Product Overview
GX40CrNiSi27-4 heat-resistant steel is a commonly used material for boiler components - engineered specifically for extreme high-temperature service in power generation, petrochemical, and industrial thermal processing equipment.
GX40CrNiSi27-4 (corresponding to EN 1.4823) is a ferritic-austenitic duplex heat-resistant casting steel that complies with EN 10295:2002 Heat Resistant Steel Castings and DIN 17465:1993 Heat-Resistant Cast Steel – Technical Delivery Conditions. This material is specifically designed for components operating in aggressive high-temperature environments where both oxidation resistance and mechanical strength are critical.
As a duplex stainless steel formulated for casting, GX40CrNiSi27-4 combines the advantages of both ferritic and austenitic microstructures, delivering exceptional performance in boiler replacement parts, furnace components, and various heat treatment fixtures.
With over a decade of foundry expertise, our company specializes in manufacturing heat-resistant steel castings that meet the most stringent industrial specifications. Our product range also includes other commonly used grades such as GX40CrSi28, GX130CrSi29, GX25CrNiSi18-9, and GX40CrNiSi25-20. Our GX40CrNiSi27-4 boiler replacement parts are produced under strict quality control, ensuring reliable operation and extended service life in your critical equipment.
Technical Specifications
Chemical Composition
| Element | Content (%) | Function |
| Carbon (C) | 0.30 – 0.50 | Provides necessary strength and hardness |
| Silicon (Si) | 1.00 – 2.50 | Forms SiO₂ protective layer; enhances oxidation resistance |
| Manganese (Mn) | ≤ 1.50 | Deoxidization and desulfurization |
| Chromium (Cr) | 25.00 – 28.00 | Forms dense Cr₂O₃ oxide film; core element for high-temperature oxidation resistance |
| Nickel (Ni) | 3.50 – 5.50 | Promotes austenite formation; improves high-temperature strength and toughness |
| Phosphorus (P) | ≤ 0.035 | Controlled impurity |
| Sulfur (S) | ≤ 0.030 | Controlled impurity |
| Molybdenum (Mo) | ≤ 0.50 | Enhances creep resistance |
- Among cast stainless steels, the composition of EN 1.4823 is notable for containing comparatively high amounts of chromium (Cr) and silicon (Si) - the key elements that impart superior oxidation and corrosion resistance at elevated temperatures.
Physical Properties
| Property | Value |
| Density | 7.6 g/cm³ |
| Thermal Conductivity | 16.7 W/(m·°C) |
| Specific Heat Capacity | 500 J/(kg·°C) |
| Thermal Expansion (20-400°C) | 13.0 × 10⁻⁶/K |
| Thermal Expansion (20-800°C) | 14.5 × 10⁻⁶/K |
| Thermal Expansion (20-1000°C) | 16.5 × 10⁻⁶/K |
| Elastic Modulus | 195 GPa |
| Melting Range | 1230 – 1480°C |
Mechanical Properties
| Property | Value |
| Tensile Strength (Rm) | 550 – 620 MPa |
| Yield Strength (Rp0.2) | 250 – 290 MPa |
| Elongation at Break | 3 – 3.4% |
| Brinell Hardness | 200 – 300 HBW |
| Maximum Service Temperature | 1100°C |
High-Temperature Performance
Our GX40CrNiSi27-4 heat-resistant steel castings demonstrate exceptional creep resistance at elevated temperatures:
- 800°C / 10,000 hours / 1% creep limit: 9 N/mm²
- 900°C / 10,000 hours / 1% creep limit: 4 N/mm²
- 1000°C / 10,000 hours / 1% creep limit: 1.5 N/mm²
The material maintains stable performance in oxidizing combustion atmospheres, reducing combustion atmospheres, and oxidizing sulfur dioxide environments - all at temperatures up to 1100°C. Maximum mechanical service temperature reaches 1100°C, with corrosion resistance up to 450°C.
Weldability
GX40CrNiSi27-4 exhibits good weldability. Suitable filler metals include X12CrNi25-4 (1.4820), X12CrNi25-20 (1.4842), and X10CrNi30-9 (1.4337). Preheating is recommended for large sections or components with varying cross-sections, though post-weld heat treatment is generally not required.
