Stainless Steel PH 13-8 Mo · precip hard
Stainless Steel PH 13-8 Mo-H950
Properties of the H950 condition, compared with the other PH 13-8 Mo tempers.
Choose ageing 4 h at 510 °C for the highest strength and hardness, as in landing-gear pins and high-strength fasteners, accepting the lowest toughness and SCC resistance.
What is PH 13-8 Mo-H950?
PH 13-8 Mo-H950 is PH 13-8 Mo in the H950 condition — choose ageing 4 h at 510 °C for the highest strength and hardness, as in landing-gear pins and high-strength fasteners, accepting the lowest toughness and SCC resistance. PH 13-8 Mo-H950 has a yield strength of 1,480 MPa (215 ksi) and a tensile strength of 1,590 MPa (231 ksi) — stronger than 100% of stainless steel grades. Elongation at break is 12% and the elastic modulus is 203 GPa (29.4 Msi). PH 13-8 Mo-H950 has a density of 7.76 g/cm³ (0.28 lb/in³), lighter than 59% of stainless steel grades. It melts at 1,400°C (2,552 °F). Condition A is the default condition FabDigit quotes; H950 is available on request or by drawing note.
Advantages
- High strength — 1,480 MPa (215 ksi), better than 100% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
Limitations
- Limited ductility — 12%, worse than 95% of stainless steel grades
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Needs corrosion protection — 50/100, worse than 79% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
PH 13-8 Mo-H950 properties
Typical room-temperature values for PH 13-8 Mo-H950 — 15 properties are specific to this condition; the rest are grade-level values shared by every PH 13-8 Mo temper. Each bar shows where the value sits among the stainless steel grades in FabDigit's library — further right is higher.
Physical3
PH 13-8 Mo-H950 has a density of 7.76 g/cm³ (0.28 lb/in³), lighter than 59% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical14
PH 13-8 Mo-H950 has a yield strength of 1,480 MPa (215 ksi) and a tensile strength of 1,590 MPa (231 ksi) — stronger than 100% of stainless steel grades. Elongation at break is 12% and the elastic modulus is 203 GPa (29.4 Msi).
Thermal5
PH 13-8 Mo-H950 is rated for continuous service to 400°C (752 °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 10.6 µm/m·K (5.89 µin/in·°F).
Electrical3
PH 13-8 Mo-H950 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 79% of stainless steel grades.
Sustainability4
Producing a kilogram of PH 13-8 Mo-H950 takes about 62 MJ of energy and emits 4.8 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 30%.
Manufacturability7
PH 13-8 Mo-H950's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability good (60/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other PH 13-8 Mo tempers and conditions
PH 13-8 Mo is also supplied in 7 other conditions. The full side-by-side table is on the PH 13-8 Mo overview.
- Condition ADefaultPick the solution annealed stock (~830 °C, air or oil cooled) for rough machining, forming and welding, then apply a single ageing treatment to reach final strength.800 MPa yield · 33 HRC
- H950Choose ageing 4 h at 510 °C for the highest strength and hardness, as in landing-gear pins and high-strength fasteners, accepting the lowest toughness and SCC resistance.1,480 MPa yield · 47 HRC
- H1000Use ageing 4 h at 540 °C as the common strength-toughness compromise at 1380 MPa yield; this is the most typical delivered aged state for aerospace structural parts.1,380 MPa yield · 45 HRC
- H1025Pick ageing 4 h at 552 °C when slightly lower strength of 1310 MPa yield buys better ductility and improved resistance to stress-corrosion cracking.1,310 MPa yield · 43 HRC
- H1050Choose the 4 h age at 566 °C (1050 °F), air cooled, when 1240 MPa yield must be combined with good stress-corrosion resistance for high-strength parts in corrosive service.1,240 MPa yield · 42 HRC
- H1100Age 4 h at 593 °C (1100 °F) and air cool for thick sections that need high fracture toughness; yield drops to 1105 MPa but elongation reaches 16% and service temperature rises to 480 °C.1,105 MPa yield · 37 HRC
- H1150Pick the softest single-step age (4 h at 621 °C / 1150 °F) for corrosive or hydrogen environments: 965 MPa yield with 18% elongation and the best toughness and SCC resistance.965 MPa yield · 33 HRC
- H1150MUse the 760 °C/2 h + 621 °C/4 h double age when maximum toughness and stress-corrosion cracking resistance in marine or hydrogen service outweigh the drop to 655 MPa yield.655 MPa yield · 28 HRC
Working with PH 13-8 Mo-H950
Is PH 13-8 Mo easy to machine?
