HAYNES^® 556^® exhibits reasonable retained ductility after long term thermal exposure at intermediate temperatures. It does not exhibit significant sigma phase formation even after 16,000 hours exposure at 1000 to 1600°F(540 to 870°C). Principal phases precipitated from solid solution are carbides and carbonitrides.

Room-Temperature Tensile Properties of Bar Following Thermal Exposure*

Exposure Temperature		Hours	Ultimate Tensile Strength		Yield Strength at 0.2% Offset		Elongation in 2 in. (50.8 mm)
°F	°C	Hours	Ksi	MPa	Ksi	MPa	%

1200	650	0	113.4	780	62.5	430	46.5
		1000	120.5	830	59.7	410	36.0
		4000	121.2	835	57.4	395	33.0
		8000	127.3	880	59.8	410	29.4

1400	760	0	113.4	780	62.5	430	46.5
		1000	128.7	885	60.8	420	24.8
		4000	127.1	875	57.4	395	25.8
		8000	125.1	865	54.6	375	24.7

1600	870	0	113.4	780	62.5	430	46.5
		1000	112.9	780	52.3	360	32.8
		4000	111.5	770	42.8	295	29.0
		8000	108.1	745	43.9	305	29.5
* Average of three tests for each condition.

Elevated-Temperature Tensile Properties of Bar Following 16,000-Hour Thermal Exposures*

Test Temperature		Ultimate Tensile Strength		Yield Strength at 0.2% Offset		Elongation in 2 in. (50.8 mm)
°F	°C	Ksi	MPa	Ksi	MPa	%

1000	537	95.7	660	37.4	260	48.0
1200	648	88.8	610	37.8	260	23.4
1400	760	72.3	500	35.1	240	25.3
1600	871	42.1	290	21.9	150	29.5

Room-Temperature Tensile Properties of Sheet Following 1000-Hour Thermal Exposures*

Test Temperature		Ultimate Tensile Strength		Yield Strength at 0.2% Offset		Elongation in 2 in. (50.8 mm)
°F	°C	Ksi	MPa	Ksi	MPa	%

Room	Room	118.1	815	59.5	410	47.7
1200	648	118.4	815	53.4	370	37.9
1400	760	118.8	820	53.8	370	17.0
1600	871	111.0	765	46.6	320	20.4

* Average of two or more tests

Haynes International, Inc. 800-354-0806 765-456-6012

HAYNES® 556® alloy Information

An iron-nickel-chromium-cobalt alloy that combines effective resistance to sulfidizing, carburizing and chlorine-bearing environments with good oxidation resistance, fabricability and excellent high-temperature strength.

HAYNES^® 556^®alloy Information

An iron-nickel-chromium-cobalt alloy that combines effective resistance to sulfidizing,
carburizing and chlorine-bearing environments with good oxidation resistance,
fabricability and excellent high-temperature strength.