GH2903

HuaNickel GH2903 alloy is a high-strength, high-hardness nickel-based alloy, mainly composed of nickel, chromium, molybdenum and other elements, with good oxidation resistance and corrosion resistance. The alloy has high strength, good resistance to cold and heat fatigue, welding performance and resistance to high-pressure hydrogen embrittlement. The alloy is an ideal material for engine clearance control technology, which can improve engine efficiency and reduce fuel consumption.

GH2903 Chemical composition：

	Fe	Ni	Co	AI	Ti	Nb	B	Mn	Si	S	P	Pb	Sb	Sn
Min	Bal	36	14	0.7	1.35	2.7	0.005	≤
Max		39	17	1.15	1.75	3.5	0.01	0.2	0.2	0.015	0.015	0.001	0.025	0.0012

GH2903 Physical properties：

Density	8.23 g/cm3
Melting point	1318℃~1393℃

Resistivity

θ/℃	20	100	200	300	400
p/(10-*Ω·m)	0.701	0.835	1.017	1.173	1.291
0/℃	500	600	700	800	—
p/(10-⁶Ω·m)	1.350	1.387	1.400	1.379

Coefficient of linear expansion

θ/℃	20～100	20～200	20～300	20～400
α/(10-6℃-1)	9.1	8.6	8.5	8.3
θ/℃	20～500	20～600	20～700	20～800
α/(10-6℃-I)	9.3	10.4	11.3	13.0

Resilient performance

θ/℃	20	100	200	300	400
Ed/GPa	165	164	163	162	161
θ/℃	500	600	700	800	900
Ed/GPa	159	158	156	144	141

GH2903 Mechanical properties：

Standard number	Variety	Heat treatment	Room temperature performance					650℃Long-lasting performance
			σb/MPa	σpo.2/MPa	δ₅/%	ψ/%	HBS	σ/MPa	τ/h	δ₅/%	ψ/%
GJB 5261	Hot rolled and forged bars	standard heat treatment	≥1130	≥880	≥8.0	≥25.0	415～341	490	≥100
HB 6574	Rings and rings		≥1130	≥880	≥8.0	≥25.0	415～341	490	≥100	Measured	Measured

GH2903 Alloy properties：

Antioxidant performance: It has excellent antioxidation performance at high temperature (usually more than 700°C), which can effectively resist the erosion of oxides in the air on the surface of the material and prolong its service life.

High temperature corrosion resistance: Under high temperature and high pressure, GH2903 alloy can resist the erosion of hot gas, water vapor and other corrosive media, so it is especially suitable for the manufacture of gas turbines and aero engines and other components.

Sulfur oxide resistance: For the environment of sulfur-containing fuels, HuaNickel GH2903 alloy also shows good corrosion resistance, which can resist sulfide corrosion and maintain the stability and reliability of the material.

Chemical corrosion resistance: GH2903 alloy also has good corrosion resistance in general chemical media, and can resist the erosion of common acid-alkali solutions and salt water.

GH2903 Uses of alloys：

HuaNickel GH2903 alloy precision electronic instruments, meters and other fields have a wide range of applications. The alloy is also used in the manufacture of turbine casings, turbine outer rings, inner and outer rings of guides, and sealing rings for aviation and aerospace engines

GH2903 Process performance：

Welding process: GH2903 alloy has satisfactory welding performance and can be welded by a variety of methods.

Relevant standards：

GJB 5261、 HB6574、GH903、HB/Z140