Alloy 602 CA
Alloy 602 CA (UNS N06025, W.Nr. 2.4633, NiCr25FeAlY) offers exceptional oxidation, carburization and creep resistance up to about 1200°C, for radiant tubes, furnace muffles, rotary kilns and superheater components. It is a VDM Metals grade - sold as VDM Alloy 602 CA or Nicrofer 6025 HT - and not an INCONEL alloy, which is why it sits in the nickel alloys family rather than under Inconel.
Available Forms
- Alloy 602 CA Coil
- Alloy 602 CA Fittings
- Alloy 602 CA Foil
- Alloy 602 CA Pipe
- Alloy 602 CA Plates
- Alloy 602 CA Round Bars
- Alloy 602 CA Sheets
- Alloy 602 CA Tube
- Alloy 602 CA Wire
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | N06025 |
| Werkstoff / EN number | 2.4633 |
| EN designation | NiCr25FeAlY |
| Density | 7.93 g/cm3 |
| Melting range | 1340-1400 °C |
| Relative magnetic permeability (20 °C) | 1.01 (maximum) |
Identifiers and physical constants for 602 CA. A dash means no such designation is published for this grade.
Specifications by Product Form
602 CA (N06025) is supplied to a different standard in each form. Quote the one that matches the product you are ordering.
| Product form | Specification |
|---|---|
| Plate, sheet and strip | ASTM B168 |
| Rod and bar | ASTM B166 |
| Wire | ASTM B166 |
Surface Condition of 602 CA Sheet and Plate
602 CA sheet and plate is supplied in the solution-annealed condition only, annealed in an atmospheric furnace. Two surface finishes follow from that: scaled, with the furnace oxide left in place, or ground, with the oxide removed mechanically.
Grinding is the only correct way to descale this alloy. Pickling attacks the grain boundaries and leaves intergranular defects, so it is not an option on 602 CA the way it is on many other grades. If you need a bright surface, it has to be ground.
When to specify the scaled finish
The retained oxide layer is an advantage in heavy, very-high-temperature service — oxidising, carburising, or sulphidising conditions in reducing atmospheres. In some applications it does the job of a separate pre-oxidation treatment, removing that step entirely. Among the sheet and plate grades VDM produces, the scaled finish is offered on 602 CA alone.
When not to
Scale must not be welded through. Where weld seams are planned, grind and clean the surface for a minimum of 20 mm on both sides of the joint before welding. If most of the material is going to be welded, the ground finish is usually the more sensible order.
Surface condition guidance reflects the material producer’s published recommendations for this grade. Confirm the finish you need when enquiring — scaled and ground are ordered differently and are not interchangeable once delivered.
Material We Have Handled
We stock and cut 602 CA in the hot-rolled, annealed and scaled condition, including 8 mm VDM Alloy 602 CA (2.4633 / UNS N06025) marked to DIN 17742–17750, DIN EN 10302 and ASTM B / ASME SB 168. Photographs of the mill markings, our incoming PMI checks and the export packing are on our quality and verification page, along with a recent 602 CA delivery completed in sixteen days against a twenty-day deadline.
Aurico Alloys LLP supplies Alloy 602 CA across all the forms above, with material test certificates (EN 10204 3.1) and export-ready packaging from Mumbai, India. Contact us for stock availability and pricing.