HASTELLOY C-276/UNS N10276/Alloy C-276

Hastelloy C-276 Seamless Pipe, UNS N10276 Plate, Alloy C-276 Round Bar

Hastelloy C-276 (UNS N10276) alloy is a nickel-molybdenum-chromium wrought alloy that is a versatile corrosion-resistant alloy. C-276 alloy is an improved wrought version of alloy C in that it usually doesn’t need to be solution heat-treated after welding and has vastly improved fabricability. This alloy resists the formation of grain-boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process applications in the as-welded condition. However, in environments where an attack of the C-276 alloy weld joint is experienced. C-22 weld filler materials should be considered. C-276 alloy has excellent resistance to localized corrosion and to both oxidizing and reducing media. Because of its versatility, C-276 alloy can be used where “upset” conditions are likely to occur or in multipurpose plants. Hastelloy C-276 alloy has excellent resistance to a wide variety of chemical process environments, including strong oxidizers such as ferric and cupric chlorides, hot contaminated media (organic and inorganic), chlorine, formic and acetic acids, acetic anhydride, and seawater and brine solutions. It is used in flue gas desulfurization systems because of its excellent resistance to sulfur compounds and chloride ions encountered in most scrubbers. C-276 alloy has excellent resistance to pitting and to stress- corrosion cracking. It is also one of the few materials that withstand the corrosive effects of wet chlorine gas, hypochlorite, and chlorine dioxide.

Hastelloy C-276 alloy can be forged, hot-upset and impact extruded. Although the alloy tends to work hard, it can be successfully deep-drawn, spun, press formed or punched. All of the common methods of welding can be used to weld Hastelloy C-276 alloy, although the oxyacetylene process is not recommended. Special precautions should be taken to avoid excessive heat input.

Hastelloy C-276 is available in the form of plate, sheet, strip, billet, bar, wire, covered electrodes, pipe, tubing, pipe fittings, flanges, and fittings.

Heat Treatment: C-276 alloy is normally solution heat-treated at 2050°F (1121°C) and rapid quenched. If possible, parts which have been hot-formed should be solution heat-treated prior to final fabrication or installation.

Chemical Composition

Nickel:	57 Balance
Cobalt:	2.5 max.
Chromium:	16
Molybdenum:	16
Iron:	5
Tungsten:	4
Manganese:	1 max.
Vanadium:	0.35 max.
Silicon:	0.08 max.
Carbon:	0.01 max.
Copper:	0.5 max.

Mechanical Properties:

Form	Test Temperature		Thickness		0.2%Offset Yield Strength		Ultimate Tensile Strength		Elongation
	°F	°C	in	mm	ksi	MPa	ksi	MPa	%
Sheet	RT	RT	0.078	2	51.6	356	114.9	792	61
Sheet	400	204	0.078	2	42	290	100.6	694	59
Sheet	600	316	0.078	2	35.9	248	98.8	681	68
Sheet	800	427	0.078	2	32.7	225	94.3	650	67
Sheet	400	204	0.094	2.4	39.9	275	101	696	58
Sheet	600	316	0.094	2.4	33.5	231	97.6	673	64
Sheet	800	427	0.094	2.4	29.7	205	93.5	645	64
Sheet1	400	204	0.063-0.187	1.6-4.7	42.1	290	100.8	695	56
Sheet2	600	316	0.063-0.187	1.6-4.7	37.7	260	97	669	64
Sheet2	800	427	0.063-0.187	1.6-4.7	34.8	240	95	655	65
Sheet2	1000	538	0.063-0.187	1.6-4.7	33.8	233	88.9	613	60
Plate3	400	204	0.188-1.0	4.8-25.4	38.2	263	98.9	682	61
Plate3	600	316	0.188-1.0	4.8-25.4	34.1	235	94.3	650	66
Plate3	800	427	0.188-1.0	4.8-25.4	32.7	225	91.5	631	60
Plate3	1000	538	0.188-1.0	4.8-25.4	32.8	226	87.2	601	59
Plate	RT	RT	1	25.4	52.9	365	113.9	785	59
Plate	600	316	1	25.4	36.2	250	96.3	664	63
Plate	800	427	1	25.4	30.5	210	94.8	654	61

1: Average of 25 tests

2: Average of 34-36 tests

3: Average of 9-11 tests RT= Room Temperature

Impact Strength:

Type of Test	Test Temperature	Form	Thickness		Impact Strength
			in	mm	ft.lbf	J
Charpy V-Notch	RT	Plate	0.394	10	348	472
Charpy V-Notch	RT	Plate	0.472	12	351	476

*RT= Room Temperature

Available Products Forms:

HASTELLOY C-276 alloy (N10276, W10276)
Sheet, Plate & Strip	SB 575/B 575, PREN= 43
Billet, Rod & Bar	SB 574/B 574, B 472, PREN= 43
Coated Electrodes	SFA 5.11/ A 5.11 (ENiCrMo-4), DIN 2.4887, (EL-NiMo15Cr15W) F= 43
Bare Welding Rods & Wire	SFA 5.14/ A 5.14 (ERNiCrMo-4), DIN 2.4886, (SG-NiMo16Cr16W), PREN= 43
Seamless Pipe & Tube	SB 622/B 622, B 983, PREN= 43
Welded Pipe & Tube	SB 619/B 619, SB 626/B 626, PREN= 43
Fittings	SB 366/B 366, SB 462/B 462, PREN= 43
Forgings	SB 564/B 564, SB 462/B 462, PREN= 43
DIN	17744 No. 2.4819 NiMo16Cr15W
TÜV	Werkstoffblatt 400, Kennblatt 320, Kennblatt 319
Others	NACE MR0175 ISO 15156

Hardness:

Form	Hardness, HRBW	Typical ASTM Grain Size
Sheet	88	3.5 – 6
Plate	88	1 – 5
Bar	86	1 – 5

All samples were tested in solution-annealed condition. HRBW = Hardness Rockwell “B”, Tungsten Indentor.

Applications:

• Air Pollution Control—flue gas desulfurization systems – stack liners, absorbers, ducts, dampers, stack gas re-heaters and fans
• Chemical Processing—heat exchangers, pressure vessels, tanks, evaporators, piping, flanges and fittings, pumps and valves
• Oil and Gas Production—sour gas service components
• Pharmaceutical Production—reactor vessels, piping, flanges and fittings, pumps and valves
• Pulp and Paper—bleaching vessels and digestors
• Waste Treatment—incinerators for toxic, industrial and municipal waste

Keywords to find us: UNS N10276, ASME SB-574, ASME SB-575, ASME SB-619, ASME SB-622, and ASME SB-626