Project Description

16NiCr4 is a low carbon case hardening steel which has at least 0.6Cr%,0.8%Ni as strengthening elements.It has a low-medium hardenability with good core resistance up to a thickness of about 50 mm,and had good machinability in the annealed condition.16NiCr4 is generally supplied in annealed condition with  Max hardness 217HB.

16NiCr4 rolled bar

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

16NiCr4/1.57140.13-0.19≤ 0.40.7-1.00.6-1.00.8-1.1≤ 0.025≤ 0.035
16NiCrS4/1.57150.13-0.19≤ 0.40.7-1.00.6-1.00.8-1.1≤ 0.0250.02-0.04

3.Relevant Standards


4. Mechanical Property

Size - mm<1111-2525-4040-60
Tensile Strength, N/mm²1080-1470880-1195785-1080735-980
Yield Strength, N/mm²>835>640>590>540
Elongation (%)>9>10>10>11
Impact 20°C,J>30>32.5>32.5>32.5


16NiCr4 forging temperature:900 – 1150°C,cooled as slowly as possible in still air or in sand after forged.

6.Heat Treatment

  • Normalizing:  870 – 890°C,Cooling in air
  • Soft Annealing:680 – 720°C,Cooling in furnace
  • Carburizing:880-980°C
  • Core-hardening:850-890°C,oil-polymer salt bath
  • Case-hardening:780-820°C,oil-polymer salt bath
  • Carbonitriding:860-930°C/Gas
  • Tempering:150-200°C

7.Surface Hardness

  • Treated to improveshearability(+S):Max 255HB
  • Soft annealed(+A):Max 217HB
  • Treated to hardness range(+TH):166-217HB
  • Treated to ferrite-pearlite structure and hardness range(+FP):156-207HB
TypeDistance mm1.535791113152025303540

HRC Min393633292725232220----
HRC Max47464442403836343230292828

HRC Min42393733312927262422212020
HRC Max47464442403836343230292828

HRC Min393633292725232220----
HRC Max44434038363432302826252424


16NiCr4 is a case-hardening steel widely used for high-strength core parts, structural parts subject to abrasion and variable loads typically used for small-sized parts, such as loaded gears, screws, pins, shafts, pivots, machine parts, cars and engines

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