EN 1.4724 / X10CrAlSi13

Heat Resisting Ferritic Stainless Steel

A chromium‑aluminum‑silicon alloyed ferritic grade engineered for sustained oxidation resistance and structural stability in aggressive high‑temperature environments up to 850 °C. Supplied globally by FUSHUN METAL — Hunan Fushun Metal Co., Ltd.

850 °C Max. Service Temp.
192 HB Max. Hardness (+A)
12–14% Chromium Content
MOQ 1pc Ready Stock
3.1 MTC EN 10204 Cert.
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Product Overview

1.4724, designated X10CrAlSi13 per EN/DIN standards, is a premium heat-resisting ferritic stainless steel engineered for sustained performance in demanding thermal environments. Its controlled alloying with chromium (12.0–14.0%), aluminum (0.7–1.2%), and silicon (0.7–1.4%) creates a synergistic effect: the combined presence of Cr and Al promotes the formation of a dense, self-healing mixed oxide layer (Cr2O3 / Al2O3) that significantly retards scaling and material degradation at elevated service temperatures.

Unlike austenitic heat-resisting grades, 1.4724 offers a lower coefficient of thermal expansion and superior thermal conductivity, translating directly into exceptional resistance to thermal fatigue under repeated heating and cooling cycles — a critical advantage for components in cyclic furnace operations. The grade also exhibits excellent resistance to sulfur-bearing and combustion gases, making it indispensable in burner and exhaust environments.

FUSHUN METAL (Hunan Fushun Metal Co., Ltd.) supplies 1.4724 to global manufacturers, EPC contractors, and precision machining shops requiring reliable, cost-effective performance in the most thermally aggressive applications. From ready-stock rolled bar to large-diameter custom forgings, we serve as your single-source technical partner for this grade.

International Equivalent Grade Cross-Reference

Table 1 — International Equivalent Grade Cross-Reference for 1.4724 / X10CrAlSi13
Standard System Grade / Designation Equivalency Status
EN / DIN (Europe) 1.4724 / X10CrAlSi13 Primary Reference
AFNOR (France) Z10CAS13 Direct Equivalent
GOST (Russia) 10X13C1U Approximate Equivalent
UNS (USA) S40900 Similar Category
Grade equivalency inquiry: Not certain which designation applies to your project specification? Contact our technical sales team at info@fushunspecialsteel.com — we will confirm cross-standard equivalency and provide a competitive quotation.

Typical Applications

Thanks to its excellent oxidation resistance, long-term thermal stability, and resistance to sulfur-rich atmospheres, 1.4724 is widely specified for components that operate under sustained high-temperature conditions. The following sectors represent the principal application areas served by FUSHUN METAL customers worldwide.

Furnace Components

Annealing boxes, furnace baffles, burner nozzles, radiant tubes, and structural supports in continuous and batch-type industrial furnaces.

Heat Exchangers

High-temperature heat exchanger tubes and plates, gas-to-gas recuperators, and thermal processing equipment in chemical and petrochemical plants.

Exhaust Systems

Heavy-duty industrial exhaust manifolds, mufflers, catalytic converter substrates and shells exposed to high-velocity combustion gases.

Power Generation

Boiler casing components, soot blower tubes, and combustion chamber linings in fossil-fuel and waste-heat power plants.

Material Handling

Conveyor belts, link chains, baskets, and fixtures for high-temperature continuous heat treatment furnaces, kilns, and sintering lines.

Applicable Standards

FUSHUN METAL manufactures and supplies 1.4724 in strict accordance with internationally recognized standards, ensuring consistent chemical composition, verified mechanical properties, and full heat-to-shipment traceability for our global client base.

EN 10095
Heat resisting steels and nickel alloys — the primary governing standard covering hot-rolled and forged bars, plates, sheets, and strip for ferritic and austenitic heat-resisting grades. Defines chemical composition limits, mechanical property requirements, and test procedures.
DIN 17470
Heating element alloys — a historical German reference standard for Cr-Al-Si ferritic compositions closely related to the 1.4724 family. Frequently cited in legacy engineering specifications and project documentation.

Chemical Composition

The chemical composition of 1.4724 is tightly controlled throughout every stage of melting, refining, and casting to guarantee optimal oxidation resistance, microstructural stability, and consistent long-term service performance. All values below are expressed as mass fraction (wt.%).

Table 2 — Chemical Composition of X10CrAlSi13 (1.4724) per EN 10095 (wt.%)
Grade Name EN Number C (max) Si Mn (max) P (max) S (max) Cr Al
X10CrAlSi13 1.4724 0.12 0.70 – 1.40 1.00 0.040 0.015 12.0 – 14.0 0.70 – 1.20
Heat-specific OES (optical emission spectrometry) chemical analysis results are documented in the EN 10204 3.1 Mill Test Certificate supplied with every shipment. EN 10204 3.2 certificates with third-party witness are available upon request.

