Nickel Alloy ERNiFeCr-2-STA (Solution treated and aged)
Heat-treated state
also Inconel Filler Metal 52M, Filler Metal 718
Standard aerospace PWHT (AMS 5662/5663-type) when the weld must match aged Alloy 718 base metal strength.
Values for the STA condition
Other ERNiFeCr-2 tempers and conditions
ERNiFeCr-2 is listed in 5 conditions; see the grade overview at ERNiFeCr-2.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed weld metal | Pick when the joint must be homogenised (Laves dissolution) and kept soft/ductile for later forming, re-welding or corrosion service rather than for strength. | 450 | 850 | 35 | 210 HB | 1.4 % IACS |
AWDefault As-welded deposit | Default condition for procedure qualification and repairs where no post-weld heat treatment is possible; moderate strength, best ductility and toughness. | 550 | 830 | 25 | 24 HRC | — |
Direct aged | Use when a solution treatment would coarsen or distort the assembly: gives most of the strength of a full STA cycle straight from the as-welded condition. | 950 | 1,170 | 15 | 40 HRC | — |
High-temperature solution 1065 °C + double age | Choose for creep/rupture-dominated or heavy-section service where coarser grain and better stress-rupture life matter more than room-temperature strength. | 960 | 1,180 | 15 | 39 HRC | 1.4 % IACS |
STAThis page Solution treated and aged | Standard aerospace PWHT (AMS 5662/5663-type) when the weld must match aged Alloy 718 base metal strength. | 1,030 | 1,240 | 12 | 42 HRC | — |
What is ERNiFeCr-2-STA?
ERNiFeCr-2-STA is ERNiFeCr-2 heat treated to STA — standard aerospace PWHT (AMS 5662/5663-type) when the weld must match aged Alloy 718 base metal strength. ERNiFeCr-2-STA has a yield strength of 1,030 MPa (149 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 96% of nickel alloy grades. Elongation at break is 12% and the elastic modulus is 204 GPa (29.6 Msi). ERNiFeCr-2-STA has a density of 8.19 g/cm³ (0.296 lb/in³), lighter than 68% of nickel alloy grades. It melts at 1,260°C (2,300 °F). AW is the default condition FabDigit quotes; STA is available on request or by drawing note.
Advantages
- High strength — 1,030 MPa (149 ksi), better than 96% of nickel alloy grades
Limitations
- Limited ductility — 12%, worse than 83% of nickel alloy grades
ERNiFeCr-2-STA properties
Typical room-temperature values for ERNiFeCr-2-STA; 14 are specific to this condition. Other listed values are ERNiFeCr-2 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
ERNiFeCr-2-STA has a density of 8.19 g/cm³ (0.296 lb/in³), lighter than 68% of nickel alloy grades. It melts at 1,260°C (2,300 °F).
Mechanical14
ERNiFeCr-2-STA has a yield strength of 1,030 MPa (149 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 96% of nickel alloy grades. Elongation at break is 12% and the elastic modulus is 204 GPa (29.6 Msi).
Thermal6
ERNiFeCr-2-STA is rated for continuous service to 650°C (1,202 °F). It conducts heat at 11.4 W/m·K (6.59 BTU/hr·ft·°F), better than 53% of nickel alloy grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
ERNiFeCr-2-STA conducts electricity at 1.4 % IACS, worse than 78% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), worse than 71% of nickel alloy grades.
Sustainability4
Producing a kilogram of ERNiFeCr-2-STA takes about 165 MJ of energy and emits 12 kg of CO₂ — more than 54% of nickel alloy grades. Typical recycled content is 30%.
Manufacturability7
ERNiFeCr-2-STA's machinability is poor (20/100, better than 53% of nickel alloy grades); weldability good (60/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERNiFeCr-2-STA
Is ERNiFeCr-2 easy to machine?
Aged weld metal machines like Alloy 718 — low speed, heavy positive-rake carbide or ceramic tooling, rigid setups and flood coolant; work hardens fast, so avoid dwelling.
Can ERNiFeCr-2 be welded?
