Product

China 36CrNiMo4-Alloy steel

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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.

Reference standard

  • 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

Application

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.

Chemical composition

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

Equivalent Grades

EU Germany Japan France England China Russia Inter
EN DIN,WNr JIS AFNOR BS GB GOST ISO
36CrNiMo4 36CrNiMo4 SCNM439 40NCD3 817A37

817M37

36CrNiMo 40KHN2MA 36CrNiMo4

Size Tolerance

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)

Mechanical properties

  • Tensile Strength:min. 740 N/mm2
  • Yield Strength:min. 540N/mm2
  • Elongation:min.10%(l)
  • Kv-Imapct value:min.48J (l)

Heat Treatment Conditions

  • +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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