Applications
GX40CrNiSi27-4 heat-resistant steel castings are widely used across multiple high-temperature industrial sectors:
Boiler & Power Generation
- Boiler replacement parts - superheater attachments, fixture mandrels, annealing pots
- Grate bars and grate plates for sintering and clinker cooling
- Cyclone separator center tubes for circulating fluidized bed boilers
- Furnace bed plates and slag crusher teeth
Industrial Furnaces & Heat Treatment
- Heat-resistant steel casting furnace components - hearth plates operating in chamber furnaces
- Movable oven and combustion parts, runners, rails, rollers, burner nozzles
- Retorts, muffles, radiant tubes
- Charge baskets, trays, fixtures, and supports
- Furnace liners, bottom plates, and guide rails
Petrochemical & Processing
- Spraying nozzles for boilers
- Cracking tubes and reformer tubes
- Reduction retorts
Other High-Temperature Equipment
- Glass industry components - glass molds and shapes
- Industrial furnace spare parts and replacement castings
- Heat treatment fixtures and tooling
Multi-Material Customization
Beyond GX40CrNiSi27-4 (1.4823), we manufacture heat-resistant steel castings in a wide range of material grades to meet your specific operating conditions:
EN 10295 Series Heat-Resistant Casting Steels:
- GX25CrNiSi18-9 (1.4825)
- GX40CrNiSi22-9 (1.4826)
- GX25CrNiSi20-14 (1.4832)
- GX40CrNiSi25-12 (1.4837)
- GX40CrNiSi25-20 (1.4848)
- GX40CrNiSi38-18 (1.4865)
- GX40CrNiSi35-25 (1.4857)
- GX30CrNiSiNb24-24 (1.4855)
- GX40CrNiSiNb38-18 (1.4849)
- GX40CrNiSiNb35-25 (1.4852)
Additional Heat-Resistant Alloys:
- ZG40Cr25Ni20Si2 series - service temperature up to 1300°C
- ZG30Cr18Mn12Si2N - excellent thermal fatigue resistance
- ZG4Cr25Ni35NbW - for extreme service conditions
- ASTM A297 HK, HC, and other international grades
- JIS SCH13, SCH21, SCH22
Diverse Casting Processes
We employ multiple casting technologies to ensure optimal quality, precision, and cost-efficiency for every project:
| Process | Best For |
| Investment Casting (Lost-Wax) | Complex geometries, tight tolerances, superior surface finish |
| Lost Foam Casting (EPC) | Large components, complex shapes, reduced machining |
| Sand Casting | Large, heavy castings; cost-effective for high volumes |
| Centrifugal Casting | Tubes, pipes, cylindrical components |
| Resin Sand Casting | High dimensional accuracy, excellent surface quality |
Extensive Product Range
Our heat-resistant steel casting capabilities cover virtually any component you need:
Boiler & Furnace Components
Boiler replacement parts, grate bars, grate plates, furnace bed plates, hearth plates, superheater attachments, fixture mandrels, annealing pots, cyclone separator tubes
Heat Treatment Fixtures
Charge baskets, trays, retorts, muffles, radiant tubes, furnace liners, bottom plates, guide rails, supports, hangers.
Industrial Components
Runners, rails, rollers, burner nozzles, spray nozzles, slag crusher teeth, glass molds, cracking tubes, reformer tubes, reduction retorts.
Custom Engineered Parts
Any component requiring high-temperature strength, oxidation resistance, corrosion resistance, or wear resistance - manufactured to your drawings and specifications.
Everything You Need to Know
Can you manufacture according to my drawings? What information do you need from me?
Yes, we can. We offer full OEM/ODM customization services and accept both 2D and 3D drawings. Please provide the following information:
- Part drawings (any format is acceptable, such as PDF, DWG, STEP, etc.)
- Target material grade or performance requirements
- Operating parameters – working temperature, atmosphere, load conditions, etc.
- Machining precision and surface quality requirements
- Required quantity
If your application has special operating conditions, our technical team can also provide material selection recommendations and casting process simulation optimization services.
What is your typical lead time?
The lead time depends on product complexity, casting process, and order quantity. Generally speaking:
- Samples / small-batch trial production: approximately 15–25 working days
- Mass production: approximately 25–40 working days
The exact delivery schedule can be confirmed with us prior to contract signing. With over a decade of production management experience, we effectively coordinate all manufacturing stages to ensure on-time delivery.
Do you provide export packaging and shipping services?
Yes, we do. We offer professional export packaging services for international customers, including wooden crating + VCI anti-rust treatment, to ensure that products are not damaged during long-distance transportation. We also provide bilingual technical documentation and material traceability reports. We support multiple international payment methods and can flexibly arrange according to customer requirements.
What order quantities can you handle? What is your MOQ?
We support flexible order quantities ranging from single-piece trial production to high-volume mass production, with no strict MOQ (Minimum Order Quantity) limitation. Whether you need one replacement part or hundreds of pieces, we welcome your inquiry. For complex custom projects, we recommend starting with sample validation, and proceeding to mass production only after approval.
Hot Tags: gx40crnisi27-4 heat-resistant steel casting replacement parts for boilers, China gx40crnisi27-4 heat-resistant steel casting replacement parts for boilers manufacturers, suppliers, factory, 310S Vacuum Furnace Charging Basket, boiler parts, boiler sections, heat resistant steel casting parts, parts in a boiler, parts of a boiler
