thickness inspection → hydrostatic test (or flaw detection) → marking → warehousing.
Cold drawing (rolling) seamless steel pipe: round tube blank → heating → piercing → heading → annealing → pickling → oiling (copper plating) → multi pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → wall thickness inspection → hydraulic test (flaw detection) → marking → warehousing. Shandong Dongfei metal material Co., Ltd. mainly produces: seamless pipe brand: 10 × 20 × 35 × 35 × 45 × 16Mn 20g