HAYNES^® 556^® alloy is normally final solution heat-treated at 2150°F (1175°C) for a time commensurate with section thickness. Solution heat-treating can be performed at temperatures as low as about 2125°F (1165°C), but resulting material properties will be altered accordingly. Annealing during fabrication can be performed at even lower temperatures, but a final, subsequent solution heat treatment is needed to produce optimum properties and structure. Please refer to the following sections and publication H-3159 for additional information.

Typical Hardness Properties

Solution Annealed Room Temperature Hardness
Form	R_B
Sheet	91
Plate	96.5

Effect of Cold Reduction upon Room-Temperature Tensile Properties*

Percent Cold Reduction	Subsequent Anneal Temperature	Ultimate Tensile Strength		Yield Strength at 0.2% Offset		Elongation in 2 in. (50.8 mm)
Percent Cold Reduction	Subsequent Anneal Temperature	Ksi	MPa	Ksi	MPa	%

0	None	115.0	795	52.9	365	50.7
10		127.8	880	93.3	645	34.8
20		142.1	980	113.3	780	23.5
30		172.6	1190	144.1	995	12.0
40		189.3	1305	155.8	1075	10.1
50		204.2	1410	169.7	1170	8.0

0	1850°F (1010°C) for 5 min.	114.7	790	52.6	365	44.8
10		121.6	840	76.9	530	34.3
20		127.0	875	88.8	610	30.3
30		135.2	930	92.7	640	26.6
40		133.3	920	80.0	550	30.6
50		135.0	930	83.0	570	31.7

0	1950°F (1065°C) for 5 min.	115.8	800	52.9	365	45.2
10		122.2	845	76.8	530	36.9
20		124.7	860	76.8	530	34.8
30		125.1	865	66.0	455	38.3
40		128.1	885	71.4	490	36.7
50		131.0	905	77.9	535	33.4

0	2050°F (1121°C) for 5 min.	117.0	805	54.3	375	47.0
10		117.4	810	55.3	380	48.0
20		120.1	830	58.4	405	45.4
30		123.6	850	63.5	440	43.0
40		124.7	860	66.9	460	42.4
50		126.6	875	70.8	485	35.0

* Based upon rolling reductions taken upon 0.120-inch (3.0mm) thick sheet. Duplicate tests.

Typical Microstructure

(ASTM 5 grain size) Annealed at 2150°F (1175°C)
micro

Etchant:95ml
HCL plus 5gm oxalic acid, 4 volts

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.