HAYNES^® 556^® alloy is approved for ASME Vessel Code Section I construction to 1200°F (650°C) under Code Case No. 2010 and Section VIII Division 1 construction to 1650°F (900°C). Allowable stresses are reprinted here by permission of the ASME.

ASME Vessel Code Allowable Stresses
Metal Temperatures Not Exceeding		Maximum Allowable Stress Values
Metal Temperatures Not Exceeding		Standard		Note⁽¹⁾
°F	°C	Ksi	(MPa)	Ksi	(MPa)

100	37	25.0	(172)	25.0	(172)
200	93	25.0	(172)	25.0	(172)
300	149	23.1	(159)	24.5	(168)
400	204	21.3	(146)	23.7	(163)
500	260	20.1	(138)	23.1	(159)
600	315	19.3	(133)	22.8	(157)
650	343	19.0	(131)	22.7	(156)
700	371	18.7	(129)	22.5	(155)
750	398	18.5	(127)	22.4	(154)
800	426	18.2	(125)	22.3	(153)
850	454	18.0	(124)	22.2	(153)
900	482	17.8	(122)	22.1	(152)
950	510	17.6	(121)	21.8	(150)
1000	537	17.4	(120)	21.6	(148)
1050	565	17.2	(118)	21.4	(147)
1100	593	17.1	(118)	20.8	(143)
1150	621	16.9	(116)	16.9	(116)
1200	648	13.6	(93)	13.6	(93)
1250	676	10.9	(75)	10.9	(75)
1300	704	8.8	(60)	8.8	(60)
1350	732	7.0	(48)	7.0	(48)
1400	760	5.6	(38)	5.6	(38)
1450	787	4.5	(31)	4.5	(31)
1500	815	3.6	(25)	3.6	(25)
1550	843	2.8	(19)	2.8	(19)
1600	871	2.2	(15)	2.2	(15)
1650	898	1.8	(12)	1.8	(12)

NOTE⁽¹⁾
Due to the relatively low yield strength of this material, these higher stress values were established at temperatures where the short time tensile properties govern to permit the use of these alloys where slightly greater deformation is acceptable. These higher stress values exceed 67%, but do not exceed 90% of the yield strength at temperature. Use of these stress values may result in dimensional changes due to permanent strain. These stress values are not recommended for flanges of gasketed joints or other applications where slight amounts of distortion can cause leakage or malfunction.

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.