Nickel Alloy Hastelloy C276 Stress Relieved
Heat-treated state
UNS N10276 · EN 2.4819, NiMo16Cr15W · GB NS3304, NS334 · also Hastelloy C-276
Used on cold-formed springs and tube to reduce residual stress while retaining most of the cold-work strength; avoid long holds that risk intermetallic precipitation.
Values for the Stress Relieved condition
Other Hastelloy C276 tempers and conditions
Hastelloy C276 is listed in 5 conditions; see the grade overview at Hastelloy C276.
- Solution Annealed
- Hot Worked
- As Welded
- Stress Relieved
- Cold Worked
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution AnnealedDefault 1120–1175 °C solution treat, rapid quench (ASTM B575/B574/B622) | Standard stocked condition for plate, sheet, tube and bar — maximum corrosion resistance and ductility for forming and welding. | 360 | 790 | 60 | 194 HB | — |
hot-rolled or forged bar and billet, as-worked (ASTM B574 hot-worked class) | Pick for large-section bar and forgings where slightly higher strength is acceptable and full solution annealing is not specified. | 400 | 800 | 50 | 17 HRC | 1.3 % IACS |
all-weld-metal properties, matching ERNiCrMo-4 / ENiCrMo-4 filler | Reference condition for weld-joint design and filler procurement; C276 is normally used as-welded without post-weld heat treatment. | 490 | 760 | 40 | 12 HRC | 1.3 % IACS |
Stress RelievedThis page cold-worked product given a low-temperature (≈ 480–650 °C) relief cycle | Used on cold-formed springs and tube to reduce residual stress while retaining most of the cold-work strength; avoid long holds that risk intermetallic precipitation. | 740 | 970 | 28 | 28 HRC | 1.3 % IACS |
strain-hardened bar, wire and tube (no final anneal) | Choose when higher strength and hardness are needed (springs, fasteners, precision tube) and heavy forming or maximum SCC margin is not required. | 800 | 1,030 | 25 | 30 HRC | — |
What is Hastelloy C276 Stress Relieved?
Hastelloy C276 Stress Relieved is Hastelloy C276 heat treated to Stress Relieved — used on cold-formed springs and tube to reduce residual stress while retaining most of the cold-work strength; avoid long holds that risk intermetallic precipitation. Hastelloy C276 Stress Relieved has a yield strength of 740 MPa (107 ksi) and a tensile strength of 970 MPa (141 ksi) — stronger than 82% of nickel alloy grades. Elongation at break is 28% and the elastic modulus is 205 GPa (29.7 Msi). Hastelloy C276 Stress Relieved has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 88% of nickel alloy grades. It melts at 1,323°C (2,413 °F). Solution Annealed is the default condition FabDigit quotes; Stress Relieved is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 85% of nickel alloy grades
- High strength — 740 MPa (107 ksi), better than 82% of nickel alloy grades
- Good corrosion resistance — 88/100, better than 81% of nickel alloy grades
Limitations
- Limited service temperature — 480°C (896 °F), worse than 82% of nickel alloy grades
Hastelloy C276 Stress Relieved properties
Typical room-temperature values for Hastelloy C276 Stress Relieved; 22 are specific to this condition. Other listed values are Hastelloy C276 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Hastelloy C276 Stress Relieved has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 88% of nickel alloy grades. It melts at 1,323°C (2,413 °F).
Mechanical14
Hastelloy C276 Stress Relieved has a yield strength of 740 MPa (107 ksi) and a tensile strength of 970 MPa (141 ksi) — stronger than 82% of nickel alloy grades. Elongation at break is 28% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
Hastelloy C276 Stress Relieved is rated for continuous service to 480°C (896 °F). It conducts heat at 10.2 W/m·K (5.89 BTU/hr·ft·°F), worse than 79% of nickel alloy grades. Thermal expansion is 11.2 µm/m·K (6.22 µin/in·°F).
Electrical3
Hastelloy C276 Stress Relieved conducts electricity at 1.3 % IACS, worse than 83% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 81% of nickel alloy grades.
