Stainless Steel E410NiMo PWHT-DT
Heat-treated state
UNS W41016
PWHT-DT = double temper
Hydro-turbine practice: first temper forms reverted austenite, second temper conditions any fresh martensite — maximum toughness and lowest hardness for runner repairs.
Values for the PWHT-DT condition
Other E410NiMo tempers and conditions
E410NiMo is listed in 6 conditions; see the grade overview at E410NiMo.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWHT-DTThis page Double temper | Hydro-turbine practice: first temper forms reverted austenite, second temper conditions any fresh martensite — maximum toughness and lowest hardness for runner repairs. | 640 | 780 | 20 | 23 HRC | — |
PWHT 595 °C | Standard post-weld temper used for AWS classification testing and for most CA6NM repairs — balances strength with much better toughness and lower hardness. | 700 | 830 | 18 | 26 HRC | — |
Rutile-silica coating, AC or DCEP | Silica-modified rutile coating with the smoothest bead appearance and best out-of-position handling; slightly higher silicon in the deposit. | 750 | 890 | 14 | 34 HRC | 2.2 % IACS |
AWDefault As-welded deposit | Condition of the deposit straight off the arc — highest hardness/strength, lowest toughness; use when no PWHT is possible and service loads are moderate. | 760 | 900 | 15 | 34 HRC | — |
Rutile/titania-basic coating, AC or DCEP | Most widely stocked coating type (also the GB/T 983 E410NiMo-16 designation) — smooth arc, easy slag release, AC-capable for field repair. | 760 | 900 | 15 | 34 HRC | 2.2 % IACS |
Lime/basic coating, DCEP only | Basic-coated version: lowest diffusible hydrogen and best deposit toughness — first choice for thick-section CA6NM repair where cracking risk is high. | 770 | 910 | 16 | 33 HRC | 2.2 % IACS |
What is E410NiMo PWHT-DT?
E410NiMo PWHT-DT is E410NiMo heat treated to PWHT-DT — hydro-turbine practice: first temper forms reverted austenite, second temper conditions any fresh martensite — maximum toughness and lowest hardness for runner repairs. E410NiMo PWHT-DT has a yield strength of 640 MPa (92.8 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 90% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi). E410NiMo PWHT-DT has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,400°C (2,552 °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 — 640 MPa (92.8 ksi), better than 90% of stainless steel grades
- Easy to machine — 48/100, better than 88% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Limited ductility — 20%, worse than 79% of stainless steel grades
- Needs corrosion protection — 50/100, worse than 78% of stainless steel grades
E410NiMo PWHT-DT properties
Typical room-temperature values for E410NiMo PWHT-DT; 14 are specific to this condition. Other listed values are E410NiMo reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
E410NiMo PWHT-DT has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical15
E410NiMo PWHT-DT has a yield strength of 640 MPa (92.8 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 90% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
E410NiMo PWHT-DT is rated for continuous service to 500°C (932 °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 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
E410NiMo PWHT-DT conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 78% of stainless steel grades.
Sustainability4
Producing a kilogram of E410NiMo PWHT-DT takes about 48 MJ of energy and emits 3.6 kg of CO₂ — less than 85% of stainless steel grades. Typical recycled content is 55%.
Manufacturability5
E410NiMo PWHT-DT's machinability is fair (48/100, better than 88% of stainless steel grades); weldability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E410NiMo PWHT-DT
Is E410NiMo easy to machine?
Machine after tempering (≤26 HRC); as-welded deposit at 34+ HRC needs carbide tooling, low speed and rigid setup — finish grinding is usually preferred for turbine blade profiles.
Can E410NiMo be welded?
Preheat/interpass 100–160 °C, keep interpass below ~150 °C to allow martensite transformation, cool to ~100 °C before the 595–620 °C temper; redry electrodes (250–300 °C) and never temper above Ac1 (~630 °C).
Can E410NiMo be formed, bent or molded?
Not applicable — consumable electrode; deposit shape is controlled by weave, bead sequence and buttering layers rather than forming.
What surface finishes work on E410NiMo?
Deposits blend-grind and polish well and can be shot-peened for cavitation service; passivate or leave bare — do not plate before tempering because of hydrogen embrittlement risk.
E410NiMo 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 soft martensite | ≤ 0.06 | 0.03 |
| Cr | 11 – 12.5 | 11.8 |
| Ni | 4 – 5 | 4.5 |
| Mo | 0.4 – 0.7 | 0.55 |
| Mn | ≤ 1 | 0.7 |
| Siupper end for -17 coating type | ≤ 0.9 | 0.4 |
| Cu | ≤ 0.75 | — |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Fe | balance | — |
E410NiMo PWHT-DT — frequently asked
What is E410NiMo PWHT-DT used for?
E410NiMo PWHT-DT is typically used for hydro turbine runner repair, CA6NM casting weld repair and pump and valve components. In short: CA6NM-matching deposit; cavitation-resistant overlay; requires post-weld temper.
What is the yield strength of E410NiMo PWHT-DT?
E410NiMo PWHT-DT has a typical yield strength of 640 MPa (92.8 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 90% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is E410NiMo PWHT-DT easy to machine?
Reasonably — machinability is rated fair (48/100, better than 88% of stainless steel grades). Machine after tempering (≤26 HRC); as-welded deposit at 34+ HRC needs carbide tooling, low speed and rigid setup — finish grinding is usually preferred for turbine blade profiles.
Can E410NiMo PWHT-DT be welded?
Yes — weldability is rated good (55/100). Preheat/interpass 100–160 °C, keep interpass below ~150 °C to allow martensite transformation, cool to ~100 °C before the 595–620 °C temper; redry electrodes (250–300 °C) and never temper above Ac1 (~630 °C).
What surface finishes work on E410NiMo PWHT-DT?
Deposits blend-grind and polish well and can be shot-peened for cavitation service; passivate or leave bare — do not plate before tempering because of hydrogen embrittlement risk.
Can E410NiMo PWHT-DT be formed, bent or molded?
Not applicable — consumable electrode; deposit shape is controlled by weave, bead sequence and buttering layers rather than forming.
What is the maximum service temperature of E410NiMo PWHT-DT?
E410NiMo PWHT-DT is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E410NiMo-AW and E410NiMo PWHT-DT?
AW is the default condition — condition of the deposit straight off the arc — highest hardness/strength, lowest toughness; use when no PWHT is possible and service loads are moderate. PWHT-DT: hydro-turbine practice: first temper forms reverted austenite, second temper conditions any fresh martensite — maximum toughness and lowest hardness for runner repairs. Yield strength is 760 MPa in AW versus 640 MPa in PWHT-DT.
Sources
- AWS A5.4/A5.4M Specification for Stainless Steel Electrodes for Shielded Metal Arc Welding — American Welding Society (2012)
- ASTM A743/A743M (CA6NM casting grade) — ASTM International (2019)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (martensitic stainless welding) — ASM International (1993)
- ASM Handbook Vol. 1 — Properties of Stainless Steels — ASM International (1990)
- 410NiMo covered electrode datasheets (Böhler, Lincoln, ESAB, / ) — various 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.