20nicrmo13-4 1.6660 Case Hardening Steels

• Type: Round
• Standard: DIN, BS
• Composition: Ferrous Steel Scrap
• Technique: Hot Forged,or Hot Rolled
• Shape: Round,Flat or Square
• Surface Treatment: Polished
• Model NO.: 20NiCrMo13-4 1.6660
• Special Use: Safety-Critical Parts
• Application: Structural Steel Bar
• Transport Package: Seaworth Packing
• Specification: Round Bar: Dia12~420mm Flat Bar: 2~420 X 30~1500mm
• Trademark: CHENGQUAN
• Origin: Huangshi, Hubei
• HS Code: 7228100000
• Production Capacity: 5000tons/Year

Product Description

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

DIN	EN
1.6660	20NiCrMo13-4

Quality StandardEN 10084 2008 Case hardening steelsChemical 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

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

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

Mill′s test certificate:EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.