Stainless Steel 310MoLN
GB 310MoLN · UNS S31050
AISI 310MoLN (UNS S31050) is a high-purity 25Cr-20Ni austenitic stainless modified with molybdenum and controlled nitrogen, which raises strength and corrosion resistance above standard 310.
Reference datasheet — 310MoLN 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 Annealed condition
310MoLN tempers and conditions
310MoLN is supplied in 3 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
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 | — |
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 | — |
Supply forms, finishes and certifications
Ways 310MoLN is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
1D | Hot rolled, solution annealed, pickled plate | Surface finish |
2B | Cold rolled, annealed, pickled and lightly skin-passed sheet | Surface finish |
What is 310MoLN?
AISI 310MoLN (UNS S31050) is a high-purity 25Cr-20Ni austenitic stainless modified with molybdenum and controlled nitrogen, which raises strength and corrosion resistance above standard 310. It is used in chemical process and pressure equipment needing both strength and wet-corrosion resistance, supplied as annealed plate, 2B and 1D sheet, cold-drawn bar and as-welded assemblies. Annealed properties are about 300 MPa yield, 600 MPa tensile, 45 % elongation and 165 HB, with maximum service temperature 550 °C — far below oxidation grades such as 310S. Machinability rates 30/100 and stock is limited. 310MoLN 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). 310MoLN has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 196 GPa (28.4 Msi).
What is 310MoLN used for?
- chemical process reactors
- high-temperature pressure equipment
- flue-gas desulfurization components
Advantages
- Tough — resists crack growth — 220 MPa·√m (200.2 ksi·√in), better than 97% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
- Forms and bends easily — 68/100, better than 75% of stainless steel grades
Limitations
- Poor heat conductor — 12.5 W/m·K (7.22 BTU/hr·ft·°F), worse than 90% 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 properties
Typical room-temperature values for 310MoLN-Annealed; bars are the position among stainless steel grades.
Physical3
310MoLN 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 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
310MoLN is rated for continuous service to 550°C (1,022 °F). It conducts heat at 12.5 W/m·K (7.22 BTU/hr·ft·°F), worse than 90% of stainless steel grades. Thermal expansion is 14.5 µm/m·K (8.06 µin/in·°F).
Electrical3
310MoLN conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 73% of stainless steel grades.
Sustainability4
Producing a kilogram of 310MoLN 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's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability very good (75/100); formability good (68/100).
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. 310MoLN is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 310MoLN
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.
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 | — |
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.
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 310MoLN in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S31050
How much does 310MoLN cost?
310MoLN 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.
310MoLN — frequently asked
What is 310MoLN used for?
310MoLN 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?
310MoLN has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 68% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 310MoLN easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% 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 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?
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 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?
310MoLN 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.
How much does 310MoLN cost?
310MoLN 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
- 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; 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.