GH40

HuaNickel GH40 is a Fe-Ni-Cr-based solution-strengthened deformed superalloy that is solution-strengthened and stabilized with an austenitic matrix of elements such as chromium and molybdenum. GH40 alloy has good heat resistance, corrosion resistance, good microstructure stability, good hot working plasticity, welding and cold forming Process performance。

GH40 Chemical composition：

	Fe	Cr	Ni	Mo	Si	Mn	N	C	P	S	Cu
Min	Bal	15	24	5.5	0.5	1	0.1	≤
Max		17.5	27	7	1	2	0.2	0.12	0.03	0.02	0.2

GH40 Physical properties：

Density

8.08g/cm³

Thermal conductivity

θ/℃	100	200	300	400	500
α/[W/(m·℃)]	12.6	14.7	16.3	18.4	20.1
θ/℃	600	700	800	900	——
α/[W/(m·℃)]	22.2	23.9	26.0	27.6

Resistivity

θ/℃	25	100	200	300	400
p/(10-⁵Ω·m)	0.905	0.974	1.01	1.06	1.10
θ/℃	500	600	700	800
p/(10-Ω·m)	1.13	1.15	1.1	1.20

Coefficient of linear expansion

θ/℃	α/(10~6℃-I)	θ/℃	α/(10-6℃-I)
20～100	14.4	20～800	18.2
20～200	15.5	20～900	18.5
20～300	16.1	100～200	15.4
20～400	16.5	200～300	16.5
20～500	17.0	300～400	17.6
20～600	17.4	400～500	18.2
20～700	17.8		——

GH40 Mechanical properties：

Sandard	Variety	Heat treatment	θ/℃	Tensile properties				hardness	Long-lasting performance
				σb/MPa	σp0.2/MPa	δ₅/%	ψ/%	HB	σ100 /MPa
GB/T 14994 GJB 2611A	Cold-drawn rods	1200℃×1h/AC +700℃×16h/AC	800	≥295
Rods		800℃×5h/AC	20					≥255
		1180℃×2h/WQ +700℃×5h/AC	700			—	—		175
Disc forgings		750℃Warm processing intensification 10%～15% +650℃×4h/AC	20	820	620	12	—	321～241	—
			700	—	—	—	—	—	196
			815	315	—	—	—	—

GH40 Alloy properties：

HuaNickel GH40 alloy is a carbide-strengthened material, and the carbide between the cast dendrites is not easy to break during forging, and there will be obvious dendritic structure left on the disc forging.

GH40 Uses of alloys：

GH40 alloy is used in the manufacture of welded rotors, shafts and fasteners for gas turbines, as well as short-working rocket engine parts. After the alloy is strengthened by temperature processing, it can be used to make turbine disks that operate below 650°C.

GH40 Process performance：

Welding process:HuaNickel  GH40 alloy has excellent weldability and can be reliably welded with other materials. It can obtain high-quality welded joints through common welding methods such as arc welding, argon arc welding, and electron beam welding. This opens up a wide range of possibilities for the application of GH104 alloy in assembly and manufacturing.

Heat treatment: Heat treatment of the machined GH40 alloy is carried out to improve the mechanical properties and structural stability of the material. Common heat treatment methods include solution treatment and aging treatment.

Relevant standards：

GB/T14992 、GB/T14994、GJB 2611A 、GJB 2612A 、YB/T 5247