Nickel Alloy ERNiCrMo-3 PWHT-SR
Heat-treated state
UNS N06625 · ASTM A5.14 ERNiCrMo-3 · EN 2.4831 · ISO Ni 6625 · also Inconel Filler Metal 625, Filler Metal 625
PWHT-SR = stress relieved weld metal
Used when the base metal dictates a stress-relief cycle; mild strength drop, watch for carbide/δ-phase toughness loss on long holds.
Values for the PWHT-SR condition
Other ERNiCrMo-3 tempers and conditions
ERNiCrMo-3 is listed in 5 conditions; see the grade overview at ERNiCrMo-3.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
weld metal solution annealed ≈1100–1150 °C, water quenched | Choose when the fabrication is solution annealed after welding to homogenize Nb segregation and maximize ductility/corrosion resistance. | 400 | 760 | 50 | 180 HB | 1.4 % IACS |
AW | For thick-section joints and large-area cladding; flux choice controls Nb/Si pickup and hot-cracking risk. | 470 | 770 | 33 | 200 HB | 1.3 % IACS |
PWHT-SRThis page Stress relieved weld metal | Used when the base metal dictates a stress-relief cycle; mild strength drop, watch for carbide/δ-phase toughness loss on long holds. | 470 | 790 | 38 | 200 HB | 1.3 % IACS |
AW | Pick for high-deposition semi-automatic/robotic welding and overlay; slightly lower ductility than GTAW due to higher heat input. | 490 | 780 | 36 | 205 HB | 1.3 % IACS |
AWDefault As-welded deposit | Default condition: properties of the as-deposited GTAW weld metal, no post-weld heat treatment. | 500 | 800 | 40 | 210 HB | — |
What is ERNiCrMo-3 PWHT-SR?
ERNiCrMo-3 PWHT-SR is ERNiCrMo-3 heat treated to PWHT-SR — used when the base metal dictates a stress-relief cycle; mild strength drop, watch for carbide/δ-phase toughness loss on long holds. ERNiCrMo-3 PWHT-SR has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 68% of nickel alloy grades. Elongation at break is 38% and the elastic modulus is 205 GPa (29.7 Msi). ERNiCrMo-3 PWHT-SR has a density of 8.44 g/cm³ (0.305 lb/in³), heavier than 60% of nickel alloy grades. It melts at 1,290°C (2,354 °F). AW is the default condition FabDigit quotes; PWHT-SR is available on request or by drawing note.
Advantages
- Readily welded — 93/100, better than 99% of nickel alloy grades
- Good corrosion resistance — 90/100, better than 85% of nickel alloy grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 75% of nickel alloy grades
Limitations
- Poor heat conductor — 9.8 W/m·K (5.66 BTU/hr·ft·°F), worse than 92% of nickel alloy grades
ERNiCrMo-3 PWHT-SR properties
Typical room-temperature values for ERNiCrMo-3 PWHT-SR; 22 are specific to this condition. Other listed values are ERNiCrMo-3 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
ERNiCrMo-3 PWHT-SR has a density of 8.44 g/cm³ (0.305 lb/in³), heavier than 60% of nickel alloy grades. It melts at 1,290°C (2,354 °F).
Mechanical15
ERNiCrMo-3 PWHT-SR has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 68% of nickel alloy grades. Elongation at break is 38% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
ERNiCrMo-3 PWHT-SR is rated for continuous service to 900°C (1,652 °F). It conducts heat at 9.8 W/m·K (5.66 BTU/hr·ft·°F), worse than 92% of nickel alloy grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
ERNiCrMo-3 PWHT-SR conducts electricity at 1.3 % IACS, worse than 89% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (90/100), better than 85% of nickel alloy grades.
Sustainability4
Producing a kilogram of ERNiCrMo-3 PWHT-SR takes about 170 MJ of energy and emits 13 kg of CO₂ — more than 61% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability7
ERNiCrMo-3 PWHT-SR's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability excellent (93/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERNiCrMo-3 PWHT-SR
Is ERNiCrMo-3 easy to machine?
