Nickel-based superalloy is the most widely used material in aero engine history

GH4169 (original grade: GH169), also known as NS4301, equivalent to Inconel 718, is a precipitation-hardening nickel-based high-temperature corrosion-resistant alloy.

❒ National Standards

China	GB/T 14992-2005 GB/T 14994-2008 GB/T 30566-2014 GJB 712A-2001 GJB 713-1989 HB 6702-1993	GH4169
	GB/T 15007-2017	NS4301
	GB/T 26030-2010	NW7718 NiCr19Fe19Nb5Mo3
U.S.	ASTM B637-2006 ASTM B670-2007 ASTM B983-2013a	UNS N07718
Japan	JIS G7604:2000 JIS G7605:2001	NW7718 NiCr19Fe19Nb5Mo3
Japan	JIS G4901:1991 JIS G4902:1991	NCF718
Germany	DIN 17744:2002 DIN 17750:2002 DIN 17752:2002 DIN 17753:2002 DIN EN 10088:1:2005 DIN EN 10302:2002	NiCr19Fe19Nb5Mo3 2.4668

❒ Ingredient specification (%)

avaliar	GH4169	N07718	NW7718	2.4668
C	≤0.08	≤0.08	≤0.08	0.02~0.08
Si	≤0.35	≤0.35	≤0.40	≤0.35
Mn	≤0.35	≤0.35	≤0.40	≤0.35
P	≤0.015	≤0.015	≤0.015	≤0.015
S	≤0.015	≤0.015	≤0.015	≤0.015
Cr	17.0~21.0	17.0~21.0	17.0~21.0	17.0~21.0
Ni	50.0~55.0	50.0~55.0	50.0~55.0	50.0~55.0
Mo	2.80~3.30	2.80~3.30	2.80~3.30	2.80~3.30
Co	≤1.00	(≤1.00)	(≤1.50)	≤1.00
Fe	margin	margin	margin	margin
Nb	4.75~5.50	4.75~5.50	4.70~5.50	4.70~5.50
Ta	—	4.75~5.50	4.70~5.50	4.70~5.50
Al	0.20~0.80	0.20~0.80	0.20~0.80	0.30~0.70
Ti	0.65~1.15	0.65~1.15	0.60~1.20	0.60~1.20
Cu	≤0.30	≤0.30	≤0.30	≤0.30
Mg	≤0.01	≤0.01	≤0.01	≤0.01
B	≤0.006	≤0.006	≤0.006	≤0.006

❒ Commercial grade

Special Metals	INCONEL® alloy 718
VDM Metals	VDM® Alloy 718 CTP Nicrofer 5219 Nb
Aperam	IMPHY 718
HAYNES	HAYNES® 718 alloy
CARPENTER	Pyromet® Alloy 718
ATI	ATI 718™
SANDVIK	Osprey® Alloy 718

❒ Physical properties ( GB/T 15007-2017)

Density g/cm ³	8.19
Thermal conductivity W/(m•℃)	11.4
Specific heat J/(kg•℃)	435
Melting point range °C	1260~1336
Average Linear Expansion Coefficient×10 ^-6 /℃ (25℃~100℃)	13.0
Young’s modulus GPa	200

❒ Mechanical properties ( GB/T 14994-2008 )

hot where reason	Solution treatment	950℃~980℃, 1h air cooling
hot where reason	Aging treatment	720℃, 8h 50±10℃/h furnace cooling to 620℃, 8h air cooling
force study sex can	Test temperature °C	room temperature	≥ 650
	Tensile strength MPa	≥ 1270	≥ 1000
	Specified non-proportional elongation strength MPa	≥ 1030	≥ 860
	Elongation after break%	≥ 12	≥ 12
	rate of reduction in area%	≥ 15	≥ 15
	Brinell hardness HBW	≥345
high temperature sex can	Test temperature °C	650
	Test stress MPa	690
	time h	≥ 23
	Elongation after break%	≥ 4

❒ Características

①High mechanical strength, with excellent mechanical properties in the temperature range of -253 to 700 °C, it shows extremely high yield, tensile and creep rupture properties at high temperatures, and the yield strength below 650 °C ranks among the highest in deformed superalloys. first place.

②High corrosion resistance, excellent resistance to stress corrosion cracking and pitting corrosion in chloride-containing media, and excellent resistance to stress corrosion cracking and sulfide stress cracking in acid (containing H ₂ S ) oil field environments Ability.

③Good processing performance. Under the condition of solution annealing, the yield strength of the material is low, and the surface hardness is about HRC20 or HRA55, which is suitable for forging.

④Excellent welding performance.

❒ Inscrição

GH4169 has good anti-fatigue, anti-radiation, anti-oxidation, anti-corrosion properties, as well as good processing and welding properties, and can manufacture various parts with complex shapes. Nuclear energy, petroleum industry, cryogenic engineering. Its most extensive application is in the aviation field. Many parts of modern aero-engines, such as turbine disks, blades, casings , shafts, stators, seals, supports, pipes, fasteners, etc., are made of GH4169.