Stainless Steel 1.4315-AT (+AT / Annealed)
Precip hard · default condition
EN 1.4315
Standard stocked condition for plate, sheet, tube and forgings; best corrosion resistance and ductility.
Values for the AT condition
Other 1.4315 tempers and conditions
1.4315 is listed in 10 conditions; see the grade overview at 1.4315.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ATDefaultThis page +AT / Annealed | Standard stocked condition for plate, sheet, tube and forgings; best corrosion resistance and ductility. | 330 | 650 | 50 | 180 HB | — |
cold drawn to Rm ≥ 700 MPa (EN 10088-3) | Lowest EN strain-hardened class; use where slightly higher strength than annealed bar is needed with good ductility. | 400 | 740 | 25 | 20 HRC | 2.4 % IACS |
Cold drawn | Bright cold-drawn round/hex bar for machined fasteners and shafts; better tolerance, finish and strength than annealed. | 550 | 760 | 30 | 240 HB | — |
cold drawn to Rm ≥ 800 MPa (EN 10088-3) | Common strain-hardened bar class for shafts and cold-headed parts. | 550 | 840 | 20 | 25 HRC | 2.4 % IACS |
Quarter hard | Sheet/strip where moderate strength increase is needed but bending is still required. | 550 | 900 | 20 | 25 HRC | 2.4 % IACS |
cold drawn to Rm ≥ 900 MPa (EN 10088-3) | High-strength small-diameter bar/wire where machining is limited and ductility can be traded for strength. | 700 | 940 | 14 | 30 HRC | 2.4 % IACS |
cold drawn to Rm ≥ 1000 MPa (EN 10088-3) | Maximum EN strain-hardened bar/wire class; springs, small fasteners and highly loaded pins. | 800 | 1,050 | 12 | 34 HRC | 2.4 % IACS |
Half hard | Structural strip, clamps and stamped parts needing high strength with limited forming. | 800 | 1,070 | 12 | 32 HRC | 2.4 % IACS |
Three-quarter hard | Near-maximum strength strip for flat springs and shims; forming limited to gentle bends. | 965 | 1,240 | 10 | 37 HRC | 2.4 % IACS |
Full hard | Highest cold-worked strength; springs, blades and wear strips, essentially non-formable except flat work. | 1,000 | 1,310 | 8 | 41 HRC | 2.4 % IACS |
What is 1.4315-AT?
1.4315-AT is 1.4315 in the AT condition — standard stocked condition for plate, sheet, tube and forgings; best corrosion resistance and ductility. 1.4315-AT has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 650 MPa (94.3 ksi) — weaker than 57% of stainless steel grades. Elongation at break is 50% and the elastic modulus is 200 GPa (29 Msi). 1.4315-AT 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).
Advantages
- Ductile — tolerates forming and impact — 50%, better than 90% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
- Forms and bends easily — 72/100, better than 84% of stainless steel grades
- Readily welded — 80/100, better than 80% of stainless steel grades
1.4315-AT properties
Typical room-temperature values for 1.4315-AT; 14 are specific to this condition. Other listed values are 1.4315 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4315-AT 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
1.4315-AT has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 650 MPa (94.3 ksi) — weaker than 57% of stainless steel grades. Elongation at break is 50% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4315-AT is rated for continuous service to 600°C (1,112 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 16 µm/m·K (8.89 µin/in·°F).
Electrical3
1.4315-AT conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 58% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4315-AT takes about 55 MJ of energy and emits 5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
1.4315-AT's machinability is poor (33/100, worse than 57% of stainless steel grades); weldability very good (80/100); formability very good (72/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4315-AT
Is 1.4315 easy to machine?
Gummy and strongly work-hardening — use rigid setups, positive-rake carbide, heavy constant feed, no dwell, and copious coolant; expect ~40% of AISI 1212 and slightly worse than plain 304 due to the nitrogen.
Can 1.4315 be welded?
Readily welded by GTAW/GMAW/SMAW with 308L/308LSi (or 309L to carbon steel); no preheat, keep interpass below ~150 °C and heat input low, and avoid weaving to limit sensitization and distortion.
Can 1.4315 be formed, bent or molded?
Cold forms and deep draws well but needs ~30–40% higher press loads and more springback than 304; hot work 1150–1200 °C followed by solution anneal at 1020–1080 °C with rapid quench.
What surface finishes work on 1.4315?
Pickle and passivate (or electropolish) after welding to restore the passive film; takes a mirror polish easily, and can be bead-blasted, brushed or PVD-coated but not anodized.
1.4315 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 |
|---|---|---|
| CASTM 304N allows 0.08 max | ≤ 0.06 | 0.04 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 2 | 1.5 |
| P | ≤ 0.05 | — |
| SASTM permits 0.030 max | ≤ 0.02 | — |
| Cr | 18 – 20 | 19 |
| Ni | 8 – 11 | 9.5 |
| Nsolid-solution strengthener; ASTM 304N 0.10–0.16 | 0.12 – 0.22 | 0.16 |
| Fe | balance | — |
1.4315-AT — frequently asked
What is 1.4315-AT used for?
1.4315-AT is typically used for structural fasteners, pressure equipment needing higher yield strength and marine hardware. In short: nitrogen-strengthened 304; higher-yield austenitic fastener grade; cryogenic to 600 °C.
What is the yield strength of 1.4315-AT?
1.4315-AT has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 650 MPa (94.3 ksi) — weaker than 57% of stainless steel grades. Strength varies by condition: see the 10 listed tempers.
Is 1.4315-AT easy to machine?
Not especially — machinability is rated poor (33/100, worse than 57% of stainless steel grades). Gummy and strongly work-hardening — use rigid setups, positive-rake carbide, heavy constant feed, no dwell, and copious coolant; expect ~40% of AISI 1212 and slightly worse than plain 304 due to the nitrogen.
Can 1.4315-AT be welded?
Yes — weldability is rated very good (80/100). Readily welded by GTAW/GMAW/SMAW with 308L/308LSi (or 309L to carbon steel); no preheat, keep interpass below ~150 °C and heat input low, and avoid weaving to limit sensitization and distortion.
What surface finishes work on 1.4315-AT?
Pickle and passivate (or electropolish) after welding to restore the passive film; takes a mirror polish easily, and can be bead-blasted, brushed or PVD-coated but not anodized.
Can 1.4315-AT be formed, bent or molded?
Cold forms and deep draws well but needs ~30–40% higher press loads and more springback than 304; hot work 1150–1200 °C followed by solution anneal at 1020–1080 °C with rapid quench.
What is the maximum service temperature of 1.4315-AT?
1.4315-AT is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4315-AT and 1.4315-FH?
AT is the default condition — standard stocked condition for plate, sheet, tube and forgings; best corrosion resistance and ductility. FH: highest cold-worked strength; springs, blades and wear strips, essentially non-formable except flat work. Yield strength is 330 MPa in AT versus 1,000 MPa in FH.
Sources
- EN 10088-1/-2/-3 Stainless steels — grade X5CrNiN19-9 (1.4315) — CEN (2014)
- ASTM A240/A240M — Cr and Cr-Ni stainless plate, sheet, strip (S30451, 304N) — ASTM (2023)
- ASTM A666 — Annealed or Cold-Worked Austenitic Stainless Sheet, Strip, Plate and Flat Bar — ASTM (2015)
- EN 10028-7 — Flat products for pressure purposes, stainless steels — CEN (2016)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- Outokumpu Steel Grades / Sandvik austenitic grade datasheets — Outokumpu / Sandvik (2022)
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.