Mechanical Properties

The following room-temperature mechanical properties apply to 1.4724 in the standard annealed condition (+A) — the delivery condition in which FUSHUN METAL routinely supplies this grade. The annealed state ensures maximum machinability, optimal formability, and dimensional stability prior to final component fabrication.

Table 3 — Room Temperature Mechanical Properties of X10CrAlSi13 (1.4724), Annealed Condition (+A), per EN 10095
Grade Name EN Number Condition Hardness Max (HB) Rp0.2 Min (MPa) Rm (MPa) A Min (%)
X10CrAlSi13 1.4724 +A (Annealed) 192 250 450 – 650 15

Rp0.2: 0.2% proof (yield) strength. Rm: ultimate tensile strength. A: elongation at fracture (gauge length L0 = 5.65√S0).

Heat Treatment

Correct heat treatment practice is essential for maintaining the ferritic microstructure of 1.4724 and preventing the embrittlement phenomena characteristic of high-chromium ferritic grades. FUSHUN METAL supplies this grade in the annealed condition as standard, ensuring readiness for downstream fabrication.

Table 4 — Heat Treatment Parameters for 1.4724 / X10CrAlSi13
Treatment Type Temperature Range (°C) Cooling Method Purpose
Annealing 800 – 860 Air cooling or water quenching Relieve internal stresses; soften the material; restore ductility after cold or hot working operations.
Critical — 475°C Embrittlement Risk: Prolonged exposure to temperatures between 400°C and 550°C must be strictly avoided in both processing and service. This temperature range promotes the well-documented “475°C embrittlement” mechanism in high-chromium ferritic steels, causing severe and often irreversible loss of toughness and ductility. Design service temperature profiles and heat treatment schedules to eliminate dwell time within this critical range.

Available Forms, Sizes & Delivery

FUSHUN METAL’s manufacturing infrastructure — anchored by a 6,000-ton forging press and a GFM radial forging machine — ensures superior internal soundness, precise dimensional control, and a comprehensive range of product forms to match your machining and fabrication requirements.

Product Forms & Dimensional Range

Table 5 — 1.4724 Available Product Forms and Standard Dimensional Range
Product Form Dimensional Range Remarks
Rolled Round Bars Ø 10 mm – 150 mm Standard stock sizes; immediate dispatch available
Forged Round Bars Ø 150 mm – 800 mm GFM radial forged; superior soundness and straightness
Rolled / Forged Flat Bars T: 20–400 mm × W: 50–800 mm As-rolled, rough-machined, or precision-ground
Steel Plates / Sheets T: 2 mm – 100 mm Cut-to-size and plasma/laser cutting service available
Steel Wire Ø 1 mm – 20 mm Coil or straightened lengths; custom spooling available

Delivery Options & Minimum Order Quantity

Ready Stock
MOQ: 1 Piece
Common sizes held in inventory for immediate dispatch. Delivery approximately 7 days from order confirmation.
Custom Forgings & Rolled
MOQ: 3 Tons
Tailored dimensions and non-standard cross-sections. Standard lead time approximately 30 days.
Small Batch Special Melts
From 3–5 Tons
Custom chemistry or special-route melts via dedicated induction furnaces. Flexible minimum volumes for R&D or trial orders.
Large Volume Orders
EAF 30–60 Ton
Electric Arc Furnace heats for major project requirements. Rapid high-volume production without quality compromise.

Melting & Metallurgical Processing Routes

FUSHUN METAL offers flexible, advanced metallurgical processing routes precisely tailored to the purity demands and performance requirements of your specific application. Our engineers will analyze your end-use specification and recommend the most technically appropriate and cost-effective melting strategy.

Standard Production Route

EAF LF Refining VD AOD Ingot Casting Forging / Rolling Heat Treatment Inspection & QC

AOD (Argon Oxygen Decarburization) is integral to the standard route for this high-chromium ferritic grade — precisely controlling carbon and sulfur levels while maximizing chromium recovery and yield.

Premium & Critical-Application Remelting Routes

  • ESR / PESR — Electro-Slag Remelting / Pressurized ESR: Recommended for applications requiring superior micro-cleanliness, significantly reduced non-metallic inclusion content, and improved isotropic mechanical properties across large cross-sections.
  • VIM + VAR — Vacuum Induction Melting + Vacuum Arc Remelting: Available for the most demanding aerospace, defence, or nuclear applications. Delivers ultra-low dissolved gas content (N, O, H), maximum compositional homogeneity, and the highest degree of microstructural integrity.

Surface Finish & Precision Machining

FUSHUN METAL provides a full range of surface conditions and in-house machining capabilities, reducing your downstream processing burden and total procurement cost. Whether you require a rough-machined forging block or a ready-to-install precision shaft, our machining services are fully adaptable to your engineering drawing requirements.

