17CrNiMo6/1.6587

17CrNiMo6/1.65827 Steel is is a heat treatable, low alloy steel containing nickel, chromium and molybdenum as per DIN Germany standard which is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength.

Chemical Composition

GRADE	C	Si	Mn	P	S	Cr	Mo	Ni
17CrNiMo6/1.6587	0.15-0.20	≤ 0.40	0.40-0.60	≤ 0.035	≤ 0.035	1.50-1.80	0.25-0.35	1.40-1.7

Heat Treatment

Heat Treatment Process	Temperature Range	Holding Time	Cooling Method	Maximum Hardness
Normalizing	Nominal: 840-890°C	Several hours (N/A)	Cooling in air	N/A
Annealing	Nominal: 630-650°C	N/A	Cool slowly in furnace	229 HB
Hardening & Tempering (QT)	Nominal Hardening temperature: 830-865°C	N/A	Quench in oil	N/A
	N/A	N/A	Tempering as soon as possible when the temperature low to ambient temperature	N/A
	N/A	N/A	Heat the steel carefully to a suitable temperature selected by reference to a tempering chart or table	N/A
	N/A	N/A	The usual tempering temperature is 600°C which depending on the actual requirements	N/A
	N/A	N/A	Keep the material out of the furnace, then cool in air	N/A

Mechanical Properties

Tensile strength: 980-1270MPa
Yield point: 780MPa
3.Percentage reduction of area after fracture: 40%
4.Elongation after fracture: 11%
5.Impact test (+20°C):  Longitud – 45~50J

Application

It is used for gearbox gear, aero-engine bearing, precision instrument, precision spindle bearing, etc., can also be used for gear application with large loads.