â—Characteristics and application scope:
Cold deformation high plasticity, general for bending, rolling, bending and hammer arch processing, arc welding and contact welding welding performance is good, gas welding, the thickness is small, the appearance of strict 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.
â— Chemical composition:
Carbon C: 0.17 to 0.23 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
â—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
â— Heat Treatment Specification and Metallographic Organization:
Heat treatment specifications: normalizing, 910°C, air cooling. Metallographic structure: ferrite + pearlite.
â—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.
20 # steel weight formula: [(outer diameter - wall thickness) * wall thickness] * 0.02466 = kg / meter (weight per meter)
Steel pipe weight formula For example: [(68-4)*4]*0.02466*1=6.31296 (kg/m)
This pipe knowledge is provided by.
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