GB/T 8162 20Cr seamless steel pipe as one of the mainly product in Katalor, we keep exporting GB/T 8162 20Cr seamless steel pipe more than 40,000 ton every year. Then Katalor will introduce the more information of GB/T 8162 20Cr seamless steel pipe.
1. GB/T 8162 20Cr seamless steel pipe is a seamless steel pipe for structure, mainly used for general structure and mechanical structure. Specific contents as following:
(1) Mostly used for the manufacture of carburized parts (oil quenching) with high core strength requirements, wear on the surface, cross-section below 30mm or complex shape and low load, such as: machine gearbox gears, gear shafts, cams, worm, piston pin, claw clutch, etc.;
(2) For parts with small heat treatment deformation and high wear resistance, high-frequency surface quenching should be carried out after carburizing, such as gears, shafts, spline shafts with modulus less than 3;
(3) This steel can also be used in quenched and tempered condition to manufacture parts with high working speed and moderate impact load;
(4) This steel can also be used as a low carbon martensitic quenching steel.
2. Mechanical properties: tensile strength σb (MPa): ≥ 835 yield strength σs (MPa): ≥ 540 elongation δ5 (%): ≥ 10 area shrinkage ψ (%): ≥ 40, impact absorption work Ak (J) ≥47 hardness: Annealing or high temperature tempering supply state hardness ≤ 156HB, sample size: sample size 15mm.
3. Heat treatment specifications and metallographic organization:
Heat treatment specification: quenching temperature (°C) for the first time 880, second time 780 to 820, coolant water and oil. Tempering temperature (°C) 200, coolant water, empty.
4. welding performance:
GB/T 8162 20Cr steel pipe is pearlite, which can be welded. GB/T 8162 20Cr steel pipe has good weldability. Generally, no heat treatment is needed after welding. GB/T 8162 20Cr steel pipe with thickness greater than 15mm need to be preheated to 100~150°C before welding. Preheating, or tempering heat treatment after welding.
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