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
X8CrNiMoAl15-7-2 is a chromium-nickel-molybdenum-aluminium semi-austenitic precipitation-hardening (PH) stainless steel. This datasheet presents the material within the Werkstoff-Nummer (DIN / EN) designation system.
With about 15% chromium, 7% nickel, 2.5% molybdenum and 1% aluminium, 1.4532 is essentially the X7CrNiAl17-7 composition with about 2% molybdenum substituted for chromium, giving higher room- and elevated-temperature strength and improved corrosion resistance. It is supplied in the soft austenitic condition, formed, then transformed to martensite and precipitation-hardened by a multi-step heat treatment that precipitates an aluminium-rich phase. It distorts little on hardening and retains high strength at elevated temperature.
Typical applications include aerospace structural components, springs and spring parts, diaphragms, retaining rings and high-strength corrosion-resistant hardware operating at elevated temperature.
Typical values, precipitation-hardened condition, per EN reference data.
| Property | Value | Unit |
|---|---|---|
| Density | 7.80 | g/cm³ |
| Melting range | 1400–1440 | °C |
| Elastic modulus | 200 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 11.0 | µm/m·°C |
| Thermal conductivity (20 °C) | 15.5 | W/m·K |
| Specific heat (20 °C) | 460 | J/kg·K |
| Structure | Semi-austenitic (precipitation-hardening) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Iron | Fe | Balance | — | Base element |
| Chromium | Cr | 14.0 | 16.0 | Corrosion resistance |
| Nickel | Ni | 6.50 | 7.75 | Austenite stability |
| Molybdenum | Mo | 2.0 | 3.0 | Strength; pitting resistance |
| Aluminium | Al | 0.75 | 1.50 | Precipitation-hardening phase (Ni-Al) |
| Manganese | Mn | — | 1.00 | Deoxidiser |
| Silicon | Si | — | 1.00 | Deoxidiser |
| Carbon | C | — | 0.09 | Strength |
| Phosphorus | P | — | 0.040 | Residual impurity |
| Sulphur | S | — | 0.015 | Residual impurity |
Typical values by heat-treatment condition, per EN 10088-3 / EN 10270-3 for W.Nr. 1.4532.
| Condition | Tensile strength (Rm) | 0.2% proof (Rp0.2) | Hardness |
|---|---|---|---|
| +P1200 (TH1050) | ≥1210 MPa | ≥1100 MPa | ~40 HRC |
| +P1400 (RH950) | ≥1450 MPa | ≥1310 MPa | ~44 HRC |
| +P1500 (CH900) | ≥1690 MPa | ≥1620 MPa | ~46 HRC |
| +AT (solution-annealed) | ~900 MPa | ~380 MPa | soft |
Values per EN 10088-3; confirm against the inspection certificate (EN 10204). Elongation typically ≥2–6 % in hardened conditions, higher when solution-annealed.
| Environment | Performance | Notes |
|---|---|---|
| Atmospheric / general | Good | Better than X7CrNiAl17-7 (molybdenum addition) |
| Mild acids | Moderate | At low concentrations |
| Chloride pitting | Moderate | Improved by molybdenum |
| Oxidation | Good | Retains strength at elevated temperature |
| Seawater | Limited | Not recommended for prolonged exposure |
The molybdenum addition gives better corrosion resistance and higher strength than the aluminium-only semi-austenitic PH grade; resistance remains below the austenitic stainless steels.
A semi-austenitic precipitation-hardening alloy; supplied in the soft austenitic condition and hardened by a multi-step transformation-plus-ageing sequence.
Solution Treatment Supplied solution-treated (~1065 °C) in the soft austenitic condition for forming.
Transformation and Precipitation Hardening TH1050: austenite-conditioning at ~760 °C, cool to transform to martensite, then age at ~565 °C. RH950: condition at ~955 °C, sub-zero cool (~−73 °C) to transform, then age at ~510 °C for higher strength. Cold-rolling to martensite followed by ageing at ~480 °C gives maximum strength. Air cool after ageing.
Weldable by common fusion and resistance methods; matching filler is used. Heat treatment after welding develops full properties.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Matching 15-7-type filler |
| GMAW / MIG | Good | Matching filler |
| Resistance / spot | Good | — |
Weld in the soft solution-treated condition; heat-treat after welding to develop strength.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Solution-treated (soft) for best formability and machinability |
| Work hardening | High rate; positive feeds, rigid setup |
| Coolant | Ample flood coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Excellent in the soft condition (formable semi-austenitic PH) |
| Hot forming | ~1150–950 °C; solution treat + age afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Aerospace | Structural parts, skins, fittings | High strength at elevated temperature |
| Spring / fastener | Springs, spring wire, clips | Spring properties + fatigue resistance |
| Instrumentation | Diaphragms, bellows | Formability + fatigue resistance |
| General industrial | High-strength formed components | Strength + minimal distortion |
| Product Form | DIN / EN Standard | Notes |
|---|---|---|
| Plate, sheet and strip | EN 10088-2 / EN 10151 · W.Nr. 1.4532 | X8CrNiMoAl15-7-2 |
| Bar, rod and sections | EN 10088-3 · W.Nr. 1.4532 | — |
| Spring wire | EN 10270-3 · W.Nr. 1.4532 | — |
| Technical delivery | SEW 470 | — |
Chromium-nickel-molybdenum-aluminium semi-austenitic precipitation-hardening stainless steel. W.Nr. 1.4532 (X8CrNiMoAl15-7-2).
| EN Symbol | Cr % | Ni % | Mo % | Al % | Best Used For |
|---|---|---|---|---|---|
| X8CrNiMoAl15-7-2 | 14–16 | 6.5–7.75 | 2.0–3.0 | 0.75–1.5 | Semi-austenitic PH; high strength at temperature |
| X7CrNiAl17-7 | 16–18 | 6.5–7.8 | — | 0.75–1.5 | Semi-austenitic PH; springs, formability |
| X5CrNiCuNb16-4 | 15–17 | 3–5 | — | — | Martensitic PH; general high strength |
| X3CrNiMoAl13-8-2 | 12.25–13.25 | 7.5–8.5 | 2.0–2.5 | Al | Highest-toughness PH; aerospace |
| X10CrNi18-8 | 16–19 | 6–9.5 | — | — | Work-hardening austenitic; springs |
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