Stainless Steel 13-8 PH-H1150M
Precip hard
AISI/SAE 13-8 PH · UNS S13800 · ASTM XM-13 · EN 1.4534
H1150M = double overaged 760 °C + 621 °C
Rarely stocked softest aged state used where maximum ductility, notch toughness and SCC immunity are required.
Values for the H1150M condition
Other 13-8 PH tempers and conditions
13-8 PH is listed in 8 conditions; see the grade overview at 13-8 PH.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
H1150MThis page Double overaged 760 °C + 621 °C | Rarely stocked softest aged state used where maximum ductility, notch toughness and SCC immunity are required. | 725 | 900 | 22 | 28 HRC | 1.9 % IACS |
Condition ADefault solution annealed (~927 °C, air cooled) | As-supplied stock condition for machining, forming and welding before precipitation aging. | 827 | 1,000 | 13 | 33 HRC | — |
Overaged 621 °C (1150 °F) for 4 h, maximum toughness | Maximum-toughness, best SCC-resistant temper; choose for corrosive service or heavy sections where 1035 MPa suffices. | 930 | 1,035 | 18 | 32 HRC | — |
Aged 593 °C (1100 °F) for 4 h | Overaged temper giving high toughness at ~1170 MPa UTS for thick, fracture-critical sections. | 1,070 | 1,170 | 16 | 35 HRC | — |
Aged 4 h at 566 °C (1050 °F), air cooled | Preferred when good SCC resistance and toughness matter more than the last 10 % of strength. | 1,210 | 1,310 | 15 | 40 HRC | — |
Aged 552 °C (1025 °F) for 4 h | Intermediate temper when slightly lower strength buys extra ductility and SCC margin over H1000. | 1,310 | 1,415 | 14 | 43 HRC | — |
Aged 4 h at 538 °C (1000 °F), air cooled | Most widely specified aerospace condition — near-peak strength with markedly better toughness than H950. | 1,415 | 1,520 | 13 | 45 HRC | — |
Aged 4 h at 510 °C (950 °F), air cooled | Peak-strength condition for maximum load capacity; least tolerant of corrosive or hydrogen-bearing environments. | 1,520 | 1,620 | 12 | 46 HRC | — |
What is 13-8 PH-H1150M?
13-8 PH-H1150M is 13-8 PH in the H1150M condition — rarely stocked softest aged state used where maximum ductility, notch toughness and SCC immunity are required. 13-8 PH-H1150M has a yield strength of 725 MPa (105 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 93% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi). 13-8 PH-H1150M has a density of 7.76 g/cm³ (0.28 lb/in³), lighter than 58% of stainless steel grades. It melts at 1,400°C (2,552 °F). Condition A is the default condition FabDigit quotes; H1150M is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 210 MPa·√m (191.1 ksi·√in), better than 95% of stainless steel grades
- High strength — 725 MPa (105 ksi), better than 93% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
Limitations
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
13-8 PH-H1150M properties
Typical room-temperature values for 13-8 PH-H1150M; 22 are specific to this condition. Other listed values are 13-8 PH reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
13-8 PH-H1150M has a density of 7.76 g/cm³ (0.28 lb/in³), lighter than 58% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
13-8 PH-H1150M has a yield strength of 725 MPa (105 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 93% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
13-8 PH-H1150M is rated for continuous service to 480°C (896 °F). It conducts heat at 15.5 W/m·K (8.96 BTU/hr·ft·°F), better than 53% of stainless steel grades. Thermal expansion is 10.6 µm/m·K (5.89 µin/in·°F).
Electrical3
13-8 PH-H1150M conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (61/100), worse than 56% of stainless steel grades.
Sustainability4
Producing a kilogram of 13-8 PH-H1150M takes about 62 MJ of energy and emits 5.2 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 30%.
Manufacturability8
13-8 PH-H1150M's machinability is fair (36/100, better than 57% of stainless steel grades); weldability good (66/100); formability fair (36/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 13-8 PH-H1150M
Is 13-8 PH easy to machine?
