Nickel Alloy ERNiCrFe-7A PWHT
Heat-treated state
UNS N06054 · ISO S Ni 6054
PWHT = post-weld heat treated
Choose when the deposit is buttered onto low-alloy steel (SA-508/SA-533) that requires a code stress-relief cycle.
Values for the PWHT condition
Other ERNiCrFe-7A tempers and conditions
ERNiCrFe-7A is listed in 3 conditions; see the grade overview at ERNiCrFe-7A.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed deposit / wrought equivalent | Used for annealed cladding, test coupons or wrought products of the same chemistry where lowest hardness and best ductility are wanted. | 310 | 620 | 48 | 165 HB | 1.5 % IACS |
PWHTThis page Post-weld heat treated | Choose when the deposit is buttered onto low-alloy steel (SA-508/SA-533) that requires a code stress-relief cycle. | 385 | 640 | 40 | 185 HB | 1.5 % IACS |
AWDefault As-welded deposit | Standard supply/qualification condition: properties of undiluted deposit used for nuclear DMW overlays and buttering. | 400 | 655 | 40 | 195 HB | — |
What is ERNiCrFe-7A PWHT?
ERNiCrFe-7A PWHT is ERNiCrFe-7A heat treated to PWHT — choose when the deposit is buttered onto low-alloy steel (SA-508/SA-533) that requires a code stress-relief cycle. ERNiCrFe-7A PWHT has a yield strength of 385 MPa (55.8 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 51% of nickel alloy grades. Elongation at break is 40% and the elastic modulus is 207 GPa (30 Msi). ERNiCrFe-7A PWHT has a density of 8.25 g/cm³ (0.298 lb/in³), lighter than 58% of nickel alloy grades. It melts at 1,355°C (2,471 °F). AW is the default condition FabDigit quotes; PWHT is available on request or by drawing note.
Advantages
- Good corrosion resistance — 88/100, better than 81% of nickel alloy grades
ERNiCrFe-7A PWHT properties
Typical room-temperature values for ERNiCrFe-7A PWHT; 22 are specific to this condition. Other listed values are ERNiCrFe-7A reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
ERNiCrFe-7A PWHT has a density of 8.25 g/cm³ (0.298 lb/in³), lighter than 58% of nickel alloy grades. It melts at 1,355°C (2,471 °F).
Mechanical12
ERNiCrFe-7A PWHT has a yield strength of 385 MPa (55.8 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 51% of nickel alloy grades. Elongation at break is 40% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
ERNiCrFe-7A PWHT is rated for continuous service to 650°C (1,202 °F). It conducts heat at 12.2 W/m·K (7.05 BTU/hr·ft·°F), better than 68% of nickel alloy grades. Thermal expansion is 13.6 µm/m·K (7.56 µin/in·°F).
Electrical3
ERNiCrFe-7A PWHT conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 81% of nickel alloy grades.
Sustainability4
Producing a kilogram of ERNiCrFe-7A PWHT takes about 135 MJ of energy and emits 12.5 kg of CO₂ — less than 84% of nickel alloy grades. Typical recycled content is 20%.
Manufacturability8
ERNiCrFe-7A PWHT's machinability is poor (27/100, better than 80% of nickel alloy grades); weldability very good (80/100); formability good (58/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERNiCrFe-7A PWHT
Is ERNiCrFe-7A easy to machine?
Machine weld overlays with sharp positive-rake carbide, low speed/heavy feed and flood coolant — the deposit work-hardens rapidly and is gummy like Alloy 690.
Can ERNiCrFe-7A be welded?
Use GTAW (or pulsed GMAW/hot-wire) with low heat input, interpass ≤150 °C, minimal weaving and tight dilution control; buff/grind between passes and keep base-metal S+P low to avoid ductility-dip and hot cracking.
Can ERNiCrFe-7A be formed, bent or molded?
Supplied as cold-drawn wire or strip; the alloy cold-forms like Alloy 690 with high forming loads and requires intermediate anneals at ~1030–1080 °C.
