Stainless Steel PH14-8Mo SRH950
Precip hard
UNS S14800 · ASTM A564 Type PH14-8Mo
SRH950 = austenite conditioning + sub-zero cooling + age 510 °C
Highest-strength standard heat-treated condition — choose for aerospace springs, fittings and fasteners needing ~1550 MPa UTS.
Values for the SRH950 condition
Other PH14-8Mo tempers and conditions
PH14-8Mo is listed in 4 conditions; see the grade overview at PH14-8Mo.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ADefault Solution annealed | As-supplied formable condition — choose for forming, machining and welding before the transformation/aging cycle. | 415 | 895 | 25 | 95 HRB | — |
Austenite conditioning + sub-zero cooling + age 565 °C | Slightly lower strength than SRH950 with better ductility, toughness and stress-corrosion resistance. | 1,310 | 1,420 | 10 | 43 HRC | — |
SRH950This page Austenite conditioning + sub-zero cooling + age 510 °C | Highest-strength standard heat-treated condition — choose for aerospace springs, fittings and fasteners needing ~1550 MPa UTS. | 1,450 | 1,585 | 8 | 46 HRC | — |
Cold rolled (≈60 %) from Condition A + age 482 °C | Maximum-strength thin strip condition for flat springs, diaphragms and shims where forming is done before aging. | 1,720 | 1,790 | 2 | 49 HRC | — |
What is PH14-8Mo SRH950?
PH14-8Mo SRH950 is PH14-8Mo in the SRH950 condition — highest-strength standard heat-treated condition — choose for aerospace springs, fittings and fasteners needing ~1550 MPa UTS. PH14-8Mo SRH950 has a yield strength of 1,450 MPa (210 ksi) and a tensile strength of 1,585 MPa (230 ksi) — stronger than 99% of stainless steel grades. Elongation at break is 8% and the elastic modulus is 200 GPa (29 Msi). PH14-8Mo SRH950 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). A is the default condition FabDigit quotes; SRH950 is available on request or by drawing note.
Advantages
- High strength — 1,450 MPa (210 ksi), better than 99% of stainless steel grades
Limitations
- Limited ductility — 8%, worse than 99% of stainless steel grades
- Limited formability — 15/100, worse than 91% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Difficult to weld — 35/100, worse than 86% of stainless steel grades
PH14-8Mo SRH950 properties
Typical room-temperature values for PH14-8Mo SRH950; 18 are specific to this condition. Other listed values are PH14-8Mo reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
PH14-8Mo SRH950 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).
Mechanical14
PH14-8Mo SRH950 has a yield strength of 1,450 MPa (210 ksi) and a tensile strength of 1,585 MPa (230 ksi) — stronger than 99% of stainless steel grades. Elongation at break is 8% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
PH14-8Mo SRH950 is rated for continuous service to 425°C (797 °F). It conducts heat at 15.9 W/m·K (9.19 BTU/hr·ft·°F), better than 55% of stainless steel grades. Thermal expansion is 11 µm/m·K (6.11 µin/in·°F).
Electrical3
PH14-8Mo SRH950 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (56/100), worse than 66% of stainless steel grades.
Sustainability4
Producing a kilogram of PH14-8Mo SRH950 takes about 58 MJ of energy and emits 4.6 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 30%.
Manufacturability7
PH14-8Mo SRH950's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability fair (35/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PH14-8Mo SRH950
Is PH14-8Mo easy to machine?
Machine in Condition A with rigid setups, positive-rake carbide and heavy feeds to avoid work-hardened glazing; after SRH/CH aging expect grinding or ceramic/CBN tooling and ~25–35 % of 1212 rates.
Can PH14-8Mo be welded?
GTAW/resistance welding in Condition A with matching or 17-7PH-type filler works well; the full conditioning + aging cycle must be re-applied after welding to restore properties, and heavy weld sections lose ductility.
Can PH14-8Mo be formed, bent or molded?
Form, draw and roll in Condition A (behaves like a mildly work-hardening austenitic), then transform and age; springback and cold-work-induced martensite must be allowed for in tooling.
What surface finishes work on PH14-8Mo?
Passivate per ASTM A967 or electropolish; the Al-bearing surface oxide should be removed by pickling before plating or brazing, and shot peening is common on aged springs.
PH14-8Mo 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 | ≤ 1 | 0.3 |
| Si | ≤ 1 | 0.3 |
| P | ≤ 0.02 | — |
| S | ≤ 0.01 | — |
| Cr | 13.75 – 15 | 14.4 |
| Ni | 7.75 – 8.75 | 8.2 |
| Mo | 2 – 3 | 2.5 |
| Alforms NiAl strengthening precipitates | 0.75 – 1.5 | 1.1 |
| N | ≤ 0.01 | — |
| Fe | balance | — |
PH14-8Mo SRH950 — frequently asked
What is PH14-8Mo SRH950 used for?
PH14-8Mo SRH950 is typically used for aerospace structural fasteners, springs, diaphragms and high-strength brackets. In short: stronger than 17-7PH; semi-austenitic PH sheet grade; forms soft, ages hard.
What is the yield strength of PH14-8Mo SRH950?
PH14-8Mo SRH950 has a typical yield strength of 1,450 MPa (210 ksi) and a tensile strength of 1,585 MPa (230 ksi) — stronger than 99% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is PH14-8Mo SRH950 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Machine in Condition A with rigid setups, positive-rake carbide and heavy feeds to avoid work-hardened glazing; after SRH/CH aging expect grinding or ceramic/CBN tooling and ~25–35 % of 1212 rates.
Can PH14-8Mo SRH950 be welded?
With care — weldability is rated fair (35/100). GTAW/resistance welding in Condition A with matching or 17-7PH-type filler works well; the full conditioning + aging cycle must be re-applied after welding to restore properties, and heavy weld sections lose ductility.
What surface finishes work on PH14-8Mo SRH950?
Passivate per ASTM A967 or electropolish; the Al-bearing surface oxide should be removed by pickling before plating or brazing, and shot peening is common on aged springs.
Can PH14-8Mo SRH950 be formed, bent or molded?
Form, draw and roll in Condition A (behaves like a mildly work-hardening austenitic), then transform and age; springback and cold-work-induced martensite must be allowed for in tooling.
What is the maximum service temperature of PH14-8Mo SRH950?
PH14-8Mo SRH950 is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between PH14-8Mo-A and PH14-8Mo-CH900?
A is the default condition — as-supplied formable condition — choose for forming, machining and welding before the transformation/aging cycle. CH900: maximum-strength thin strip condition for flat springs, diaphragms and shims where forming is done before aging. Yield strength is 415 MPa in A versus 1,720 MPa in CH900.
Sources
- ASTM A693 — Precipitation-Hardening Stainless Steel Plate, Sheet, and Strip — ASTM International (2023)
- ASTM A564/A564M — Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes — ASTM International (2019)
- AMS 5917 / AMS 5918 — PH14-8Mo sheet, strip and plate — SAE International (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- MMPDS-18 — Metallic Materials Properties Development and Standardization — Battelle/FAA (2023)
- PH14-8Mo semi-austenitic PH stainless product data — Cleveland-Cliffs (formerly 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.