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#684

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

Datasheet for: Steel Grades:High Alloy: 684

Category	Type	Steel Grade
Steel Grades	High Alloy	684
		670
		R30605
		671
		R30816
		680
		N06002
		681
		682
		683
		N07041

Chemical composition(mass fraction)(wt.%) of the 684

C ≤	Si ≤	Mn ≤	P ≤	S ≤	Cr	Ni
0.10	0.10	0.10			17.50	...
Mo	Al	Cu	Nb	Ti	V	Ce
4.25	3.00			3.00
N	Co	Pb	B	Other	Approximate rnumbe
	18.45		0.005	Fe0.50	U500

Mechanical Properties of steel grade 684

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)
116 (≥)	359 (≥)	14	42	31	Solution and Aging, Annealing, Ausaging, Q+T,etc	344

Physical Properties of steel grade 684

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
44	-	-			0.13	-
341	244	-	24.3	222		-
412	-	14	13.2			123	114

Heat Treatment of steel grade 684

Heat treated : 1313°C - 1222°C

Technological Curves of steel grade 684

No Curve

Cross Reference Table (Equivalent Grade) of 684

Grade	Standard	Country	Application
AISI 684	AISI	USA	precipitation hardening
GH738(GH684)		China	wrought Fe/Ni-base superalloy

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684