What is Hastelloy C22 & C276?
Hastelloy C22 and Hastelloy C276 are premium nickel-chromium-molybdenum alloys developed for exceptional resistance to corrosion in aggressive chemical environments. Both grades offer outstanding protection against pitting, crevice corrosion, and stress corrosion cracking. Hastelloy C22 provides superior resistance to localized corrosion and oxidizing media, while Hastelloy C276 is renowned for its versatility and proven performance in a wide range of reducing and mixed chemical conditions. These alloys are widely used in chemical processing, pollution control, oil & gas, and marine industries where reliability in extreme environments is critical.
Hastelloy C22 & C276
Nickel (Ni)
Chromium (Cr)
Molybdenum (Mo)
Iron (Fe)
Tungsten (W)
Carbon (C) Max
Manganese (Mn) Max
Silicon (Si) Max
Types of Hastelloy C22 & C276 Pipes & Tubes
We supply a complete range of Hastelloy C22 and Hastelloy C276 pipes and tubes in seamless and welded forms, engineered to deliver long-term reliability in highly corrosive and high-temperature operating conditions.
Hastelloy C22 and C276 seamless pipes and tubes are preferred for critical chemical processing, offshore platforms, heat exchangers, and high-pressure corrosive services. The seamless construction eliminates weld-related weaknesses, ensuring superior mechanical strength, enhanced corrosion resistance, and reliable performance under severe temperature and pressure conditions.
Hastelloy C22 and C276 welded pipes and tubes offer a cost-effective solution for large-diameter and lower-pressure applications without compromising corrosion resistance. Manufactured using advanced welding techniques and subjected to stringent heat treatment and testing, these pipes provide consistent metallurgical properties and dependable service life in aggressive industrial environments.
C22/C276 HASTELLOY PIPES AND TUBES EQUIVALENT GRADES
| STANDARD | UNS | WNR. | EN | JIS | GOST | OR |
|---|---|---|---|---|---|---|
| Hostelloy C22 | N06022 | 2.4602 | NiCr21Mo14W | NW 6022 | – | – |
| Hostelloy C276 | N10276 | 2.4819 | NiMo16Cr15W | NW 0276 | XH65MBV | ЭП760 |
Specification of Hastelloy Alloy C22/C276 Pipes and Tubes
| Specification | Details |
|---|---|
| Hastelloy Seamless Pipes and Tubes | ASTM B622 / ASME SB622 |
| Hastelloy Welded Pipes and Tubes | ASTM B619 , ASME SB619 / ASTM B626, ASME SB626 |
| Pipe Size | Seamless \( 1/2^n – 10^n \), Welded \( 1/2^n – 48^n \) |
| Tube Size | 4 to 219mm W. T.: 0.5 to 20mm |
| Schedule | SSCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Type | Seamless / ERW / Welded / Fabricated Pipes |
| Form | Round Pipes/Tubes, Square Pipes/Tubes, Rectangular Pipe/Tubes, Coiled Tubes, “U” Shape, Pan Cake Coils, Hydraulic Tubes |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Beveled End, Treaded |
| End Protection | Plastic Caps |
| Inspection, Test Reports | Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports, Destructive Test Report, Non Destructive Test Reports |
| Packing | Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests |
| Specials | Sizes and Specifications other than above can be manufactured on request |
CHEMICAL COMPOSITION OF HASTELLOY C22/C276 SEAMLESS AND WELDED PIPES / TUBES
| Grade | Ni | C | Mo | Mn | Si | Fe | P | S | Co | Cr | W | V |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hastelloy C22 | Balance | 0.010 max | 12.5-14.5 | 0.50 max | 0.08 max | 2-6 | 0.02 max | 0.02 max | 2.5 max | 20-22.5 | 2.5-3.5 | 0.35 max |
| Hastelloy C276 | Balance | 0.01 max | 15-17 | 1.0 max | 0.08 max | 4-7 | 0.04 max | 0.03 max | 2.5 max | 14.5-16.5 | 3-4.5 | 0.35 max |
MECHANICAL PROPERTIES OF HASTELLOY C22/C276 PIPES AND TUBES
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
|---|---|---|---|---|---|
| Hastelloy C22 | 8.69 g/cm3 | 1399 °C (2550 °F) | Psi – 1,00,000, MPa – 690 | Psi – 45000, MPa – 310 | 45 % |
| Hastelloy C276 | 8.89 g/cm3 | 1370 °C (2500 °F) | Psi – 1,15,000 , MPa – 790 | Psi – 52,000 , MPa – 355 | 40 % |
