Product Overview
1.4848 Heat-Resistant Steel Cast Mechanical Parts – Engineered for extreme high-temperature service, our 1.4848 (GX40CrNiSi25-20) austenitic heat-resistant steel castings are designed to withstand continuous operation in demanding industrial environments. As a high-alloy austenitic heat-resistant casting steel conforming to EN 10295:2002, 1.4848 heat-resistant steel delivers exceptional performance in temperatures up to 1100°C–1150°C, with short-term peak tolerance reaching 1150°C. Whether you need heat-resistant steel cast mechanical parts for furnace rollers, radiant tubes, petrochemical cracking fittings, or high-temperature valves and flanges, our 1.4848 heat-resistant steel castings offer the durability and reliability your operations demand.
Material Specifications & Chemical Composition
1.4848 heat-resistant steel (also designated as GX40CrNiSi25-20) is classified as an austenitic heat-resistant casting steel with a density of approximately 7.8 g/cm³. The material complies with multiple international standards including:
- European Standard: EN 10295:2002 – Heat resistant steel castings
- German Standard: DIN 17465-1993
- Chinese Equivalent: ZG40Cr25Ni20Si2 (GB/T 20878) / 06Cr25Ni20
- US Reference: ASTM A297 Grade HH (chemical composition similar)
Chemical Composition (wt.%)
| Element | Content Range | Function |
| C | 0.30 – 0.50% | Enhances high-temperature strength through carbide precipitation; provides precipitation strengthening |
| Si | 1.00 – 2.50% | Improves oxidation resistance and enhances casting fluidity |
| Mn | ≤ 2.00% | Aids deoxidation and suppresses harmful effects of sulfur |
| Cr | 24.00 – 27.00% | Forms dense Cr₂O₃ protective oxide film; core element for high-temperature oxidation and sulfidation resistance |
| Ni | 19.00 – 22.00% | Stabilizes austenitic structure; enhances high-temperature strength and creep resistance |
| P | ≤ 0.04% | Strictly controlled to minimize negative impact on toughness and weldability |
| S | ≤ 0.03% | Strictly controlled to minimize negative impact on toughness and weldability |
| Mo | ≤ 0.50% | Improves high-temperature performance |
- The high chromium (24–27%) and nickel (19–22%) content, combined with silicon strengthening, gives 1.4848 heat-resistant steel its superior high-temperature stability. The precision-controlled chemistry ensures consistent performance across all 1.4848 heat-resistant steel cast mechanical parts.
Physical & Mechanical Properties
Physical Properties
| Property | Value |
| Density | ~7.8 g/cm³ |
| Melting Range | ~1340 – 1390°C |
| Thermal Conductivity | 14.6 W/(m∙°C) |
| Coefficient of Thermal Expansion (20–800°C) | 13.5 × 10⁻⁶/°C |
Mechanical Properties (Room Temperature)
| Property | Value |
| Tensile Strength (Rm) | ≥ 450 MPa |
| Yield Strength (Rp0.2) | ≥ 220 MPa |
| Elongation (A) | ≥ 8% |
High-Temperature Performance
| Temperature | Creep Rupture Strength (10,000h / 1% creep) |
| 700°C | 66 MPa |
| 800°C | 36 MPa |
| 900°C | 17 MPa |
| 1000°C | 7 MPa |
- High-Temperature Strength: At 800°C, tensile strength ≥ 200 MPa, yield strength ≥ 120 MPa – significantly superior to ordinary austenitic stainless steels
- Oxidation Resistance: Oxidation weight gain rate ≤ 1.5 g/m²·h at 1100°C, suitable for long-term high-temperature service
- Creep Resistance: Creep rupture strength ≥ 35 MPa at 950°C / 1000 hours, meeting thermomechanical cyclic loading requirements
- As-Cast Hardness: 180–220 HB
These mechanical properties make 1.4848 heat-resistant steel cast mechanical parts the ideal choice for components subjected to simultaneous thermal and mechanical stress.
Key Material Advantages
Superior High-Temperature Stability & Creep Resistance
1.4848 heat-resistant steel maintains exceptional stability at operating temperatures of 1050–1100°C, with short-term peak tolerance up to 1150°C. The high nickel content (~20%) ensures stable austenitic structure from room temperature to elevated temperatures, while fine M₂₃C₆ carbides precipitate and disperse along grain boundaries, effectively pinning grain boundaries and hindering dislocation movement. This results in outstanding high-temperature strength and creep deformation resistance – 1.4848 heat-resistant steel cast mechanical parts resist sagging and deformation even under heavy loads at 1100°C.
