Premium Heat-Resistant Boiler Support Profiles
Our GX40CrSi28 heat-resistant cast steel boiler pad iron profiles (material number 1.4776) are cast components specifically designed for high-temperature structural support, load distribution and precise leveling in industrial boilers and thermal equipment. Manufactured in strict accordance with the European standard EN 10295 for heat-resistant steel castings, this product delivers exceptional thermal stability, structural integrity and long-term operational reliability under extreme high-temperature conditions. As a superior alternative to ordinary cast iron boiler support parts, our GX40CrSi28 cast steel profiles are widely recognized in the industrial furnace, boiler and combustion equipment sectors.
Technical Specifications & Material Data
Our heat-resistant cast steel profiles are produced with strict adherence to chemical composition and material specifications:
| Property | Value | Standard Reference |
| Material Grade | GX40CrSi28 / EN 1.4776 | EN 10295-2002 |
| Equivalent Grades | ZG40Cr28Si2 (GB/T 8492-2014), GX40CrSi29 (DIN), SCH2X2 (JIS) | ISO / GB / DIN / JIS |
| C | 0.30 – 0.50% | EN 10295 |
| Cr | 27.0 – 30.0% | EN 10295 |
| Si | 1.00 – 2.50% | EN 10295 |
| Mn | ≤ 1.00% | EN 10295 |
| P | ≤ 0.040% | EN 10295 |
| S | ≤ 0.030% | EN 10295 |
| Ni | ≤ 1.00% | EN 10295 |
| Mo | ≤ 0.50% | EN 10295 |
- Equivalent international grades include GX40CrSi28 (ISO), GX40CrSi29 (DIN), GX40CrSi28 (NF France) and ZG40Cr28Si2 (China GB/T 8492-2014).
Product Features & Performance Advantages
Exceptional High-Temperature Strength and Thermal Stability
The high chromium content (27-30% Cr) in this heat-resistant cast steel forms stable chromium carbides within a ferritic matrix, enabling it to maintain excellent strength even under sustained high temperatures. This makes the profile extremely suitable for long-term high-temperature applications such as heat treatment equipment, combustion devices, and thermal power generation facilities.
Superior High-Temperature Oxidation Resistance
GX40CrSi28 cast steel exhibits outstanding oxidation resistance at elevated temperatures. The material naturally forms a protective oxidation-resistant layer on its surface, which protects components from degradation and surface damage even under prolonged harsh operating conditions, thereby significantly extending the service life of boiler pad iron profiles and support elements.
Excellent Wear Resistance and Abrasion Protection
The optimized silicon content (1.0-2.5%) enhances the material's ability to resist wear and abrasive particle erosion, making these profiles particularly suitable for high-load, high-friction boiler support environments where dimensional stability is critically required.
Precision Casting and Dimensional Accuracy
All our boiler pad iron profiles are produced using advanced precision casting processes, ensuring tight tolerances, smooth surface finishes, and consistent quality across different batches. These processes significantly improve the surface quality and accuracy of the heat-resistant castings, ensuring their stability in demanding operating environments.
Microstructural Stability and Long Service Life
The microstructural characteristic of this heat-resistant cast steel is the uniform distribution of chromium carbides in a ferritic matrix, which contributes to its excellent long-term creep resistance and structural stability under sustained thermal cycling conditions.
Customization and Multi-Format Supply
We offer comprehensive manufacturing and processing services, including investment casting, sand casting, lost foam casting, and centrifugal casting. Our production lines can accommodate various heat treatment processes and machining requirements according to customer specifications. We supply finished heat-resistant castings that have undergone heat treatment and machining, precisely meeting your requirements.
Product Applications
These heat-resistant cast steel boiler pad iron profiles are designed for diverse high-temperature applications. Key uses include boiler support and leveling systems, boiler grates, combustion equipment, furnace parts, grate bars, and belt conveyors. They also serve as support pads and base frames in heat treatment furnaces, thermal power generation equipment, and as heat-resistant structural supports in petrochemical and chemical processing. Automotive applications include high-temperature pad iron for engine valves and crankshafts.
Company Advantages - Why Partner With Us
Specialized Heat-Resistant Casting Expertise
We are a world-class raw iron and steel materials supplier specializing in heat-resistant cast steel products, including GX40CrSi28 (1.4776), GX40CrSi17, GX40CrSi24, GX30CrSi7, GX130CrSi29 and many other grades. Our products comply with international standards including EN 10295, GB/T 8492-2014, DIN 17465, ISO 11973 and other global specifications, ensuring consistent quality for export markets.
Complete Manufacturing & Processing Capability
We provide comprehensive in-house manufacturing services including precision casting, heat treatment (solution annealing, normalizing, tempering), and advanced machining. Our processing services include cutting, drilling, bending, welding, and finishing according to customer requirements.
Custom Design & Engineering Support
With strong technical expertise, we offer complete custom manufacturing according to customer drawings and specifications for heat-resistant cast steel profiles and pad iron components. Whether you need standard profiles or complex custom shapes, our engineering team can deliver.
Quality Assurance & Certification
Every batch of our heat-resistant cast steel products undergoes rigorous quality inspection and testing. We provide material certifications including chemical composition analysis, mechanical property verification, and non-destructive testing reports to ensure full traceability and compliance with international standards.
Competitive Pricing & Stock Availability
We maintain large inventory of EN 10295 steel grades to meet urgent client demands. Our efficient production processes and supply chain management allow us to offer competitive pricing without compromising on quality. We can supply regular size steel plates, bars, profiles, and custom castings with short lead times.
Global Export Experience & Logistics Support
With extensive experience in international trade, we offer professional export packaging (seaworthy plywood cases, pallets, or as per customer requirements), timely shipping arrangements, and dedicated after-sales service to ensure a smooth procurement experience for our international clients.
Everything You Need to Know
What is the Brinell hardness of this heat-resistant cast steel?
The typical Brinell hardness of GX40CrSi28 heat-resistant cast steel is approximately 210 HBW (HBW 2.5/187.5) when heat-treated.
How does silicon content improve the performance of boiler pad iron profiles?
Silicon strengthens the steel strength, enhances high-temperature oxidation resistance, and significantly increases wear resistance, making it essential for boiler support pad iron profiles used in abrasive and high-temperature environments.
Can you produce non-standard profiles and custom pad iron dimensions?
Yes. We offer full custom manufacturing services to produce heat-resistant cast steel pad iron profiles and support components according to your technical drawings and specifications. Please contact our engineering team with your requirements.
What is the typical service life of GX40CrSi28 boiler pad iron profiles?
With proper installation and within specified operating temperature ranges, GX40CrSi28 pad iron profiles offer exceptional service life due to their superior oxidation resistance, high-temperature strength retention, and microstructural stability. However, actual service life depends on specific operating conditions including temperature, load, and chemical environment.
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