Page 3 - SD 2205

P. 3

SD 2205

CORROSION General corrosion resistance
RESISTANCE
a) Sulfuric and phosphoric acids

SD 2205

% H 2SO 4 + 2000 ppm Cl - 54%P 20 5 2% - H 2SO 4 + 0.2%HF+1.6%H 2SiF 6
Industrial solution Industrial solution

General corrosion resistance properties of SD 2205 alloy are generally much better
than austenitic 316L and 317LN alloys. SD 2205 alloy is now used extensively in
newly designed chemical tankers

b) Caustic media (pulp and paper) and organic acids

mm/year
10 50 100 g/l Cl mm/year

45N 45N 45N

0.1 316
316
0.2

316
0.3

Heat transfert Solution at 140°C (285°F) Acetic 100% Formic 50% Oxalic 10% Acetic 50%
Sample at 80°C (175°F) Boiling Boiling Boiling Formic 50%
Pulp and paper caustic solution with sulphur compounds Boiling
acid solutions
General corrosion resistance in organic solutions or caustic solutions is improved
by the use of SD 2205 instead of 304 or 316 L grades. SD 2205 is now extensively
used in chemical industries (organic and inorganic) and in the pulp and paper
industry.

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