Machine in Condition A with rigid setups, sharp carbide, positive rake and heavy coolant (~30 % of 1212); aged H950–H1000 work-hardens and needs reduced speeds and low feeds to avoid glazing.
Can 13-8 PH be welded?
Very good GTAW/EBW/laser weldability with matching or 13-8/15-5 filler, no preheat needed; weld in Condition A then re-solution + age (or age only) to restore joint strength.
Can 13-8 PH be formed, bent or molded?
Cold formability is limited even in Condition A — use generous bend radii; hot work 1040–1180 °C followed by solution anneal at ~927 °C and air cool.
What surface finishes work on 13-8 PH?
Passivate per AMS 2700/ASTM A967 after machining; takes a fine polish and can be electropolished, shot-peened or thin-dense-chrome plated — bake after any plating to avoid hydrogen embrittlement.
13-8 PH 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 | ≤ 0.05 | 0.03 |
| Mn | ≤ 0.2 | 0.05 |
| Si | ≤ 0.1 | 0.05 |
| P | ≤ 0.01 | 0.01 |
| S | ≤ 0.01 | 0 |
| Cr | 12.25 – 13.25 | 12.7 |
| Ni | 7.5 – 8.5 | 8 |
| Mo | 2 – 2.5 | 2.25 |
| AlNiAl precipitate former | 0.9 – 1.35 | 1.1 |
| N | ≤ 0.01 | 0.01 |
| Febalance, ~74–76 % | balance |
13-8 PH-H1150M — frequently asked
What is 13-8 PH-H1150M used for?
13-8 PH-H1150M is typically used for aircraft landing gear components, actuator rods and shafts, aerospace fasteners, high-strength structural fittings, mould and die inserts and valve components. In short: ultra-high strength stainless.
What is the yield strength of 13-8 PH-H1150M?
13-8 PH-H1150M has a typical yield strength of 725 MPa (105 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 93% of stainless steel grades. Strength varies by condition: see the 8 listed tempers.
Is 13-8 PH-H1150M easy to machine?
Not especially — machinability is rated fair (36/100, better than 57% of stainless steel grades). Machine in Condition A with rigid setups, sharp carbide, positive rake and heavy coolant (~30 % of 1212); aged H950–H1000 work-hardens and needs reduced speeds and low feeds to avoid glazing.
Can 13-8 PH-H1150M be welded?
Yes — weldability is rated good (66/100). Very good GTAW/EBW/laser weldability with matching or 13-8/15-5 filler, no preheat needed; weld in Condition A then re-solution + age (or age only) to restore joint strength.
What surface finishes work on 13-8 PH-H1150M?
Passivate per AMS 2700/ASTM A967 after machining; takes a fine polish and can be electropolished, shot-peened or thin-dense-chrome plated — bake after any plating to avoid hydrogen embrittlement.
Can 13-8 PH-H1150M be formed, bent or molded?
Cold formability is limited even in Condition A — use generous bend radii; hot work 1040–1180 °C followed by solution anneal at ~927 °C and air cool.
What is the maximum service temperature of 13-8 PH-H1150M?
13-8 PH-H1150M is rated for continuous use to about 480°C (896 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 13-8 PH Condition A and 13-8 PH-H950?
Condition A is the default condition — as-supplied stock condition for machining, forming and welding before precipitation aging. H950: peak-strength condition for maximum load capacity; least tolerant of corrosive or hydrogen-bearing environments. Yield strength is 827 MPa in Condition A versus 1,520 MPa in H950.
Can FabDigit make parts in 13-8 PH-H1150M?
Yes — 13-8 PH-H1150M is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A564/A564M — Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars (Type XM-13) — ASTM International (2019)
- AMS 5629 / AMS 5934 — 13Cr-8Ni-2.2Mo-1.1Al bar, forgings and rings — SAE International (2018)
- EN 10088-3 / X3CrNiMoAl13-8-2 (1.4534) — CEN (2014)
- PH13-8Mo / 13-8 Stainless technical datasheet — Carpenter Technology / Cleveland-Cliffs (AK Steel) (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- MMPDS-2022 — Metallic Materials Properties Development and Standardization (PH13-8Mo) — Battelle/FAA (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.