Use GTAW/GMAW with argon (or Ar-He) shielding, low heat input and interpass ≤150 °C to limit Laves segregation; keep restraint low and consider a homogenising solution treatment before ageing to avoid strain-age/liquation cracking.
Can ERNiFeCr-2 be formed, bent or molded?
Supplied as drawn wire or cut rod; heavy cold forming of the deposit is impractical because of high work-hardening rate and low as-aged ductility.
What surface finishes work on ERNiFeCr-2?
Grind or pickle to remove weld oxide before ageing; not anodizable — passivation, electropolishing or Ni/Cr plating for surface protection.
ERNiFeCr-2 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 |
|---|---|---|
| C | ≤ 0.08 | 0.04 |
| Mn | ≤ 0.35 | 0.1 |
| Si | ≤ 0.35 | 0.1 |
| P | ≤ 0.02 | — |
| S | ≤ 0.02 | — |
| NiNi+Co | 50 – 55 | 53 |
| Cr | 17 – 21 | 19 |
| Mo | 2.8 – 3.3 | 3 |
| NbNb+Ta | 4.75 – 5.5 | 5.1 |
| Ti | 0.65 – 1.15 | 0.9 |
| Al | 0.2 – 0.8 | 0.5 |
| Co | ≤ 1 | — |
| Cu | ≤ 0.3 | — |
| B | ≤ 0.01 | 0 |
| Others (total) | ≤ 0.5 | — |
| Febalance, typically 17–20 % | balance | — |
ERNiFeCr-2-STA — frequently asked
What is ERNiFeCr-2-STA used for?
ERNiFeCr-2-STA is typically used for nuclear reactor pressure vessel penetrations, alloy 690 dissimilar metal welds and steam generator nozzle welds. In short: ductility-dip resistant filler; nuclear dissimilar-weld grade; age-hardenable weld metal.
What is the yield strength of ERNiFeCr-2-STA?
ERNiFeCr-2-STA has a typical yield strength of 1,030 MPa (149 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 96% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is ERNiFeCr-2-STA easy to machine?
Not especially — machinability is rated poor (20/100, better than 53% of nickel alloy grades). Aged weld metal machines like Alloy 718 — low speed, heavy positive-rake carbide or ceramic tooling, rigid setups and flood coolant; work hardens fast, so avoid dwelling.
Can ERNiFeCr-2-STA be welded?
Yes — weldability is rated good (60/100). Use GTAW/GMAW with argon (or Ar-He) shielding, low heat input and interpass ≤150 °C to limit Laves segregation; keep restraint low and consider a homogenising solution treatment before ageing to avoid strain-age/liquation cracking.
What surface finishes work on ERNiFeCr-2-STA?
Grind or pickle to remove weld oxide before ageing; not anodizable — passivation, electropolishing or Ni/Cr plating for surface protection.
Can ERNiFeCr-2-STA be formed, bent or molded?
Supplied as drawn wire or cut rod; heavy cold forming of the deposit is impractical because of high work-hardening rate and low as-aged ductility.
What is the maximum service temperature of ERNiFeCr-2-STA?
ERNiFeCr-2-STA 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 ERNiFeCr-2-AW and ERNiFeCr-2-STA?
AW is the default condition — default condition for procedure qualification and repairs where no post-weld heat treatment is possible; moderate strength, best ductility and toughness. STA: standard aerospace PWHT (AMS 5662/5663-type) when the weld must match aged Alloy 718 base metal strength. Yield strength is 550 MPa in AW versus 1,030 MPa in STA.
Sources
- AWS A5.14/A5.14M — Nickel and Nickel-Alloy Bare Welding Electrodes and Rods (ERNiFeCr-2, UNS N07718) — American Welding Society (2018)
- AMS 5832 — Nickel Alloy Welding Wire 52.5Ni-19Cr-3.0Mo-5.1Cb-0.90Ti-0.50Al-18Fe — SAE International (2021)
- INCONEL alloy 718 / INCONEL Filler Metal 718 technical bulletin — Special Metals Corporation (2007)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Alloy 718) — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (welding of precipitation-hardened Ni alloys) — ASM International (1993)
- MMPDS — Metallic Materials Properties Development and Standardization, alloy 718 chapter — Battelle/FAA (2023)
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.