Hastelloy C276

Hastelloy C276 is a high-performance nickel-based alloy composed mainly of nickel, molybdenum, chromium, iron and tungsten, nickel is the main element of the alloy, giving it good toughness and ductility. The addition of chromium and molybdenum, on the other hand, significantly improves the alloy’s corrosion resistance, enabling it to operate stably over long periods of time in harsh corrosive environments. In addition, Hastelloy C276 contains small amounts of iron, tungsten and cobalt to further optimize its properties.

The manufacturing method of Hastelloy C276 mainly includes melting, forging, rolling and other processes. During the melting process, the chemical composition of the alloy needs to be strictly controlled to ensure the stability of its properties. Forging and rolling processes are used to process the alloy into the required shapes and sizes to meet the needs of different industrial applications. Alloy C276 is widely used in several industrial sectors for its excellent corrosion resistance, high temperature strength and mechanical properties, making it the material of choice, especially in harsh corrosive environments.

Hastelloy C276 Composition

Element	Percent
(Ni) Nickel	Remainder
(Mo) Molybdenum	15.0 to 17.0
(Cr) Chromium	14.5 to 16.5
(Fe) Iron	4.0 to 7.0
(W) Tungsten	3.0 to 4.5
(Co) Cobalt	2.5 max
(Mn) Manganese	1.0 max
(V) Vanadium	0.35 max
(Si) Silicon	0.08 max
(P) Phosphorus	0.04 max
(S) Sulfur	0.03 max
(C) Carbon	0.010 max

Hastelloy C276 Physical Properties

Physical Properties	Value
Density	8.89 g/cm 3 / 0.321 lb/in 3
Melting Point	1325 -1370 (°C) / 2415 – 2500 (°F)
Specific Heat @ 70°F	0.102 Btu/lb/°F
Thermal Conductivity @ 70°F	67.9 Btu•in/h/ft2/°F
Young’S Modulus 103ksi	29.8
Shear Modulus 103ksi	11.4
Permeability (15.9 Ka/M)	1.0002 (200 oersted)
Poisson’S Ratio	0.307
Annealed Temperature	1121 (°C) / 2050 (°F)
Quench	Rapid Air/Water

Hastelloy C276 Mechanical Properties

Product Form	Tensile Strength		Yield Strength (0.2% Offset)		Elongation	Hardness
	ksi	MPa	ksi	MPa	%	Rb
Tubing	105.4	727	45.4	313	70	92
Plate	107.4	741	50.3	347	67	89
Bar	110.0	758	52.6	363	62	88
Sheet	115.5	796	54.6	376	60	86

Hastelloy C276 Equivalent

• UNS N10276
• DIN 2.4819
• EN NiMo16Cr15W
• JIS NW 0276

Hastelloy C276 Specifications

• Plate, Sheet & Strip: ASTM B575, ASME SB575
• Rod & Bar: ASTM B574, ASME SB574
• Seamless Pipe & Tube: ASTM B622, ASME SB622
• Welded Pipe & Tube: ASTM B619, ASME SB619
• Fittings: ASTM B366, ASME SB366
• Forgings: ASTM B564, ASME SB564

Hastelloy C276 Corrosion Resistance

• Resistance to chloride corrosion: excellent performance in environments containing chloride ions, resistant to pitting and crevice corrosion.
• Acid corrosion resistance: very high resistance to a wide range of acids (e.g. sulphuric acid, hydrochloric acid, nitric acid), especially to reducing and oxidizing acids.
• Alkali corrosion resistance: also has good corrosion resistance to alkaline media.
• Seawater corrosion resistance: it shows excellent corrosion resistance in the marine environment.

High Temperature Properties

• High-temperature strength: at high temperatures (up to 650°C or higher, some sources mention up to 1900°F or about 1038°C, but the specific use of the temperature should be based on the application scenario), Hastelloy C276 can still maintain good mechanical strength and creep strength.
• Oxidation resistance: excellent oxidation resistance at high temperatures, preventing the formation of oxide skin.

Processing Performance

• Good cold workability: it can be cold rolled, cold drawn and other cold working processes to obtain high precision finished products.
• Good weldability: it can be welded by various welding methods (e.g. TIG, MIG, etc.), but it should be preheated before welding, and proper heat treatment is required after welding. Welding performance is similar to ordinary austenitic stainless steel, but care should be taken to maintain the corrosion resistance of the weld and heat-affected zone.

Applications

1. Chemical and petrochemical: Used in the manufacture of equipment such as reactors, heat exchangers, pipes, pumps, etc., in contact with strong corrosive substances.
2. Flue Gas Desulphurisation (FGD): Used in the manufacture of components for FGD systems such as nozzles, pipes and towers.
3. Pulp and paper: used to manufacture pulp and paper process corrosive media contact parts.
4. Environmental protection: for the manufacture of key components in wastewater treatment and exhaust gas treatment plants.
5. Energy industry: for manufacturing high-temperature components for nuclear and thermal power stations, such as sulphuric acid condensers, equipment and components in acid gas environments.

Hastelloy Alloy

• HASTELLOY B-2, nickel-molybdenum alloy with excellent corrosion resistance in reducing environments
• HASTELLOY B-3, an upgraded version of B-2 with excellent corrosion resistance to hydrochloric acid at all temperatures and concentrations.
• HASTELLOY C-4, better thermal stability, good toughness and corrosion resistance at 650-1040 degrees Celsius.
• Hastelloy
• HASTELLOY C-22, better homogeneous corrosion resistance than C-4 and C-276 in oxidizing media, excellent resistance to localized corrosion.
• HASTELLOY C-276, good resistance to oxidizing and moderately reducing corrosion, excellent resistance to stress corrosion.
• HASTELLOY C-2000, the most versatile corrosion resistant alloy with excellent resistance to uniform corrosion in both oxidizing and reducing environments.
• HASTELLOY G-35, upgraded product of G-30, with better corrosion resistance and thermal stability
• HASTELLOY G-30, high chromium content nickel-based alloy with excellent performance in phosphoric acid and other strong oxidizing mixed acid media.
• HASTELLOY X, combines high strength, oxidation resistance and ease of processing.

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