Stainless Steel 1.4530 +AT (Solution annealed)
Heat-treated state
EN 1.4530
Supply/machining condition: soft enough for heavy machining, forming and welding before the customer's ageing cycle.
Values for the +AT condition
Other 1.4530 tempers and conditions
1.4530 is listed in 3 conditions; see the grade overview at 1.4530.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+ATThis page Solution annealed | Supply/machining condition: soft enough for heavy machining, forming and welding before the customer's ageing cycle. | 750 | 950 | 18 | 30 HRC | — |
Over-aged (ageing ~560–600 °C) for maximum toughness | Pick when impact toughness, K_IC and stress-corrosion resistance matter more than peak strength (thick sections, sour or marine service). | 960 | 1,080 | 17 | 35 HRC | — |
+P1200Default Precipitation hardened, ageing ~510–540 °C | Standard delivered strength class: peak-aged for retaining rings, high-strength shafts and aerospace parts needing 1200 MPa plus good toughness. | 1,200 | 1,300 | 14 | 41 HRC | — |
What is 1.4530 +AT?
1.4530 +AT is 1.4530 heat treated to +AT — supply/machining condition: soft enough for heavy machining, forming and welding before the customer's ageing cycle. 1.4530 +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 18% and the elastic modulus is 200 GPa (29 Msi). 1.4530 +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). +P1200 is the default condition FabDigit quotes; +AT is available on request or by drawing note.
Advantages
- High strength — 750 MPa (109 ksi), better than 93% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
Limitations
- Limited ductility — 18%, worse than 83% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
1.4530 +AT properties
Typical room-temperature values for 1.4530 +AT; 19 are specific to this condition. Other listed values are 1.4530 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4530 +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
1.4530 +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 18% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4530 +AT is rated for continuous service to 400°C (752 °F). It conducts heat at 16.5 W/m·K (9.53 BTU/hr·ft·°F), better than 70% of stainless steel grades. Thermal expansion is 10.6 µm/m·K (5.89 µin/in·°F).
Electrical3
1.4530 +AT conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4530 +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%.
Manufacturability7
1.4530 +AT's machinability is fair (40/100, better than 72% of stainless steel grades); weldability very good (75/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4530 +AT
Is 1.4530 easy to machine?
Machine in the +AT condition with sharp, rigid setups, positive-rake carbide, low speed/high feed and flood coolant; aged material at ~41 HRC cuts like a Q&T tool steel and work-hardens if the tool rubs.
Can 1.4530 be welded?
Very low carbon makes it readily GTAW/EB/laser weldable with matching or maraging filler, no preheat needed; re-solution treat plus age (or at least re-age) after welding to restore joint strength.
Can 1.4530 be formed, bent or molded?
Cold forming and straightening are done in the soft solution-treated state; after ageing the alloy has little ductility reserve, so bending or coining of finished parts should be avoided.
What surface finishes work on 1.4530?
Passivate per ASTM A967 (citric or nitric) or electropolish for a bright, low-inclusion surface; avoid electroplating or cathodic protection without post-plating bake because of hydrogen embrittlement risk.
1.4530 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 | ≤ 0.03 | 0.02 |
| Si | ≤ 0.5 | 0.2 |
| Mn | ≤ 0.5 | 0.2 |
| P | ≤ 0.03 | — |
| S | ≤ 0.01 | — |
| Cr | 11 – 12.5 | 12 |
| Ni | 8.5 – 9.5 | 9 |
| Mo | 1.5 – 2.2 | 2 |
| AlNiAl precipitation | 0.15 – 0.5 | 0.3 |
| TiNi3Ti precipitation | 0.15 – 0.5 | 0.3 |
| Fe | balance | — |
1.4530 +AT — frequently asked
What is 1.4530 +AT used for?
1.4530 +AT is typically used for generator retaining rings, high-strength rotor components, turbine hardware and aerospace fasteners. In short: maraging-type PH stainless; 1200 MPa yield strength; retaining-ring alloy.
What is the yield strength of 1.4530 +AT?
1.4530 +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 1.4530 +AT easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% of stainless steel grades). Machine in the +AT condition with sharp, rigid setups, positive-rake carbide, low speed/high feed and flood coolant; aged material at ~41 HRC cuts like a Q&T tool steel and work-hardens if the tool rubs.
Can 1.4530 +AT be welded?
Yes — weldability is rated very good (75/100). Very low carbon makes it readily GTAW/EB/laser weldable with matching or maraging filler, no preheat needed; re-solution treat plus age (or at least re-age) after welding to restore joint strength.
What surface finishes work on 1.4530 +AT?
Passivate per ASTM A967 (citric or nitric) or electropolish for a bright, low-inclusion surface; avoid electroplating or cathodic protection without post-plating bake because of hydrogen embrittlement risk.
Can 1.4530 +AT be formed, bent or molded?
Cold forming and straightening are done in the soft solution-treated state; after ageing the alloy has little ductility reserve, so bending or coining of finished parts should be avoided.
What is the maximum service temperature of 1.4530 +AT?
1.4530 +AT is rated for continuous use to about 400°C (752 °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, wire, sections — CEN (2014)
- EN 10088-1 Stainless steels — List of stainless steels (physical property data) — CEN (2014)
- Marval X12 (X1CrNiMoAlTi12-9-2 / 1.4530) maraging stainless bar datasheet — Aubert & Duval (2020)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys (PH stainless steels) — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (stainless steels) — 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.