Application Segments

Oil & Gas/CPI

Melting Route

Airmelted + ESR

Product Description

BÖHLER A405 is a stainless austenitic Cr-Ni-Mo steel with nitrogen content and extremely low carbon content. Resistant to intergranular corrosion up to 400°C.
Heat treatment after welding is not required. Required surface finish: pickled. Very good cold formability. Highly polishable.
For components with the highest resistance to boiling concentrated nitric acid and equipment in contact with solutions containing high levels of chloride at high temperatures, as well as for highly stressed equipment in the urea industry.
The chemical composition has been optimised for specific uses in urea plants. It is a 310L modified austenitic stainless steel with low carbon, low silicon and high nitrogen additions in order to stabilize and strengthen the austenitic phase. The alloy is particularly designed for improved corrosion resistance properties in urea carbonate environments. The grade is also well designed for resistance in wet corrosive conditions due to its high contents of chromium, molybdenum and nitrogen (PREN > 33). BÖHLER A405 is designed for the fabrication of lining interiors in Urea units or complementary products (pipes, fittings…). The grade can be used for urea strippers.

Technical Specifications

Material Numbers

1.4466 X1CrNiMoN25-22-2 S31050 A182-F310MoLN

Chemical Composition

Chemical composition (average %)
max. 0.030 max. 0.40 max. 2.00 max. 0.030 max. 0.015 24.0 to 26.0 2.00 to 3.00 21.0 to 23.0 0.10 to 0.16


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