Stainless Steel 1.4460 H+AT
Heat-treated state
EN 1.4460
H+AT = hot finished / hot rolled bar, solution annealed
Large-diameter bar for machined valve bodies and stems where cold drawing is impractical.
Values for the H+AT condition
Other 1.4460 tempers and conditions
1.4460 is listed in 5 conditions; see the grade overview at 1.4460.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded deposit | Condition of fabricated joints when re-solution annealing is impossible; expect lower HAZ toughness and reduced pitting resistance versus the parent plate. | 480 | 690 | 18 | 25 HRC | 2.2 % IACS |
H+ATThis page Hot finished / hot rolled bar, solution annealed | Large-diameter bar for machined valve bodies and stems where cold drawing is impractical. | 490 | 700 | 25 | 22 HRC | 2.2 % IACS |
Forged, solution annealed and quenched | Flanges, tube sheets and heavy fittings; requires full re-solution after forging to dissolve σ/intermetallics formed in the 600–950 °C range. | 490 | 700 | 24 | 23 HRC | 2.2 % IACS |
ATDefault solution annealed (1020–1100 °C) and rapidly quenched | Standard delivery condition for plate, bar, forgings and tube — balanced 50/50 ferrite/austenite with best corrosion resistance and toughness. | 500 | 720 | 25 | 23 HRC | 2.2 % IACS |
solution annealed then cold drawn bar/wire | Cold drawn round bar for shafts, fasteners and pump parts needing closer tolerance and higher strength; ductility and toughness fall with the cold work. | 680 | 850 | 15 | 29 HRC | 2.2 % IACS |
What is 1.4460 H+AT?
1.4460 H+AT is 1.4460 heat treated to H+AT — large-diameter bar for machined valve bodies and stems where cold drawing is impractical. 1.4460 H+AT has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 76% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi). 1.4460 H+AT has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,350°C (2,462 °F). AT is the default condition FabDigit quotes; H+AT is available on request or by drawing note.
Advantages
- Good corrosion resistance — 76/100, better than 80% of stainless steel grades
- High strength — 490 MPa (71.1 ksi), better than 76% of stainless steel grades
Limitations
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
1.4460 H+AT properties
Typical room-temperature values for 1.4460 H+AT; 23 are specific to this condition. Other listed values are 1.4460 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4460 H+AT has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical17
1.4460 H+AT has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 76% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4460 H+AT is rated for continuous service to 280°C (536 °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 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
1.4460 H+AT conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (76/100), better than 80% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4460 H+AT takes about 62 MJ of energy and emits 4.6 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4460 H+AT's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability good (55/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4460 H+AT
Is 1.4460 easy to machine?
Machine like 2205 but tougher: rigid setups, sharp coated carbide, ~30–40 % lower cutting speed than 316L, heavy positive feed to cut under the work-hardened layer, plenty of coolant.
Can 1.4460 be welded?
GTAW/GMAW/SMAW with over-alloyed filler (ER2209 / 25.9.4L), interpass max ~150 °C, moderate heat input to keep a balanced ferrite/austenite ratio; no post-weld stress relief in the 600–950 °C range — re-solution anneal and quench if possible.
Can 1.4460 be formed, bent or molded?
Cold forming needs roughly twice the force of 304 with large springback allowance; hot work at 1000–1150 °C followed by full solution anneal and water quench.
What surface finishes work on 1.4460?
Pickle and passivate (or electropolish) after welding to restore the passive film; grinds and polishes to a bright finish but is ferromagnetic, so magnetic-particle inspection and magnetic clamping both work.
1.4460 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 |
|---|---|---|
| Clow carbon to limit carbide precipitation | ≤ 0.05 | 0.03 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.04 | — |
| S | ≤ 0.02 | — |
| Cr | 25 – 28 | 26.5 |
| Ni | 4.5 – 6.5 | 5.5 |
| Mo | 1.3 – 2 | 1.7 |
| Nlow compared with 2205 (0.14–0.20) | 0.05 – 0.2 | 0.12 |
| Fe | balance | — |
1.4460 H+AT — frequently asked
What is 1.4460 H+AT used for?
1.4460 H+AT is typically used for pressure vessels, pump and valve components and chemical processing equipment. In short: higher-chromium first-generation duplex; AISI 329 equivalent; heavy-wall pressure grade.
What is the yield strength of 1.4460 H+AT?
1.4460 H+AT has a typical yield strength of 490 MPa (71.1 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 76% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4460 H+AT easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Machine like 2205 but tougher: rigid setups, sharp coated carbide, ~30–40 % lower cutting speed than 316L, heavy positive feed to cut under the work-hardened layer, plenty of coolant.
Can 1.4460 H+AT be welded?
Yes — weldability is rated good (55/100). GTAW/GMAW/SMAW with over-alloyed filler (ER2209 / 25.9.4L), interpass max ~150 °C, moderate heat input to keep a balanced ferrite/austenite ratio; no post-weld stress relief in the 600–950 °C range — re-solution anneal and quench if possible.
What surface finishes work on 1.4460 H+AT?
Pickle and passivate (or electropolish) after welding to restore the passive film; grinds and polishes to a bright finish but is ferromagnetic, so magnetic-particle inspection and magnetic clamping both work.
Can 1.4460 H+AT be formed, bent or molded?
Cold forming needs roughly twice the force of 304 with large springback allowance; hot work at 1000–1150 °C followed by full solution anneal and water quench.
What is the maximum service temperature of 1.4460 H+AT?
1.4460 H+AT is rated for continuous use to about 280°C (536 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4460-AT and 1.4460-AW?
AT is the default condition — standard delivery condition for plate, bar, forgings and tube — balanced 50/50 ferrite/austenite with best corrosion resistance and toughness. AW: condition of fabricated joints when re-solution annealing is impossible; expect lower HAZ toughness and reduced pitting resistance versus the parent plate. Yield strength is 500 MPa in AT versus 480 MPa in AW.
Sources
- EN 10088-1: Stainless steels — List of stainless steels — CEN (2014)
- EN 10088-2/-3: Stainless steel sheet/plate and semi-finished/bar products — CEN (2014)
- ASTM A240 / A276 (UNS S32900, type 329) — ASTM (2023)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- Duplex stainless steel data sheets (2205/329 family) — Outokumpu / Sandvik (2023)
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.