Roughing is easiest in Condition A or the H1150 temper; aged tempers (H950–H1025) need rigid machines, low speed with steady heavier feed, sharp coated carbide and ample coolant. Expect cutting rates around 20–30 % of AISI 1212.
Can PH 13-8 Mo be welded?
GTAW and EBW weldability is good, usually autogenous or with matching filler. Weld in Condition A and re-solution treat plus age the whole part to restore strength; keep heat input low to limit delta ferrite and softened zones.
Can PH 13-8 Mo be formed, bent or molded?
Only limited cold forming in Condition A, with large springback and a low n-value. Hot form complex shapes and re-solution treat afterwards; aged material is effectively non-formable.
What surface finishes work on PH 13-8 Mo?
Polishes to a mirror finish because of the clean VIM melting practice. Passivation is the standard protection; chrome or cadmium plating is possible but requires a 190 °C hydrogen bake after plating to avoid embrittlement.
PH 13-8 Mo 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 |
| Slow sulfur to ensure transverse toughness | ≤ 0.01 | 0 |
| Cr | 12.25 – 13.25 | 12.7 |
| Ni | 7.5 – 8.5 | 8 |
| Mo | 2 – 2.5 | 2.25 |
| Alforms NiAl strengthening phase | 0.9 – 1.35 | 1.1 |
| N | ≤ 0.01 | 0.01 |
| Fe | balance | — |
PH 13-8 Mo-H950 — frequently asked
What is PH 13-8 Mo-H950 used for?
PH 13-8 Mo-H950 is typically used for aerospace landing gear components, high-strength aerospace fasteners, airframe structural fittings, shafts and actuator rods, valve and pump components and nuclear and petrochemical hardware. In short: aerospace high-strength PH.
What is the yield strength of PH 13-8 Mo-H950?
PH 13-8 Mo-H950 has a typical yield strength of 1,480 MPa (215 ksi) and a tensile strength of 1,590 MPa (231 ksi) — stronger than 100% of stainless steel grades. Strength varies by condition: see the 8 listed tempers.
Is PH 13-8 Mo-H950 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Roughing is easiest in Condition A or the H1150 temper; aged tempers (H950–H1025) need rigid machines, low speed with steady heavier feed, sharp coated carbide and ample coolant. Expect cutting rates around 20–30 % of AISI 1212.
Can PH 13-8 Mo-H950 be welded?
Yes — weldability is rated good (60/100). GTAW and EBW weldability is good, usually autogenous or with matching filler. Weld in Condition A and re-solution treat plus age the whole part to restore strength; keep heat input low to limit delta ferrite and softened zones.
What surface finishes work on PH 13-8 Mo-H950?
Polishes to a mirror finish because of the clean VIM melting practice. Passivation is the standard protection; chrome or cadmium plating is possible but requires a 190 °C hydrogen bake after plating to avoid embrittlement.
Can PH 13-8 Mo-H950 be formed, bent or molded?
Only limited cold forming in Condition A, with large springback and a low n-value. Hot form complex shapes and re-solution treat afterwards; aged material is effectively non-formable.
What is the maximum service temperature of PH 13-8 Mo-H950?
PH 13-8 Mo-H950 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.
What is the difference between PH 13-8 Mo Condition A and PH 13-8 Mo-H950?
Condition A is the default condition — pick the solution annealed stock (~830 °C, air or oil cooled) for rough machining, forming and welding, then apply a single ageing treatment to reach final strength. H950: choose ageing 4 h at 510 °C for the highest strength and hardness, as in landing-gear pins and high-strength fasteners, accepting the lowest toughness and SCC resistance. Yield strength is 800 MPa in Condition A versus 1,480 MPa in H950.
Can FabDigit make parts in PH 13-8 Mo-H950?
Yes — PH 13-8 Mo-H950 is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A564/A564M — Type XM-13 (UNS S13800) — ASTM (2019)
- AMS 5629 — Steel Bars, Forgings, 13Cr-8.0Ni-2.2Mo-1.1Al, Premium Quality — SAE International (2018)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels — ASM International (1990)
- MMPDS — Metallic Materials Properties Development and Standardization (PH13-8Mo) — Battelle/FAA (2023)
- PH13-8Mo / Custom 465-class PH stainless technical data — Carpenter Technology / AK Steel (2021)
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.