Stainless Steel 1.4612 +AT (Solution annealed)
Heat-treated state
EN 1.4612
Delivery/intermediate condition for rough machining, forming and welding before precipitation hardening.
Values for the +AT condition
Other 1.4612 tempers and conditions
1.4612 is listed in 3 conditions; see the grade overview at 1.4612.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+ATThis page Solution annealed | Delivery/intermediate condition for rough machining, forming and welding before precipitation hardening. | 750 | 950 | 16 | 30 HRC | — |
+P1510Default Precipitation hardened, Rm ≥ 1510 MPa | Standard high-strength ageing condition: best compromise of ~1500–1700 MPa strength with usable toughness and ductility. | 1,450 | 1,580 | 11 | 46 HRC | — |
Precipitation hardened, Rm ≥ 1650 MPa | Peak-strength ageing for the most heavily stressed rings/shafts; accept lower toughness and higher SCC/hydrogen sensitivity. | 1,580 | 1,720 | 9 | 50 HRC | — |
What is 1.4612 +AT?
1.4612 +AT is 1.4612 heat treated to +AT — delivery/intermediate condition for rough machining, forming and welding before precipitation hardening. 1.4612 +AT has a yield strength of 750 MPa (109 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 93% of stainless steel grades. Elongation at break is 16% and the elastic modulus is 200 GPa (29 Msi). 1.4612 +AT has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F). +P1510 is the default condition FabDigit quotes; +AT is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 85/100, better than 97% of stainless steel grades
- High strength — 750 MPa (109 ksi), better than 93% of stainless steel grades
Limitations
- Limited ductility — 16%, worse than 88% of stainless steel grades
- Limited service temperature — 350°C (662 °F), worse than 84% of stainless steel grades
1.4612 +AT properties
Typical room-temperature values for 1.4612 +AT; 19 are specific to this condition. Other listed values are 1.4612 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4612 +AT has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
1.4612 +AT has a yield strength of 750 MPa (109 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 93% of stainless steel grades. Elongation at break is 16% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4612 +AT is rated for continuous service to 350°C (662 °F). It conducts heat at 17 W/m·K (9.82 BTU/hr·ft·°F), better than 71% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
1.4612 +AT conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4612 +AT takes about 58 MJ of energy and emits 4.8 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 25%.
Manufacturability8
1.4612 +AT's machinability is fair (40/100, better than 72% of stainless steel grades); weldability good (60/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4612 +AT
Is 1.4612 easy to machine?
Rough machine in +AT (≈30 HRC) and leave finish stock; in +P conditions use rigid setups, coated carbide, low speed/high feed and flood coolant — work hardens and burnishes readily.
Can 1.4612 be welded?
Weld only in the solution-annealed condition with matching low-C filler under clean/inert conditions, then re-solution and re-age; welding in the aged state locally overages the HAZ.
Can 1.4612 be formed, bent or molded?
Hot forge/roll well above ~1000 °C and cool controlled; cold forming is limited to light straightening and only in +AT.
What surface finishes work on 1.4612?
Passivate per ASTM A967 after machining; grinding/polishing gives a fine surface, and thin dense chrome or nitriding can be used where wear resistance is needed — no anodizing.
1.4612 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, VIM/VAR melted | ≤ 0.01 | 0.01 |
| Si | ≤ 0.1 | 0.05 |
| Mn | ≤ 0.1 | 0.05 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.01 | 0 |
| Cr | 11 – 12.5 | 11.8 |
| Nihighest Ni of the 12Cr-Ni-Mo-Al-Ti series | 10 – 11.5 | 11 |
| Mo | 1.5 – 2 | 1.8 |
| TiNi3Ti precipitation hardener | 0.5 – 1.4 | 0.9 |
| AlNiAl precipitation hardener | 0.2 – 0.8 | 0.4 |
| Fe | balance | — |
1.4612 +AT — frequently asked
What is 1.4612 +AT used for?
1.4612 +AT is typically used for large turbogenerator retaining rings, rotor forgings, non-magnetic rotor rings, high-strength shafts and pins and heavily loaded clamping rings. In short: highest-strength retaining ring; 1580 MPa tensile; non-magnetic when aged.
What is the yield strength of 1.4612 +AT?
1.4612 +AT has a typical yield strength of 750 MPa (109 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 93% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4612 +AT easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% of stainless steel grades). Rough machine in +AT (≈30 HRC) and leave finish stock; in +P conditions use rigid setups, coated carbide, low speed/high feed and flood coolant — work hardens and burnishes readily.
Can 1.4612 +AT be welded?
Yes — weldability is rated good (60/100). Weld only in the solution-annealed condition with matching low-C filler under clean/inert conditions, then re-solution and re-age; welding in the aged state locally overages the HAZ.
What surface finishes work on 1.4612 +AT?
Passivate per ASTM A967 after machining; grinding/polishing gives a fine surface, and thin dense chrome or nitriding can be used where wear resistance is needed — no anodizing.
Can 1.4612 +AT be formed, bent or molded?
Hot forge/roll well above ~1000 °C and cool controlled; cold forming is limited to light straightening and only in +AT.
What is the maximum service temperature of 1.4612 +AT?
1.4612 +AT is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10088-3 Stainless steels — Technical delivery conditions for semi-finished products, bars, rods — CEN (2014)
- EN 10088-1 Stainless steels — List of stainless steels (physical properties) — CEN (2014)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (PH stainless steels) — ASM International (1990)
- ASTM A564/A564M — Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars (UNS S13800 comparison) — ASTM (2019)
- Maraging-type 12Cr-Ni-Mo-Al-Ti stainless forging grades (comparative producer data) — Special steel producers (e.g. Böhler/voestalpine, Aubert & Duval) (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.