Steel pipe knowledge: 20 # seamless steel pipe for low carbon steel

20# seamless steel tubes are low carbon steel tubes. Carbon steel is generally divided into low carbon steel, medium carbon steel, and high carbon steel. 45# steel is medium carbon steel, and 45# is low carbon steel. 45# is a high carbon steel. If there is no special requirement for seamless steel pipes, 20# seamless steel pipes are used.
20 # seamless steel pipe material is 20 # steel, the strength is slightly higher than 15 #, rarely quenching, no temper brittleness. Cold deformation high plasticity, general for bending, rolling, crimping and hammer arch processing, arc welding and contact welding welding performance, gas welding thickness is small, strict shape or complex shape of the parts are prone to cracking. Machinability Cold drawing or normalizing is better than annealing. It is generally used for manufacturing with low stress and high toughness requirements.
The material of 20# seamless steel pipe is: High-quality carbon structural steel Grade: 20 Steel Standard: GB8162-2008
GB/T8163-2008
GB3087-2008
GB9948-2006
GB5310-2008
chemical composition:
Carbon C: 0.17 to 0.2 Silicon Si: 0.17 to 0.37 Manganese Mn: 0.35 to 0.65 Sulfur S: ≤ 0.035 Phosphorus P: ≤ 0.035 Chromium Cr: 0.25 Nickel Ni: 0.25 Copper Cu: 0.25
Mechanical properties:
Tensile strength σb (MPa): ≥410 (42) Yield strength σs (MPa): ≥ 245 (25) Elongation δ5 (%): ≥25 Section shrinkage ψ (%): ≥ 5, Hardness: Not treated , ≤156HB, sample size: sample size 25mm
Heat Treatment Specification and Metallographic Organization:
Heat treatment specifications: normalizing, 910°C, air cooling. Metallographic structure: ferrite + pearlite.
Delivery status: Delivery with no heat treatment or heat treatment (annealing, normalizing, or high temperature tempering). The requirements for the delivery of heat treatment shall be specified in the contract, and those not specified shall be delivered without heat treatment.
The seamless pipe knowledge is published.