20 # material seamless pipe is made of steel ingot or solid tube perforation capillary, and then by hot-rolled, cold-rolled or cold dial made. Mainly divided into: fluid with seamless steel tubes, structural seamless steel tubes and boiler tubes. Mainly used for: conveying water, oil, gas and other fluids, machining and so on. 20 # material seamless tube theory formula: weight per meter = (outer diameter - wall thickness) * wall thickness * 0.0246620 # material seamless steel tube material: high quality carbon structural steel grade: 20 steel standard: GB / T8162- 2008, GB / T8163-2008, GB / T3087-2008, GB / T9948-2006, GB / T5310-2008 strength slightly higher than the 15 steel, rarely quenching, no temper brittleness. High cold deformation plasticity, generally for bending, rolling, bending and hammer arch processing, arc welding and welding properties of the welding, gas welding, the thickness of small, demanding or complicated shape parts of the shape of the crack. Machinability Cold drawn or normalized state is better than the annealed state, generally used to create less stressed and toughness demanding. ◠Chemical composition: Carbon C: 0.17 ~ 0.24 "Silicon Si: 0.17 ~ 0.37 Manganese Mn: 0.35 ~ 0.65 Sulfur S: ≤0.035 Phosphorus P: ≤0.035 Chromium Cr: ≤0.25 Nickel Ni: ≤0.25 Cu Cu: ≤0.25 ◠Mechanics Performance: Tensile strength σb (MPa): ≥ 410 (42) Yield strength σs (MPa): ≥ 245 (25) Elongation δ5 (%): ≥ 25 Reduction of area ψ (% Not heat treatment, ≤ 156HB, sample size: sample size 25mm ◠Heat treatment and microstructure specifications: heat treatment norms: normalizing, 910 ℃, air-cooled microstructure: ferrite + pearlite ◠delivery status: Non-heat treatment or heat treatment (annealing, normalizing or tempering) state delivery requirements of the state of the heat treatment delivery should be specified in the contract, not specified as non-heat treatment delivery. , to learn more about the relevant knowledge:
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