1.4335
UNS S 31002
X1 Cr Ni 25.21
310L NAG
Austenitic stainless steel with sharp control of the residual elements in order to provide high corrosion resistance properties in boiling 50-65% Nitric acid solutions. The silicon content is kept under 0.3% while the carbon content is lower than 0.015%.
Molybdenum additions are also well known to reduce the behaviour of the steel in nitric acid solutions. This explains why the molybdenum content is guaranteed lower than 0.3% . The sharp control of Carbon, Silicon and phosphorus contents makes it possible to produce a more stable austenite microstructure, free of intermetallic or carbide precipitations. The alloy is designed for nitric acid applications.
- Production of nitric acid,
- Ammonium nitrate production,
- Nuclear fuel reprocessing
- Hydrofluoric pickling.
The grade is not recommended for concentrated nitric acid purposes or highly oxydizing nitric acid solutions (with Cr VI species…)
Mechanical Properties
| Tensile strength: | 470-670 | N/mm² |
| Yield strength 0,2% : | 283 | ≥ N/mm² |
| Elongation: | 40 | ≥ % |
| Hardness Brinell: | 220 | ≤ HB |
Chemical Composition
CARBON
C
0,02% max
SILICON
Si
0,15% max
MAGNESE
Mn
2,0% max
PHOSPHORUS
P
0,025% max
SULPHUR
S
0,005% max
CHROMIUM
Cr
24-26% max
NICKEL
Ni
20-22% max
NITROGEN
N
0,10% max
1100/1150°C (2010/2100°F) followed by rapid cooling.
OTHER Nitric acid grades
| Tensile strength: | 650-880 | N/mm² |
|---|---|---|
| Yield strength 0,2% : | 450 | ≥ N/mm² |
| Elongation: | 25 | ≥ % |
| Hardness HB30: | 270 | ≤ HB |
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