1. Engineered for High-Temperature Performance
When industrial furnaces, heat treatment systems, and sintering equipment demand reliable air circulation and structural integrity under extreme heat, the choice of grille bars makes all the difference. Our 1.4823 resin-coated sand cast air-cooled grille bars are precision-engineered to deliver exceptional heat resistance, dimensional accuracy, and long service life in the most demanding thermal environments.
2. The Material Advantage: 1.4823 Heat-Resistant Steel
Material 1.4823 - also designated as GX40CrNiSi27-4 under EN 10295 - is a high-alloy heat-resistant cast steel specifically formulated for service temperatures exceeding 600°C. With a maximum operating temperature of 1100°C for oxidation resistance in clean air, this grade is the material of choice for furnace internals, sintering grates, and air-cooled grating systems.
Material 1.4823 - also designated as GX40CrNiSi27-4 under EN 10295 - is a high-alloy heat-resistant cast steel specifically formulated for service temperatures exceeding 600°C. With a maximum operating temperature of 1100°C for oxidation resistance in clean air, this grade is the material of choice for furnace internals, sintering grates, and air-cooled grating systems.
Chemical Composition (EN 1.4823 / GX40CrNiSi27-4):
| Element | Range |
| C | 0.30 – 0.50% |
| Cr | 25.00 – 28.00% |
| Ni | 3.5 – 5.5% |
| Si | 1.0 – 2.5% |
| Mn | ≤ 1.50% |
Key Mechanical Properties:
- Tensile Strength: ≥ 550 MPa
- Yield Strength (Rp0.2): ≥ 250 MPa
- Elongation: ≥ 3%
- Thermal Conductivity: 16.7 W/(m∙K)
- Specific Heat Capacity: 500 J/(kg∙K)
- Density: 7.6 kg/dm³
The high chromium and silicon content gives 1.4823 exceptional resistance to oxidizing gases and combustion products at elevated temperatures. This makes it particularly suitable for air-cooled grille bars that must withstand repeated thermal cycling, direct flame exposure, and mechanical loading in furnace environments.
The Process Advantage: Resin-Coated Sand (Shell Molding) Casting
Precision casting is not just about the material - it's about how the material is shaped. Our resin-coated sand casting process (also known as shell molding or the Croning process) represents a significant advancement over conventional sand casting methods.
Superior Dimensional Accuracy and Surface Finish
Resin-coated sand casting produces castings with surface quality and dimensional precision approaching that of investment casting (lost-wax process), while internal quality reaches Level 1 radiographic inspection standards. The fine-grain sand and resin mixture allows for smooth surfaces and improved dimensional control compared to conventional sand molds. This means your air-cooled grille bars arrive with minimal machining allowance, reducing secondary processing costs and lead times.
Thin Shell, Less Waste, Lower Cost
Unlike traditional green sand casting which requires 30–50 cm of sand thickness, resin-coated sand molding uses a thin shell of just 5–10 mm. This dramatically reduces material consumption - by up to 80% compared to conventional resin sand casting - and the spent sand can be fully recycled. The result: lower production costs and a more sustainable manufacturing process.
Cleaner, Safer, More Efficient
The resin-coated sand process generates significantly less emissions - up to 70% reduction in ammonia and formaldehyde compared to conventional formulas, and 85% reduction in flue gas emissions. The working environment is cleaner, with minimal dust pollution. Combined with automated production lines, this translates to higher productivity, reduced labor intensity, and consistent quality batch after batch.
Excellent Collapsibility and Casting Integrity
Molds and cores made with resin-coated sand exhibit good strength, high permeability to mold gases, and easy collapsibility after casting. This reduces casting defects such as veining, finning, gas porosity, and shrinkage - common problems that compromise the service life of conventional sand-cast components.
The Synergy: When 1.4823 Meets Resin-Coated Sand Casting
The true power of our air-cooled grille bars lies in the combination of material and process.
1.4823 provides the thermal stability and oxidation resistance to survive at 1100°C. Resin-coated sand casting ensures that every grille bar maintains tight dimensional tolerances, smooth surfaces, and consistent internal quality - no weak points, no hidden defects.