What surface finishes work on ERNiCrFe-7A?
Pickle or lightly grind and passivate; no anodising — electropolishing or mechanical polishing gives the smooth, low-crevice surface preferred in primary-circuit service.
ERNiCrFe-7A 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 |
|---|---|---|
| Clow C to limit carbide precipitation | ≤ 0.04 | 0.02 |
| Crhigh Cr gives PWSCC resistance | 28 – 31.5 | 30 |
| Fe | 7 – 11 | 9.5 |
| Mn | 0.05 – 1 | 0.3 |
| Si | ≤ 0.5 | 0.15 |
| Nbcontrolled Nb addition distinguishing 52M from Alloy 52 | 0.5 – 1 | 0.8 |
| Ti | ≤ 1 | 0.5 |
| Al | ≤ 1.1 | 0.5 |
| Cu | ≤ 0.3 | 0.05 |
| Mo | ≤ 0.5 | 0.05 |
| Skept very low for hot-crack resistance | ≤ 0.02 | 0 |
| P | ≤ 0.02 | 0.01 |
| Nibalance, Ni ≥54 % per AWS A5.14 | ≥ 54 (balance) | — |
ERNiCrFe-7A PWHT — frequently asked
What is ERNiCrFe-7A PWHT used for?
ERNiCrFe-7A PWHT is typically used for nuclear vessel nozzle buttering, dissimilar metal weld overlays and PWR primary system repairs. In short: hot-crack-resistant Alloy 52; nuclear buttering filler; tighter Nb control.
What is the yield strength of ERNiCrFe-7A PWHT?
ERNiCrFe-7A PWHT has a typical yield strength of 385 MPa (55.8 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 51% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is ERNiCrFe-7A PWHT easy to machine?
Not especially — machinability is rated poor (27/100, better than 80% of nickel alloy grades). Machine weld overlays with sharp positive-rake carbide, low speed/heavy feed and flood coolant — the deposit work-hardens rapidly and is gummy like Alloy 690.
Can ERNiCrFe-7A PWHT be welded?
Yes — weldability is rated very good (80/100). Use GTAW (or pulsed GMAW/hot-wire) with low heat input, interpass ≤150 °C, minimal weaving and tight dilution control; buff/grind between passes and keep base-metal S+P low to avoid ductility-dip and hot cracking.
What surface finishes work on ERNiCrFe-7A PWHT?
Pickle or lightly grind and passivate; no anodising — electropolishing or mechanical polishing gives the smooth, low-crevice surface preferred in primary-circuit service.
Can ERNiCrFe-7A PWHT be formed, bent or molded?
Supplied as cold-drawn wire or strip; the alloy cold-forms like Alloy 690 with high forming loads and requires intermediate anneals at ~1030–1080 °C.
What is the maximum service temperature of ERNiCrFe-7A PWHT?
ERNiCrFe-7A PWHT 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 ERNiCrFe-7A-AW and ERNiCrFe-7A-SA?
AW is the default condition — standard supply/qualification condition: properties of undiluted deposit used for nuclear DMW overlays and buttering. SA: used for annealed cladding, test coupons or wrought products of the same chemistry where lowest hardness and best ductility are wanted. Yield strength is 400 MPa in AW versus 310 MPa in SA.
Sources
- AWS A5.14/A5.14M — Nickel and Nickel-Alloy Bare Welding Electrodes and Rods — AWS (2018)
- ASME BPVC Section II Part C, SFA-5.14 — ASME (2023)
- ASME BPVC Section II Part D — physical property tables, N06690/N06054 family — ASME (2023)
- ASM Handbook Vol.2 — Properties of Nonferrous Alloys (Ni-Cr-Fe alloys) — ASM International (1990)
- Alloy 52M (ERNiCrFe-7A) welding filler metal datasheet — Ni-alloy filler producers (SMC/Böhler/Special Metals type) (2022)
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.