Risk reduction. It’s a key focus if you produce nitric acid for fertilizer, urea or other processes in harsh environments, such as those found in boilers. Susceptibility to stress corrosion cracking (SCC), localized pitting and high temperature can lead to unsafe and costly unscheduled shutdowns.
To address these problems, Alleima provides materials specifically designed to “de-risk” your plant operations. Our range includes both austenitic and duplex stainless steels as well a bimetallic solution that combines high strength and extremely good corrosion resistance.
Common challenges
- Stress corrosion cracking (SCCs) in harsh environment
- Localized pitting in high-temperature, corrosive conditions
Main industries served
- Fertilizer production
- Urea synthesis
- General chemical processing
Our grades for nitric acid service
| Alleima grade | UNS | EN no. | |
|---|---|---|---|
| Alleima® 2RE10 | S31002 | 1.4335 | Austenitic stainless steel with excellent resistance to corrosion in nitric acid |
| SAF™ 2906 | S32906 | - | High-alloy duplex with excellent corrosion resistance in caustic environments and environments with chlorides. |
| SAF™ 2304 | S32304 | 1.4362 | High strength lean duplex with very good resistance to stress corrosion cracking |
| Alleima® 3R12 | S30403 | 1.4306 1.4301 | Austenitic stainless steel capable of handling nitric acid over a wide range of temperatures and concentrations |
Formats and sizes
Our nitric acid tube portfolio includes both imperial and metric sizes, ranging from 12 mm to 40 mm (0.472 to 1.575 in.) in outside diameter. Custom sizes can also be manufactured upon request. Tubes are available in lengths of up to 30 meters or as U-bent configurations. For more information, please contact us.
Bimetallic tubes – affordable zironium performance
Corrosion in the re-boiling zone can reduce the efficiency of shell-and-tube heat exchangers. Our bimetallic tube combines a zirconium (Alleima® Zr-702) inner liner, known for exceptional corrosion resistance, with an outer layer of Alleima® 2RE10 stainless steel, ensuring strength and weldability.
This design protects against corrosion while enabling the use of a stainless steel tube plate or re-tubing of stainless steel heat exchangers. Welding is simplified with stainless-to-stainless connections, eliminating the need for post-weld heat treatment.
For welding recommendations and techniques, see our tube datasheets or contact us.