Nickel Alloy Hastelloy C-4-SR (Stress relieved)
Heat-treated state
UNS N06455 · EN 2.4610, NiMo16Cr16Ti
Intermediate condition for springs/fasteners where residual stress must be reduced without losing all cold-work strength.
Values for the SR condition
Other Hastelloy C-4 tempers and conditions
Hastelloy C-4 is listed in 6 conditions; see the grade overview at Hastelloy C-4.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot finished and solution annealed | Choose for heavy sections, forged valve bodies and large-diameter bar where hot working precedes the anneal. | 370 | 760 | 55 | 185 HB | 1.4 % IACS |
SADefault Solution annealed | Standard supply condition for plate, sheet, tube and forgings; maximum corrosion resistance and ductility. | 400 | 785 | 55 | 195 HB | — |
Cold drawn and annealed bar / tube | Pick for close-tolerance bar, instrument tubing and machined parts needing a bright, dimensionally accurate annealed product. | 420 | 800 | 50 | 205 HB | 1.4 % IACS |
As-welded deposit | Design case for welded joints — C-4 keeps HAZ corrosion resistance without post-weld solution anneal. | 430 | 750 | 40 | 200 HB | 1.4 % IACS |
SRThis page Stress relieved | Intermediate condition for springs/fasteners where residual stress must be reduced without losing all cold-work strength. | 720 | 950 | 20 | 27 HRC | 1.4 % IACS |
Cold worked | Use where higher strength and hardness are needed (springs, fasteners, wire) and the extra cold work is acceptable for corrosion service. | 800 | 1,000 | 15 | 30 HRC | 1.4 % IACS |
What is Hastelloy C-4-SR?
Hastelloy C-4-SR is Hastelloy C-4 heat treated to SR — intermediate condition for springs/fasteners where residual stress must be reduced without losing all cold-work strength. Hastelloy C-4-SR has a yield strength of 720 MPa (104 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 82% of nickel alloy grades. Elongation at break is 20% and the elastic modulus is 211 GPa (30.6 Msi). Hastelloy C-4-SR has a density of 8.64 g/cm³ (0.312 lb/in³), heavier than 70% of nickel alloy grades. It melts at 1,350°C (2,462 °F). SA is the default condition FabDigit quotes; SR is available on request or by drawing note.
Advantages
- Good corrosion resistance — 90/100, better than 85% of nickel alloy grades
- High strength — 720 MPa (104 ksi), better than 82% of nickel alloy grades
Limitations
- Limited ductility — 20%, worse than 76% of nickel alloy grades
- Limited service temperature — 540°C (1,004 °F), worse than 75% of nickel alloy grades
Hastelloy C-4-SR properties
Typical room-temperature values for Hastelloy C-4-SR; 21 are specific to this condition. Other listed values are Hastelloy C-4 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Hastelloy C-4-SR has a density of 8.64 g/cm³ (0.312 lb/in³), heavier than 70% of nickel alloy grades. It melts at 1,350°C (2,462 °F).
Mechanical14
Hastelloy C-4-SR has a yield strength of 720 MPa (104 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 82% of nickel alloy grades. Elongation at break is 20% and the elastic modulus is 211 GPa (30.6 Msi).
Thermal6
Hastelloy C-4-SR is rated for continuous service to 540°C (1,004 °F). It conducts heat at 10.1 W/m·K (5.84 BTU/hr·ft·°F), worse than 84% of nickel alloy grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
Hastelloy C-4-SR conducts electricity at 1.4 % IACS, worse than 78% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (90/100), better than 85% of nickel alloy grades.
Sustainability4
Producing a kilogram of Hastelloy C-4-SR takes about 170 MJ of energy and emits 13 kg of CO₂ — more than 61% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
Hastelloy C-4-SR's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability very good (80/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Hastelloy C-4-SR
Is Hastelloy C-4 easy to machine?
