Stainless Steel E310Mo-SA (Solution annealed weld metal)
Heat-treated state
UNS W31020
Used when the fabrication receives a full solution anneal to dissolve carbides/σ-phase and restore maximum ductility and corrosion resistance; strength drops, elongation rises.
Values for the SA condition
Other E310Mo tempers and conditions
E310Mo is listed in 4 conditions; see the grade overview at E310Mo.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SAThis page Solution annealed weld metal | Used when the fabrication receives a full solution anneal to dissolve carbides/σ-phase and restore maximum ductility and corrosion resistance; strength drops, elongation rises. | 290 | 540 | 45 | 160 HB | 2 % IACS |
Titania (rutile) covering, AC or DCEP | Choose the rutile-coated version for smoother arc, easy slag removal and better bead appearance in all-position work on AC or DCEP power sources. | 395 | 590 | 34 | 185 HB | 2 % IACS |
AWDefault As-welded deposit | Default condition: properties of the undiluted deposit in the as-welded state, no PWHT. | 400 | 595 | 35 | 185 HB | 2 % IACS |
Lime-basic covering, DCEP | Choose the basic-coated version for lowest hydrogen/oxygen, best toughness and crack resistance on restrained or thick joints; DC electrode-positive only. | 410 | 600 | 36 | 185 HB | 2 % IACS |
What is E310Mo-SA?
E310Mo-SA is E310Mo heat treated to SA — used when the fabrication receives a full solution anneal to dissolve carbides/σ-phase and restore maximum ductility and corrosion resistance; strength drops, elongation rises. E310Mo-SA has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 72% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 198 GPa (28.7 Msi). E310Mo-SA 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). AW is the default condition FabDigit quotes; SA is available on request or by drawing note.
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
- Good corrosion resistance — 78/100, better than 84% of stainless steel grades
- Tough — resists crack growth — 190 MPa·√m (172.9 ksi·√in), better than 77% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- High embodied carbon — 6 kg CO₂/kg, worse than 88% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
E310Mo-SA properties
Typical room-temperature values for E310Mo-SA; 22 are specific to this condition. Other listed values are E310Mo reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
E310Mo-SA 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).
Mechanical16
E310Mo-SA has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 72% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 198 GPa (28.7 Msi).
Thermal6
E310Mo-SA is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 14.5 W/m·K (8.38 BTU/hr·ft·°F), worse than 72% of stainless steel grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
E310Mo-SA conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 84% of stainless steel grades.
Sustainability4
Producing a kilogram of E310Mo-SA takes about 78 MJ of energy and emits 6 kg of CO₂ — more than 87% of stainless steel grades. Typical recycled content is 50%.
Manufacturability6
E310Mo-SA's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability good (62/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E310Mo-SA
Is E310Mo easy to machine?
Fully austenitic and strongly work-hardening — grind or machine with sharp carbide tools, heavy positive rake, rigid setup and low speed/high feed; expect ~30 % of free-machining steel productivity.
Can E310Mo be welded?
SMAW with short arc, stringer beads, low heat input and interpass ≤150 °C to limit hot cracking in this ferrite-free deposit; redry electrodes (≈300 °C/1 h for -15, per maker for -16) and clean/limit dilution from the base metal.
Can E310Mo be formed, bent or molded?
Not a wrought product; the deposit is very ductile (≥30 % elongation) and can be peened or lightly dressed, but heavy cold work raises hardness fast.
What surface finishes work on E310Mo?
Remove slag fully, then pickle/passivate or mechanically blend and polish; avoid carbon-steel tooling contamination to preserve the passive film.
E310Mo 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 |
|---|---|---|
| CAWS A5.4 undiluted weld metal | ≤ 0.12 | 0.1 |
| Cr | 25 – 28 | 26.5 |
| Ni | 20 – 22 | 21 |
| Mopitting/crevice resistance addition vs E310 | 2 – 3 | 2.5 |
| Mn | 1 – 2.5 | 1.8 |
| Si | ≤ 0.75 | 0.5 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cu | ≤ 0.75 | 0.1 |
| Fe | balance | — |
E310Mo-SA — frequently asked
What is E310Mo-SA used for?
E310Mo-SA is typically used for chemical process equipment, high-temperature corrosive service and flue gas equipment. In short: mo-alloyed 310 electrode; better pitting resistance than E310; service to 1100 °C.
What is the yield strength of E310Mo-SA?
E310Mo-SA has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 72% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is E310Mo-SA easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Fully austenitic and strongly work-hardening — grind or machine with sharp carbide tools, heavy positive rake, rigid setup and low speed/high feed; expect ~30 % of free-machining steel productivity.
Can E310Mo-SA be welded?
Yes — weldability is rated good (62/100). SMAW with short arc, stringer beads, low heat input and interpass ≤150 °C to limit hot cracking in this ferrite-free deposit; redry electrodes (≈300 °C/1 h for -15, per maker for -16) and clean/limit dilution from the base metal.
What surface finishes work on E310Mo-SA?
Remove slag fully, then pickle/passivate or mechanically blend and polish; avoid carbon-steel tooling contamination to preserve the passive film.
Can E310Mo-SA be formed, bent or molded?
Not a wrought product; the deposit is very ductile (≥30 % elongation) and can be peened or lightly dressed, but heavy cold work raises hardness fast.
What is the maximum service temperature of E310Mo-SA?
E310Mo-SA 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.
What is the difference between E310Mo-AW and E310Mo-SA?
AW is the default condition — default condition: properties of the undiluted deposit in the as-welded state, no PWHT. SA: used when the fabrication receives a full solution anneal to dissolve carbides/σ-phase and restore maximum ductility and corrosion resistance; strength drops, elongation rises. Yield strength is 400 MPa in AW versus 290 MPa in SA.
Sources
- AWS A5.4/A5.4M Specification for Stainless Steel Electrodes for Shielded Metal Arc Welding — American Welding Society (2012)
- 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)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
- Stainless SMAW electrode datasheets (E310/E310Mo class) — Böhler Welding / ESAB / Lincoln Electric (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.