China 36CrNiMo4-Alloy steel


China 36CrNiMo4-Alloy steel is defined as a heat treatable and low alloy steel which has 0.8% Cr, 0.2% Mo and 1.8% Ni as strengthening alloy elements.Compared with AISI 4140,it has higher strength and toughness,also it has very good fatigue resistance, wear resistance and atmospheric corrosion resistance.36CrNiMo4 / 1.6511 is generally supplied in hardened and tempered condition with the tensile range of 930 – 1080 Mpa ,hardness 280-320HB.Pre hardened and tempered 4340 can be further surface hardened by flame or induction hardening and by nitriding.

  • EN 10250-3: 2000 Open steel die forgings for general engineering purposes. Alloy special steels
  • EN 10297-1: 2003 Seamless circular steel tubes for mechanical and general engineering purposes. Non-alloy and alloy steel tubes. Technical delivery conditions

China 36CrNiMo4-Alloy steel is often used in preference to AISI 4140 at the higher strength levels because of its better hardenability and improved CVN impact toughness.Typical applications include:Heavy-duty axles, shafts, heavy-duty gears,spindles, pins, studs, collets, bolts, couplings,sprockets, pinions, torsion bars, connecting rods,crow bars, conveyor parts,forged hydraulic,forged steel crankshafts etc.

C Si Mn Ni P S Cr Mo
0.32 – 0.4 max   0.4 0.5 – 0.8 0.9-1.2 max   0.035 max   0.035 0.9-1.2 0.15-0.3
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36CrNiMo4 36CrNiMo4 SCNM439 40NCD3 817A37


36CrNiMo 40KHN2MA 36CrNiMo4
Surface Finish Size Tolerance Length
Black For Forged condition (0,+5mm) Multiple Length/Fixed Length
Black For Rolled condition (0,+1mm)
Rough Turned (0,+3mm)
  • Tensile Strength:min. 740 N/mm2
  • Yield Strength:min. 540N/mm2
  • Elongation:min.10%(l)
  • Kv-Imapct value:min.48J (l)
  • +A   Soft annealed/Soft annealing
  • +N   Normalized/Normalizing
  • +QT  Quenched and Tempered
  • +U   Untreated
  • +SR  Stress Relieved

Normalizing:850℃-880℃,Cool in air

Soft Annealing:830℃-850℃,furnace cooling to 610℃ at a rate of 11℃ per hour, finally air cooling.

Stress Relieving:600 °C – 650 °C,Cooling in air

Hardening:830℃-865℃,oil quench

Tempering:450℃- 660℃, cool in still air

Hot-rolled bars 36CrNiMo4, 1.6511, 36HNM

Forgings, forged rings and bars 36HNM, 36CrNiMo4, 1.6511

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