GH1140

 Hua Nickel GH1140 is a Fe-Ni-Cr-based solution-strengthened deformed superalloy with the addition of chromium, tungsten and molybdenum and other elements for solution strengthening, and the service temperature is below 850°C. The alloy has medium thermal strength, high plasticity, good resistance to cold and heat fatigue, microstructure stability and welding process performance. It is suitable for the manufacture of combustion chamber plates, structural parts and other high-temperature components of aero engines and gas turbines.

GH1140 Chemical composition：

	Fe	C	Cr	Ni	Mo	Ti	Al	W	Ce	Si	Mn	S	P
Min	Bal	0.06	20	35	2	0.7	0.2	1.4	≤
Max		0.12	23	40	2.5	1.2	0.6	1.8	0.05	0.8	0.7	0.015	0.025

GH1140 Physical properties：

Density		8.09g/cm³
Resistivity	20℃	1.07×10~⁶Ω·m”

Specific heat capacity

θ/℃	20～100	20～200	20～300	20～400	20～500
α/(10-6℃-1)	12.7	13.8	14.3	14.6	15.1
θ/℃	20～600	20～700	20～800	20～900	20～1000
α/(10-6℃-I)	15.4	15.8	16.3	16.7	17.5

GH1140 Mechanical properties：

Standard number	Variety	Heat treatment	Stretch at room temperature			Stretch at 800°C
			σb/MPa	δ₅/%	ψ/%	σb/MPa	δ₅/%	ψ/%
			≥
GJB 3317A	Hot rolled plate	standard heat treatment	635	40	45	245	40	50
GJB 1952A	Cold-rolled plate		635	40		225	40
GJB 3318A	Cold-rolled strip		635	40	—	—	—
GJB 3165A	Rods		615	40	45	245	40	50
GJB 3020A	Ring blanks		620	40	45	245	40	50
GJB 5301	Rings		620	40	45	245	40	50
GJB 3167	Cold drawing		≤735	40	—	—	——
GJB 2297A	Not seam tubes		635	40	—	225	40
GB/T 15062	Pipe		590	35			—

GH1140 Alloy properties：

The alloy hardens slightly after long-term use in the temperature range of 550°C~800°C, which reduces the plasticity at room temperature; Oxidation along grain boundaries occurs during long-term operation above 700°C and can be effectively protected with 65, 66-4, W-2 and W69-1 enamel coatings, or solid infiltrated Al and vacuum sprayed Al coatings. The overall properties of the alloy are higher than those of GH3030 alloy, but comparable to GH3039 alloy, which can be used as a substitute for these two alloys.

GH1140  Uses of alloys：

GH1140 alloy has been used in the manufacture of combustion chamber flame cylinders, afterburner diffusers, rectifier support plates, stabilizers, oil transfer rings, afterburner adjustable spout housings, pipe joints, bushings, and aircraft tail cover skins for a variety of aero engines and gas turbines.

GH1140  Process performance：

Welding process: Hua Nickel  GH1140 alloy can be joined by manual argon arc welding, automatic tungsten argon arc welding, tungsten pulse argon arc welding and spot welding, seam welding, brazing and other methods. Vacuum brazing, argon shielded brazing and flame brazing can be performed when the appropriate brazing metal is used. Cold-formed sheets are solution treated before TIG welding.

Heat treatment: solution temperature is 1080°C±10°C; Afterburner parts, solution temperature of 1150°C±10°C. The intermediate heat treatment temperature is 1050°C±10°C, and the solution temperature for relieving welding stress is 940°C or higher. After heat treatment, it can be air-cooled or water-cooled according to the shape of the part.

Relevant standards：

GB/T15062、GJB 1952A、 GJB 2297A、 GJB 2612、GJB 3020A、 GJB 5301 、GJB3165A  、GJB 3167  GJB 3317A 、 GJB3318A  、HB/Z140