ASTM B637, B 670, B 906
NACE MR-01-75

Inconel 718 is a Nickel-Chromium alloy being precipitation hardenable and having high creep-rupture strength at high temperatures to about 700°C (1290°F). It has higher strength than Inconel X-750 and better mechanical properties at lower temperatures than Nimonic 90 and Inconel X-750.

In what forms is Inconel 718 Available at SAGAR STEELS?

What are the characteristics of Inconel 718?

Good mechanical properties – tensile, fatigue and creep-rupture
Yield tensile strength, creep, and rupture strength properties are exceedingly high
Highly resistant to chloride and sulfide stress corrosion cracking
Resistant to aqueous corrosion and chloride ion stress corrosion cracking
High temperature resistant
Age-hardenable with a unique property of slow aging response that permits heating and cooling during annealing without the danger of cracking.
Excellent welding characteristics, resistant to postweld age cracking

The compositional range for Inconel 718 is provided in the table below.

Typical properties of Inconel 718 are covered in the following table.

Condition of Supply	Heat Treatment (After Forming)
No.1 Spring Temper/Spring Temper	1. Solution Anneal at 980°C (1800°F) for 1 hour and air cool and 2. Age harden at 720°C (1330°F) for 8 hours and furnace cool to 620°C (1150°F) and hold at 620°C (1150°F) for a total age hardening time of 18 hours and air cool.
No.1 Spring Temper/Spring Temper (NACE MRO175)	1. 1010°C (1870°F) 2 hours and air cool and 2. 790°C (1455°F) 6 hours and air cool.
Condition	Approx Tensile Strength		Approx Service Temp.
Annealed	800 - 1000 N/mm²	116 - 145 ksi	–	-
No.1 Spring Temper	1000 - 1200 N/mm²	145 - 175 ksi	–	-
No.1 Spring Temper + Annealed + Aged	1250 - 1450 N/mm²	181 - 210 ksi	-200 to +550°C	-330 to +1020°F
Spring Temper	1300 - 1500 N/mm²	189 - 218 ksi	–	-
Spring Temper + Annealed + Aged	1250 - 1450 N/mm²	181 - 210 ksi	-200 to +550°C	-330 to +1020°F

In what applications is Inconel 718 used?