Hot Rolled EN 1.4466 Stainless Steel Pipe AISI310MoLN / S31050
Stainless Steel Tubing
1.4466 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 UNS S31050 is designed
for the fabrication of lining interiors in Urea units or
complementary products (pipes, fittings…). The grade can be used
for urea strippers.
High-nickel austenitic stainless steel for parts and components of
chemical apparatus used mainly in the production of urea. The grade
is suitable for working at elevated temperatures. 1.4466 steel is
used in the paper, nitrogen, pharmaceutical, petrochemical and
cellulose industries.
Chemical Composition of 1.4466 Stainless Steel
| Standard | Steel Grade |
|---|
| Chemical Composition % |
|---|
| C: | Mn: | Si: | P: | S: | Cr: | Mo: | Ni: | N: |
|---|
| EN | 1.4466 - X1CrNiMoN25-22-2 |
| <0.02 | <2.0 | <0.7 | <0.025 | <0.010 | 24.0 - 26.0 | 2.0 - 2.5 | 21.0 - 23.0 | 0.10 - 0.16 |
| ASTM | UNS S31050 - AISI 310MoLN - 25.22.2 |
| <0.025 | <2.0 | <0.5 | <0.020 | <0.030 | 24.0 - 26.0 | 1.6 - 3.0 | 20.5 - 23.5 | 0.09 - 0.16 |
Mark details on the pipe
- Manufacturer’s name
- Material grade
- Size
- Heat Number
HOT FORMING
Hot forming should be carried out in a temperature range of 1200 -
950°C (2732 - 1742°F) after the piece has been uniformely heat
treated. Final full annealing temperature is required to obtain the
requested microstructure. It will be performed at 1140° - 1180°C
(2084 - 2156°F) followed by water quenching.
COLD FORMING
Due to its fully austenitic microstructure, the alloy can be cold
formed without any problem. The higher molybdenum content and cold
hardening behaviour of the steel explains that it may require more
powerfull equipments than 304 stainless steel.
PICKLING
310Mo LN grade must be used in the as pickled and passivated
conditions. Pickling treatment may be performed with a nitro -
hydrofluoric acid bath (10 - 20% HN03 - 1.5 - 5% HF) at 40 - 60°C
(104 - 140°F). A 10 - 20% H2SO4 - 1.5 - 5% HF pickling bath may
also be used.
WELDING
310Mo LN can be welded with most of the welding processes: TIG,
Plasma, MIG welding, as well as SMAW, SAW or FCAW processes. The
alloy is sensitive to hot cracking phenomenon due to its fully
austenitic microstructure. Weld should be performed in order to
obtain extra - low ferrite contents, no carbide or nitride
precipitations, low silicon contents as well as no intermetallic
phase precipitations. Higher manganese content products should be
considered.
Typical Applications:
- Urea applications
- Pulp & Paper industry
- Flue gas cleaning
- Chemical industry
- Pharmaceutical industry
