ASTM B168 Alloy 602 CA UNS N06025 Sheet and Plate
Alloy 602 CA Sheet and Plate
Alloy 602 CA sheet and plate is a nickel-chromium-iron material selected for components exposed to demanding furnace and thermal-processing conditions. Its chromium and aluminum support formation of a protective oxide scale, while controlled carbon and other alloying additions contribute to elevated-temperature strength. The material is used for fabricated furnace parts, trays, fixtures and process equipment. Selection depends on the actual metal temperature, atmosphere, applied load and thermal cycling. Sheet, plate and cut pieces are available in the solution-annealed condition; dimensions, surface finish, inspection and documentation can be specified for the intended order.
Specifications and Supply Range
| Grade | Alloy 602 CA / UNS N06025 / W.Nr. 2.4633 |
|---|---|
| Product Forms | Sheet, plate, strip, cut plate and fabricated blank |
| Standard | ASTM B168 / ASME SB-168 |
| Condition | Solution annealed |
| Surface | Oxidized, pickled, descaled or as specified |
| Thickness | 0.5–50 mm |
| Width × Length | Width 100–2000 mm; length 500–6000 mm, or cut to drawing |
The dimensions above describe common market production capability, not current stock. Final availability is confirmed against the complete enquiry.
Chemical Composition
Specification limits, weight percent. Nickel is the balance.
| Cr | Fe | C | Al | Ti | Y | Zr | Ni |
|---|---|---|---|---|---|---|---|
| 24.0–26.0 | 8.0–11.0 | 0.15–0.25 | 1.8–2.4 | 0.10–0.20 | 0.05–0.12 | 0.01–0.10 | Balance |
Mechanical Properties
| Condition | 0.2% Yield Strength | Tensile Strength | Elongation |
|---|---|---|---|
| Solution annealed sheet and plate up to 50 mm | ≥270 MPa | ≥675 MPa | ≥30% |
Room-temperature acceptance values do not replace elevated-temperature design data. Final requirements follow the applicable specification, thickness, code and purchase order.
High-Temperature Features and Applications
| Oxidation Resistance | High chromium and aluminum contents support the formation of a protective oxide scale during elevated-temperature exposure. |
|---|---|
| Carburization Resistance | The alloy is used in furnace and thermal-processing environments where carburizing conditions are part of the material-selection review. |
| Creep Strength | Controlled carbon and microalloying additions support long-term load-bearing performance at elevated temperature. |
| Thermal Cycling | The alloy is considered for components exposed to repeated heating and cooling, subject to atmosphere, geometry and stress review. |
Service temperature cannot be selected from one maximum value alone. Actual metal temperature, atmosphere, applied stress, exposure time, cycling and design-code requirements must be assessed together.
- Heat-treatment furnace components and fixtures
- Radiant tubes, furnace rolls, trays and supports
- High-temperature petrochemical and thermal-processing equipment
- Components exposed to oxidation, carburization and repeated thermal cycling
Fabrication, Inspection and Documentation
Alloy 602 CA can be cut, formed, machined and welded using procedures developed for high-nickel alloys. Clean joint preparation, controlled heat input and qualified welding procedures are important for the intended high-temperature service.
Where welded components operate in critical temperature ranges, the applicable material data sheet, design code and project welding specification should be used to determine whether additional heat treatment is required.
| Processing | Cut-to-size plate, profiles, holes, machining allowance, edge preparation and formed blanks can be reviewed from drawings. |
|---|---|
| Inspection | PMI, chemical analysis, tensile, hardness, dimensional inspection and applicable NDT can be arranged when specified. |
| Documentation | EN 10204 3.1 MTC, inspection reports and third-party witnessing can be included in the order. |
For an accurate quotation, include the product and grade or standard, dimensions, quantity, processing and inspection documents, destination and any special requirements in your message.
Frequently Asked Questions
What standard covers Alloy 602 CA sheet and plate?
ASTM B168 and ASME SB-168 cover applicable nickel-chromium-iron alloy plate, sheet and strip, including UNS N06025.
Is Alloy 602 CA the same as Alloy 601?
No. They have different controlled chemistries and performance profiles. Any substitution requires review of the temperature, atmosphere, stress, fabrication procedure and applicable design code.
What maximum temperature can Alloy 602 CA plate use?
A single universal maximum should not be used for every component. Actual metal temperature, atmosphere, load, exposure time, cycling and geometry must be assessed together.
Is the listed size range current stock?
No. It represents common supply capability. Current availability is confirmed against the required dimensions, quantity and delivery schedule.
