EN 1.4305 is a free-machining austenitic stainless steel. The excellent machinability is due to its sulphur content of between 0,15 - 0,30 %. It has good resistance to atmospheric corrosion and to many organic and inorganic chemicals. It is non-magnetic in the annealed condition but may become slightly magnetic due to the introduction of martensite or ferrite at the cold-working or welding stages. Design features
⇒ Relatively good corrosion resistance
⇒ Excellent machinability Corrosion resistance
EN 1.4305 has relatively good resistance to atmospheric corrosion with some restrictions particularly regarding marine and coastal environments. Also the grade has a good resistance to many (mildly corrosive) organic and inorganic chemicals. Somewhat less corrosion resistance compared to EN 1.4307 due to the addition of sulphur. Residuals of cutting fluid must be removed by a degreasing process and the surface need to be passivated after machining, to achieve better corrosion resistance.
EN 1.4305 is sensitive to intergranular corrosion due to grain boundary precipitation of chromium carbides, which can occur in the temperature range 550 - 850ºC. The resistance to pitting and crevice corrosion is low to moderate. These types of corrosion typically occur in acidic, neutral or slightly alkaline solutions and in media with a low chloride content. The grade EN 1.4305 is susceptible to stress corrosion cracking. Critical service conditions, i.e. applications subjected to combinations of tensile stress, temperatures above about 50ºC and solutions containing chlorides, should be avoided.
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