GH698

HuaNickel GH698 is a Ni-Cr-based precipitation hardening deformed superalloy with a service temperature of 750°C~800°C. The alloy is developed on the basis of GH4033 alloy, compared with GH4033 alloy, the aluminum and titanium content is increased, niobium and molybdenum are added, and the chromium content is reduced. The alloy has high lasting strength and tensile strength, good plasticity and comprehensive properties in the range of 550°C~800°C, and long-term structural stability. It is suitable for making long-life heavy-bearing parts such as engine turbine discs and compressor discs.

GH698 Chemical composition：

	Ni	Cr	Mo	AI	Ti	Nb	C	B	Zr	Mn	Si	P	S
Min	Bal	13	2.8	1.3	2.35	1.8	≤
Max		16	3.2	1.7	2.75	2.2	0.08	0.005	0.06	0.4	0.6	0.015	0.007

GH698 Physical properties：

Density	8.19g/cm3
Melting point	1340~1365℃
Magnetic properties	not

Specific heat capacity

θ/℃	20	100	200	300	400	500	600	700	800
Ed/GPa	223	219	213	207	201	194	187	179	170
G/GPa	80	79	79	81	79	77	73	70	66
μ	0.40	0.39	0.38	0.30	0.30	0.31	0.31	0.32	0.28

GH698 Mechanical properties：

Standard number	Variety	Heat treatment	Tensile properties					Room temperature performance		Long-lasting performance
			θ/℃	σb	σp0.2	δ₅	ψ	Aku/J	HBS	θ/℃	σ/MPa	τ/h
				MPa		%
				≥								≥
GJB 3782 GIB 5280	Forged round cakes Disc forgings	Standard heat treatment	20	1120	705	17	19	39	341～285	750	412	50
											363	100
Q/GYB05011 Q/GYB 666 Q/GYB 665	Hot rolled and forged wrought round cakes	System I	20	1180	736	14	16	39.2	363～302	650	706	50
		systemⅡ		1130	705	17	19	49.1	363～302
Q/GYB 05033	Fasteners with bars	systemⅡ	20	1130	705	17	19	39	341～293		一	—
			750	740		5	8	一		750	412	50

GH698 Alloy properties：

After long-term aging at 650°C~750°C, 100h~1000h, GH698 alloy has stable structure and properties, and not harmful phase precipitation.

GH698 Uses of alloys：

GH698 alloy is widely used in the manufacture of important load-bearing parts such as turbine discs, compressor discs, deflectors, and load-bearing rings of aero engines.

GH698 Process performance：

Heat treatment:HuaNickel  GH698 superalloy adopts the heat treatment system of solid solution + aging, and the alloying elements are fully dissolved by controlling the heating temperature and time to achieve the best strengthening effect. In the process of heat treatment, the heating rate and cooling rate should be strictly controlled to avoid cracks, deformation and other phenomena.

Relevant standards：

GJB 3782 、GJB 5280、HB 5285、GH698、HB/Z140 、Q/GYB 05011 GH698、Q/GYB 05025 GH698 Q/GYB 05033、GH698 、Q/GYB 665 、GH698 、Q/GYB666 、GH698、Q/GYB667、GH698