Stainless Steel PH14-8Mo
UNS S14800 · ASTM A564 Type PH14-8Mo
A semi-austenitic precipitation-hardening stainless with molybdenum addition for improved strength and toughness after aging, used where higher strength than 17-7PH is needed with good corrosion resistance.
Reference datasheet — PH14-8Mo is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the A condition
PH14-8Mo tempers and conditions
PH14-8Mo is supplied in 4 conditions, soft to hard. A is the default FabDigit quotes; the values on this page are for it.
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 | — |
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?
A semi-austenitic precipitation-hardening stainless with molybdenum addition for improved strength and toughness after aging, used where higher strength than 17-7PH is needed with good corrosion resistance. PH14-8Mo 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). PH14-8Mo has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 895 MPa (130 ksi) — stronger than 62% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
What is PH14-8Mo used for?
- aerospace structural fasteners
- springs
- diaphragms
- high-strength brackets
Advantages
- Forms and bends easily — 70/100, better than 79% of stainless steel grades
Limitations
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
PH14-8Mo properties
Typical room-temperature values for PH14-8Mo-A; bars are the position among stainless steel grades.
Physical3
PH14-8Mo 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 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 895 MPa (130 ksi) — stronger than 62% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
PH14-8Mo is rated for continuous service to 400°C (752 °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 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of PH14-8Mo 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's machinability is fair (40/100, better than 72% of stainless steel grades); weldability good (60/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. PH14-8Mo is highlighted; hover a dot for its name, or open the interactive family chart.
Working with PH14-8Mo
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.
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 |
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.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel PH14-8Mo in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S14800
- ASTM
- A564 Type PH14-8Mo
How much does PH14-8Mo cost?
PH14-8Mo is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
PH14-8Mo — frequently asked
What is PH14-8Mo used for?
PH14-8Mo 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?
PH14-8Mo has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 895 MPa (130 ksi) — stronger than 62% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is PH14-8Mo easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% 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 be welded?
Yes — weldability is rated good (60/100). 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?
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 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?
PH14-8Mo 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 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.
How much does PH14-8Mo cost?
PH14-8Mo is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.