36CrNiMo4/1.6511/SNCM439/EN24 Alloy Steel

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36CrNiMo4/1.6511/SNCM439/EN24 Alloy Steel

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

Chemical composition

ASTM A2943400.38-0.430.15-0.350.6-0.8≤ 0.035≤ 0.040.7-0.9
EN1025036CrNiMo40.32-0.4≤ 0.40.5-0.8≤ 0.035≤ 0.0350.9-1.2
BS 970EN240.36-0.440.1-0.40.45-0.7≤ 0.035≤ 0.041.0-1.4
JIS G4103SNCM4390.36-0.430.15-0.350.6-0.9≤ 0.03≤ 0.030.6-1.0
GB 307740CrNiMoA0.37-0.440.17-0.370.5-0.8≤ 0.025≤ 0.0250.6-0.9

Equivalent Grades of Steel 36CrNiMo4(1.6511)




Description of Steel 36CrNiMo4(1.6511)

36CrNiMo4 / 1.6511 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.

Size Tolerance

Surface FinishSize ToleranceLength
Black For Forged condition(0,+5mm)Multiple Length/Fixed Length
Black For Rolled condition(0,+1mm)
Rough Turned(0,+3mm)

Mechanical properties of Steel 36CrNiMo4(1.6511)

Tensile Strength:min. 740 N/mm2

Yield Strength:min. 540N/mm2


Kv-Imapct value:min.48J (l)

Heat Treatment Conditions

Heat Treatment ProcessTemperature RangeCooling Method
Normalizing850-880°CCooling in air
Soft Annealing830-850°CFurnace cooling to 610℃ at a rate of 11℃ per hour, finally air cooling
Stress Relieving600-650°CCooling in air
Hardening830-865°COil quench
Tempering450-660°CCool in still air


Product TypeMaterial GradesSpecification
Hot-Rolled Bars36CrNiMo4, 1.6511, 36HNMN/A
Forgings/Rings/Bars36HNM, 36CrNiMo4, 1.6511N/A


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