Machines like other C-type Hastelloys: rigid setup, positive-rake carbide, slow speed (~15–25 m/min), heavy constant feed and flood coolant to avoid work-hardened glazing.
Can Hastelloy C-4 be welded?
Readily welded by GTAW/GMAW/PAW with matching ERNiCrMo-7 filler, low heat input and no preheat; the Ti stabilization means no post-weld solution anneal is required for corrosion service.
Can Hastelloy C-4 be formed, bent or molded?
Formed cold in the annealed condition but work-hardens rapidly — allow extra power, generous bend radii and intermediate anneals at 1065–1120 °C with rapid quench; hot work 900–1200 °C.
What surface finishes work on Hastelloy C-4?
Not anodizable; grind/pickle to remove weld oxide and embedded iron, then passivate or electropolish for optimum corrosion performance and hygienic finish.
Hastelloy C-4 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 |
|---|---|---|
| Cr | 14 – 18 | 16 |
| Mo | 14 – 17 | 16 |
| Fe | ≤ 3 | 1 |
| Co | ≤ 2 | — |
| Ticarbide stabilizer, key to C-4 thermal stability | ≤ 0.7 | 0.35 |
| Mn | ≤ 1 | — |
| Si | ≤ 0.08 | — |
| C | ≤ 0.02 | — |
| P | ≤ 0.03 | — |
| S | ≤ 0.01 | — |
| Nibalance, nominally ~65 % | balance | — |
Hastelloy C-4-SR — frequently asked
What is Hastelloy C-4-SR used for?
Hastelloy C-4-SR is typically used for chemical process piping, welded pressure vessels, high-temperature HCl service and pickling equipment. In short: ti-stabilized C-family alloy; stable corrosion after welding; no post-weld anneal required.
What is the yield strength of Hastelloy C-4-SR?
Hastelloy C-4-SR has a typical yield strength of 720 MPa (104 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 82% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is Hastelloy C-4-SR easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Machines like other C-type Hastelloys: rigid setup, positive-rake carbide, slow speed (~15–25 m/min), heavy constant feed and flood coolant to avoid work-hardened glazing.
Can Hastelloy C-4-SR be welded?
Yes — weldability is rated very good (80/100). Readily welded by GTAW/GMAW/PAW with matching ERNiCrMo-7 filler, low heat input and no preheat; the Ti stabilization means no post-weld solution anneal is required for corrosion service.
What surface finishes work on Hastelloy C-4-SR?
Not anodizable; grind/pickle to remove weld oxide and embedded iron, then passivate or electropolish for optimum corrosion performance and hygienic finish.
Can Hastelloy C-4-SR be formed, bent or molded?
Formed cold in the annealed condition but work-hardens rapidly — allow extra power, generous bend radii and intermediate anneals at 1065–1120 °C with rapid quench; hot work 900–1200 °C.
What is the maximum service temperature of Hastelloy C-4-SR?
Hastelloy C-4-SR is rated for continuous use to about 540°C (1,004 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Hastelloy C-4-SA and Hastelloy C-4-CW?
SA is the default condition — standard supply condition for plate, sheet, tube and forgings; maximum corrosion resistance and ductility. CW: use where higher strength and hardness are needed (springs, fasteners, wire) and the extra cold work is acceptable for corrosion service. Yield strength is 400 MPa in SA versus 800 MPa in CW.
Sources
- ASTM B575 — Ni-Cr-Mo alloy plate, sheet and strip (UNS N06455) — ASTM International (2022)
- ASTM B574 / B622 — N06455 rod, bar and seamless tube — ASTM International (2021)
- DIN 17744 / VdTÜV Wb 400 — NiMo16Cr16Ti (2.4610) — DIN / VdTÜV (2002)
- HASTELLOY C-4 alloy principal features and data — Haynes International (2020)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys, corrosion-resistant nickel alloys — ASM International (1990)
- GB/T 15007 (NS3304) — SAC (2008)
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.