PHYSICAL PROPERTIES OF HASTELLOY C22 PIPES AND TUBES
| Property | Value |
|---|---|
| Density | 0.314 lb/in\(^3\) |
| Specific Gravity | 8.69 lb/in\(^3\) |
| Specific Heat (Btu/lb/Deg F – [32-212 Deg F] | 0.1 |
| Melting Point (Deg F) | 2550 |
| Thermal Conductivity | 70 |
| Mean Coeff Thermal Expansion | 6.9 |
| Modulus of Elasticity Tension | 29.9 |
PHYSICAL PROPERTIES OF HASTELLOY C276 PIPES AND TUBES
| Physical Property | Temp., °F | British Units | Temp., °C | Metric Units |
|---|---|---|---|---|
| Density | 72 | 0.321 lb/in\(^3\) | 22 | 8.89 g/cm\(^3\) |
| Melting Range | 2415-2500 | 1323-1371 | ||
| Electrical Resistivity | 75 | 51 microhm-in. | 24 | 1.30 microhm-m |
| Mean Coefficient of Thermal Expansion | 75-200 | 6.2 microinches/in.-°F | 24-93 | 11.2 x 10\(^6\) m/m-K |
| 75-400 | 6.7 microinches/in.-°F | 24-204 | 12.0 x 10\(^6\) m/m-K | |
| 75-600 | 7.1 microinches/in.-°F | 24-316 | 12.8 x 10\(^6\) m/m-K | |
| 75-800 | 7.3 microinches/in.-°F | 24-427 | 13.2 x 10\(^6\) m/m-K | |
| 75-1000 | 7.4 microinches/in.-°F | 24-538 | 13.4 x 10\(^6\) m/m-K | |
| Thermal Conductivity | -270 | 50 Btu-in./ft.\(^2\) hr.-°F | -168 | 7.2 W/m·K |
| -100 | 60 Btu-in./ft.\(^2\) hr.-°F | -73 | 8.6 W/m·K | |
| 0 | 65 Btu-in./ft.\(^2\) hr.-°F | -18 | 9.4 W/m·K | |
| 100 | 71 Btu-in./ft.\(^2\) hr.-°F | 38 | 10.2 W/m·K | |
| 200 | 77 Btu-in./ft.\(^2\) hr.-°F | 93 | 11.1 W/m·K | |
| 400 | 90 Btu-in./ft.\(^2\) hr.-°F | 204 | 13.0 W/m·K | |
| 600 | 104 Btu-in./ft.\(^2\) hr.-°F | 316 | 15.0 W/m·K | |
| 800 | 117 Btu-in./ft.\(^2\) hr.-°F | 427 | 16.9 W/m·K | |
| 1000 | 132 Btu-in./ft.\(^2\) hr.-°F | 538 | 19.0 W/m·K | |
| Specific Heat (Calculated) | Room | 0.102 Btu/lb.-°F | Room | 427 J/kg·K |
💡 Practical Difference in Use
Use Hastelloy C22 when: maximum resistance to localized corrosion such as pitting, crevice corrosion, and stress corrosion cracking is required, especially in oxidizing and mixed chemical environments. → Example: Chemical reactors, scrubbers, heat exchangers, and equipment exposed to chlorides and aggressive acids.
Use Hastelloy C276 when: broad corrosion resistance is needed across a wide range of reducing and mixed media, including sulfuric acid, hydrochloric acid, and wet chlorine environments. → Example: Oil & gas processing systems, pollution control equipment, and chemical process piping handling mixed corrosive fluids.
Uses of Hastelloy C22 & C276 Pipes and Tubes
Hastelloy C22 and C276 are nickel-based alloys designed for severe corrosive service, offering excellent fabricability, weldability, and long-term performance in extreme operating conditions.
- Chemical Processing Equipment: Widely used for reactors, columns, heat exchangers, and transfer piping handling aggressive acids and chlorides.
- Oil & Gas Industry: Applied in offshore platforms, sour gas service, and refinery piping where corrosion resistance and reliability are critical.
- Pollution Control Systems: Used in flue gas desulfurization units, scrubbers, and waste treatment plants.
- Marine & Seawater Applications: Suitable for seawater piping, desalination plants, and marine exhaust systems due to excellent resistance to chloride-induced corrosion.
When to Choose Hastelloy C22 vs. C276?
Both alloys deliver exceptional corrosion resistance, but each excels in different service conditions. Selecting the right grade ensures optimal performance and service life.
Choose Hastelloy C22 when:
- Maximum resistance to pitting, crevice corrosion, and stress corrosion cracking is required
- The service environment contains oxidizing acids, chlorides, or mixed chemical streams
- Long-term reliability is needed in highly aggressive process conditions
Choose Hastelloy C276 when:
- Broad resistance to reducing environments such as sulfuric and hydrochloric acids is required
- Proven performance in mixed and contaminated process streams is needed
- Cost-effectiveness is preferred where extreme localized corrosion resistance of C22 is not mandatory
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