GH4742

HuaNickel GH4742 is a nickel-based superalloy composed of Ni-Cr-Co and other elements, and the service temperature is below 800°C. The alloy has high durability and creep strength, good comprehensive properties, and good microstructure stability and corrosion resistance in the range of 550°C~800°C.

GH4742 Chemical composition：

	Ni	C	Cr	Co	Mo	AI	Ti	Nb	Fe	B	La	Mn	Si	P	S
Min	Bal	0.04	13	9	4.5	2.4	2.4	2.4	≤
Max		0.08	15	11	5.5	2.8	2.8	2.8	1	0.01	0.01	0.1	0.4	0.015	0.01

GH4742 Physical properties：

Density	8.23g/cm³
Magnetic properties	not

Coefficient of linear expansion

θ/℃	20～100	20～200	20～300	20～400	20～500
α/(10~5℃-1)	11.2	11.8	12.7	12.9	13.3
θ/℃	20～600	20～700	20～800	20～900	—
α/(10-6℃-l)	13.8	14.3	14.8	15.5

Resilient performance

Sampling		at the following temperatures，E/GPa
		20℃	600℃	650℃	750℃
Round cake forgings	System I	201		180	172
	System Ⅱ	196	170	162

GH4742 Mechanical properties：

Standard number	Variety	Forging use	heat treatment	Room temperature performance
				σb/MPa	σp0.2/MPa	δ₅/%	ψ/%	Ak/J	HBS
辽新6-0026 Q/GYB 05012 Q/GYB 05026 Q/GYB 5022	Hot rolled (forging rods, dies, forgings, forging round cakes	Aerospace	systemI or Ⅱ	≥1210	≥755	≥13	≥14	≥23	375～302
Q/GYB 05026	Die forgings	Ship gas turbines	System I orⅡ	≥1275	≥804	≥13	≥14	≥23	375～302

GH4742 Alloy properties：

GH4742 alloy has good oxidation resistance below 800°C and good corrosion resistance under all-weather conditions.

GH4742 Uses of alloys：

HuaNickel GH4742 alloy has been widely used in the manufacture of high-temperature load-bearing parts for aviation and aerospace engines, as well as marine gas turbines, such as high-pressure compressor discs, turbine discs, sealing grate tooth discs, load-bearing rings and fasteners.

GH4742 Process performance：

The heat treatment system of parts is: (1090~1120)°C×8h/AC (or compressed air blowing cooling)+850±10°C×(4~8)h/AC+780℃±10℃×10h/AC。

Relevant standards：

GB/T14992  、辽新6-0026 GH742 、Q/GYB 05012 GH4742 、Q/GYB 05022 GH4742 、Q/GYB 05026 GH4742