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INCONEL 718 / UNS N07718 / GH4169

lnconel® 718 is a nickel-chromium alloy being precipitation hardenable and having high creep-rupture strength at high temperatures to about 1300 °F (700 °C).

Inconel 718 alloy description：

Alloy 718 has excellent corrosion resistance at high and low temperatures and good resistance to stress-corrosion cracking and pitting corrosion. Alloy 718 has good performance in hostile environments containirng H2S,C02,chlorides,suifides and free sulfur at selected temperatures.Alloy 718 is commonly used for cryogenic storage tanks,downhole shafts and wellhead parts.

Chemical composition:

Alloy	%	Ni	Cr	Fe	Mo	Nb	Co	C	Mn	Si	S	Cu	Al	Ti	P
ICONEL625	Min	50	17	Bal.	2.8	4.75	–	–	–	–	–	–	0.2	0.65	–
ICONEL625	Max	55	21	Bal.	3.3	5.5	1	0.08	0.35	0.35	0.015	0.3	0.081	1.15	0.75

Physical property:

Fusing point	Density	Tensile strength	Yield strength	Rate of elongation	Brinell hardness
1260-1340℃	8.24G/CM³	RMN/MM²	RP0.2N/MM2	A5%	HB
		965	550	30	≤363

Product characteristics：

1. Ease of processing
2. High tensile strength, fatigue strength, creep strength and fracture strength at 700℃
3. High oxidation resistance at 1000℃
4. Stable chemical composition at low temperature
5. Good welding performance

Metallographic structure:

718 alloy is austenitic structure, and the Y “phase formed after precipitation hardening gives it excellent mechanical properties. The delta phase formed at the grain boundary during heat treatment gives it the best plasticity

Corrosion resistance:

In both high and low temperature environments, 718 alloy has excellent resistance to stress corrosion cracking and pitting. 718 alloys are particularly resistant to oxidation at high temperatures.

Application field:

Due to its high temperature strength and excellent corrosion resistance at 700℃, the 718 can be widely used in a variety of high demand occasions.
Steam turbine liquid combustion rocket cryogenic engineering Acid environment nuclear engineering