Project Description

17NiCrMo6-4 is a low carbon case hardening steel which has at least 0.8Cr%,1.2%Ni and 0.15%Mo as strengthening elements as per EN10084 standard.It is used for parts with a required core tensile strength of 1000 – 1300 N/mm² ,great surface hardness and also good wearing resistance.17NiCrMo6-4 is generally supplied in annealed condition with Max hardness 229HB.

17NiCrMo6-4 steel

1.Supply Form & Size & Tolerance

Hot rolled bar:Φ6-Φ130mm,Length:3000-10000mm

Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm

Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm

Surface FinishBlack-Forged Black-Rolled Turned   GrindingPolishedPeeledCold Drawn
Tolerance(0,+5mm)(0,+1mm)(0,+3mm)Best h9Best h11Best H11Best H11

2.Chemical Composition

17NiCrMo6-4/1.65660.14-0.2≤ 0.40.6-0.90.8-1.11.2-1.50.15-0.25≤ 0.025≤ 0.035
17NiCrMoS6-4/1.65690.14-0.2≤ 0.40.6-0.90.8-1.11.2-1.50.15-0.25≤ 0.0250.02-0.04

3.Relevant Standards

815M1718NiCrMo518NCD6 SS2523

4. Mechanical Property

Hardening at 850°C,Tempering at 200°C
Size - mm<1616-4040-100
Tensile Strength, N/mm²>1200>1000>900


17NiCrMo6-4 forging temperature:950 – 1200°C,cooled as slowly as possible in the furnace or in sand after forged.

6.Heat Treatment

  • Normalizing:  870 – 890°C,Cooling in air
  • Soft Annealing:650 – 700°C,Cooling in furnace
  • Carburizing:880-980°C
  • Core-hardening:830-870°C,oil-polymer salt bath
  • Case-hardening:780-820°C,oil-polymer salt bath
  • Tempering:150-200°C

7.Surface Hardness

  • Treated to improveshearability(+S):Max 255HB
  • Soft annealed(+A):Max 229HB
  • Treated to hardness range(+TH):179-229HB
  • Treated to ferrite-pearlite structure and hardness range(+FP):149-201HB
TypeDistance mm1.535791113152025303540

HRC Min404037343028272624232221-
HRC Max48484746454442413836353433

HRC Min43434038353332312927262524
HRC Max48484746454442413836353433

HRC Min404037343028272624232221-
HRC Max45454442403937363332313029


17NiCrMo6-4 is widely used in automotive, chemical / petrochemical, earthmoving / agriculture industry,typical application:boxes, piston bolts, spindles, camshafts, gears, shafts and other mechanical controlling parts,especially in wheels and stopcock.

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