GH99

HuaNickel GH99 is a Ni-Cr-based precipitation-hardening deformed superalloy. The alloy is solution strengthened with chromium, cobalt, tungsten and molybdenum. GH99 alloy has high thermal strength, stable structure, and satisfactory cold and hot processing forming and welding process performance. It is used in aerospace, petrochemical and other fields.

GH99 Chemical composition：

	Ni	Cr	Co	W	Mo	AI	Ti	C	Fe	Ce	Mg	Mn	Si	P	S
Min	Bal	17	5	5	3.5	1.7	1	≤
Max		20	8	7	4.5	2.4	1.5	0.08	2	0.02	0.01	0.4	0.5	0.015	0.015

GH99 Physical properties：

Density	8.47g/cm³
Melting point	1345℃~1390℃
Magnetic properties	not

Specific heat capacity

θ/℃	20	100	200	300	400	500	600	700	800	900	1000
c/[J/(kg·℃)]	543	552	562	572	582	595	612	638	674	726	812

Coefficient of linear expansion

θ/℃	20～100	20～200	20～300	20～400	20～500
α/(10-6℃-I)	12	12.4	12.8	13	13.7
θ/℃	20～600	20～700	20～800	20～900	20～1000
α/(10-6℃-1)	14.2	14.7	15.1	15.3	17.4

Resilient performance

θ/℃	20	100	200	300	400	500	600	700	800	900	950	1000
E/GPa	210				195	—		167	147	121		—
Ec/GPa	216				185			157	142	——
Ed/GPa	223	219	215	210	205	199	194	184	178	164	154	147
G/GPa	81	81	79	77	75	73	72	71	67	60	59	54
μ	0.37	0.37	0.36	0.37	0.36	0.36	0.35	0.3	0.33	0.36	0.31	0.36

GH99 Mechanical properties：

Standard number	Variety/mm	Heat treatment	θ/℃	Tensile properties		Long-lasting performance			HV	Grain size/grade
				σb/MPa	δ₅/%	σ/MPa	τ/h	δ₅/%
				≥			≥
GJB 1952A HB 5332	0.8～4.0 Cold-rolled plate	Supply status	20	≤1130	35		——	—	≤300	4grade or finer
			900	375	15	110	23	6	—	—
						98	30	10	——
		Supply status+900℃×5h/AC	900	295	23		—	—		——

GH99 Alloy properties：

Large-scale sheet structural parts made of this alloy can be used directly after solution treatment without ageing. No harmful phase was found after long-term aging of the alloy at 700°C~950°C.

GH99 Uses of alloys：

GH99 alloy has a wide range of applications in aerospace, petrochemical, energy and other fields.

GH99 Process performance：

Welding process:HuaNickel  GH99 alloy can be used for argon arc welding and seam welding. Cross lap welding has a crack tendency of < 15% and can be joined by manual TIG welding, automatic tungsten TIG welding, seam welding and spot welding. The surface to be welded by resistance welding must be pickled.

Heat treatment: The surface oil and other dirt should be cleaned before heat treatment, so as to avoid local corrosion of the surface during heat treatment. After heat treatment, the surface of the iron oxide scale can be cleaned by sand blowing method or with pickling solution containing hydrofluoric acid.

Relevant standards：

GB/T14992 、GJB1952A 、HB 5332  GH99 、HB 5333  HGH99、HB/Z140 、QJ/DT 0160018  GH99 QJ/DT 0160020  GH99 、QJ/DT 0160021  GH99