Sustainability3
Producing a kilogram of Hastelloy C276 Stress Relieved takes about 210 MJ of energy and emits 14 kg of CO₂ — more than 81% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
Hastelloy C276 Stress Relieved's machinability is poor (22/100, better than 64% of nickel alloy grades); weldability very good (78/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Hastelloy C276 Stress Relieved
Is Hastelloy C276 easy to machine?
Low speed, heavy positive-rake carbide or ceramic tooling, rigid setup, generous flood coolant and constant feed — the alloy work-hardens fast and will glaze if the tool dwells.
Can Hastelloy C276 be welded?
Excellent with GTAW/GMAW/SMAW using matching ERNiCrMo-4; keep heat input and interpass temperature low, no preheat, no PWHT required, and clean off all oxide/sulfur contamination first.
Can Hastelloy C276 be formed, bent or molded?
Very ductile but roughly twice the forming load of 304 stainless; cold form with generous radii and interstage anneal at 1120–1175 °C followed by rapid cooling for heavy work.
What surface finishes work on Hastelloy C276?
Pickle/passivate or electropolish for maximum corrosion performance; no anodizing — mechanical polishing and glass-bead blasting are common, and any weld heat tint should be removed.
Hastelloy C276 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Mo | 15 – 17 | 16 |
| Cr | 14.5 – 16.5 | 15.5 |
| Fe | 4 – 7 | 5.5 |
| W | 3 – 4.5 | 3.8 |
| Co | ≤ 2.5 | 1 |
| Mn | ≤ 1 | 0.5 |
| V | ≤ 0.35 | 0.1 |
| Si | ≤ 0.08 | 0.04 |
| C | ≤ 0.01 | 0.01 |
| P | ≤ 0.04 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Nibalance, typically 55–59 % | balance | — |
Hastelloy C276 Stress Relieved — frequently asked
What is Hastelloy C276 Stress Relieved used for?
Hastelloy C276 Stress Relieved is typically used for hot hydrochloric acid piping, FGD scrubbers and ducting, pulp and paper bleach plant equipment, sulfuric acid heat exchangers, pharmaceutical reactor internals and sour gas wellhead components. In short: severe-corrosion nickel alloy.
What is the yield strength of Hastelloy C276 Stress Relieved?
Hastelloy C276 Stress Relieved has a typical yield strength of 740 MPa (107 ksi) and a tensile strength of 970 MPa (141 ksi) — stronger than 82% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Hastelloy C276 Stress Relieved easy to machine?
Not especially — machinability is rated poor (22/100, better than 64% of nickel alloy grades). Low speed, heavy positive-rake carbide or ceramic tooling, rigid setup, generous flood coolant and constant feed — the alloy work-hardens fast and will glaze if the tool dwells.
Can Hastelloy C276 Stress Relieved be welded?
Yes — weldability is rated very good (78/100). Excellent with GTAW/GMAW/SMAW using matching ERNiCrMo-4; keep heat input and interpass temperature low, no preheat, no PWHT required, and clean off all oxide/sulfur contamination first.
What surface finishes work on Hastelloy C276 Stress Relieved?
Pickle/passivate or electropolish for maximum corrosion performance; no anodizing — mechanical polishing and glass-bead blasting are common, and any weld heat tint should be removed.
Can Hastelloy C276 Stress Relieved be formed, bent or molded?
Very ductile but roughly twice the forming load of 304 stainless; cold form with generous radii and interstage anneal at 1120–1175 °C followed by rapid cooling for heavy work.
What is the maximum service temperature of Hastelloy C276 Stress Relieved?
Hastelloy C276 Stress Relieved is rated for continuous use to about 480°C (896 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in Hastelloy C276 Stress Relieved?
Yes — Hastelloy C276 Stress Relieved is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B575 — Ni-Cr-Mo alloy plate, sheet and strip — ASTM International (2022)
- ASTM B574 — Ni-Mo-Cr alloy rod, bar and wire — ASTM International (2021)
- ASTM B622 / B619 — Ni-Cr-Mo alloy seamless and welded pipe & tube — ASTM International (2021)
- HASTELLOY C-276 alloy principal features and properties — Haynes International (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- GB/T 15007 / NS334 — SAC (2017)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.