Nickel Alloy Hastelloy C-4
UNS N06455 · EN 2.4610, NiMo16Cr16Ti
Hastelloy C-4 (UNS N06455, 2.4610, NiMo16Cr16Ti) is a titanium-stabilized Ni-Mo-Cr alloy that resists stress-corrosion cracking and keeps stable corrosion resistance in the as-welded condition.
Reference datasheet — Hastelloy C-4 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SA condition
Hastelloy C-4 tempers and conditions
Hastelloy C-4 is supplied in 6 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
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 |
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?
Hastelloy C-4 (UNS N06455, 2.4610, NiMo16Cr16Ti) is a titanium-stabilized Ni-Mo-Cr alloy that resists stress-corrosion cracking and keeps stable corrosion resistance in the as-welded condition. It is used for welded chemical equipment in SA, HF-A, CD-A, CW, SR and AW conditions, supplied as plate, sheet, pipe, bar and forgings. Annealed properties are 400 MPa yield, 785 MPa tensile, 55% elongation and 195 HB (90 HRB), with a maximum service temperature of 1000 °C. Machinability is low (score 18) and availability is limited because it historically preceded C-276 and C-22, which are the usual current alternatives. Hastelloy C-4 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). Hastelloy C-4 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 785 MPa (114 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 55% and the elastic modulus is 211 GPa (30.6 Msi).
What is Hastelloy C-4 used for?
- chemical process piping
- welded pressure vessels
- high-temperature HCl service
- pickling equipment
Advantages
- Ductile — tolerates forming and impact — 55%, better than 93% of nickel alloy grades
- Good corrosion resistance — 92/100, better than 91% of nickel alloy grades
- Readily welded — 85/100, better than 83% of nickel alloy grades
- Forms and bends easily — 75/100, better than 82% of nickel alloy grades
- High service temperature — 1,000°C (1,832 °F), better than 79% of nickel alloy grades
Hastelloy C-4 properties
Typical room-temperature values for Hastelloy C-4-SA; bars are the position among nickel alloy grades.
Physical3
Hastelloy C-4 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 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 785 MPa (114 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 55% and the elastic modulus is 211 GPa (30.6 Msi).
Thermal6
Hastelloy C-4 is rated for continuous service to 1,000°C (1,832 °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 conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 91% of nickel alloy grades.
Sustainability4
Producing a kilogram of Hastelloy C-4 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's machinability is poor (18/100, worse than 61% of nickel alloy grades); weldability excellent (85/100); formability very good (75/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. Hastelloy C-4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Hastelloy C-4
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.
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 |
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.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Hastelloy C-4 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06455
- EN / DIN / Werkstoff-Nr.
- 2.4610NiMo16Cr16Ti
How much does Hastelloy C-4 cost?
Hastelloy C-4 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Hastelloy C-4 — frequently asked
What is Hastelloy C-4 used for?
Hastelloy C-4 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?
Hastelloy C-4 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 785 MPa (114 ksi) — stronger than 56% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is Hastelloy C-4 easy to machine?
Not especially — machinability is rated poor (18/100, worse than 61% 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 be welded?
Yes — weldability is rated excellent (85/100). 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?
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 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?
Hastelloy C-4 is rated for continuous use to about 1,000°C (1,832 °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.
How much does Hastelloy C-4 cost?
Hastelloy C-4 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.