Steel ER80S-Ni3 PWHT
Heat-treated state
UNS K31240
PWHT = post-weld heat treated
Pick when the code requires post-weld stress relief of thick low-temperature pressure parts; strength drops slightly, low-temperature toughness and ductility improve.
Values for the PWHT condition
Other ER80S-Ni3 tempers and conditions
ER80S-Ni3 is listed in 2 conditions; see the grade overview at ER80S-Ni3.
- PWHT
- AW
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWHTThis page Post-weld heat treated | Pick when the code requires post-weld stress relief of thick low-temperature pressure parts; strength drops slightly, low-temperature toughness and ductility improve. | 480 | 570 | 29 | 175 HB | 7.4 % IACS |
AWDefault As-welded deposit | Default condition for classification testing and most fabrication: deposit used directly without post-weld heat treatment. | 510 | 600 | 26 | 190 HB | — |
What is ER80S-Ni3 PWHT?
ER80S-Ni3 PWHT is ER80S-Ni3 heat treated to PWHT — pick when the code requires post-weld stress relief of thick low-temperature pressure parts; strength drops slightly, low-temperature toughness and ductility improve. ER80S-Ni3 PWHT has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 59% of steel grades. Elongation at break is 29% and the elastic modulus is 205 GPa (29.7 Msi). ER80S-Ni3 PWHT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F). AW is the default condition FabDigit quotes; PWHT is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 150 MPa·√m (136.5 ksi·√in), better than 96% of steel grades
- Ductile — tolerates forming and impact — 29%, better than 91% of steel grades
- Readily welded — 88/100, better than 87% of steel grades
ER80S-Ni3 PWHT properties
Typical room-temperature values for ER80S-Ni3 PWHT; 23 are specific to this condition. Other listed values are ER80S-Ni3 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
ER80S-Ni3 PWHT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical14
ER80S-Ni3 PWHT has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 59% of steel grades. Elongation at break is 29% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
ER80S-Ni3 PWHT is rated for continuous service to 350°C (662 °F). It conducts heat at 39 W/m·K (22.5 BTU/hr·ft·°F), worse than 67% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
ER80S-Ni3 PWHT conducts electricity at 7.4 % IACS, worse than 70% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of ER80S-Ni3 PWHT takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability7
ER80S-Ni3 PWHT's machinability is good (56/100, better than 71% of steel grades); weldability excellent (88/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ER80S-Ni3 PWHT
Is ER80S-Ni3 easy to machine?
Weld deposit machines like a normalized 550 MPa low-alloy steel — carbide tooling, moderate speeds; slag/spatter removal first to protect edges.
Can ER80S-Ni3 be welded?
GMAW with Ar + 2–20 % CO₂ (low CO₂ preferred for toughness) or GTAW with pure Ar; keep heat input ≤ ~2.0 kJ/mm and interpass ≤ 150 °C to retain -73 °C impact values, preheat per base-metal thickness.
Can ER80S-Ni3 be formed, bent or molded?
Supplied only as drawn wire/rod; joints in Ni-steel plate should be cold-formed before welding, and the deposit itself has adequate ductility for post-weld straightening.
What surface finishes work on ER80S-Ni3?
Not corrosion resistant — clean, then paint, metallize or galvanize; do not anodize; avoid copper-coated wire in nuclear/cryo applications that restrict Cu pickup.
ER80S-Ni3 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 |
|---|---|---|
| CAWS A5.28 max | ≤ 0.12 | 0.07 |
| Mn | ≤ 1.25 | 1.05 |
| Si | 0.4 – 0.8 | 0.55 |
| Nikey element for low-temperature toughness | 3 – 3.75 | 3.35 |
| Cr | ≤ 0.15 | 0.03 |
| Mo | ≤ 0.35 | 0.02 |
| V | ≤ 0.05 | 0.01 |
| Cuincluding copper coating | ≤ 0.35 | 0.2 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| other (total)total of all other elements per AWS A5.28 | ≤ 0.5 | — |
| Fe | balance | — |
ER80S-Ni3 PWHT — frequently asked
What is ER80S-Ni3 PWHT used for?
ER80S-Ni3 PWHT is typically used for cryogenic vessel welding, LNG storage tank welding and arctic/offshore low-temperature steel structures. In short: highest toughness Ni-series wire; 3.25 % Ni cryogenic filler; lowest service temperature ceiling.
What is the yield strength of ER80S-Ni3 PWHT?
ER80S-Ni3 PWHT has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 2 listed tempers.
Is ER80S-Ni3 PWHT easy to machine?
Reasonably — machinability is rated good (56/100, better than 71% of steel grades). Weld deposit machines like a normalized 550 MPa low-alloy steel — carbide tooling, moderate speeds; slag/spatter removal first to protect edges.
Can ER80S-Ni3 PWHT be welded?
Yes — weldability is rated excellent (88/100). GMAW with Ar + 2–20 % CO₂ (low CO₂ preferred for toughness) or GTAW with pure Ar; keep heat input ≤ ~2.0 kJ/mm and interpass ≤ 150 °C to retain -73 °C impact values, preheat per base-metal thickness.
What surface finishes work on ER80S-Ni3 PWHT?
Not corrosion resistant — clean, then paint, metallize or galvanize; do not anodize; avoid copper-coated wire in nuclear/cryo applications that restrict Cu pickup.
Can ER80S-Ni3 PWHT be formed, bent or molded?
Supplied only as drawn wire/rod; joints in Ni-steel plate should be cold-formed before welding, and the deposit itself has adequate ductility for post-weld straightening.
What is the maximum service temperature of ER80S-Ni3 PWHT?
ER80S-Ni3 PWHT is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER80S-Ni3-AW and ER80S-Ni3 PWHT?
AW is the default condition — default condition for classification testing and most fabrication: deposit used directly without post-weld heat treatment. PWHT: pick when the code requires post-weld stress relief of thick low-temperature pressure parts; strength drops slightly, low-temperature toughness and ductility improve. Yield strength is 510 MPa in AW versus 480 MPa in PWHT.
Sources
- AWS A5.28/A5.28M — Low-Alloy Steel Electrodes and Rods for Gas Shielded Arc Welding — American Welding Society (2020)
- ASME BPVC Section II Part C — SFA-5.28 — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- Solid wire ER80S-Ni3 all-weld-metal data (Lincoln Electric / ESAB / Böhler typical values) — various filler-metal producers (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.