Nickel Alloy ERNiCrFe-7 PWHT
Heat-treated state
UNS N06052 · ISO S Ni 6052 · also Filler Metal 52
PWHT = post-weld heat treated
Use when the joint contains low-alloy ferritic steel requiring code-mandated stress relief; slight strength drop, toughness retained.
Values for the PWHT condition
Other ERNiCrFe-7 tempers and conditions
ERNiCrFe-7 is listed in 3 conditions; see the grade overview at ERNiCrFe-7.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWHTThis page Post-weld heat treated | Use when the joint contains low-alloy ferritic steel requiring code-mandated stress relief; slight strength drop, toughness retained. | 390 | 630 | 42 | 175 HB | 1.5 % IACS |
As-welded deposit made by GMAW/pulsed MIG or hot-wire GTAW cladding | Pick for high-deposition cladding and buttering layers; slightly higher dilution and lower toughness than manual GTAW. | 405 | 640 | 36 | 190 HB | 1.5 % IACS |
AWDefault As-welded deposit | Default condition: GTAW deposit used as-welded for Alloy 690 and dissimilar-metal nuclear joints. | 415 | 655 | 40 | 185 HB | 1.5 % IACS |
What is ERNiCrFe-7 PWHT?
ERNiCrFe-7 PWHT is ERNiCrFe-7 heat treated to PWHT — use when the joint contains low-alloy ferritic steel requiring code-mandated stress relief; slight strength drop, toughness retained. ERNiCrFe-7 PWHT has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 630 MPa (91.4 ksi) — stronger than 51% of nickel alloy grades. Elongation at break is 42% and the elastic modulus is 207 GPa (30 Msi). ERNiCrFe-7 PWHT has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 52% of nickel alloy grades. It melts at 1,360°C (2,480 °F). AW is the default condition FabDigit quotes; PWHT is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 210 MPa·√m (191.1 ksi·√in), better than 101% of nickel alloy grades
- Good corrosion resistance — 88/100, better than 81% of nickel alloy grades
ERNiCrFe-7 PWHT properties
Typical room-temperature values for ERNiCrFe-7 PWHT; 22 are specific to this condition. Other listed values are ERNiCrFe-7 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
ERNiCrFe-7 PWHT has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 52% of nickel alloy grades. It melts at 1,360°C (2,480 °F).
Mechanical16
ERNiCrFe-7 PWHT has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 630 MPa (91.4 ksi) — stronger than 51% of nickel alloy grades. Elongation at break is 42% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
ERNiCrFe-7 PWHT is rated for continuous service to 950°C (1,742 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), better than 65% of nickel alloy grades. Thermal expansion is 13.9 µm/m·K (7.72 µin/in·°F).
Electrical3
ERNiCrFe-7 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-7 PWHT takes about 155 MJ of energy and emits 13 kg of CO₂ — less than 58% of nickel alloy grades. Typical recycled content is 25%.
Manufacturability7
ERNiCrFe-7 PWHT's machinability is poor (24/100, better than 71% of nickel alloy grades); weldability very good (78/100); formability good (62/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERNiCrFe-7 PWHT
Is ERNiCrFe-7 easy to machine?
Deposits machine like Alloy 690 — low speed, heavy positive-rake carbide, rigid setup and flood coolant to fight work hardening.
Can ERNiCrFe-7 be welded?
GTAW/hot-wire GTAW preferred with low heat input, interpass ≤150 °C, stringer beads and clean interpass grinding to avoid lack of fusion and ductility-dip cracking.
Can ERNiCrFe-7 be formed, bent or molded?
Supplied as drawn wire; no user forming beyond straightening — keep wire clean and free of oil, moisture and copper contamination.
What surface finishes work on ERNiCrFe-7?
Pickle or mechanically clean the Cr-rich oxide before subsequent passes; electropolish or passivate for nuclear surface-cleanliness requirements; not anodizable.
ERNiCrFe-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 | 28 – 31.5 | 29.5 |
| Fe | 7 – 11 | 9 |
| C | ≤ 0.04 | 0.03 |
| Mn | ≤ 1 | 0.25 |
| Si | ≤ 0.5 | 0.15 |
| Ti | ≤ 1 | 0.5 |
| Al | ≤ 1.1 | 0.7 |
| Nb+Ta | ≤ 0.1 | 0.02 |
| Mo | ≤ 0.5 | 0.05 |
| Cu | ≤ 0.3 | 0.02 |
| Colow-cobalt requirement for nuclear service | ≤ 0.1 | 0.02 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0 |
| Other elements, total | ≤ 0.5 | — |
| Niplus incidental Co, remainder | ≥ 54 (balance) | — |
ERNiCrFe-7 PWHT — frequently asked
What is ERNiCrFe-7 PWHT used for?
ERNiCrFe-7 PWHT is typically used for nuclear reactor dissimilar metal welds, alloy 690 tube-to-tubesheet welding and steam generator repairs. In short: nuclear dissimilar-metal standard; highest service temperature, 950 °C; high-Cr SCC resistance.
What is the yield strength of ERNiCrFe-7 PWHT?
ERNiCrFe-7 PWHT has a typical yield strength of 390 MPa (56.6 ksi) and a tensile strength of 630 MPa (91.4 ksi) — stronger than 51% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is ERNiCrFe-7 PWHT easy to machine?
Not especially — machinability is rated poor (24/100, better than 71% of nickel alloy grades). Deposits machine like Alloy 690 — low speed, heavy positive-rake carbide, rigid setup and flood coolant to fight work hardening.
Can ERNiCrFe-7 PWHT be welded?
Yes — weldability is rated very good (78/100). GTAW/hot-wire GTAW preferred with low heat input, interpass ≤150 °C, stringer beads and clean interpass grinding to avoid lack of fusion and ductility-dip cracking.
What surface finishes work on ERNiCrFe-7 PWHT?
Pickle or mechanically clean the Cr-rich oxide before subsequent passes; electropolish or passivate for nuclear surface-cleanliness requirements; not anodizable.
Can ERNiCrFe-7 PWHT be formed, bent or molded?
Supplied as drawn wire; no user forming beyond straightening — keep wire clean and free of oil, moisture and copper contamination.
What is the maximum service temperature of ERNiCrFe-7 PWHT?
ERNiCrFe-7 PWHT is rated for continuous use to about 950°C (1,742 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ERNiCrFe-7-AW and ERNiCrFe-7 PWHT?
AW is the default condition — default condition: GTAW deposit used as-welded for Alloy 690 and dissimilar-metal nuclear joints. PWHT: use when the joint contains low-alloy ferritic steel requiring code-mandated stress relief; slight strength drop, toughness retained. Yield strength is 415 MPa in AW versus 390 MPa in PWHT.
Sources
- AWS A5.14/A5.14M — Nickel and Nickel-Alloy Bare Welding Electrodes and Rods — American Welding Society (2018)
- ASME SFA-5.14 (Section II Part C) — ASME (2023)
- INCONEL Filler Metal 52 / Alloy 690 product data — Special Metals Corporation (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (Ni-alloy weldability) — ASM International (1993)
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.