하스텔로이® C-276

What is 하스텔로이® C-276 ?

Hastelloy C276 is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments. The high nickel and molybdenum contents make the nickel steel alloy especially resistant to pitting and crevice corrosion in reducing environments while chromium conveys resistance to oxidizing media. The low carbon content minimizes carbide precipitation during welding to maintain corrosion resistance in as-welded structures. This nickel alloy is resistant to the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process application in an as welded condition.

하스텔로이® C-276 Products Form

• 원활한 & welded pipe
• 원활한 & welded tube
• Bar
• Wire
• Sheet
• Plate
• Forgings
• Pipe fittings
• Flanges
• Weld Rod

Applications for 하스텔로이® C-276

• Digesters and bleach plants in the paper industry.
• Components exposed to sour gas.
• Equipment for flue-gas desulfurisation plants.
• Evaporators, heat exchangers, filters and mixers used in sulfuric acid environments.
• Sulfuric acid reactors.
• Organic chloride process equipment.
• Equipment for processes utilizing halide or acid catalysts.

Equivalents of Hastelloy® C-276

STANDARD	WERKSTOFF NR.	우리를	그	고스트	안에	OR
Hastelloy C276	2.4819	N10276	NW 0276	ХН65МВУ	NiMo16Cr15W	ЭП760

화학 성분

GRADE

Cr

MN

Co

Fe

모

w

기음

V

피

에스

그리고

~ 안에

HASTELLOY C-276

MIN

14.5

–

–

4

15

3

–

–

–

–

–

–

MAX

16.5

1

2.5

7

17

4.5

0.01

0.35

0.04

0.03

0.08

Remainder

기계적 성질

Element	밀도	녹는 점	인장강도	항복 강도 (0.2%오프셋)	연장
Hastelloy C276	8.89 G / CM3	1370 ℃ (2500 ° F)	Psi – 1,15,000 , MPa – 790	Psi – 52,000 , MPa – 355	40 %

물리적 특성

DENSITY	8.89 g/cm 3 / 0.321 lb/in 3
MELTING POINT	1325 -1370 (℃) / 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	1121 (℃) / 2050 (° F)
QUENCH	Rapid Air/Water

부식 저항

Considered one of the most versatile corrosion resistant alloys available, Hastelloy C-276 exhibits excellent resistance in a wide variety of chemical process environments including those with ferric and cupric chlorides, hot contaminated organic and inorganic media, chlorine, formic and acetic acids, acetic anhydride, seawater, brine and hypochlorite and chlorine dioxide solutions. 게다가, alloy C-276 resists formation of grain boundary precipitates in the weld heat affected zone making it useful for most chemical processes in the as-welded condition. This alloy has excellent resistance to pitting and stress corrosion cracking.

Fabrication and Heat Treatment

Alloy C-276 material can be forged, hot-upset and impact extruded. All of the common methods of welding can be used, although the oxyacetylene and submerged arc processes are not recommended when the fabricated item is for use in corrosion service.

HASTELLOY C-276 alloy can be hot forged, hot rolled, hot upset, hot extruded, and hot formed.  Although the alloy tends to work-harden, you can have it successfully spun, deep-drawn, press formed or punched.

하지만, it is more sensitive to strain and strain rates than the austenitic stainless steels, and the hot working temperature range is quite narrow. 예를 들어, Hot forming should be between 1600 and 2250°F (870 and 1230°C), with all heavy forming above 2000°F (1090℃).

HASTELLOY C-276 alloy work hardens more readily than most austenitic stainless steels, and may require several stages of cold work, with intermediate anneals. INCONEL alloy C-276 is normally annealed at 2100-2150°F (1150-1175℃) and rapidly cooled such as by water quenching

Hot Working

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

Cold Working

Conventional cold working procedures are used for cold working HASTELLOY(r).

FORGING

The alloy is forged between 2250/1750ºF (1230/955ºC) following a soak at forging temperature of 30 minutes per inch of billet or ingot section thickness. Forging should be started immediately the stock is removed from the reheat furnace and 25/40% reductions help to retain as much internal heat as possible. For optimum corrosion resistance, forged parts should be subsequently annealed. See Heat Treatment.

MACHINABILITY

The alloy is considered moderate to difficult to machine, but can be machined using conventional methods. The alloy has a high work hardening rate, and efficient machining requires rigid and overpowered machines, sharp tools, preferably carbide-tipped, and heavy, constant feeds.

Welding

Gas tungsten-arc welding, gas metal-arc welding, shielded metal-arc (coated electrode) 용접, 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 C-276 can be used in the as-welded condition in most chemical and petrochemical process equipment.

Advantages of Using Hastelloy C-276 Alloys

Hastelloy C-276 is a remarkable alloy known for its exceptional corrosion resistance and durability. This nickel-molybdenum-chromium alloy is designed to withstand harsh environments, making it a top choice in demanding industries. Its unique composition and properties offer significant advantages, ensuring reliability and longevity in various applications.

Industries such as chemical processing, 석유 및 가스, and aerospace rely on Hastelloy C-276 for its robust performance. The alloy’s ability to resist pitting, crevice corrosion, and stress corrosion cracking is unmatched. These qualities make it an ideal material for high-stress and corrosive environments.

Choosing Hastelloy C-276 means investing in a material that offers long service life and reduced maintenance costs. Its versatility and compliance with industry standards further enhance its appeal. This article explores the many benefits and applications of this exceptional alloy.

Benefits of Choosing Hastelloy C-276 Alloy

Selecting Hastelloy C-276 offers numerous advantages. Its remarkable resistance to corrosion leads to lower maintenance costs. 또한, its stability under high stress ensures performance.

Notable benefits include:

• Exceptional durability
• Long service life
• Versatile applications

Conclusion

Hastelloy C-276 stands out as a reliable material choice in harsh conditions. Its unique blend of properties ensures longevity and dependability across diverse industries.

Investing in this alloy means prioritizing safety and efficiency. The many benefits of Hastelloy C-276 align with the demands of modern engineering and industry needs, making it a smart and sustainable choice.