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SAE4320 637M17 DIN1.5714 16NiCr4 Special Alloy Case Hardening Steels

SAE4320 637M17 DIN1.5714 16NiCr4 Special Alloy Case Hardening Steels hardening steels SAE4320 637M17 DIN1.5714 16NiCr4 Special Alloy Case Hardening Steels SAE4320 637M17 DIN1

SAE4320 637M17 DIN1.5714 16NiCr4 Special Alloy Case Hardening Steels

All Grades Comparison:

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DIN Material No. AFNOR SAE BS
16NiCr4 1.5714 16NC6 4320 637M17

Quality Standard:

BS EN 10084 2008 Case hardening steels

Chemical Composition(%)

C Mn Si P S Cr Ni
0.13-0.19 0.70-1.00 0.40 max 0.025 max 0.035 max 0.60-1.00 0.80-1.10

Mechanical Properties(values obtained on test blanks after core hardening + stress-relieving)

Test Blanks Diameter(mm) Tensile Strength (Mpa) Yield Strength (Mpa) Elongation (longitudinal) (%) Impact 20°C (J) Hardness (HB)
11mm 1080-1470 835 min 9 min 30 min 327-417
30mm 830-1130 590 min 10 min 32.5 min 249-339

HEAT TREATMENT AND HOT PLASTIC DEFORMATION TEMPERATURES

Process TEMPERATURE ° C Cooling Medium
Hot Forming 900-1150 air
Normalizing 870 min air
Soft Annealing 700 min air 217HB max
Carburising 870-950 /
Core hardening 840-880 oil-polymer salt bath
Carbonitriding 750-930 gas
Isothermal annealing 860 min cooling to 650, then air (HB 166-217)
Case hardening 810-840 oil-polymer salt bath
Tempering 150-200 /