Hastelloy S (UNS N06635)

Hastelloy S alloy (UNS N06635) is a nickel-base, high-temperature alloy with a unique combination of properties. It has excellent thermal stability, low thermal expansion and excellent oxidation resistance to 1093℃. In addition, the alloy has good high-temperature and thermal fatigue strength. S alloy retains its strength and ductility after aging at temperatures of 427 to 871℃.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
Hastelloy S	–	–	Hastelloy S	N06635	–	–	–	–	–	–

Chemical Composition, %

Alloy

Hastelloy S

≤0.02

0.20-0.75

0.30-1.00

≤0.025

≤0.010

14.5-17.0

Bal

≤2.00

14.0-16.5

≤1.0

0.1-0.5

≤0.35

≤0.015

0.01-0.10

≤3.0

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HRB
8.75	1335-1380	840	385	47	/

Available Products and Specifications

Rod, Bar, Wire and Forgings	–
Plate, Sheet and Strip	–
Pipe and Tube	–
Welding Product	–
Others	–

Features

Excellent thermal stability
Low thermal expansion and excellent oxidation resistance to 1093℃
High temperature and thermal fatigue strength

Applications

Hastelloy S is mainly developed for applications involving severely cyclical heating conditions where components must be capable of retaining strength, ductility, and metallurgical integrity after long time exposure and are extensively used as seal rings in gas turbine engines where its low thermal expansion coefficients is also important.