Stainless Steel 1.4606 +AT (Solution annealed)
Heat-treated state
EN 1.4606
Soft supply condition for machining, cold forming or forging before the customer ages the part.
Values for the +AT condition
Other 1.4606 tempers and conditions
1.4606 is listed in 4 conditions; see the grade overview at 1.4606.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+ATThis page Solution annealed | Soft supply condition for machining, cold forming or forging before the customer ages the part. | 300 | 690 | 45 | 180 HB | — |
Solution treated ~965–985 °C + precipitation hardened ~720 °C/16 h | Coarser-grain creep-optimised condition for long-term service above ~600 °C (turbine discs, hot bolting) at slightly lower RT strength. | 640 | 960 | 22 | 30 HRC | — |
+P880Default Solution treated ~880–900 °C + precipitation hardened ~720 °C/16 h | Standard high-strength condition for bolts, studs and rotating parts up to ~650 °C where room-temperature yield and fatigue matter most. | 700 | 1,010 | 20 | 32 HRC | — |
Cold drawn/cold worked, then precipitation hardened | Fastener wire and small bar where extra cold work before ageing raises strength beyond the standard aged level. | 950 | 1,200 | 12 | 38 HRC | — |
What is 1.4606 +AT?
1.4606 +AT is 1.4606 heat treated to +AT — soft supply condition for machining, cold forming or forging before the customer ages the part. 1.4606 +AT has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 201 GPa (29.2 Msi). 1.4606 +AT has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,370°C (2,498 °F). +P880 is the default condition FabDigit quotes; +AT is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- High embodied carbon — 6.5 kg CO₂/kg, worse than 93% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
1.4606 +AT properties
Typical room-temperature values for 1.4606 +AT; 17 are specific to this condition. Other listed values are 1.4606 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4606 +AT has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
1.4606 +AT has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 201 GPa (29.2 Msi).
Thermal6
1.4606 +AT is rated for continuous service to 650°C (1,202 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 16.4 µm/m·K (9.11 µin/in·°F).
Electrical3
1.4606 +AT conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4606 +AT takes about 100 MJ of energy and emits 6.5 kg of CO₂ — more than 98% of stainless steel grades. Typical recycled content is 30%.
Manufacturability7
1.4606 +AT's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability good (60/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4606 +AT
Is 1.4606 easy to machine?
Machine preferably in +AT condition with rigid setups, positive-rake carbide or ceramic tools, heavy constant feed and flood coolant; the alloy work-hardens fast and rubbing/dwell instantly glazes the surface.
Can 1.4606 be welded?
GTAW/EBW with matching A-286 filler in the solution-annealed state, low heat input and no preheat; re-solution + re-age after welding to avoid strain-age (HAZ) cracking in thick or restrained joints.
Can 1.4606 be formed, bent or molded?
Hot work 1090–980 °C then water quench; cold forming (thread rolling, heading) only in the +AT condition with high forming loads and interstage anneals — aged material is essentially non-formable.
What surface finishes work on 1.4606?
Passivate per ASTM A967 after machining; grinding/electropolishing gives a bright finish, and silver, MoS2 or Cd-free dry-film coatings are used on fasteners to stop galling at temperature.
1.4606 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 |
|---|---|---|
| C | 0.03 – 0.08 | 0.05 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.03 | — |
| S | ≤ 0.02 | — |
| Cr | 13.5 – 16 | 14.8 |
| Ni | 24 – 27 | 25.5 |
| Mo | 1 – 1.5 | 1.25 |
| Tiγ′ (Ni3(Ti,Al)) former | 1.9 – 2.35 | 2.1 |
| V | 0.1 – 0.5 | 0.3 |
| Al | ≤ 0.35 | 0.2 |
| Bgrain-boundary strengthening | 0 – 0.01 | 0.01 |
| Febalance ≈ 53 % | balance | — |
1.4606 +AT — frequently asked
What is 1.4606 +AT used for?
1.4606 +AT is typically used for turbine fasteners, gas turbine hardware and high-temperature bolting. In short: austenitic PH, 650 °C; creep-resistant fastener alloy; non-magnetic when aged.
What is the yield strength of 1.4606 +AT?
1.4606 +AT has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 68% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4606 +AT easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Machine preferably in +AT condition with rigid setups, positive-rake carbide or ceramic tools, heavy constant feed and flood coolant; the alloy work-hardens fast and rubbing/dwell instantly glazes the surface.
Can 1.4606 +AT be welded?
Yes — weldability is rated good (60/100). GTAW/EBW with matching A-286 filler in the solution-annealed state, low heat input and no preheat; re-solution + re-age after welding to avoid strain-age (HAZ) cracking in thick or restrained joints.
What surface finishes work on 1.4606 +AT?
Passivate per ASTM A967 after machining; grinding/electropolishing gives a bright finish, and silver, MoS2 or Cd-free dry-film coatings are used on fasteners to stop galling at temperature.
Can 1.4606 +AT be formed, bent or molded?
Hot work 1090–980 °C then water quench; cold forming (thread rolling, heading) only in the +AT condition with high forming loads and interstage anneals — aged material is essentially non-formable.
What is the maximum service temperature of 1.4606 +AT?
1.4606 +AT is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10269 — Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties (X5NiCrTiMoVB25-15-2) — CEN (2013)
- ASTM A453/A453M Grade 660 — Bolting with Expansion Coefficients Comparable to Austenitic Stainless Steels — ASTM (2021)
- AMS 5737 / AMS 5525 — Alloy A-286 bars and sheet — SAE International (2019)
- ASM Specialty Handbook: Heat-Resistant Materials — ASM International (1997)
- MMPDS — Metallic Materials Properties Development and Standardization, A-286 chapter — Battelle/FAA (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.