EN 1.4713, also known as Sicromal 8, X10CrAlSi7 (often written as X10CrAlSi 7) and sometimes referenced as X10CrAl7 in trade descriptions, is a ferritic chromium-aluminium-silicon alloyed heat-resistant steel designed for service at elevated temperatures. It is primarily used in oxidizing atmospheres (hot air and combustion gases), where its alloying elements help form a protective oxide layer that reduces scaling.
Because the base structure is ferritic, the material is magnetic and typically chosen for furnace and thermal processing components that need good oxidation resistance and dimensional stability. Suitability always depends on the actual temperature, thermal cycling, atmosphere (oxidizing vs. carburizing/nitriding) and the stress level of the component.
| Element | Typical range (wt. %) |
|---|---|
| C | ≤ 0.12 |
| Si | 0.5 – 1.0 |
| Mn | ≤ 1.0 |
| P | ≤ 0.04 |
| S | ≤ 0.03 |
| Cr | 6.0 – 8.0 |
| Al | 0.5 – 1.0 |
| Fe | Balance |
| Property | Typical value (room temperature) |
|---|---|
| Tensile strength (Rm) | per standard / see EN 10204 3.1 certificate |
| Yield strength (Rp0.2) | per standard / see EN 10204 3.1 certificate |
| Elongation (A5) | per standard / see EN 10204 3.1 certificate |
| Hardness | per standard / see EN 10204 3.1 certificate |
| Oxidation resistance | designed for high-temperature air service |
Exact values are stated on the material certificate EN 10204 / 3.1.
1.4713 / Sicromal 8 is supplied in a broad range of product forms for fabrication and machining. Typical supply includes round bar, flat bar, blocks, forgings and sheets/plates. In addition, processing such as cutting to size (plasma / water-jet / laser / sawing) is commonly available on request.
Round bar (hot rolled / forged, peeled / turned to DIN EN 10060; lengths 4–6 m):
Ø 16 mm, Ø 18 mm, Ø 20 mm, Ø 22 mm, Ø 24 mm, Ø 25 mm, Ø 26 mm, Ø 28 mm, Ø 30 mm, Ø 35 mm, Ø 36 mm, Ø 40 mm, Ø 45 mm, Ø 50 mm, Ø 55 mm, Ø 60 mm, Ø 70 mm, Ø 80 mm, Ø 100 mm
Flat bars (hot rolled & pickled to DIN EN 10058; lengths 4–6 m):
Sizes: 30 × 5 mm – 80 × 10 mm
Blocks / sawn from forged prime material: sizes on request.
Sheets / plates (hot rolled, finish 1):
Thickness: 3 mm – 20 mm
Width: 1000 / 1250 / 1500 / 2000 mm
Length: 2000 / 2500 / 3000 / 6000 mm (up to max. 15000 mm on request)
Cut-to-size processing: plasma cutting / water-jet cutting / laser cutting / sawn cuttings available.
Centerless grinding available on request. Provide your required diameter tolerances and surface finish when requesting a quotation for precision shafts or machined components.
Sicromal 8 is designed for oxidizing high-temperature environments such as hot air and combustion gases. Chromium, silicon and aluminium contribute to a protective oxide layer that helps reduce scaling during long-term exposure.
Resistance in carburizing or nitriding conditions is typically limited compared to higher alloyed austenitic heat-resistant grades. For severe carburizing atmospheres, alternatives such as 1.4835 / 253MA or higher alloyed Sicromal grades are often preferred. The exact furnace atmosphere should be checked before final selection.
Yes. 1.4713 can be welded using appropriate procedures and filler materials intended for heat-resistant steels. Controlling heat input and using good fit-up practices helps reduce distortion and limits the risk of embrittlement. Post-weld cleaning is recommended; post-weld heat treatment is typically defined by the application requirements.
Common supply forms include round bar, flat bar and sheets/plates. Blocks, forgings (discs/rings) and cut-to-size parts (plasma, water-jet, laser or sawn) are available on request. Availability depends on dimensions and required delivery condition.
Yes. Material is supplied with EN 10204 / 3.1 certification, confirming traceability and listing chemical analysis and relevant mechanical test results for the delivered condition.
Certificates: EN 10204 / 3.1
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