Hastelloy C22 & C276 Fasteners
Technical data for high-nickel corrosion-resistant nuts, bolts and studs — standards, chemical composition, mechanical properties, solution annealing, quenching, applications and material selection.
Hastelloy C22 vs C276 — Technical Overview
Both alloys are nickel-chromium-molybdenum corrosion-resistant alloys. C22 is highly resistant to oxidizing and non-oxidizing chemicals, pitting, crevice attack and stress-corrosion cracking. C276 also provides strong resistance to oxidizing and non-oxidizing acids, chloride pitting/crevice attack and sour-service cracking. C22 has higher chromium than C276, supporting strong oxidizing-media and chloride-pitting resistance.
HASTELLOY C22
UNS N06022- Nickel-chromium-molybdenum-tungsten alloy
- Higher chromium than C276
- Excellent resistance to oxidizing and non-oxidizing media
- Very high resistance to chloride pitting and crevice corrosion
- Excellent stress-corrosion cracking resistance
HASTELLOY C276
UNS N10276- Nickel-chromium-molybdenum-tungsten alloy
- Very low carbon and silicon
- Excellent resistance across many corrosive chemicals
- Strong chloride pitting and crevice resistance
- Strong sulfide and stress-corrosion cracking resistance
Standards, UNS & International Designations
| Grade | UNS | ASTM / ASME material references | DIN / EN designation | Other references |
|---|---|---|---|---|
| Hastelloy C22 | N06022 | ASTM B574 / ASME SB574 — rod & bar ASTM B564-25 / ASME SB564 — forgings | 2.4602 / NiCr21Mo14W | NACE MR0175; ASME codes for applicable product forms |
| Hastelloy C276 | N10276 | ASTM B574 / ASME SB574 — rod & bar ASTM B564-25 / ASME SB564 — forgings | 2.4819 / NiMo16Cr15W | NACE MR0175 / ISO 15156; ASME codes for applicable product forms |
Chemical Composition — Both Grades
Hastelloy C22
N06022| Element | Composition wt.% |
|---|---|
| Nickel | Balance |
| Chromium | 20.0–22.5 |
| Molybdenum | 12.5–14.5 |
| Iron | 2.0–6.0 |
| Tungsten | 2.5–3.5 |
| Cobalt | 2.5 max. |
| Manganese | 0.5 max. |
| Silicon | 0.08 max. |
| Carbon | 0.01 max. |
| Vanadium | 0.35 max. |
| Copper | 0.5 max. |
Hastelloy C276
N10276| Element | Composition wt.% |
|---|---|
| Nickel | Balance |
| Chromium | 14.5–16.5 |
| Molybdenum | 15.0–17.0 |
| Iron | 4.0–7.0 |
| Tungsten | 3.0–4.5 |
| Cobalt | 2.5 max. |
| Manganese | 1.0 max. |
| Silicon | 0.08 max. |
| Carbon | 0.01 max. |
| Vanadium | 0.35 max. |
| Copper | 0.5 max. |
Composition limits are based on ASTM B574; exact supplied chemistry should be verified from the MTC.
Mechanical Properties — Solution-Annealed Material
| Property | Hastelloy C22 — UNS N06022 | Hastelloy C276 — UNS N10276 |
|---|---|---|
| Tensile strength, minimum | 690 MPa / 100 ksi | 690 MPa / 100 ksi |
| 0.2% yield strength, minimum | 310 MPa / 45 ksi | 283 MPa / 41 ksi |
| Elongation, minimum | 45% | 40% |
Solution Annealing & Quenching
| Parameter | Hastelloy C22 | Hastelloy C276 |
|---|---|---|
| Solution annealing temperature | 1121°C (2050°F) | 1121°C (2050°F) |
| Typical hold time | 10–30 minutes, depending on section thickness | 10–30 minutes, depending on section thickness |
| Cooling | Water quenching advised | Water quenching advised |
| Alternative cooling | Rapid air cooling feasible for structures thinner than 10 mm | Rapid air cooling feasible for structures thinner than 10 mm |
Key Features & Corrosion Performance
C22 is designed for resistance to both oxidizing and non-oxidizing chemicals; C276 also provides broad severe-corrosion resistance.
Both alloys resist chloride-induced pitting, crevice corrosion and stress-corrosion cracking.
C276 is specifically noted for very low carbon and silicon contents and strong weldability.
| ASTM G48 acidified 6% FeCl3 comparison | C276 | C22 |
|---|---|---|
| Critical pitting temperature | >150°C | >150°C |
| Critical crevice temperature | 55°C | 80°C |
Laboratory comparison data reported by Haynes; not universal allowable design temperatures or field corrosion limits.
Applications
Chemical Processing
Reactors, heat exchangers, columns and severe corrosive-service equipment.
Oil & Gas / Sour Service
Applications requiring resistance to sulfide stress cracking, chloride SCC and aggressive process environments.
Pollution Control
Flue-gas scrubbers and other aggressive wet-process environments.
Petrochemical
High-corrosion process equipment and connections where nickel-alloy fasteners are specified.
Marine / Chloride Service
Severe chloride-bearing environments, subject to engineering qualification.
Custom Industrial Fasteners
Bolts, nuts and studs manufactured to drawings, dimensions, thread and certification requirements.
Why Aanuraj Fasteners?
Focused on stainless steel, nickel alloys, duplex and exotic-grade threaded fasteners.
Aanuraj's existing Hastelloy page states supply from imported non-Chinese material with EN 10204 3.1 & 3.2 certification.
Requirements can be matched to grade, size, thread, length, standard, drawing and certification.
Material chemistry, mechanical requirements, heat-treatment records and MTC documentation can be specified as required.
Supporting chemical, petrochemical, oil & gas, power and demanding engineering applications.
Discuss grade selection, dimensions, thread form, quantity, drawing and application requirements.
3 Important Questions About Hastelloy C22 & C276
C22 has higher chromium and particularly strong oxidizing-media and chloride-pitting resistance. C276 has higher molybdenum/tungsten and broad severe-corrosion resistance.
No. Chemistry, mechanical requirements and corrosion-performance profiles differ. Selection should follow the actual process environment and project specification.
Define the complete fastener requirement. ASTM B574/B564 can identify the material/product form; dimensions, thread, testing, heat treatment and certification must be specified as applicable.
Hastelloy Fasteners — Technical SEO Topics
Aanuraj Fasteners supplies Hastelloy C22 and C276 bolts, nuts and studs for chemical processing, petrochemical, oil & gas and other demanding corrosion-service applications. This page provides technical reference information for UNS N06022 and N10276, including material standards, chemical composition, mechanical requirements, heat treatment and fastener selection.
High Nickel Grade — Buy Online
Check available Hastelloy C276 hex bolts and hex nuts online. For C22, C276 studs, custom sizes, project quantities or certification requirements, contact Aanuraj.
Hastelloy C276 — Hex Bolts
BUY C276 HEX BOLTS ONLINE →Hastelloy C276 — Hex Nuts
BUY C276 HEX NUTS ONLINE →Technical References
ASTM B574-23 — low-carbon nickel-chromium-molybdenum alloy rod/bar requirements including N10276 and N06022. ASTM B564-25 — nickel alloy forgings including N10276 and N06022. Haynes International — C22 and C276 technical data, heat treatment and specifications. Aanuraj Fasteners — existing Hastelloy product page.