Stainless Steel 1.4530 +P1200
Precip hard · default condition
EN 1.4530
+P1200 = 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.
Values for the +P1200 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 |
|---|---|---|---|---|---|---|
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 | — |
+P1200DefaultThis page 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 +P1200?
1.4530 +P1200 is 1.4530 in the +P1200 condition — standard delivered strength class: peak-aged for retaining rings, high-strength shafts and aerospace parts needing 1200 MPa plus good toughness. 1.4530 +P1200 has a yield strength of 1,200 MPa (174 ksi) and a tensile strength of 1,300 MPa (189 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 14% and the elastic modulus is 200 GPa (29 Msi). 1.4530 +P1200 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).
Advantages
- High strength — 1,200 MPa (174 ksi), better than 98% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
Limitations
- Limited ductility — 14%, worse than 91% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
1.4530 +P1200 properties
Typical room-temperature values for 1.4530 +P1200; 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 +P1200 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 +P1200 has a yield strength of 1,200 MPa (174 ksi) and a tensile strength of 1,300 MPa (189 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 14% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4530 +P1200 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 +P1200 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 62% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4530 +P1200 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 +P1200's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability good (65/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4530 +P1200
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 +P1200 — frequently asked
What is 1.4530 +P1200 used for?
1.4530 +P1200 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 +P1200?
1.4530 +P1200 has a typical yield strength of 1,200 MPa (174 ksi) and a tensile strength of 1,300 MPa (189 ksi) — stronger than 98% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4530 +P1200 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% 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 +P1200 be welded?
Yes — weldability is rated good (65/100). 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 +P1200?
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 +P1200 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 +P1200?
1.4530 +P1200 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.