Product Overview
ZG40Cr25Ni20Si2 is a premium heat-resistant cast steel grade, specifically designed for extreme thermal environments. As a heat treatment industrial furnace bottom plate, this component serves as the foundational support for workpieces in furnaces operating at temperatures up to 1100°C. Manufactured through precision casting processes (centrifugal or static casting), our ZG40Cr25Ni20Si2 plates offer exceptional resistance to oxidation, carburization, and thermal fatigue. They are widely used in continuous furnaces, roller hearth furnaces, and batch-type heat treatment lines.
This heat-resistant steel casting combines high chromium and nickel content with silicon addition, ensuring superior performance in aggressive atmospheres. The material is equivalent to ASTM A297 Grade HK or 310S stainless steel in cast form, but with optimized silicon for enhanced scaling resistance.
Key Features & Benefits
- Excellent High-Temperature Strength: Maintains structural integrity under heavy loads at elevated temperatures.
- Outstanding Oxidation Resistance: The Cr-Ni-Si composition forms a protective oxide layer, preventing scaling up to 1100°C.
- Carburization Resistance: Ideal for carburizing and carbonitriding furnaces where carbon-rich atmospheres are present.
- Thermal Shock Resistance: Designed to withstand repeated heating and cooling cycles without cracking.
- Dimensional Stability: Precision casting ensures flatness and uniform thickness, reducing distortion during service.
- Long Service Life: Reduces downtime and replacement costs in continuous operation.
Chemical Composition (Typical %)
| Element | Content (%) |
| Carbon (C) | 0.35 – 0.45 |
| Chromium (Cr) | 24.0 – 27.0 |
| Nickel (Ni) | 19.0 – 22.0 |
| Silicon (Si) | 1.5 – 2.5 |
| Manganese (Mn) | ≤ 1.5 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.04 |
Mechanical Properties
Room Temperature Performance
- Tensile Strength: ≥ 550 MPa
- Yield Strength: ≥ 240 MPa
- Elongation: ≥ 8%
- Hardness: 180 – 230 HB
High-Temperature Performance
The alloy maintains excellent creep strength and oxidation resistance at continuous operating temperatures of 1000°C–1100°C. Short-term exposure up to 1150°C is permissible without significant degradation.
Applications
Where Our ZG40Cr25Ni20Si2 Furnace Bottom Plates Excel
- Heat Treatment Furnaces: Bottom plates for hardening, annealing, normalizing, and tempering lines.
- Carburizing & Carbonitriding Furnaces: Resists carbon pickup and embrittlement.
- Roller Hearth Furnaces: Used as load-bearing hearth plates.
- Continuous Annealing Lines: For steel coils and wire processing.
- Ceramic Kilns: Supports for ceramic ware at high temperatures.
- Petrochemical & Power Generation: Internal components in high-temperature reactors and boilers.
Custom Manufacturing Capabilities
We offer ZG40Cr25Ni20Si2 furnace bottom plates in a variety of dimensions and configurations:
- Thickness: 20 mm to 100 mm (or custom)
- Width/Length: Up to 2000 mm x 3000 mm (depending on casting process)
- Design: Flat plates with or without ribs, perforated for airflow, or with locating pins.
- Surface Finish: As-cast or machined to tight tolerances.
- Process: Static casting for simple shapes; centrifugal casting for tubular components; investment casting for complex geometries.
Products Description
Precision patterns designed to customer drawings.
Silica sand or resin-bonded molds for accuracy.
Induction furnace melting with strict chemical control.
Solution annealing to optimize microstructure and relieve stresses.
Grinding, shot blasting, and machining as required.
Dimensional checks, chemical analysis, mechanical testing, and non-destructive testing (optional).
Why Choose Us as Your ZG40Cr25Ni20Si2 Furnace Bottom Plate Supplier?
Extensive Experience in Heat-Resistant Castings
With over 20 years in the foundry industry, we specialize in high-temperature alloy steel castings for industrial furnaces. Our team understands the critical demands of thermal cycling and corrosive environments.
01
State-of-the-Art Foundry & Machining Facilities
We operate fully automated molding lines, medium-frequency induction furnaces, and CNC machining centers. This ensures consistent quality and short lead times for both prototypes and mass production.
02
Customization & Engineering Support
Not every furnace is the same. We work closely with clients to design ZG40Cr25Ni20Si2 bottom plates that match specific furnace dimensions, load requirements, and atmosphere conditions. Our engineers provide DFM (Design for Manufacturability) feedback to optimize performance.
03
Rigorous Quality Control
Every batch undergoes chemical analysis and mechanical testing. We maintain traceability from raw material to finished product. Third-party inspections (SGS, BV) are welcome.
04
Competitive Pricing & Flexible MOQ
We offer factory-direct prices without compromising quality. Whether you need one replacement plate or a hundred for a new furnace line, we accommodate your order quantity.
05
Frequently Asked Questions
What is the maximum operating temperature for ZG40Cr25Ni20Si2?
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Continuous service up to 1100°C, with intermittent peaks up to 1150°C.
Can you supply plates with machined slots or holes?
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Yes, we offer complete machining services to meet your exact specifications.
What is the typical lead time?
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For standard sizes, 20–30 days; for custom designs, 30–45 days depending on complexity.
Do you provide material certifications?
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Absolutely. We supply mill test reports with chemical and mechanical properties.
How do I prevent distortion of furnace bottom plates?
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Proper design with reinforcing ribs and stress-relief heat treatment during manufacturing helps. We can advise on optimal design for your application.
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