Chemical composition and mechanical properties of 38CrMoAl steel plate

38CrMoAl is a high-grade nitrided steel with high wear resistance, high fatigue strength and high strength. It is mainly used for nitrided parts with precise dimensions after heat treatment, or various nitrided parts with little impact load and high wear resistance, such as boring bars, grinding machine spindles, automatic lathe spindles, worms, precision screw rods, precision gears, high-pressure valves, valve stems, gauges, templates, rollers, imitations, cylinder blocks, compressor piston rods, governors on steam turbines, rotating sleeves, fixed sleeves, various wear-resistant parts on rubber and plastic extruders, etc.

Characteristics and application of 38CrMoAl steel plate:
38CrMoAl steel has high surface hardness, wear resistance and fatigue strength, and has good heat resistance and corrosion resistance, and the hardenability is not high. It is used to make nitrided parts with high wear resistance, high fatigue strength and considerable strength, and high dimensional accuracy after processing, such as imitation, cylinder liners, gears, high pressure valves, boring bars, worms, grinding machine spindles, etc.

38CrMoAl steel chemical composition:
Carbon C: 0.35-0.42
Silicon Si: 0.20 to 0.45
Manganese Mn: 0.30-0.60
Sulfur S: allowable residual content ≤ 0.035
Phosphorus P: Allowable residual content≤0.035
Chromium Cr: 1.35-1.65
Aluminum Al: 0.70 to 1.10
Nickel Ni: Allowable residual content ≤ 0.30
Copper Cu: allowable residual content ≤ 0.30
Molybdenum Mo: 0.15-0.25
38CrMoAl density: 7.85g/cm3

Mechanical properties of 38CrMoAl steel:
Tensile strength σb (MPa): ≥980(100)
Yield strength σs (MPa): ≥835(85)
Elongation δ5 (%): ≥14
Area shrinkage ψ (%): ≥50
Impact energy Akv (J): ≥71
Impact toughness value αkv (J/cm2): ≥88(9)
Hardness: ≤229HB
Sample size: sample blank size is 30mm

Heat treatment specification and metallographic structure:
Heat treatment specifications: quenching at 940℃, water cooling, oil cooling; tempering at 640℃, water cooling, oil cooling.

Delivery status of 38CrMoAl steel plate: delivered in (normalized, annealed or high temperature tempered) or without heat treatment, the delivery status should be indicated in the contract.