Stainless Steel 310L NAG-AW (As-welded deposit)
Heat-treated state
UNS S30600
Condition of field-welded joints; acceptable for most HNO₃ duty with matching filler, but weld metal corrodes faster than annealed base metal.
Values for the AW condition
Other 310L NAG tempers and conditions
310L NAG is listed in 3 conditions; see the grade overview at 310L NAG.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault solution annealed (~1050–1120 °C) + rapid quench | Standard supply condition for all product forms; maximum corrosion resistance in nitric acid service. | 305 | 620 | 48 | 165 HB | 1.9 % IACS |
AWThis page As-welded deposit | Condition of field-welded joints; acceptable for most HNO₃ duty with matching filler, but weld metal corrodes faster than annealed base metal. | 330 | 590 | 30 | 180 HB | 1.9 % IACS |
Cold drawn | Bar for machined valve, pump and fastener parts in nitric acid plants; higher strength, lower ductility. | 560 | 760 | 25 | 20 HRC | 1.9 % IACS |
What is 310L NAG-AW?
310L NAG-AW is 310L NAG heat treated to AW — condition of field-welded joints; acceptable for most HNO₃ duty with matching filler, but weld metal corrodes faster than annealed base metal. 310L NAG-AW 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 30% and the elastic modulus is 193 GPa (28 Msi). 310L NAG-AW has a density of 7.5 g/cm³ (0.271 lb/in³), lighter than 99% of stainless steel grades. It melts at 1,370°C (2,498 °F). Annealed is the default condition FabDigit quotes; AW is available on request or by drawing note.
Limitations
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Poor heat conductor — 13 W/m·K (7.51 BTU/hr·ft·°F), worse than 85% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
310L NAG-AW properties
Typical room-temperature values for 310L NAG-AW; 22 are specific to this condition. Other listed values are 310L NAG reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
310L NAG-AW has a density of 7.5 g/cm³ (0.271 lb/in³), lighter than 99% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
310L NAG-AW 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 30% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
310L NAG-AW is rated for continuous service to 550°C (1,022 °F). It conducts heat at 13 W/m·K (7.51 BTU/hr·ft·°F), worse than 85% of stainless steel grades. Thermal expansion is 15.7 µm/m·K (8.72 µin/in·°F).
Electrical3
310L NAG-AW conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 63% of stainless steel grades.
Sustainability4
Producing a kilogram of 310L NAG-AW takes about 57 MJ of energy and emits 5.2 kg of CO₂ — more than 62% of stainless steel grades. Typical recycled content is 55%.
Manufacturability7
310L NAG-AW's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (65/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 310L NAG-AW
Is 310L NAG easy to machine?
Slow, abrasive cutting: the ~4 % Si and strong work hardening demand rigid setups, positive-rake carbide/coated inserts, heavy flood coolant, low speed and constant feed to avoid glazing.
Can 310L NAG be welded?
GTAW/GMAW/SMAW with matching high-Si (S30600-type) filler; keep heat input and interpass temperature low, no preheat, and solution-anneal or use matching filler when full nitric-acid resistance across the weld is required.
Can 310L NAG be formed, bent or molded?
Cold forms like an austenitic 300 series but with higher springback and work-hardening; hot work 1150–900 °C followed by solution anneal at 1050–1120 °C and rapid quench — avoid slow cooling through 550–850 °C.
What surface finishes work on 310L NAG?
Pickle (HNO₃-HF) and passivate after hot work or welding to remove Si-rich scale; electropolishing gives the cleanest surface for acid service. Not anodizable.
310L NAG 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 |
|---|---|---|
| Cultra-low carbon | ≤ 0.02 | 0.01 |
| Sikey alloying addition for nitric-acid passivity | 3.7 – 4.3 | 4 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.02 | 0.02 |
| S | ≤ 0.02 | 0 |
| Cr | 17 – 18.5 | 17.8 |
| Ni | 14 – 15.5 | 14.8 |
| Mo | ≤ 0.2 | 0.1 |
| Fe | balance | — |
310L NAG-AW — frequently asked
What is 310L NAG-AW used for?
310L NAG-AW is typically used for furnace muffles, radiant tubes and heat-treatment fixtures. In short: high-silicon nitric-acid stainless; low-carbon 310-type; stabilised weld-zone corrosion resistance.
What is the yield strength of 310L NAG-AW?
310L NAG-AW 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 310L NAG-AW easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Slow, abrasive cutting: the ~4 % Si and strong work hardening demand rigid setups, positive-rake carbide/coated inserts, heavy flood coolant, low speed and constant feed to avoid glazing.
Can 310L NAG-AW be welded?
Yes — weldability is rated good (65/100). GTAW/GMAW/SMAW with matching high-Si (S30600-type) filler; keep heat input and interpass temperature low, no preheat, and solution-anneal or use matching filler when full nitric-acid resistance across the weld is required.
What surface finishes work on 310L NAG-AW?
Pickle (HNO₃-HF) and passivate after hot work or welding to remove Si-rich scale; electropolishing gives the cleanest surface for acid service. Not anodizable.
Can 310L NAG-AW be formed, bent or molded?
Cold forms like an austenitic 300 series but with higher springback and work-hardening; hot work 1150–900 °C followed by solution anneal at 1050–1120 °C and rapid quench — avoid slow cooling through 550–850 °C.
What is the maximum service temperature of 310L NAG-AW?
310L NAG-AW 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 310L NAG Annealed and 310L NAG-CD?
Annealed is the default condition — standard supply condition for all product forms; maximum corrosion resistance in nitric acid service. CD: bar for machined valve, pump and fastener parts in nitric acid plants; higher strength, lower ductility. Yield strength is 305 MPa in Annealed versus 560 MPa in CD.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip (UNS S30600) — ASTM International (2023)
- ASTM A479/A479M — Stainless Steel Bars and Shapes for Boilers and Pressure Vessels — ASTM International (2021)
- Alloy 306 / 310L NAG high-silicon austenitic stainless steel for nitric acid service — Industeel (ArcelorMittal) (2020)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (nitric acid service) — ASM International (2005)
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.