688

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#688

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

Datasheet for: Steel Grades:High Alloy: 688

Category	Type	Steel Grade
Steel Grades	High Alloy	688
		681
		682
		683
		N07041
		684
		N07500
		685
		N07001
		686
		687

Chemical composition(mass fraction)(wt.%) of the 688

C ≤	Si ≤	Mn ≤	P ≤	S ≤	Cr	Ni
					15.00	73.00
Mo	Al	Cu	Nb	Ti	V	Ce
	0.80			2.50
N	Co	Pb	B	Other	Approximate rnumbe
				Fe 0.75 Nb/Ta 0.85	Inconel X-750

Mechanical Properties of steel grade 688

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)
693 (≥)	154 (≥)	23	32	34	Solution and Aging, Annealing, Ausaging, Q+T,etc	242

Physical Properties of steel grade 688

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
14	-	-			0.12	-
372	692	-	32.3	111		-
489	-	11	43.2			114	324

Heat Treatment of steel grade 688

Heat treated : 1848°C - 1472°C

Technological Curves of steel grade 688

No Curve

Cross Reference Table (Equivalent Grade) of 688

Grade	Standard	Country	Application
AISI 688	AISI	USA	precipitation hardening

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Rfq.: sales@longhaisteel.com

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688