1.4466
UNS S31050
UREA 25.22.2
310MoLN
UREA 25.22.2 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 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). UREA 25.22.2 is designed for the fabrication of lining interiors in Urea units or complementary products (pipes, fittings…). The grade can be used for urea strippers.
Mechanical Properties
| Tensile strength: | 500-700 | N/mm² |
| Yield strength 0,2% : | 200 | ≥ N/mm² |
| Elongation: | 40/30 | ≥ % |
| Hardness HB30: | 215 | ≤ HB |
Chemical Composition
CARBON
C
0,020% max
SILICON
Si
0,40% max
MAGNESE
Mn
2% max
PHOSPHORUS
P
0,020% max
SULPHUR
S
0,010% max
CHROMIUM
Cr
24-26%
MOLYBDENUM
Mo
2,0-2,6%
Nickel
Ni
21,0-23,5%
NITROGEN
N
0,10-0,15%
heat treatment (1140°-1180°C –2084-2156°F) and water quenching
OTHER UREA grades
| Tensile strength: | 490-690 | N/mm² |
| Yield strength 0,2% : | 205 | ≥ N/mm² |
| Elongation: | 35 | ≥ % |
| Hardness HB30: | – | ≤ HB |
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