Advancing industries through materials technology

Our development and manufacturing of advanced stainless steels and special alloys is world-leading.

It’s what we’ve been doing for over 160 years, and it’s still our reason to exist.

Fueled by our desire to care, deliver and evolve, we benefit our customers, our people, and the future we share. And it’s how we relentlessly push products and processes to be more efficient, more profitable, and more sustainable.

We are a leading manufacturer of high value-added products in advanced stainless steels and special alloys, as well as products for industrial heating. With close and long-standing customer partnerships, we advance processes and applications in some of the most demanding industries imaginable.

Our offering and in-depth expertise in materials technology, metallurgy, and industrial processes enable customers to become more efficient, profitable, sustainable, and safer.

We’re here to advance industries through materials technology. Our expertise enables more efficient, more profitable, and more sustainable processes, products, and applications for our customers.

Solution Provider since 2009


Sofie Fastesson
Product Manager Fertilizer
Sandviken, Sweden

+46 706 160 651

Urea Stripper tubes

Stripper tubes in advanced materials specially developed for the most critical parts of the urea process. Alleima urea stripper tubes are acknowledged for their exceptional ability to resist corrosion in highly aggressive environments and their low life-cycle cost.

Our urea stripper tubes are primarily used in the Stamicarbon process but also in processes such as Casale and Saipem.

Table: Urea stripper tube materials (other grades can be offered on request)

Safurex®Safurex® is a patented, highly corrosion resistant material developed for the Stamicarbon process. It is designed to enable an oxygenless process that increases output and safety.
Alleima™ 2RE69Alleima 2RE69 (“25.22.2”) is developed specifically for the most severe conditions in the urea production process. It is a special high-alloy grade with a very low or zero ferrite content
Alleima bimetallic tubingAlleima bimetallic tubing consists of an outer component of Alleima 2RE69 and an inner component of Zirconium 702, resulting in superior corrosion resistance, strength and weldability.

World Record for High Pressure CO2 stripper with Alleima™ 2RE69 tubes

A wide range of products for urea production

In addition to urea stripper tubes, our offering includes several other solutions for high-pressure parts in urea production. Examples are:

  • Pipes
  • Fittings and flanges
  • Plates
  • Round bars
  • Welding products

in various materials like Alleima 2RE60 (“316L Urea Grade or Mod”) and Alleima 2RE69 (“25.22.2”)


Nitric acid tubes

Tubes for nitric acid production in a range of grades including both austenitic and duplex stainless steels and a bimetallic solution which provides both high strength and extremely good corrosion resistance.

Table: Our grades for nitric acid service

Alleima gradeUNSEN no.
Alleima® 2RE10S310021.4335Austenitic stainless steel with excellent resistance to corrosion in nitric acid
SAF™ 2906S32906High-alloy duplex with excellent corrosion resistance in caustic environments and environments with chlorides.
SAF™ 2304S323041.4362High strength lean duplex with very good resistance to stress corrosion cracking
Alleima® 3R12S304031.4306 1.4301Austenitic stainless steel capable of handling nitric acid over a wide range of temperatures and concentrations

Our tube portfolio for nitric acid includes imperial and metric sizes, from outside diameter 12 mm up to 40 mm (0.472 to 1.575 in.). Special sizes can be made to order. Lengths are supplied up to 30 meters, or as U-bent tubes. For details please contact us.

Bimetallic tubes: zirconium performance at a lower price

Corrosion in the re-boiling zone can decrease the efficiency and productivity of a shell and tube heat exchanger. Our solution is a bimetallic tube with an inner tube made of zirconium (Alleima® Zr-702), one of the most corrosion-resistant metals available. The zirconium inner tube is mechanically bonded to the outer tube, made of Alleima® 2RE10. The inner liner prevents corrosion while the outer tube provides strength and positive welding properties.

The bimetallic tube will also enable the use of a stainless steel tube plate or even re-tubing of an entire stainless steel heat exchanger. And since welding is purely stainless-to-stainless, no post weld heat treatment will be necessary.

For recommended welding consumables and information on welding techniques, please see the welding section in tube datasheets, or contact us.


Hydrogen & Renewable energy

Alleima product offering enables the transition to renewable energy sources, electrification of industries, innovation in the medical sector and much more.




Solution Provider since 2009

Sofie Fastesson
Product Manager Fertilizer
Sandviken, Sweden

+46 706 160 651
UreaKnowHow is an independent group of nitrogen fertilizer specialists with an impressive number of years experience in designing, maintaining and operating nitrogen fertilizer plants.

Solution Providers offer their solutions to improve our member’s plants performance.