Stainless Steel ER410NiMo PWHT-DT
Heat-treated state
UNS S41086
PWHT-DT = double temper (≈670 °C + ≈600 °C) for maximum toughness
Choose for hydro-turbine runner and pump-casing repairs requiring low-temperature CVN toughness; the second temper conditions the reformed austenite and gives the highest impact energy at moderate strength.
Values for the PWHT-DT condition
Other ER410NiMo tempers and conditions
ER410NiMo is listed in 4 conditions; see the grade overview at ER410NiMo.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWHT-DTThis page Double temper (≈670 °C + ≈600 °C) for maximum toughness | Choose for hydro-turbine runner and pump-casing repairs requiring low-temperature CVN toughness; the second temper conditions the reformed austenite and gives the highest impact energy at moderate strength. | 660 | 820 | 22 | 26 HRC | — |
Normalized and tempered | Used when a repaired CA6NM/ZG04Cr13Ni4Mo casting receives the complete production heat treatment, giving weld metal properties matched to the base casting. | 680 | 830 | 20 | 27 HRC | 3 % IACS |
post-weld tempered 565–620 °C (single temper) | Standard AWS A5.9 qualification condition — tempered once at ~595 °C to soften the martensite and meet 760 MPa min tensile with good ductility. | 740 | 880 | 19 | 30 HRC | — |
AWDefault As-welded deposit | Default deposit condition straight from the arc — highest strength and hardness, lowest toughness; acceptable for build-up layers that will be machined or later tempered. | 830 | 950 | 14 | 38 HRC | — |
What is ER410NiMo PWHT-DT?
ER410NiMo PWHT-DT is ER410NiMo heat treated to PWHT-DT — choose for hydro-turbine runner and pump-casing repairs requiring low-temperature CVN toughness; the second temper conditions the reformed austenite and gives the highest impact energy at moderate strength. ER410NiMo PWHT-DT has a yield strength of 660 MPa (95.7 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 91% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi). ER410NiMo PWHT-DT has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,440°C (2,624 °F). AW is the default condition FabDigit quotes; PWHT-DT is available on request or by drawing note.
Advantages
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades
- High strength — 660 MPa (95.7 ksi), better than 91% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
Limitations
- Needs corrosion protection — 48/100, worse than 80% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
ER410NiMo PWHT-DT properties
Typical room-temperature values for ER410NiMo PWHT-DT; 15 are specific to this condition. Other listed values are ER410NiMo reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
ER410NiMo PWHT-DT has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,440°C (2,624 °F).
Mechanical15
ER410NiMo PWHT-DT has a yield strength of 660 MPa (95.7 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 91% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
ER410NiMo PWHT-DT is rated for continuous service to 450°C (842 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
ER410NiMo PWHT-DT conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (48/100), worse than 80% of stainless steel grades.
Sustainability4
Producing a kilogram of ER410NiMo PWHT-DT takes about 55 MJ of energy and emits 4.5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
ER410NiMo PWHT-DT's machinability is fair (40/100, better than 72% of stainless steel grades); weldability good (65/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ER410NiMo PWHT-DT
Is ER410NiMo easy to machine?
Machine after tempering — as-welded 38 HRC martensite work-hardens and abrades tooling; use rigid setups, coated carbide, low speed/heavy feed and finish-grind sealing surfaces.
Can ER410NiMo be welded?
Preheat/interpass typically 100–160 °C with low-hydrogen shielding (Ar or Ar+2% CO2 for GMAW), keep heat input moderate, cool below Mf (~100 °C) before tempering at 565–620 °C; avoid holding in the 400–500 °C embrittlement range.
Can ER410NiMo be formed, bent or molded?
Supplied only as drawn/spooled wire or cut rod; deposits are shaped by weld build-up and subsequent machining rather than cold forming.
What surface finishes work on ER410NiMo?
Passivate or pickle after grinding to restore the Cr oxide film; takes a good mechanical or electropolished finish, and is readily hard-chrome plated or painted for cavitation-resistant hydro surfaces.
ER410NiMo 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 |
|---|---|---|
| Clow carbon keeps martensite soft and weldable | ≤ 0.06 | 0.03 |
| Cr | 11 – 12.5 | 11.8 |
| Nitoughness + reformed austenite | 4 – 5 | 4.5 |
| Mo | 0.4 – 0.7 | 0.55 |
| Mn | ≤ 0.6 | 0.5 |
| Si | ≤ 0.5 | 0.4 |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Cu | ≤ 0.75 | — |
| other, totalsum of unspecified elements per AWS A5.9 | ≤ 0.5 | — |
| Fe | balance | — |
ER410NiMo PWHT-DT — frequently asked
What is ER410NiMo PWHT-DT used for?
ER410NiMo PWHT-DT is typically used for hydro turbine runner repair, CA6NM castings welding and pump impeller repair. In short: tougher than plain ER410; standard CA6NM repair wire; cavitation-resistant weld metal.
What is the yield strength of ER410NiMo PWHT-DT?
ER410NiMo PWHT-DT has a typical yield strength of 660 MPa (95.7 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 91% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is ER410NiMo PWHT-DT easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% of stainless steel grades). Machine after tempering — as-welded 38 HRC martensite work-hardens and abrades tooling; use rigid setups, coated carbide, low speed/heavy feed and finish-grind sealing surfaces.
Can ER410NiMo PWHT-DT be welded?
Yes — weldability is rated good (65/100). Preheat/interpass typically 100–160 °C with low-hydrogen shielding (Ar or Ar+2% CO2 for GMAW), keep heat input moderate, cool below Mf (~100 °C) before tempering at 565–620 °C; avoid holding in the 400–500 °C embrittlement range.
What surface finishes work on ER410NiMo PWHT-DT?
Passivate or pickle after grinding to restore the Cr oxide film; takes a good mechanical or electropolished finish, and is readily hard-chrome plated or painted for cavitation-resistant hydro surfaces.
Can ER410NiMo PWHT-DT be formed, bent or molded?
Supplied only as drawn/spooled wire or cut rod; deposits are shaped by weld build-up and subsequent machining rather than cold forming.
What is the maximum service temperature of ER410NiMo PWHT-DT?
ER410NiMo PWHT-DT is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER410NiMo-AW and ER410NiMo PWHT-DT?
AW is the default condition — default deposit condition straight from the arc — highest strength and hardness, lowest toughness; acceptable for build-up layers that will be machined or later tempered. PWHT-DT: choose for hydro-turbine runner and pump-casing repairs requiring low-temperature CVN toughness; the second temper conditions the reformed austenite and gives the highest impact energy at moderate strength. Yield strength is 830 MPa in AW versus 660 MPa in PWHT-DT.
Sources
- AWS A5.9/A5.9M — Bare Stainless Steel Welding Electrodes and Rods (ER410NiMo, UNS S41086) — AWS (2017)
- ASTM A743/A743M & A487 — CA6NM castings (base metal matched by this filler) — ASTM (2019)
- GB/T 29713 / GB/T 17854 — SAC (2013)
- ASM Handbook Vol.6 Welding, Brazing and Soldering; Vol.1 Properties of Steels — ASM International (1993)
- Soft-martensitic 13Cr-4Ni-Mo solid wire datasheets (Böhler CN 13/4-IG class, Lincoln/ESAB equivalents) — voestalpine Böhler Welding / ESAB (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.