Noram SX™
Behaviour in Concentrated Nitric Acid (HNO₃)
NORAM SX™ (UNS S32615) is an austenitic stainless steel developed for use in strongly oxidizing acids. The alloy contains 4.8–6.0% silicon, which promotes formation of a stable silicon‑dioxide (SiO₂) layer when exposed to concentrated nitric acid. This layer gives the material a high level of corrosion resistance.
In nitric acid concentrations of 95–97%, the corrosion rate is essentially zero under typical operating conditions. Both the base material and welds show similar corrosion behaviour, including in systems with flowing acid.
Use of NORAM SX™ in Nitric Acid Environments
Due to its corrosion resistance and mechanical stability, NORAM SX™ is suited for equipment used in concentrated nitric acid service. The alloy has been applied for many years in oxidizing acid environments.
NORAM SX™
Examples of typical applications include:
- Acid piping and distribution systems
- Condensers
- Storage and buffer tanks
- Absorption towers and internal components
The combination of a stable SiO₂ surface film, low corrosion rate and solid mechanical properties contributes to reliable long‑term performance in demanding nitric acid processes.
Technical manager
Pontus Lindh
Mechanical Engineer
NORAM INTERNATIONAL AB
Gruvgatan 35, SE-421 30 Västra Frölunda, Sweden
E-mail
Sales
Martin Hagström
Inventory and Sales Manager, SX
NORAM INTERNATIONAL AB
Gruvgatan 35, SE-421 30 Västra Frölunda, Sweden
M: +46 (0) 721 72 75 21
D: +46 (0) 31 757 40 21
E-mail