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IGC Practice ASTM A262 (Huey Test) Stainless Steel Material 725LN UREA Grade 25-22-2(CR,NI,MO) UNS S31050
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.
| Tensile strength: | 540-740 | N/mm² |
| Yield strength 0,2% : | 250 | ≥ N/mm² |
| Elongation: | 35/30 | ≥ % |
| Hardness Brinell: | 240 | ≤ HB |
The chemical composition of stainless steel grade 310 MoLN is outlined in the following table.
| Element | Content (%) |
|---|---|
| Iron, Fe | Balance |
| Chromium, Cr | 24-26 |
| Nickel, Ni | 21-23 |
| Molybdenum, Mo | 2-2.50 |
| Manganese, Mn | ≤ 2 |
| Nitrogen, N | 0.10-0.16 |
| Silicon, Si | ≤ 0.70 |
| Phosphorous, P | 0.025 |
| Carbon, C | ≤ 0.020 |
| Sulfur, S | ≤ 0.010 |
heat treatment (1140°-1180°C –2084-2156°F) and water quenching
The corrosion resistance properties are enhanced thanks to the low carbon level, low silicon level and complementary additions of nitrogen.
Typical maximum corrosion results required following different
specifications for the 25.22.2 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.
All material will be marked as follow:
Material will be delivered with certificate EN 10204 3.1
| EURONORM/DIN | WERKSTOFF NR. | AISI | UNS | BRAND NAME |
|---|
| X2 CrNiMo 18-14-3 | 1.4435 | 316L UG | S 31603 | 316L MOD UREA ® 3R60 UREA GRADE |
| X1 CrNiMoN 25-22-2 | 1.4466/1.4465 | 310 MoLN | S 31050 | 25.22.2 ® |
| 1.4477 | S32906 | DMV 29.7 |