This synergy is particularly critical for air-cooled grille bars, which must:
- Withstand direct heat exposure without warping or sagging
- Maintain precise spacing for uniform air distribution
- Resist oxidation and scaling over thousands of thermal cycles
- Support mechanical loads at elevated temperatures
With 1.4823's tensile strength of ≥550 MPa even at high temperatures, and resin-coated sand casting's ability to produce complex geometries with ±0.1mm precision, our grille bars deliver reliable performance where others fail.
Comprehensive Customization
Every furnace is different. Every application has unique requirements. That's why we don't offer one-size-fits-all solutions - we offer complete customization.
Multi-Material Capabilities
Beyond 1.4823 (GX40CrNiSi27-4), we cast grille bars and other heat-resistant components in a wide range of grades, including:
- 1.4848 (GX40CrNiSi25-20) – higher nickel content for extreme temperatures
- 1.4841 (GX40CrSi28) – silicon-rich for maximum oxidation resistance
- ASTM A297 HH, HK, HL – American standard heat-resistant grades
- 310S / 309S – austenitic stainless steels for high-temperature service
- Custom alloys – formulated to your specific service conditions
Endless Product Variety
We don't just cast grille bars. Our foundry produces a comprehensive range of heat-resistant and wear-resistant castings:
- Furnace grates and grille plates – for sintering furnaces, walking beam furnaces, and roller hearth furnaces
- Heat treatment baskets and trays – for carburizing, quenching, and tempering
- Furnace rollers and radiant tubes – for continuous annealing lines
- Support beams and skid rails – for steel billet transportation
- Wear-resistant liners and hammers – for mining and crushing equipment
- Custom-engineered components – to your drawings and specifications
Full Customization Options
- Dimensions: From small precision parts up to 200 kg castings
- Geometry: Complex shapes, thin walls, intricate internal passages
- Tolerances: Precision-grade or as-cast, per your requirements
- Surface treatment: As-cast, shot-blasted, machined, or coated
- Quantity: Prototype to high-volume production
OEM & ODM Services
We work from your CAD drawings, 2D sketches, or physical samples. Our engineering team collaborates with you to optimize the design for castability, performance, and cost-effectiveness. Whether you need a standard replacement part or a completely new design, we deliver.
About Juhe Yulong Special Steel Co., Ltd.
Shandong Juhe Yulong Special Steel Co., Ltd. is a specialized manufacturer of high-performance castings with over a decade of production experience.
Our Expertise
We focus on extreme-service materials for demanding environments - heat-resistant steels, corrosion-resistant alloys, and wear-resistant metals. Our product portfolio spans:
- Heat-resistant steel castings (furnace components, grilles, baskets, trays)
- Stainless steel castings (precision components, pump parts, valve bodies)
- Wear-resistant castings (liners, hammers, crusher parts)
- Bimetal composite castings (for extended service life)
Our Facilities
- Resin-coated sand (shell molding) production lines – for high-precision, high-volume casting
- Investment casting (lost-wax) capabilities – for complex, intricate components
- Sand casting – for larger, heavier sections
- In-house heat treatment – for optimizing mechanical properties
- CNC machining – for finished, ready-to-install components
Quality Assurance
We maintain rigorous quality control throughout the production chain:
- Raw material certification – every melt is analyzed and documented
- In-process inspection – dimensional checks, visual inspection, NDT
- Radiographic inspection – Level 1 quality assurance
- Mechanical testing – tensile, hardness, impact as required
- Traceability – full documentation from melt to shipment
Applications
Our 1.4823 resin-coated sand cast air-cooled grille bars are widely used in:
- Powder metallurgy sintering furnaces – for uniform air distribution and load support
- Ceramic kilns and building material furnaces – high-temperature ventilation and load-bearing
- Walking beam furnaces and roller hearth furnaces – billet support and transport
- Box-type heat treatment furnaces – workpiece support and spacing
- Continuous annealing and quenching furnaces – high-temperature conveyance
- Carburizing and case-hardening furnaces – basket and tray systems
- Waste-to-energy incinerators – grate bars and support grilles
- Metallurgical and automotive heat treatment lines – furnace internals
Get in Touch
Ready to discuss your air-cooled grille bar requirements? Need a custom alloy or a complex geometry? Contact Shandong Juhe Yulong Special Steel Co., Ltd. today.
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