Table 6 — Available Surface Conditions and Machining Capabilities for 1.4724
Delivery Condition Surface Roughness (Ra) Typical Application / Remarks
As-Forged / As-Rolled (Black) — (mill scale) For heavy downstream machining, hot forming, or weld fabrication
Turned & Milled Ra 3.2 – 6.3 μm General-purpose engineering components; near-net-shape delivery
Precision Ground Ra 0.8 – 1.6 μm Close-tolerance shafts, sealing contact surfaces, precision bearing fits
CNC Precision Machined Per drawing (up to IT6–IT7) Complex profiles, flanged components, ready-to-assemble precision parts

Quality Assurance & Inspection

Quality is the operational cornerstone of FUSHUN METAL. Our comprehensive quality management system spans the entire production lifecycle — from raw material qualification through final shipment inspection — ensuring that every piece of 1.4724 meets or exceeds the most stringent industrial standards.

Non-Destructive Testing (NDT)

100% Ultrasonic Testing (UT) performed on all forged products per SEP 1921 or EN 10228-3, guaranteeing the complete absence of internal defects, segregations, cracks, and voids throughout the full cross-section.

Laboratory Mechanical & Chemical Testing

Rigorous OES chemical composition analysis, tensile and 0.2% proof strength testing, elongation measurement, Brinell hardness verification, and metallographic grain size examination are conducted for every production heat.

Mill Test Certificates (MTC)

EN 10204 3.1 Mill Test Certificates are supplied as standard with every shipment. EN 10204 3.2 certificates, endorsed and countersigned by an independent third-party inspection agency, are available upon request.

Third-Party Inspection

Pre-shipment inspection coordination with internationally accredited agencies is routinely managed by our quality team. We welcome representatives from SGS, TÜV, Bureau Veritas, and equivalent bodies.

System Certifications

ISO 9001 Quality Management
AS9100 Aerospace Quality
EN 10204 3.1 MTC Standard
EN 10204 3.2 (on request)
SGS / TÜV / Bureau Veritas

Packing & Shipping

FUSHUN METAL employs meticulous, export-grade packaging protocols designed to ensure that all materials arrive in pristine condition — dimensionally intact and fully protected against corrosion — irrespective of destination port, transit time, or climatic conditions during ocean freight.

Black Surface Bars & Plates

Products are securely bundled using heavy-duty steel binding wire and reinforced with wooden dunnage and corner blocking to prevent shifting, mutual abrasion, and impact damage within the shipping container. Each bundle carries a heat-number label for full shipment traceability.

Bright, Machined, or Precision-Ground Surfaces

A three-layer protection system is systematically applied: the steel surface is first coated with premium anti-rust inhibitor oil, then individually wrapped in VCI (Volatile Corrosion Inhibitor) paper, and finally encased in robust wooden boxes or custom-fabricated export crates. This comprehensive moisture-barrier system guarantees that surface finish quality and dimensional precision are fully preserved throughout long-haul ocean freight, regardless of humidity variations encountered in transit.

Frequently Asked Questions

Answers to the most common technical and commercial questions received from procurement engineers and project managers sourcing 1.4724 / X10CrAlSi13 from FUSHUN METAL.

What is the maximum operating temperature for 1.4724 steel?
1.4724 exhibits excellent scaling resistance in air up to approximately 850°C. However, the precise maximum service temperature is dependent on the specific atmospheric conditions encountered during operation — particularly the concentration of sulfur-bearing or carbon-rich gases — as well as the magnitude of mechanical load applied simultaneously. For critical or borderline applications, FUSHUN METAL’s technical team recommends a detailed discussion to define the optimal service parameters and material selection strategy.
Can you cut 1.4724 to my specific required length or custom dimensions?
Yes. FUSHUN METAL maintains a full range of high-precision cutting equipment, including band saws and CNC cutting centres. We can cut round bars, flat bars, plates, and forged blocks to your exact required lengths or bespoke block dimensions. This value-added cut-to-size service eliminates unnecessary sawing operations from your production schedule and minimises chargeable material waste.
Is 1.4724 readily weldable, and what precautions are required?
Like most ferritic heat-resisting steels, 1.4724 can be welded using standard arc welding processes, but the procedure requires careful control. Preheating to approximately 200–300°C is generally recommended prior to welding to prevent rapid grain coarsening and the formation of a brittle Heat Affected Zone (HAZ). Post-weld annealing at 800–860°C is frequently necessary to fully restore HAZ ductility and relieve residual welding stresses. Filler metal selection should be confirmed against your welding procedure specification (WPS) prior to production welding.
What is the hardness of 1.4724 in the standard annealed condition?
In the standard annealed delivery condition (+A), the maximum hardness of 1.4724 is 192 HB (Brinell Hardness). This relatively low hardness level renders the material well-suited for conventional subtractive machining operations including turning, milling, drilling, and grinding, using standard carbide tooling or HSS tooling with appropriate cutting parameters.

Source 1.4724 Heat Resisting Steel from FUSHUN METAL

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