GH38A

HuaNickel GH38Ais a Fe-Ni-Cr base superalloy that can be used at temperatures below 700°C. Elements such as aluminum and titanium are added to the alloy to form a precipitation-strengthening phase, and boron is added to purify and strengthen the grain boundaries. The alloy has high thermal strength when used below 700°C, as well as good cutting and welding properties.

GH38AChemical composition：

	Fe	Cr	Ni	Ti	C	B	Mn	Si	S	P
Min	Bal	10	18	2.3	≤
Max		12.5	21	2.8	0.1	0.008	1	1	0.02	0.03

GH38APhysical properties：

Density

7.94g/cm³

Thermal conductivity

θ/℃	100	200	300	400	500	600	700	800	900
α/[W/(m·℃)]	16.3	17.6	18.8	20.5	22.6	23.9	25.1	26.8	28.5

Coefficient of linear expansion

θ/℃	20～100	20～200	20～300	20～400	20～500	20～600	20～700	20～800
α/(10-6℃-1)	15.4	16.0	16.6	17.0	17.5	17.9	18.2	18.9
θ/℃	100～200	200～300	300～400	400～500	500～600	600～700	700～800	——
α/(10-6℃-I)	16.6	17.7	18.4	19.4	19.6	20.5	23.4

GH38AMechanical properties：

Standard number

Variety

Heat treatment

Room temperature performance

800℃ tensile properties

Long-lasting performance at 800°C

σb/MPa

σp0.2/MPa

δ₅/%

ψ/%

Ak/J

HBS

σ/MPa

τ/h

≥

≥

YB/T 5245

Hot rolled rods

Standard heat treatment

784

441

15

15

23.5

302～241

294

20

20

Choose

Measured

GH38AAlloy properties：

GH38Aalloy has lamellar Laves phase precipitation at grain boundaries after heat treatment.

GH38AUses of alloys：

HuaNickel GH38Aalloy is mainly used for hot end components such as turbine discs, combustion chamber housing parts, turbine housings, supports, shafts and blades below 700°C.

GH38AProcess performance：

Welding process:

Sampling/mm	Pre-weld heat treatment	θ/℃	Tensile properties				Impact performance
			σb/MPa	σp0.2/MPa	δ₅/%	ψ/%	Ak/J
D20 hot rolled rod Non-vacuum induction furnace + Electroslag	Not brazed	20	936	668	24.8	26.0	729～81
		8C0	349		35.5	73	78.4
		900	98	——	86.4～128	—	>226
	1180℃×25min/AC	20	941	611～645	17.0	17.1	54.9
		800	348	—	47.0	73～78	58.8
		900	117	—	80～115.2	—	>137
	1220℃×25min/AC	20	916	593	224～27.2	24.7	62.7
		800	353		37.2～49.2	75.5	74.5
		900	116		104～115.2		>216

Relevant standards：

GB/T14992 、YB/T 5245、HB/Z 140