GH302

HuaNickel GH302 is a Fe-Ni-Cr-based precipitation-hardening deformed superalloy with a grade of K232 for casting. The alloy can be used for a long time at 700°C and for a short time at 850°C. The structure and properties of the alloy are stable, and it has good cold and hot processing forming properties. The main products are bars, plates and precision castings.

GH302 Chemical composition：

	Fe	Cr	Ni	W	Mo	AI	Ti	B	Zr	Ce	Mn	Si
Min	Bal	12	38	3.5	1.5	1.8	2.3
Max		16	42	2.8	2.5	2.3	2.8	0.01	0.05	0.02	0.6	0.6

GH302 Physical properties：

Melting point	1375℃
Density	8.09g/cm³

Specific heat capacity

θ/℃	200	300	400	500	600	700	800	900
c/[J/(kg·℃)]	440	456	461	477	515	549	595	620

Coefficient of linear expansion

θ/℃	20～100	20～200	20～300	20～400	20～500	20～600	20～700	20～800	20～900
α/(10-5℃-1)	15.8	15.0	14.9	15.2	15.4	15.6	16.0	16.3	16.6

Resilient performance

θ/℃		20	400	500	600	700	800	900
Ed/GPa	Rods	204	——		167	159	153	134
	Plate	195	175		162	155	149	136
G/GPa		77	68	65	63	60	56	52
μ		0.27	0.29	0.30	0.30	0.30	0.33	0.35

GH302 Mechanical properties：

Standard number	Variety	heat treatment	θ/℃	Tensile properties			Long-lasting performance		Room temperature hardnessHBS
				σb/MPa	δ₅/%	ψ/%	σ/MPa	τ/h
				≥				≥
GB/T 14993	Hot rolled rods	Standard heat treatment	800	665	4.5	8.0	(245)	(100)	341～269
			850	——			196	50
GB/T 14995	Hot rolled plate	Delivery status	20	685	30.0	Measured	—		——
		Standard heat treatment	800	540	6.0	Measured
GJB 1952	Cold-rolled sheet	Delivery status	20	≤1130	30.0		—	—	——
		Standard heat treatment	800	540	8.0		275	23	Measured
							Ⅱ 215	100
YB/T 5248	Master alloy	Standard heat treatment	20	686	4.0	6.0
			750	——	—	—	392	50

GH302 Alloy properties：

HuaNickel GH302 alloy is notch-sensitive at 700°C and 850°C; After aging at 750°C×10000h, bamboo leaf-like Laves4 was generally precipitated into the crystal.   The alloy has a small crack tendency in argon arc welding in the solid solution state, and it is aging after welding. It is difficult to carry out contact welding of plates, and attention should be paid to the use of appropriate welding processes.

GH302 Uses of alloys：

Alloys have been used in the manufacture of turbojet engines, afterburners, etc., as well as industrial gas turbine blades.

GH302 Process performance：

Welding process

Plate thickness/mm	Welding wire	State	The fitting is stretched at 20 °C		The fitting is stretched at 800°C		Connector 800°C, 215MPa durable
			σbMPa	strength coefficient/%	σb/MPa	Strength factor/%	τ/h	Strength factor
1.5+1.5	SHG-1	Aging before and after solution welding	1227	96.3	669	98.9	150	5～100
1.5	—		1270		677		162

Relevant standards：

GB/T14993、 GJB1952A、 YB/T 5248、HB/Z140