UREA GRADES 1.4466 – 25.22.2 – 310MoLN – S31050 – 2RE69
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Industeel UREA™ 310Mo LN chemical composition has been optimized for specific uses in urea plants.
It is a 310L modified austenitic stainless steel with low carbon, low silicon and high nitrogen content in order to stabilize and strengthen the austenitic phase.
The alloy is designed to obtain a fully austenitic stainless steel free of intermetallic phases as intergranular carbide precipitations which affect drastically the corrosion resistance properties of the alloy in urea containing solutions.
The ferrite level is kept under 0.5% in the solution annealing and water quenched conditions.
The alloy is particularly designed for improved corrosion resistance properties in urea carbonate environments including strippers.
The grade is also well designed for resistance in wet corrosive conditions due to its high contents of chromium, molybdenum and nitrogen (PREN ≥ 33).
|> EURONORM :||EN 1.4466||X1 Cr Ni Mo N 25-22-2|
|> ASTM :||310 MoLN||UNS S31050|
The UREA™ 310Mo LN grade is particularly designed for urea applications.
The corrosion resistance properties are enhanced thanks to the low carbon level and silicon level and complementary additions of nitrogen.
Typical maximum corrosion results required following different specifications for the 310Mo LN grade after 5 periods of 48 h following ASTM A 262
C practice are : maximum general corrosion : 1,6 µm/48 h or 65 mg/dm² per hour with a maximum depth of microcracks of 100 µm in the long direction of rolling. Industeel UREA™ 310Mo LN modified grade behaves much better than those maximum values.
The steel Industeel UREA™ 310Mo LN is designed for the fabrication of lining interiors in urea units or complementary products (pipes, fittings...).
The grade can also be used for urea strippers.