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20NiCrMo13-4 1.6660 Case Hardening Steels

20NiCrMo13-4 1.6660 Case Hardening Steels

20NiCrMo13-4 1.6660 Case Hardening Steels

20NiCrMo13-4 1.6660 Case Hardening Steels

1. 1.6660 Application

• Gears subjected to high stresses, diverse parts subject to wear and fatigue in service.
• In the quenched and tempered condition: safety-critical parts.

2. 1.6660 Characteristics

• High mechanical properties.
• Good fatigue strength.
• After carburising, quenching and tempering, the surface hardness is around 730 HV.
• Good toughness of the carburised layer.
• For some carburising applications, oil quenching can be replaced with gas pressure quenching in order to minimise distortion due to the heat treatment.

3.All Grades Comparison

DIN EN
1.6660 20NiCrMo13-4

4.Quality Standard

EN 10084 2008 Case hardening steels

5. 1.6660 Chemical Composition(%)

C Mn Si P S Cr Ni Mo
0.17-0.22 0.30-0.60 0.40 max 0.025 max 0.035 max 0.80-1.20 3.00-3.50 0.30-0.50

6.Hardness requirements for products delivered in the conditions

Process Hardness
treated to improve shearability 277HB max
soft annealed 255HB max
treated to hardness range 207HB-255HB
treated to ferrite-pearlite structure and hardness range 197HB-241HB

7.Conditions for heat treating test bars and treatment of the steels:

Process Temperatures (oC)
End quench test 850
Carburizing 880-980
Core-hardening 825-880
Case-hardening 800-850
Tempering 150-250

8.Mill′s test certificate:

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.

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Founded in 1998, FuShun covers an area of 3000 square meters, annual sales volume of 20000 tons. We are engaged in the manufacture and export of Tool Steel, Nickel Alloy, Stainless Steel and other special steel products…,View more content About Me.

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