Weld deposit machines like alloy 625: low speed, heavy positive-rake carbide, rigid setup and flood coolant to beat severe work hardening and built-up edge.
Can ERNiCrMo-3 be welded?
GTAW/GMAW/PAW/SAW with Ar or Ar-He shielding, low interpass (<150 °C) and stringer beads; keep dilution and sulfur/phosphorus pickup low to avoid hot cracking, no preheat needed.
Can ERNiCrMo-3 be formed, bent or molded?
Consumable is cold drawn and layer-wound; deposits are ductile but strongly work hardening, so any cold straightening/forming of weldments needs generous bend radii.
What surface finishes work on ERNiCrMo-3?
Pickle or mechanically remove heat tint and remove residual Nb-rich films before service; electropolish or passivate for cleanliness — do not anodize.
ERNiCrMo-3 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 | 20 – 23 | 21.5 |
| Mo | 8 – 10 | 9 |
| NbNb + Ta | 3.15 – 4.15 | 3.6 |
| Fe | ≤ 5 | 2 |
| C | ≤ 0.1 | 0.03 |
| Mn | ≤ 0.5 | 0.2 |
| Si | ≤ 0.5 | 0.2 |
| Al | ≤ 0.4 | 0.15 |
| Ti | ≤ 0.4 | 0.15 |
| Cu | ≤ 0.5 | 0.05 |
| Cowhen specified | ≤ 0.12 | 0.05 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0 |
| Other, total | ≤ 0.5 | — |
| Niplus incidental Co | ≥ 58 (balance) | — |
ERNiCrMo-3 PWHT-SR — frequently asked
What is ERNiCrMo-3 PWHT-SR used for?
ERNiCrMo-3 PWHT-SR is typically used for pipe welding root passes, overlay cladding on carbon steel, subsea equipment welding and dissimilar metal joining. In short: most versatile nickel filler; service to 900 °C; standard CRA overlay wire.
What is the yield strength of ERNiCrMo-3 PWHT-SR?
ERNiCrMo-3 PWHT-SR has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 68% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is ERNiCrMo-3 PWHT-SR easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Weld deposit machines like alloy 625: low speed, heavy positive-rake carbide, rigid setup and flood coolant to beat severe work hardening and built-up edge.
Can ERNiCrMo-3 PWHT-SR be welded?
Yes — weldability is rated excellent (93/100). GTAW/GMAW/PAW/SAW with Ar or Ar-He shielding, low interpass (<150 °C) and stringer beads; keep dilution and sulfur/phosphorus pickup low to avoid hot cracking, no preheat needed.
What surface finishes work on ERNiCrMo-3 PWHT-SR?
Pickle or mechanically remove heat tint and remove residual Nb-rich films before service; electropolish or passivate for cleanliness — do not anodize.
Can ERNiCrMo-3 PWHT-SR be formed, bent or molded?
Consumable is cold drawn and layer-wound; deposits are ductile but strongly work hardening, so any cold straightening/forming of weldments needs generous bend radii.
What is the maximum service temperature of ERNiCrMo-3 PWHT-SR?
ERNiCrMo-3 PWHT-SR is rated for continuous use to about 900°C (1,652 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ERNiCrMo-3-AW and ERNiCrMo-3 PWHT-SA?
AW is the default condition — default condition: properties of the as-deposited GTAW weld metal, no post-weld heat treatment. PWHT-SA: choose when the fabrication is solution annealed after welding to homogenize Nb segregation and maximize ductility/corrosion resistance. Yield strength is 500 MPa in AW versus 400 MPa in PWHT-SA.
Sources
- AWS A5.14/A5.14M — Nickel and Nickel-Alloy Bare Welding Electrodes and Rods — AWS (2018)
- ASTM B443 / UNS N06625 chemistry basis — ASTM (2019)
- INCONEL Filler Metal 625 product datasheet — Special Metals Corporation (2020)
- ASM Handbook Vol.6 Welding, Brazing and Soldering; Vol.2 Nonferrous Alloys — 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.