Steel ER80S-Ni1 PWHT
Heat-treated state
UNS K11260
PWHT = post-weld heat treated
Use for pressure vessels and thick sections requiring code stress relief; strength drops slightly while ductility and toughness improve.
Values for the PWHT condition
Other ER80S-Ni1 tempers and conditions
ER80S-Ni1 is listed in 3 conditions; see the grade overview at ER80S-Ni1.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWHTThis page Post-weld heat treated | Use for pressure vessels and thick sections requiring code stress relief; strength drops slightly while ductility and toughness improve. | 480 | 570 | 29 | 170 HB | — |
As Welded, TIG deposit | Choose for root passes and thin-wall pipe where the cleaner, lower-oxygen TIG deposit gives the best sub-zero toughness. | 505 | 600 | 29 | 180 HB | 7.8 % IACS |
AWDefault As-welded deposit | Standard as-deposited condition for MAG welding of 490–550 MPa low-alloy steel with low-temperature toughness requirements. | 520 | 610 | 27 | 190 HB | — |
What is ER80S-Ni1 PWHT?
ER80S-Ni1 PWHT is ER80S-Ni1 heat treated to PWHT — use for pressure vessels and thick sections requiring code stress relief; strength drops slightly while ductility and toughness improve. ER80S-Ni1 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-Ni1 PWHT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F). AW is the default condition FabDigit quotes; PWHT is available on request or by drawing note.
Advantages
- Readily welded — 92/100, better than 93% of steel grades
- Ductile — tolerates forming and impact — 29%, better than 91% of steel grades
ER80S-Ni1 PWHT properties
Typical room-temperature values for ER80S-Ni1 PWHT; 12 are specific to this condition. Other listed values are ER80S-Ni1 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
ER80S-Ni1 PWHT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical15
ER80S-Ni1 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-Ni1 PWHT is rated for continuous service to 425°C (797 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
ER80S-Ni1 PWHT conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (14/100), better than 70% of steel grades.
Sustainability4
Producing a kilogram of ER80S-Ni1 PWHT takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 30%.
Manufacturability7
ER80S-Ni1 PWHT's machinability is good (60/100, better than 83% of steel grades); weldability excellent (92/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ER80S-Ni1 PWHT
Is ER80S-Ni1 easy to machine?
Deposits machine like normalised low-alloy steel; use sharp carbide, expect work hardening at bead crowns and dress out slag/oxide before finish cuts.
Can ER80S-Ni1 be welded?
Designed as filler: MAG with Ar+15–25 % CO₂ (or 100 % Ar for TIG); keep heat input ~1.0–2.5 kJ/mm, preheat 100–150 °C on thick or restrained joints and limit interpass to ~250 °C to protect low-temperature toughness.
Can ER80S-Ni1 be formed, bent or molded?
Supplied as copper-coated drawn wire on layer-wound spools; maintain smooth liner and correct drive-roll pressure to avoid coating flake and feed problems.
What surface finishes work on ER80S-Ni1?
Not anodisable — grind/blast to remove silicate islands and mill scale, then paint, metallise or zinc-coat; weld metal rusts at nearly the same rate as the parent carbon steel.
ER80S-Ni1 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 | 0.08 |
| Mn | ≤ 1.25 | 1.1 |
| Si | 0.4 – 0.8 | 0.6 |
| Nitoughness enhancer | 0.8 – 1.1 | 0.95 |
| Cr | ≤ 0.15 | 0.05 |
| Mo | ≤ 0.35 | 0.05 |
| V | ≤ 0.05 | 0.01 |
| Cuincluding copper coating | ≤ 0.35 | 0.2 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance | — |
ER80S-Ni1 PWHT — frequently asked
What is ER80S-Ni1 PWHT used for?
ER80S-Ni1 PWHT is typically used for low temperature service steel welding, pressure vessel fabrication and offshore structural steel. In short: 1 % Ni for cold-service toughness; ductile 27 % elongation deposit; entry point of the Ni-series wires.
What is the yield strength of ER80S-Ni1 PWHT?
ER80S-Ni1 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 3 listed tempers.
Is ER80S-Ni1 PWHT easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Deposits machine like normalised low-alloy steel; use sharp carbide, expect work hardening at bead crowns and dress out slag/oxide before finish cuts.
Can ER80S-Ni1 PWHT be welded?
Yes — weldability is rated excellent (92/100). Designed as filler: MAG with Ar+15–25 % CO₂ (or 100 % Ar for TIG); keep heat input ~1.0–2.5 kJ/mm, preheat 100–150 °C on thick or restrained joints and limit interpass to ~250 °C to protect low-temperature toughness.
What surface finishes work on ER80S-Ni1 PWHT?
Not anodisable — grind/blast to remove silicate islands and mill scale, then paint, metallise or zinc-coat; weld metal rusts at nearly the same rate as the parent carbon steel.
Can ER80S-Ni1 PWHT be formed, bent or molded?
Supplied as copper-coated drawn wire on layer-wound spools; maintain smooth liner and correct drive-roll pressure to avoid coating flake and feed problems.
What is the maximum service temperature of ER80S-Ni1 PWHT?
ER80S-Ni1 PWHT is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER80S-Ni1-AW and ER80S-Ni1 PWHT?
AW is the default condition — standard as-deposited condition for MAG welding of 490–550 MPa low-alloy steel with low-temperature toughness requirements. PWHT: use for pressure vessels and thick sections requiring code stress relief; strength drops slightly while ductility and toughness improve. Yield strength is 520 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)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Solid wire ER80S-Ni1 / SG Ni1 datasheets (Lincoln Electric, ESAB, Böhler Welding, / ) — various welding consumable 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.