1.4305 / DIN X8CrNiS18-9 – AISI 303 – UNS S30300

1.4305 / AISI 303 is the grade with the best machinability among Austenitics. Its machinability is at 78% and is called automaton of stainless steel. Although the sulfur addition improves machinability, it decreases the corrosion resistance and weakens the formability, especially not suitable for steep bends. Despite the sulfur, its toughness is the same as AISI 304.

The corrosion resistance of AISI 303 material in warm environments is good, but it is lower than AISI 304. The addition of sulfur creates occasional wear. For this reason, it is not recommended for use at seaside or related sectors, because sulfur creates corrosive wear in the cross sections of the internal structure of the material.

AISI 303 quality reacts at the rates shown by AISI 304 in normal conditions and in hot water environments above 60 ° C.

1.4305 / AISI 303 has good oxidation resistance in environments with continuous temperature of 870 ° C, intermittently up to 760 ° C. However, in an environment of 425-860 ° C, carbide precipitation occurs.

After the annealing process is heated between 1010 - 1120 ° C, it is cooled rapidly. It cannot be hardened by heat treatment.

It has poor weldability, so welding is generally not recommended. However, if it is required to be applied, it is recommended to use AISI 308L or AISI 309 quality electrodes. It must be annealed for maximum corrosion after welding.

1.4305, bolt, nut, screw, union, shaft shaft, aircraft fittings, electrical gear elements, used in corrosive environments where AISI 303 is suitable, machine parts with high machining margins.

The information given in this data sheet about the condition or availability of the material is not a guarantee for its properties, it only serves as an explanation. The information provided as advice is consistent with our own experience as well as general experience. No guarantee is given for the processing and application results of the products.