Stainless Steel 310MoLN Annealed
Temper · default condition
GB 310MoLN · UNS S31050
Standard delivery condition for plate, bar, seamless tube and fittings — maximum corrosion resistance and ductility.
Values for the Annealed 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 |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page 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 | — |
What is 310MoLN Annealed?
310MoLN Annealed is 310MoLN in the Annealed temper — standard delivery condition for plate, bar, seamless tube and fittings — maximum corrosion resistance and ductility. 310MoLN Annealed 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). 310MoLN Annealed 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).
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 Annealed properties
Typical room-temperature values for 310MoLN Annealed; 14 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 Annealed 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 Annealed 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 Annealed 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 Annealed 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 Annealed 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 Annealed'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. Confirm any required mill or lot documentation when quoting.
Working with 310MoLN Annealed
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 Annealed — frequently asked
What is 310MoLN Annealed used for?
310MoLN Annealed 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 Annealed?
310MoLN Annealed 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 Annealed 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 Annealed 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 Annealed?
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 Annealed 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 Annealed?
310MoLN Annealed 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.