Stainless Steel E310H
UNS W31015
E310H is the higher-carbon version of the 25Cr-20Ni fully austenitic electrode (UNS W31015), available with -15 and -16 coatings and used as-welded or after solution treatment (PWHT-SOL).
Reference datasheet — E310H 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
E310H tempers and conditions
E310H is supplied in 4 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
solution annealed ~1100 °C + rapid cool (weldment) | Used only when the welded casting is re-solution treated to dissolve carbides and restore ductility before service. | 340 | 610 | 25 | 175 HB | 2.3 % IACS |
Titania (rutile) coated electrode, AC or DCEP | Pick the rutile-coated version for smoother arc, better bead appearance and easy slag release with AC power sources. | 425 | 655 | 15 | 205 HB | 2.2 % IACS |
AWDefault As-welded deposit | Standard condition in which E310H deposits are tested and used; no post-weld heat treatment applied. | 430 | 660 | 16 | 200 HB | 2.2 % IACS |
Lime (basic) coated electrode, DCEP only | Pick the basic-coated version for out-of-position work and maximum crack resistance on heavily restrained heat-resistant castings. | 440 | 670 | 17 | 200 HB | 2.2 % IACS |
What is E310H?
E310H is the higher-carbon version of the 25Cr-20Ni fully austenitic electrode (UNS W31015), available with -15 and -16 coatings and used as-welded or after solution treatment (PWHT-SOL). The added carbon raises creep strength for sustained elevated-temperature service to 1100 °C, with about 430 MPa yield, 660 MPa tensile and 200 HB in the as-welded condition. As-welded elongation is about 16 %, so cold straightening of weldments is not advisable, and the ferrite-free, carbide-bearing deposit remains hot-crack sensitive. Choose E310 where ductility and lower carbon matter more than creep strength. E310H has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,330°C (2,426 °F). E310H has a yield strength of 430 MPa (62.4 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 67% of stainless steel grades. Elongation at break is 16% and the elastic modulus is 195 GPa (28.3 Msi).
What is E310H used for?
- high-temperature furnace components
- boiler support structures
- radiant tube welding
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
Limitations
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Limited ductility — 16%, worse than 88% of stainless steel grades
- Limited formability — 20/100, worse than 86% of stainless steel grades
- High embodied carbon — 5.6 kg CO₂/kg, worse than 83% of stainless steel grades
- Low fracture toughness — 90 MPa·√m (81.9 ksi·√in), worse than 75% of stainless steel grades
E310H properties
Typical room-temperature values for E310H-AW; bars are the position among stainless steel grades.
Physical3
E310H has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,330°C (2,426 °F).
Mechanical16
E310H has a yield strength of 430 MPa (62.4 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 67% of stainless steel grades. Elongation at break is 16% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
E310H is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 15.4 µm/m·K (8.56 µin/in·°F).
Electrical3
E310H conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental2
Corrosion resistance is good (58/100), worse than 62% of stainless steel grades.
Sustainability4
Producing a kilogram of E310H takes about 65 MJ of energy and emits 5.6 kg of CO₂ — more than 79% of stainless steel grades. Typical recycled content is 45%.
Manufacturability7
E310H's machinability is poor (26/100, worse than 84% of stainless steel grades); weldability good (60/100); formability poor (20/100).
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. E310H is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E310H
Is E310H easy to machine?
Machine deposits with sharp carbide tooling, low speed, heavy positive feed and flood coolant — the fully austenitic, carbide-bearing metal work-hardens fast and smears.
Can E310H be welded?
Redry electrodes (about 250–300 °C), weld with short arc and stringer beads, keep interpass temperature low and heat input modest to limit hot cracking; no preheat needed on austenitic base metal but preheat heat-resistant castings per their spec.
Can E310H be formed, bent or molded?
Not a wrought product — deposit shaping is by weld sequencing and grinding; cold straightening of weldments should be avoided because as-welded ductility is limited.
E310H 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 |
|---|---|---|
| Craised carbon for creep strength | 0.35 – 0.45 | 0.4 |
| Cr | 25 – 28 | 26.5 |
| Ni | 20 – 22.5 | 21 |
| Mn | 1 – 2.5 | 1.8 |
| Si | ≤ 0.75 | 0.5 |
| Moresidual | ≤ 0.75 | |
| Curesidual | ≤ 0.75 | |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on E310H?
Grind or pickle/passivate to remove slag, oxide and heat tint; deposits polish to a moderate finish but do not colour-match low-carbon 310 weld metal after high-temperature service.
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 E310H in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W31015
- Also called
- AWS A5.4 E310H
How much does E310H cost?
E310H is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
E310H — frequently asked
What is E310H used for?
E310H is typically used for high-temperature furnace components, boiler support structures and radiant tube welding. In short: creep-strength 310 electrode; service to 1100 °C; higher carbon than E310.
What is the yield strength of E310H?
E310H has a typical yield strength of 430 MPa (62.4 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 67% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is E310H easy to machine?
Not especially — machinability is rated poor (26/100, worse than 84% of stainless steel grades). Machine deposits with sharp carbide tooling, low speed, heavy positive feed and flood coolant — the fully austenitic, carbide-bearing metal work-hardens fast and smears.
Can E310H be welded?
Yes — weldability is rated good (60/100). Redry electrodes (about 250–300 °C), weld with short arc and stringer beads, keep interpass temperature low and heat input modest to limit hot cracking; no preheat needed on austenitic base metal but preheat heat-resistant castings per their spec.
What surface finishes work on E310H?
Grind or pickle/passivate to remove slag, oxide and heat tint; deposits polish to a moderate finish but do not colour-match low-carbon 310 weld metal after high-temperature service.
Can E310H be formed, bent or molded?
Not a wrought product — deposit shaping is by weld sequencing and grinding; cold straightening of weldments should be avoided because as-welded ductility is limited.
What is the maximum service temperature of E310H?
E310H is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does E310H cost?
E310H is a high-cost stainless steel ($$$$), 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 Shielded Metal Arc Welding — AWS (2012)
- ASME BPVC Section II Part C — SFA-5.4 — ASME (2023)
- 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)
- Stainless covered electrode 310H product data — Böhler Welding / ESAB (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.