Stainless Steel E410NiMo PWHT595
Heat-treated state
UNS W41016
PWHT595 = 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.
Values for the PWHT595 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 |
|---|---|---|---|---|---|---|
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 | — |
PWHT595This page 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 PWHT595?
E410NiMo PWHT595 is E410NiMo heat treated to PWHT595 — standard post-weld temper used for AWS classification testing and for most CA6NM repairs — balances strength with much better toughness and lower hardness. E410NiMo PWHT595 has a yield strength of 700 MPa (102 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 92% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi). E410NiMo PWHT595 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; PWHT595 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 — 700 MPa (102 ksi), better than 92% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Limited ductility — 18%, worse than 83% of stainless steel grades
- Needs corrosion protection — 48/100, worse than 80% of stainless steel grades
E410NiMo PWHT595 properties
Typical room-temperature values for E410NiMo PWHT595; 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 PWHT595 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 PWHT595 has a yield strength of 700 MPa (102 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 92% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
E410NiMo PWHT595 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 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
E410NiMo PWHT595 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (48/100), worse than 80% of stainless steel grades.
Sustainability4
Producing a kilogram of E410NiMo PWHT595 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 PWHT595's machinability is fair (42/100, better than 79% 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 PWHT595
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 PWHT595 — frequently asked
What is E410NiMo PWHT595 used for?
E410NiMo PWHT595 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 PWHT595?
E410NiMo PWHT595 has a typical yield strength of 700 MPa (102 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 92% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is E410NiMo PWHT595 easy to machine?
Not especially — machinability is rated fair (42/100, better than 79% 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 PWHT595 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 PWHT595?
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 PWHT595 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 PWHT595?
E410NiMo PWHT595 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 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.