![]() In flue gases containing sulphur, the corrosion resistance is reduced. Sandvik 3R60, containing about 2.6% Mo, has substantially higher resistance to attack than these steels of type AISI 304 and also better resistance than ordinary AISI 316/316L steels with 2.1% Mo.Ĭreep behavior should also be taken into account when using the steel in the creep range. Resistance to these types of corrosion improves with increasing molybdenum content. This is an advantage in complicated welding operations. The resistance to grain boundary attack is much better for AISI 316L than for AISI 316. The TTC-diagram, Figure 1, shows the result of corrosion testing for 24 hours in boiling Strauss solution (12% sulphuric acid, 6% copper sulphate). Sandvik 3R60 has a low carbon content and therefore better resistance to intergranular corrosion than steels of type AISI 316. Conditions when plants are shut down must also be considered, as the condensates which are then formed can develop conditions that lead to both stress corrosion cracking and pitting. Such service conditions should therefore be avoided. This may occur at temperatures above about 60☌ (140☏) if the steel is subjected to tensile stresses and at the same time comes into contact with certain solutions, particularly those containing chlorides. ![]() sulphates, sulphides and sulphitesĪustenitic steels are susceptible to stress corrosion cracking. The steel can also be used in sulphuric acid of concentrations above 90% at low temperature. phosphoric and sulphuric acids, at moderate concentrations and temperatures.
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