35crmo alloy structural steel

35CrMo is the specification number of alloy structural steel (alloy quenched and tempered steel), which is mainly used to manufacture important parts in various machines that are subjected to impact, bending and torsion, and high loads.

35CrMo alloy structural steel (alloy quenched and tempered steel)
Executive standard: GB/T3077-2015
Italy: 35crmo4
NBN: 34crmo4
Sweden: 2234
Japanese standard: SCM432/SCCrM3

35CrMo chemical composition:
Carbon C: 0.32 to 0.40
Silicon Si: 0.17～0.37
Manganese Mn: 0.40～0.70
Sulfur S: allowable residual content ≤ 0.035
Phosphorus P: Allowable residual content≤0.035
Chromium Cr: 0.80～1.10
Nickel Ni: Allowable residual content ≤ 0.30
Copper Cu: allowable residual content ≤ 0.30
Molybdenum Mo: 0.15～0.25

35CrMo mechanical properties:
Tensile strength σb (MPa): ≥985(100)
Yield strength σs (MPa): ≥835(85)
Elongation δ5 (%): ≥12
Area shrinkage ψ (%): ≥45
Impact energy Akv (J): ≥63
Impact toughness value αkv (J/cm²): ≥78(8)
Hardness: ≤229HB
Sample size: sample blank size is 25mm

35CrMo strength properties:

35CrMo alloy structural steel has high static strength, impact toughness and high fatigue limit, higher hardenability than 40Cr, high creep strength and lasting strength at high temperature, long-term working temperature up to 500 ℃; cold When deformed, the plasticity is medium, and the weldability is poor.

Low temperature to -110 degrees Celsius, and has high static strength, impact toughness and high fatigue strength, good hardenability, no overheating tendency, small quenching deformation, acceptable plasticity during cold deformation, medium machinability, but some The first type of tempering brittleness is not good in weldability. It needs to be preheated to 150~400 degrees Celsius before welding, and post-weld heat treatment to eliminate stress. Generally, it is used after quenching and tempering treatment. Use after tempering at medium temperature.

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