Hastelloy C276 is used for desulphurization of flue gas equipment and for chemical process equipment

2024-08-05

Hastelloy C276 (UNS N10276) is a nickel-molybdenum-chromium-tungsten alloy with excellent general corrosion resistance and good fabricability. Hastelloy C276 should be considered for use in environments where resistance to hot contaminated mineral acids, organic and inorganic chloride-contaminated media, chlorine, formic and acetic acids, acetic , acetic anhydride, sea water and brine solutions is desired.

Hastelloy C276 (UNS N10276) has resisted the formation of grain boundary precipitates in the weld heat-affected zone, making it a candidate for most chemical and petrochemical processing applications in the as-welded condition. Hastelloy C276 has resisted both general and localized corrosion, including pitting, crevice corrosion, and stress corrosion cracking.

Other Designations

Equivalent materials to Hastelloy C276 are as follows.

ASTM B366	ASTM B574	ASTM B622	ASTM F467	DIN 2.4819
ASTM B575	ASTM B626	ASTM B619	ASTM F468

Chemical Composition

Element	Content (%)
Nickel, Ni	57
Molybdenum, Mo	15-17
Chromium, Cr	14.5-16.5
Iron, Fe	4-7
Tungsten, W	3-4.50
Cobalt, Co	2.50
Manganese, Mn	1
Vanadium, V	0.35
Silicon, Si	0.080
Phosphorous, P	0.025
Carbon, C	0.010
Sulfur, S	0.010

Physical Properties

Properties	Metric	Imperial
Density	8.89 g/cm³	0.321 lb/in³
Melting point	1371°C	2500°F

Mechanical Properties

Properties	Metric	Imperial
Tensile strength (@thickness 4.80-25.4 mm, 538°C/@thickness 0.189-1.00 in, 1000°F)	601.2 MPa	87200 psi
Yield strength (0.2% offset, @thickness 2.40 mm, 427°C/@thickness 0.0945 in, 801°F)	204.8 MPa	29700 psi
Elastic modulus (RT)	205 GPa	29700 ksi
Elongation at break (in 50.8 mm, @thickness 1.60-4.70 mm, 204°C/@thickness 0.0630-0.185 in, 399°F)	56%	56%
Hardness, Rockwell B (plate)	87	87

Thermal Properties

Properties	Metric	Imperial
Thermal expansion co-efficient (@24-93°C/75.2-199°F)	11.2 µm/m°C	6.22 µin/in°F
Thermal conductivity (-168 °C)	7.20 W/mK	50.0 BTU in/hr.ft².°F

Corrosion Resistance

Hastelloy C276 (UNS N10276) is balanced to provide excellent corrosion resistance to a variety of chemical process environments. This alloy has provided resistance to hot contaminated mineral acids, organic and inorganic chloride contaminated media, hypochlorite, chlorine dioxide solutions, formic and acetc acids, acetic anhydride, sea water and brine solutions.

Typical General Corrosion Rates

Environment	Concentration (% by weight)	Test Temperature		Penetration Rate (per year)
		°F	°C	Unwelded**		As-welded***		Welded and heat-treated**
				mils	mm	mils	mm	mils	mm
Formic Acid Hydrochloric Acid Hydrochloric Acid Hydrochloric Acid Hydrochloric Acid Sulfuric Acid Sulfuric Acid	20 10 10 10+0.5 NaOCl 3.5+8 Fe Cl3 10 85	Boiling 150 167 167 190 Boiling 167	Boiling 66 75 75 88 Boiling 75	4.8 21. 40. 46. -- 15. 17.	0.12 0.53 1.02 1.17 -- 0.38 0.43	3.5 20. 50. 50. 5. 14. 17.	0.09 0.51 1.27 1.27 0.13 0.36 0.43	3.60 21. -- -- -- 18. --	0.09 0.53 -- -- -- 0.46 --

Determined in laboratory tests. It is recommended that samples be tested under actual plant conditions.
Solution heat-treated
Gas tungsten-arc welded.

Annealing

Hastelloy C276 (UNS N10276) is generally used in the solution treated condition. This alloy is soaked at 1121°C (2050°F) and then quenched in a rapid manner.

Hot Working

Super alloy Hastelloy C276 is capable of being extruded or hot formed. After the hot forming process, this alloy should be solution heat treated.

Applications

Hastelloy C276 (UNS N10276) is used for desulphurization of flue gas equipment and for chemical process equipment.

Welding

Gas tungsten-arc welding, gas metal-arc welding, shielded metal-arc (coated electrode) welding, or resistance welding may be used. Minimum heat input consistent with adequate penetration reduces the chance of hot-cracking. Oxyacetylene welding should be avoided due to possibility of carburization. Hastelloy C276 can be used in the as-welded condition in most chemical and petrochemical process equipment.

Average Tensile Data

Form	Condition	Test Temp., °F(°C)	Ultimate Tensile Strength ksi (MPa)	Yield Strength at 0.2% offset ksi (MPa)	Elongation in 2" percent
Sheet, 0.063 to 0.187" Thick	Heat treated at 2050 °F Rapid Quenched	400 (204) 600 (316) 800 (427) 1000 (538)	100.8 (695) 97.0 (669) 95.0 (655) 88.9 (613)	42.1 (290) 37.7 (260) 34.8 (240) 33.8 (233)	56 64 65 60
Plate, 3/16 to 1.000" Thick	Heat treated at 2050 °F Rapid Quenched	400 (204) 600 (316) 800 (427) 1000 (538)	98.9 (682) 94.3 (650) 91.5 (631) 87.2 (601)	38.2 (263) 34.1 (235) 32.7 (235) 32.8 (226)	61 66 60 59
Plate, 1.000" Thick	Heat treated at 2050 °F Rapid Quenched	Room 600 (316) 800 (427)	113.9 (785) 96.3 (664) 94.8 (654)	52.9 (365) 36.2 (250) 30.5 (210)	59 63 61

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