01
Exceptional Oxidation & Corrosion Resistance
The high chromium content (24–27%) enables the formation of a dense, stable Cr₂O₃ protective oxide film on the surface. Combined with silicon's strengthening effect, a Cr₂O₃-SiO₂ composite oxide film forms that is both dense and firmly adherent. This provides outstanding resistance against:
- High-temperature oxidation and scaling
- Sulfidation and sulfur-containing atmospheres
- Carburization and carbon penetration
- Flue gas and dust particle erosion
The material exhibits corrosion rates ≤ 0.1 mm/year in concentrated sulfuric acid, nitric acid, and molten alkalis – outperforming 316L stainless steel.
02
Excellent Thermal Fatigue & Thermal Shock Resistance
The stable austenitic microstructure of 1.4848 heat-resistant steel provides excellent high-temperature toughness, ductility, and thermal fatigue resistance. Our 1.4848 heat-resistant steel cast mechanical parts resist cracking and brittle fracture under repeated heating and cooling cycles, making them ideal for equipment subjected to frequent start-stop operations and thermal cycling.
03
Outstanding Carburization & Coking Resistance
The high nickel content (~20%) effectively inhibits carbon penetration, preventing embrittlement and spalling. The dense oxide layer also resists coke buildup and scaling, ensuring sustained heat transfer efficiency over extended service life.
04
Superior Castability & Weldability
The silicon content (1.0–2.5%) improves molten metal fluidity during casting, while the fully austenitic structure allows for welding using AWS E310-16 or similar consumables. Our 1.4848 heat-resistant steel cast mechanical parts are designed for ease of fabrication and installation.
05
Typical Applications
1.4848 heat-resistant steel cast mechanical parts are widely used across multiple industries
Heat Treatment & Furnace Equipment
- Furnace rollers and hearth rolls
- Radiant tubes (straight, U-type, W-type, bent, and special-shaped)
- Heat treatment baskets, trays, and fixtures
- Annealing covers and furnace bottom plates
- Retorts and muffles
Petrochemical & Chemical
Industry
- Ethylene cracking tubes and furnace tubes
- Reformer tubes and tube sheets
- High-temperature valves and flanges
- Chemical reactor components
Metallurgical Industry
- Continuous annealing furnace rollers
- Galvanizing line sink rolls
- Walking beam furnace components
- Kiln heat-resistant parts
Power Generation
& Energy
- Boiler tubes for thermal power plants
- Steam generator supports for nuclear power stations
- High-temperature piping systems
Automotive & Aerospace
- Turbocharger housings
- Exhaust manifolds
- High-temperature fasteners
Cement & Building Materials
- Preheater cyclones and internals
- Grate cooler plates
Full Customization Services
We understand that every industrial application has unique requirements. That's why we offer comprehensive customization for all 1.4848 heat-resistant steel cast mechanical parts:
Casting Processes Available
- Centrifugal Casting – Ideal for tubes, pipes, and cylindrical components; produces dense, void-free structures with excellent uniformity
- Investment Casting (Lost Wax) – For complex geometries and precision components
- Sand Casting – For larger, heavy-section castings
- Silica Sol Precision Casting – For high dimensional accuracy and smooth surface finish
Custom Specifications
- Dimensions: Outer diameter from Φ50mm to Φ600mm; wall thickness 10–30mm; single-piece length up to 6m
- Shapes: Straight tubes, U-type, W-type, bent tubes, special-shaped radiant tubes, rings, ring plates, custom-designed mechanical parts
- Tolerances: Wall thickness tolerance ±0.5mm
Value-Added Processing
- Precision Machining: Turning of inner/outer diameters, end face finishing, chamfering, drilling, tapping
- Welding & Assembly: Flange integration, end caps, supports, thermocouple ports, mounting bases – integrated welding
- Surface Treatment: As-cast, machined, or coated as required
- Inspection & Testing: Dimensional inspection, non-destructive testing (NDT), hydrostatic pressure testing, straightness correction
- Heat Treatment: Solution annealing to eliminate casting stresses and enhance high-temperature toughness and dimensional stability
Customization Options
- Material Grade Selection: 1.4848 / GX40CrNiSi25-20, plus other heat-resistant grades (HK40, HP40, SCH22, 1.4849, etc.)
- Drawing-Based Manufacturing: Produce precision components per customer drawings and specifications
- Non-Standard Design: Custom engineered solutions for unique applications
- Import Replacement: Domestic production to replace imported furnace tubes and components
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