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661 High Alloy and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:High Alloy: 661

Category	Type	Steel Grade
Steel Grades	High Alloy	661
		S35500
		635
		650
		651
		S63198
		652
		S63199
		653
		660
		S66286

Chemical composition(mass fraction)(wt.%) of the 661

C ≤	Si ≤	Mn ≤	P ≤	S ≤	Cr	Ni
0.12	0.70	1.50			20.75	19.85
Mo	Al	Cu	Nb	Ti	V	Ce
2.95
N	Co	Pb	B	Other	Approximate rnumbe
0.13	19.50			Fe... W 2.35 Nb/Ta 1.15	N-155

Mechanical Properties of steel grade 661

Yield R_p0.2 (MPa)	Tensile R_m (MPa)	Impact KV/Ku (J)	Elongation A (%)	Reduction in cross section on fracture Z (%)	As-Heat-Treated Condition	Brinell hardness (HBW)
337 (≥)	322 (≥)	43	33	31	Solution and Aging, Annealing, Ausaging, Q+T,etc	143

Physical Properties of steel grade 661

Temperature (°C)	Modulus of elasticity (GPa)	Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and	Thermal conductivity (W/m·°C)	Specific thermal capacity (J/kg·°C)	Specific electrical resistivity (Ω mm²/m)	Density (kg/dm³)	Poisson’s coefficient, ν
34	-	-			0.31	-
826	225	-	21.3	132		-
556	-	44	13.2			222	221

Heat Treatment of steel grade 661

Heat treated : 1139°C - 1929°C

Technological Curves of steel grade 661

No Curve

Cross Reference Table (Equivalent Grade) of 661

Grade	Standard	Country	Application
AISI 661	AISI	USA	precipitation hardening
Austenitic 661		China	CNS standard heat resistant steel bars(CNS 9608-1998)
STR661			KS standard austenitic heat resistant steel
Austenitic 661		China	China Taiwan Heat-Resistant Steel

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Rfq.: sales@longhaisteel.com

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661