Hastelloy C276(Ni-Cr-Mo)

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1. Introduce

– Ni-Cr-Mo-(W) alloy with enhanced resistance to pitting, crevice corrosion and stress corrosion cracking in a wide range of severe environments

– Low content of C, Si : Improved intergranular corrosion resistance, less susceptible to intergranular corrosion, prevent welding heat affected zone corrosion
→ Minimizes carbide precipitation during welding to maintain resistance to intergranular attack in the heat affected zone of welded joints

– UNS N10276

* High C content → more precipitated carbides in grains → lower corrosion resistance

* High Si, C content → tendency to form second phase in the last stage of solidification → tensile strain/stress action → high temperature cracking, poor weldability (widen the solidification temperature range)

* UNS

Abbreviation of Unified Numbering Systems for Metals and Alloys
Unified unique numbering system for metals and alloys
A representative number that is compatible with metals and alloys defined in many material-related codes such as ASTM, AISI, ASME, AWS, etc.

* N : Nickel and nickel alloys

* UNS N10276 : 10XXX : Molybdenum(Hastelloy)

* Hastelloy

– A corrosion-resistant alloy with Ni as the main component

– Excellent machinability, weldability, and can be machined into various shapes

– Main types and characteristics

Hastelloy B
* Main composition
– Ni-Mo
* Characteristics
– Hydrochloric acid-resistant alloy : Excellent hydrochloric acid resistance by containing a large amount of Mo
– Corrosion resistance in non-oxidizing atmosphere, excellent resistance to hydrogen chloride gas and reducing solution
Hastelloy C
* Main composition
– Ni-Cr-Mo
* Characteristics
– Oxidation resistance alloy : Excellent oxidation resistance by containing a large amount of Cr
– Excellent corrosion resistance in oxidizing atmospheres such as nitric acid and chlorine due to the addition of Cr
Hastelloy X
* Main composition
– Ni-Cr-Fe-Mo
* Characteristics
– Alloy designed for good oxidation resistance at 1200 degrees, Good corrosion resistance in oxidizing, sulfuric and phosphoric acid atmospheres

2. Property

– Excellent corrosion resistance to oxidizing and non-oxidizing atmospheres, crevice corrosion and pitting corrosion caused by materials

– Suitable for gas metal arc (GMA, MIG), gas tungsten arc (GTA, TIG), shielded metal arc (SMA, STICK) welding processes

Element	Impact
Ni	Provides corrosion resistance
Cr, Mo	oxidizing and non-oxidizing acid resistance, good localized corrosion resistance in chloride and other halide atmospheres
Mn, P	Provides machinability, weldability → Prevents formation of grain boundary deposits in the weld heat zone → Applicable in the welded condition for chemical process applications

[Hastelloy C276 Chemical Composition (%)]

Ni	Cr	Fe	C
51.02 ~ 63.50	14.50 ~ 16.50	4.00 ~ 7.00	Max. 0.01

Si	Mn	Mo	S
Max. 0.08	Max. 1.00	15.00 ~ 17.00	Max. 0.01

Co	W	P	V
Max. 2.50	3.00 ~ 4.50	Max. 0.03	Max. 0.35

[Hastelloy C276 Mechanical Properties]

Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
Min. 690	Min. 283	Min. 40

[Hastelloy C276 Physical Properties]

Density (g/cm³)	Melting Range (℃)	Specific Heat (0~100℃), *J/kg℃**
8.89	1325 ~ 1370	427

3. Standard & Specification

– Specification : UNS N10276

Product Form	ASTM	ASME	AWS
Rod, Bar, Wire	B462, B574	SB574	–
Forging Stock	B462, B564	SB564	–
Plate, Sheet and Strip	B575, B906	SB575, SB906	–
Pipe and Tube	B622, B829, B626, B751, B619, B775	SB622, SB829, SB626, SB751, SB619, SB775	–
Filler Metal	–	–	WS A5.14/ERNiCrMo-4
Welding Electrode	–	–	AWS A5.11/ENiCrMo-4

4. Available Form

– Rod, Bar, Wire

– Forging Stock

– Plate, Sheet and Strip

– Pipe and Tube

– Welding Products(Filler Metal, Welding Electrode)

5. Application & Product

– Aerospace, Chemical, Oil & Gas, Power Generation

Application	Product
Aerospace	Aircraft exhaust systems, turbine engine components
Chemical	Reactors, heat exchangers, piping
Oil and gas	Sulfuric acid alkylation units, acid gas wellheads and refinery equipment
Power generation	Gas desulfurization systems, turbine exhaust systems