VALVA Super Austenitic valves are engineered for environments where standard 316L stainless steel fails due to pitting and crevice corrosion. With a high content of molybdenum, chromium, and nitrogen, these valves provide a high-performance, cost-effective alternative to expensive nickel-based alloys in aggressive chloride environments.
The “6-Moly” & High-Alloy Advantage
Super Austenitic steels are defined by their superior resistance to localized attack. The key features include:
- High PREN Value: Most of our super austenitic grades have a Pitting Resistance Equivalent Number (PREN) > 40, ensuring stability in warm seawater and acidic chloride solutions.
- Excellent Fabricability: Unlike some duplex steels, super austenitic alloys maintain excellent ductility and toughness, making them ideal for complex valve internal components.
- Corrosion Resistance: Highly resistant to stress corrosion cracking (SCC) and general corrosion in mixed acids, such as dilute sulfuric and phosphoric acids.
Major Application Fields
- Marine & Offshore: Desalination plants, seawater handling systems, and cooling water pipes for offshore platforms.
- FGD Systems: Flue Gas Desulfurization in power plants where acidic condensates are present.
- Chemical & Pulp/Paper: Handling chlorine dioxide, bleach, and other highly oxidizing process chemicals.
- Oil & Gas: Subsea equipment and downhole components in high-chloride wells.
Material Grades & Standards
We offer a range of global standard super austenitic alloys to meet specific project budgets and technical needs:
| Common Grade | Brand Name Equivalent | UNS Designation | Cast Equivalent |
| 254SMO | 6% Mo Super Austenitic | S31254 | CK3MCuN |
| AL-6XN | 6% Mo Alloy | N08367 | CN3MN |
| 904L | High-Alloy Austenitic | N08904 | N08904 |
| Alloy 20 | Sulfuric Acid Alloy | N08020 | CN7M |
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