GH37

HuaNickel  GH37 is a nickel-based superalloy composed of elements such as Ni-Cr. The alloy has high thermal strength, good comprehensive properties and microstructure stability. It is suitable for manufacturing gas turbine working blades with a working temperature of 800°C~850°C

GH37 Chemical composition：

	Ni	C	Cr	W	Mo	AI	Ti	V	Cu	Fe	B	Ce	Mn	Si	p	S
Min	Bal	0.03	13	5	2	1.7	1.8	0.1	≤
Max		0.1	16	7	4	2.3	2.3	0.5	0.07	5	0.02	0.02	0.5	0.4	0.015	0.01

GH37 Physical properties：

Density	8.40g/cm³
Melting point	1278℃~1346℃
Magnetic properties	not

Coefficient of linear expansion

θ/℃	20～100	20～200	20～300	20～400	20～500
α/(10-6℃-1)	11.27	12.71	13.24	13.50	14.00
θ/℃	20～600	20～700	20～800	20～900
α/(10-⁶ ℃-1)	14.48	15.10	15.74	16.67

Resilient performance

θ/℃	20	100	200	300	400	500	600	700	800	900
Ed/GPa	220	218	213	204	197	193	183	175	167	155
E/GPa	196	—	一	—		—	162	147	142	127

GH37 Mechanical properties：

Standard name	Variety	state	θ/℃	Tensile properties			Long-lasting performance		Room temperature hardness HBS
				σb/MPa	δ₅/%	ψ/%	σ/MPa	τ/h
				≥				≥
GB/T 14993 GJB 1953A	Hot rolled rods	Standard heat treatment	800	665	5.0	8.0	196	50	341～269
			850	—	——		(245)	(100)
HB 5198			800	665	6.0	10.0	196	50
			850				(245)	(100)

GH37 Alloy properties：

When the w(C) in HuaNickel GH37 alloy is 0.02%~0.06%, the performance of high-carbon alloy is better than that of low-carbon alloy. When w(C) is 0.05%~0.06%, the alloy has good comprehensive properties; When w(C) is higher than 0.06%, the alloy is prone to form a band-like structure with uneven coarse and fine grains. The phenomenon of leaf blank falling during machining is related to the content of silicon in the alloy. The alloy has a certain notch sensitivity around 700°C.

GH37 Uses of alloys：

GH37 alloy has been used in the manufacture of aero engine turbine working blades, which has been tested by long-term use and has good performance

GH37 Process performance：

Heat treatment:

Solution treatment:HuaNickel GH37 nickel alloy is heated to austenitic temperature and maintained at this temperature for a period of time to fully dissolve the alloying elements in the austenite matrix. It is then rapidly cooled to room temperature to allow the austenite to transition to an age-hardening state. Solution treatment can eliminate the stress in GH37 nickel alloy and improve its plasticity and toughness.

Aging treatment: GH37 nickel alloy is heated to a low temperature tempering temperature, and maintained at this temperature for a certain period of time, so that the alloying elements are precipitated in the matrix and the matrix structure is strengthened. Aging treatment can improve the high-temperature strength and durability of GH37 nickel alloy, but it will also reduce its plasticity and toughness. According to the actual needs, different aging temperatures and times can be selected to obtain the best comprehensive performance.

Relevant standards：

GB/T 14993、GJB1953A、HB 5189、HB/Z140