Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
PH 13-8Mo is a molybdenum- and aluminium-bearing martensitic precipitation-hardening (PH) stainless steel. This datasheet presents the material within the American (ASTM / ASME / AMS / UNS) standard system.
With about 13% chromium, 8% nickel, 2.2% molybdenum and 1% aluminium and very low carbon, manganese, silicon, phosphorus and sulphur, 13-8Mo offers the highest toughness and best stress-corrosion-cracking resistance of the common PH stainless steels, combined with very high strength and good transverse properties. It is typically double-vacuum-melted (VIM + VAR) for high cleanliness. The molybdenum addition improves pitting resistance relative to 15-5PH and 17-4PH. The alloy is martensitic in the solution-treated condition and is strengthened by a single low-temperature ageing treatment that precipitates a nickel-aluminium phase.
Typical applications include aerospace structural and landing-gear components, valve and pump parts, shafts, fasteners, and high-strength corrosion-resistant components requiring maximum toughness.
Typical values, H1000 condition.
| Property | Value | Unit |
|---|---|---|
| Density | 7.76 | g/cm³ |
| Melting range | 1400–1440 | °C |
| Elastic modulus | 203 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 10.6 | µm/m·°C |
| Thermal conductivity (20 °C) | 14.0 | W/m·K |
| Specific heat (20 °C) | 460 | J/kg·K |
| Structure | Martensitic (precipitation-hardening) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Iron | Fe | Balance | — | Base element |
| Chromium | Cr | 12.25 | 13.25 | Corrosion resistance; martensite former |
| Nickel | Ni | 7.5 | 8.5 | Toughness; martensite stability |
| Molybdenum | Mo | 2.0 | 2.5 | Pitting resistance; strength |
| Aluminium | Al | 0.90 | 1.35 | Precipitation-hardening phase (Ni-Al) |
| Manganese | Mn | — | 0.20 | Low (toughness) |
| Silicon | Si | — | 0.10 | Low (toughness) |
| Carbon | C | — | 0.05 | Low (toughness) |
| Phosphorus | P | — | 0.010 | Very low (toughness) |
| Sulphur | S | — | 0.008 | Very low (toughness) |
Typical values by ageing (H) condition, per ASTM A564 / AMS 5629 for UNS S13800.
| Condition | Tensile strength | 0.2% Yield | Hardness |
|---|---|---|---|
| H950 | ≥1520 MPa (220 ksi) | ≥1410 MPa (205 ksi) | ~47 HRC |
| H1000 | ≥1410 MPa (205 ksi) | ≥1310 MPa (190 ksi) | ~45 HRC |
| H1050 | ≥1340 MPa (195 ksi) | ≥1210 MPa (175 ksi) | ~43 HRC |
| H1100 | ≥1170 MPa (170 ksi) | ≥1070 MPa (155 ksi) | ~38 HRC |
Confirm against the mill test report. Elongation typically ≥10–14% depending on condition.
| Environment | Performance | Notes |
|---|---|---|
| Atmospheric / general | Good | Comparable to or better than 15-5PH |
| Chloride pitting | Moderate | Improved by molybdenum vs other PH grades |
| Stress-corrosion cracking | Very Good | Best SCC resistance of common PH grades |
| Mild acids | Good | At low concentrations |
| Seawater | Limited | Not recommended for prolonged exposure |
The molybdenum addition gives better pitting resistance than 15-5PH and 17-4PH; the high purity gives excellent toughness and SCC resistance.
A martensitic precipitation-hardening alloy; supplied in Condition A (solution-treated) and hardened by a single low-temperature ageing treatment.
Solution Treatment (Condition A) Approximately 925 °C followed by cooling to room temperature to form a martensitic structure.
Precipitation Hardening (Ageing) A single low-temperature ageing treatment precipitates a nickel-aluminium phase. The temperature sets the strength level: H950 (~510 °C) gives maximum strength; higher temperatures (H1000, H1050, H1100) progressively lower strength while increasing toughness. Air cool after ageing.
Weldable by common fusion methods; matching filler is used. A post-weld solution treatment and ageing restores full properties.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Matching 13-8-type filler |
| GMAW / MIG | Good | Matching filler |
| EBW / laser | Good | Autogenous or matching filler |
Weld in the solution-treated condition; re-age after welding to restore strength.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Condition A or over-aged for best machinability |
| Tooling | Carbide tooling; rigid setup |
| Coolant | Ample flood coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Limited in hardened conditions; form in Condition A |
| Hot forming | ~1150–950 °C; solution treat + age afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Aerospace | Landing gear, structural fittings, actuators | Maximum toughness + high strength |
| Defence | High-strength structural components | Strength + SCC resistance |
| Oil & gas | Valve and pump components, shafts | Strength + pitting resistance |
| General industrial | High-strength fasteners, gears | Hardness + toughness |
| Product Form | ASTM Standard | ASME / AMS |
|---|---|---|
| Bar, wire, forgings and extrusions | ASTM A564 grade XM-13 | ASME SA-564 / AMS 5629 |
| Plate, sheet and strip | ASTM A693 grade XM-13 | AMS 5864 |
| Forgings | ASTM A705 grade XM-13 | ASME SA-705 |
| Welding consumables | Matching 13-8-type filler | — |
Molybdenum- and aluminium-bearing martensitic precipitation-hardening stainless steel. UNS S13800.
| Grade | Cr % | Ni % | Mo % | Other | Best Used For |
|---|---|---|---|---|---|
| PH 13-8Mo | 12.25–13.25 | 7.5–8.5 | 2.0–2.5 | Al | Highest-toughness PH; aerospace, SCC resistance |
| 15-5PH | 14–15.5 | 3.5–5.5 | — | Cu, Nb | High-strength PH; transverse toughness |
| 17-4PH | 15–17.5 | 3–5 | — | Cu, Nb | General PH; high strength |
| 17-7PH | 16–18 | 6.5–7.75 | — | Al | Semi-austenitic PH; springs |
| Custom 465 | 11–12.5 | 10.75–11.25 | 0.75–1.25 | Ti | Ultra-high-strength PH |
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