Stainless Steel E310Nb
UNS W31017
E310Nb is a niobium-stabilised 25Cr-20Ni austenitic electrode (UNS W31017), offered with -15, -16 and -17 coatings and used as-welded or after PWHT.
Reference datasheet — E310Nb is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AW condition
E310Nb tempers and conditions
E310Nb is supplied in 5 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Post-weld heat treated | Used for overlays and vessel parts that are re-solution-annealed after welding: lower strength, higher ductility and toughness. | 300 | 570 | 42 | 160 HB | 2.2 % IACS |
E310Nb-17 | Choose for the flattest, best-wetting bead on flat/horizontal fillets and sheet; slightly more fluid slag than -16. | 415 | 595 | 30 | 185 HB | 2.2 % IACS |
AWDefault As-welded deposit | Default condition: properties of the undiluted deposit in the as-welded state, as classified by AWS A5.4. | 420 | 600 | 32 | 9 HRC | 2.2 % IACS |
E310Nb-16 | Most widely stocked coating: smooth arc on AC or DC, easy slag release, good bead appearance for general fabrication. | 420 | 600 | 30 | 185 HB | 2.2 % IACS |
E310Nb-15 | Pick for out-of-position work, heavy restraint or maximum weld-metal cleanliness/toughness; DC electrode positive only. | 430 | 610 | 33 | 180 HB | 2.2 % IACS |
What is E310Nb?
E310Nb is a niobium-stabilised 25Cr-20Ni austenitic electrode (UNS W31017), offered with -15, -16 and -17 coatings and used as-welded or after PWHT. Stabilisation ties up carbon to resist intergranular corrosion in high-carbon fully austenitic deposits and overlays serving to 1050 °C, with about 420 MPa yield, 600 MPa tensile, 32 % elongation and 180 HB (88 HRB). The deposit is ferrite-free and hot-crack sensitive, and availability is narrower than for E310. Where creep strength governs rather than intergranular attack, E310H is the closer choice. E310Nb has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F). E310Nb has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
What is E310Nb used for?
- stabilized fully-austenitic overlays
- high-temperature fixtures
- furnace component repair
Advantages
- High service temperature — 1,050°C (1,922 °F), better than 91% of stainless steel grades
Limitations
- High embodied carbon — 6 kg CO₂/kg, worse than 88% of stainless steel grades
E310Nb properties
Typical room-temperature values for E310Nb-AW; bars are the position among stainless steel grades.
Physical3
E310Nb has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical17
E310Nb has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
E310Nb is rated for continuous service to 1,050°C (1,922 °F). It conducts heat at 14.2 W/m·K (8.2 BTU/hr·ft·°F), worse than 76% of stainless steel grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
E310Nb conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 59% of stainless steel grades.
Sustainability4
Producing a kilogram of E310Nb takes about 62 MJ of energy and emits 6 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 55%.
Manufacturability7
E310Nb's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability very good (72/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. E310Nb is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E310Nb
Is E310Nb easy to machine?
Weld metal is tough and strongly work-hardening — use rigid setups, positive rake carbide, heavy feeds, low speeds and flood coolant; avoid dwelling.
Can E310Nb be welded?
SMAW with short arc, stringer beads, low heat input and interpass ≤150 °C; fully austenitic deposit is hot-crack prone, so keep dilution low, avoid weaving and re-dry electrodes (250–350 °C) before use.
Can E310Nb be formed, bent or molded?
Deposit is not intended for forming; grinding and light dressing only, expecting high springback and rapid work hardening if cold worked.
E310Nb 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 |
|---|---|---|
| Chigher C than 310L types, intentional for creep strength | ≤ 0.12 | 0.1 |
| Cr | 25 – 28 | 26.5 |
| Ni | 20 – 22 | 21 |
| Mn | 1 – 2.5 | 1.8 |
| Si | ≤ 0.75 | 0.45 |
| NbNb+Ta; carbide stabilizer (formerly written Cb) | 0.7 – 1 | 0.85 |
| Mo | ≤ 0.75 | 0.2 |
| Cu | ≤ 0.75 | 0.15 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance |
What surface finishes work on E310Nb?
Grind/blend with stainless-dedicated abrasives, then pickle and passivate per ASTM A380/A967; electropolishing gives good luster, no anodizing.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel E310Nb in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W31017
- Also called
- AWS A5.4 E310NbE310Cb
How much does E310Nb cost?
E310Nb is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
E310Nb — frequently asked
What is E310Nb used for?
E310Nb is typically used for stabilized fully-austenitic overlays, high-temperature fixtures and furnace component repair. In short: nb-stabilized 310 deposit; resists intergranular attack; overlay and repair electrode.
What is the yield strength of E310Nb?
E310Nb has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is E310Nb easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Weld metal is tough and strongly work-hardening — use rigid setups, positive rake carbide, heavy feeds, low speeds and flood coolant; avoid dwelling.
Can E310Nb be welded?
Yes — weldability is rated very good (72/100). SMAW with short arc, stringer beads, low heat input and interpass ≤150 °C; fully austenitic deposit is hot-crack prone, so keep dilution low, avoid weaving and re-dry electrodes (250–350 °C) before use.
What surface finishes work on E310Nb?
Grind/blend with stainless-dedicated abrasives, then pickle and passivate per ASTM A380/A967; electropolishing gives good luster, no anodizing.
Can E310Nb be formed, bent or molded?
Deposit is not intended for forming; grinding and light dressing only, expecting high springback and rapid work hardening if cold worked.
What is the maximum service temperature of E310Nb?
E310Nb is rated for continuous use to about 1,050°C (1,922 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E310Nb-AW and E310Nb PWHT?
AW is the default condition — default condition: properties of the undiluted deposit in the as-welded state, as classified by AWS A5.4. PWHT: used for overlays and vessel parts that are re-solution-annealed after welding: lower strength, higher ductility and toughness. Yield strength is 420 MPa in AW versus 300 MPa in PWHT.
How much does E310Nb cost?
E310Nb is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AWS A5.4/A5.4M — Specification for Stainless Steel Electrodes for SMAW — American Welding Society (2012)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Stainless SMAW consumables — 310-type / 310Nb electrode data — ESAB / Böhler Welding (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.