Stainless Steel 310MoLN As Welded
Finish state
GB 310MoLN · UNS S31050
Reference condition for welded joints and welded tube: strength close to base metal, but heavily oxidizing urea/nitric service usually calls for a post-weld solution anneal or pickling.
Values for the As Welded condition
Other 310MoLN tempers and conditions
310MoLN is listed in 3 conditions; see the grade overview at 310MoLN.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault solution annealed and quenched (1050–1150 °C, rapid cool) | Standard delivery condition for plate, bar, seamless tube and fittings — maximum corrosion resistance and ductility. | 300 | 600 | 45 | 165 HB | — |
As WeldedThis page matching 25.22.2.LMN weld metal, no post-weld solution anneal | Reference condition for welded joints and welded tube: strength close to base metal, but heavily oxidizing urea/nitric service usually calls for a post-weld solution anneal or pickling. | 330 | 590 | 35 | 180 HB | 2 % IACS |
Cold drawn | Pick when higher proof strength, close tolerance and a bright finish matter more than ductility and full corrosion optimum. | 510 | 720 | 25 | 220 HB | — |
What is 310MoLN As Welded?
310MoLN As Welded is 310MoLN supplied in the As Welded condition — reference condition for welded joints and welded tube: strength close to base metal, but heavily oxidizing urea/nitric service usually calls for a post-weld solution anneal or pickling. 310MoLN As Welded has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 590 MPa (85.6 ksi) — weaker than 57% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 195 GPa (28.3 Msi). 310MoLN As Welded has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,385°C (2,525 °F). Annealed is the default condition FabDigit quotes; As Welded is available on request or by drawing note.
Limitations
- Poor heat conductor — 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 93% of stainless steel grades
- High embodied carbon — 5.6 kg CO₂/kg, worse than 83% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
310MoLN As Welded properties
Typical room-temperature values for 310MoLN As Welded; 22 are specific to this condition. Other listed values are 310MoLN reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
310MoLN As Welded has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Mechanical16
310MoLN As Welded has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 590 MPa (85.6 ksi) — weaker than 57% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
310MoLN As Welded is rated for continuous service to 550°C (1,022 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 93% of stainless steel grades. Thermal expansion is 14.5 µm/m·K (8.06 µin/in·°F).
Electrical3
310MoLN As Welded conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 59% of stainless steel grades.
Sustainability4
Producing a kilogram of 310MoLN As Welded takes about 78 MJ of energy and emits 5.6 kg of CO₂ — more than 87% of stainless steel grades. Typical recycled content is 55%.
Manufacturability7
310MoLN As Welded's machinability is poor (27/100, worse than 83% of stainless steel grades); weldability very good (75/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 310MoLN As Welded
Is 310MoLN easy to machine?
Treat as a difficult austenitic: rigid setup, positive-rake sharp carbide, low speed / heavy positive feed, flood emulsion, and never dwell — nitrogen alloying makes it work-harden fast and gummy.
Can 310MoLN be welded?
Excellent weldability with GTAW/GMAW/SMAW using matching low-C high-N 25.22.2.LMN filler (or over-alloyed 25-22-2); no preheat, low interpass, low heat input, back-purge with Ar (+N2 optional) and pickle/passivate all heat tint.
Can 310MoLN be formed, bent or molded?
Cold forms and deep draws like 310/316L but needs ~30–50 % more press force and generous springback allowance; hot work 1150–900 °C followed by solution anneal and quench to redissolve sigma/chi phases.
What surface finishes work on 310MoLN?
Not anodizable — finish by pickling (HNO3/HF), passivation to ASTM A967 or electropolishing; mechanical polish to 2K/mirror is straightforward due to the clean, low-inclusion melt.
310MoLN 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 |
|---|---|---|
| CEN 1.4466 limits C ≤ 0.020 | ≤ 0.03 | 0.02 |
| SiASTM A240 S31050; EN allows ≤0.70 | ≤ 0.4 | 0.3 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.02 | 0.02 |
| SEN 1.4466 S ≤ 0.010 | ≤ 0.02 | 0 |
| Cr | 24 – 26 | 25 |
| Ni | 20.5 – 23.5 | 22 |
| Mo | 1.6 – 2.6 | 2.1 |
| NEN 1.4466: 0.10–0.16 | 0.09 – 0.15 | 0.12 |
| Fe | balance | — |
310MoLN As Welded — frequently asked
What is 310MoLN As Welded used for?
310MoLN As Welded is typically used for chemical process reactors, high-temperature pressure equipment and flue-gas desulfurization components. In short: mo and N modified 310; best corrosion resistance in 310 family; low-carbon, high-purity melt.
What is the yield strength of 310MoLN As Welded?
310MoLN As Welded has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 590 MPa (85.6 ksi) — weaker than 57% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 310MoLN As Welded easy to machine?
Not especially — machinability is rated poor (27/100, worse than 83% of stainless steel grades). Treat as a difficult austenitic: rigid setup, positive-rake sharp carbide, low speed / heavy positive feed, flood emulsion, and never dwell — nitrogen alloying makes it work-harden fast and gummy.
Can 310MoLN As Welded be welded?
Yes — weldability is rated very good (75/100). Excellent weldability with GTAW/GMAW/SMAW using matching low-C high-N 25.22.2.LMN filler (or over-alloyed 25-22-2); no preheat, low interpass, low heat input, back-purge with Ar (+N2 optional) and pickle/passivate all heat tint.
What surface finishes work on 310MoLN As Welded?
Not anodizable — finish by pickling (HNO3/HF), passivation to ASTM A967 or electropolishing; mechanical polish to 2K/mirror is straightforward due to the clean, low-inclusion melt.
Can 310MoLN As Welded be formed, bent or molded?
Cold forms and deep draws like 310/316L but needs ~30–50 % more press force and generous springback allowance; hot work 1150–900 °C followed by solution anneal and quench to redissolve sigma/chi phases.
What is the maximum service temperature of 310MoLN As Welded?
310MoLN As Welded is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 310MoLN Annealed and 310MoLN-CD?
Annealed is the default condition — standard delivery condition for plate, bar, seamless tube and fittings — maximum corrosion resistance and ductility. CD: pick when higher proof strength, close tolerance and a bright finish matter more than ductility and full corrosion optimum. Yield strength is 300 MPa in Annealed versus 510 MPa in CD.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip (UNS S31050) — ASTM International (2023)
- ASTM A213 / A312 — Seamless Austenitic Stainless Tube and Pipe — ASTM International (2022)
- EN 10088-1/-2 — Stainless steels: list of grades and technical delivery conditions (X1CrNiMoN25-22-2, 1.4466) — CEN (2014)
- Sandvik 2RE10 (S31050) tube and pipe datasheet — Alleima (Sandvik Materials Technology) (2022)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Corrosion Handbook / Stainless Steel Handbook — Outokumpu (2021)
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.