Nickel Alloy ERNiCrMo-7-SA (Solution Annealed)
Heat-treated state
UNS N06455 · ISO S Ni 6455
Optional PWHT that homogenizes dendritic Mo segregation and maximizes corrosion resistance and ductility in critical vessels.
Values for the SA condition
Other ERNiCrMo-7 tempers and conditions
ERNiCrMo-7 is listed in 3 conditions; see the grade overview at ERNiCrMo-7.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SAThis page Solution Annealed | Optional PWHT that homogenizes dendritic Mo segregation and maximizes corrosion resistance and ductility in critical vessels. | 400 | 690 | 50 | 175 HB | 1.4 % IACS |
As Welded | Higher-deposition spool-fed condition for thicker sections; slightly lower ductility and toughness than GTAW due to higher heat input and dilution. | 460 | 705 | 36 | 196 HB | 1.4 % IACS |
AWDefault As-welded deposit | Standard delivery condition of the joint: use when C-4 weldments must go into corrosive service without post-weld solution annealing. | 470 | 720 | 40 | 200 HB | — |
What is ERNiCrMo-7-SA?
ERNiCrMo-7-SA is ERNiCrMo-7 heat treated to SA — optional PWHT that homogenizes dendritic Mo segregation and maximizes corrosion resistance and ductility in critical vessels. ERNiCrMo-7-SA has a yield strength of 400 MPa (58 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 50% and the elastic modulus is 211 GPa (30.6 Msi). ERNiCrMo-7-SA has a density of 8.64 g/cm³ (0.312 lb/in³), heavier than 70% of nickel alloy grades. It melts at 1,338°C (2,440 °F). AW is the default condition FabDigit quotes; SA is available on request or by drawing note.
Advantages
- Good corrosion resistance — 94/100, better than 97% of nickel alloy grades
- Readily welded — 90/100, better than 96% of nickel alloy grades
- Ductile — tolerates forming and impact — 50%, better than 88% of nickel alloy grades
ERNiCrMo-7-SA properties
Typical room-temperature values for ERNiCrMo-7-SA; 21 are specific to this condition. Other listed values are ERNiCrMo-7 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
ERNiCrMo-7-SA has a density of 8.64 g/cm³ (0.312 lb/in³), heavier than 70% of nickel alloy grades. It melts at 1,338°C (2,440 °F).
Mechanical14
ERNiCrMo-7-SA has a yield strength of 400 MPa (58 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 50% and the elastic modulus is 211 GPa (30.6 Msi).
Thermal6
ERNiCrMo-7-SA is rated for continuous service to 650°C (1,202 °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
ERNiCrMo-7-SA conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (94/100), better than 97% of nickel alloy grades.
Sustainability4
Producing a kilogram of ERNiCrMo-7-SA takes about 165 MJ of energy and emits 14 kg of CO₂ — more than 54% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability7
ERNiCrMo-7-SA's machinability is poor (20/100, better than 53% of nickel alloy grades); weldability excellent (90/100); formability good (68/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERNiCrMo-7-SA
Is ERNiCrMo-7 easy to machine?
Weld metal machines like alloy C-4: gummy and work-hardening — use rigid setups, positive-rake carbide, heavy constant feed, low SFM and flood coolant; avoid dwelling.
Can ERNiCrMo-7 be welded?
GTAW/GMAW/PAW with 100 % Ar (Ar+He for thick sections); keep heat input below ~1.5 kJ/mm, interpass ≤ 100 °C, no preheat, stringer beads and full back-purge; clean to bright metal to avoid porosity and hot cracking.
Can ERNiCrMo-7 be formed, bent or molded?
Supplied as drawn wire; deposits are ductile enough for hammer testing and cold straightening but work-harden rapidly, so cold forming of weldments needs intermediate anneals.
What surface finishes work on ERNiCrMo-7?
Pickle or bead-blast plus passivation to remove heat tint — chromium-depleted oxide is the weak point for pitting; electropolishing gives the best as-welded corrosion performance.
ERNiCrMo-7 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 | 15.5 |
| Fe | ≤ 3 | 1.5 |
| Tistabilizer against grain-boundary carbide precipitation | ≤ 0.7 | 0.3 |
| Co | ≤ 2 | 0.5 |
| Mn | ≤ 1 | 0.4 |
| Si | ≤ 0.08 | 0.04 |
| C | ≤ 0.02 | 0.01 |
| Cu | ≤ 0.5 | 0.05 |
| P | ≤ 0.04 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Other (each)total of unspecified elements per AWS A5.14 | ≤ 0.5 | — |
| Nibalance, typically ~65 % | balance | — |
ERNiCrMo-7-SA — frequently asked
What is ERNiCrMo-7-SA used for?
ERNiCrMo-7-SA is typically used for chemical process piping, as-welded corrosive service equipment and flue gas desulfurization systems. In short: matched filler for C-4; as-welded corrosion resistance; no PWHT required.
What is the yield strength of ERNiCrMo-7-SA?
ERNiCrMo-7-SA has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 56% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is ERNiCrMo-7-SA easy to machine?
Not especially — machinability is rated poor (20/100, better than 53% of nickel alloy grades). Weld metal machines like alloy C-4: gummy and work-hardening — use rigid setups, positive-rake carbide, heavy constant feed, low SFM and flood coolant; avoid dwelling.
Can ERNiCrMo-7-SA be welded?
Yes — weldability is rated excellent (90/100). GTAW/GMAW/PAW with 100 % Ar (Ar+He for thick sections); keep heat input below ~1.5 kJ/mm, interpass ≤ 100 °C, no preheat, stringer beads and full back-purge; clean to bright metal to avoid porosity and hot cracking.
What surface finishes work on ERNiCrMo-7-SA?
Pickle or bead-blast plus passivation to remove heat tint — chromium-depleted oxide is the weak point for pitting; electropolishing gives the best as-welded corrosion performance.
Can ERNiCrMo-7-SA be formed, bent or molded?
Supplied as drawn wire; deposits are ductile enough for hammer testing and cold straightening but work-harden rapidly, so cold forming of weldments needs intermediate anneals.
What is the maximum service temperature of ERNiCrMo-7-SA?
ERNiCrMo-7-SA is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ERNiCrMo-7-AW and ERNiCrMo-7-SA?
AW is the default condition — standard delivery condition of the joint: use when C-4 weldments must go into corrosive service without post-weld solution annealing. SA: optional PWHT that homogenizes dendritic Mo segregation and maximizes corrosion resistance and ductility in critical vessels. Yield strength is 470 MPa in AW versus 400 MPa in SA.
Sources
- AWS A5.14/A5.14M — Nickel and Nickel-Alloy Bare Welding Electrodes and Rods — AWS (2018)
- ASTM B622/B575 — UNS N06455 (alloy C-4) chemistry and properties — ASTM (2022)
- ISO 18274 / EN — S Ni 6455 (NiCr16Mo16Ti) — ISO (2010)
- Alloy C-4 (N06455) technical data — physical and corrosion properties — VDM Metals / Haynes International (2020)
- ASM Handbook Vol.2 — Properties of Nonferrous Alloys (Ni-Cr-Mo alloys) — ASM International (1990)
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.