Development of a leaded free-machining austenitic stainless steel has been tried. The main results obtained are as follows.
(1) The hot workability of the leaded free-machining austenitic stainless steel is greatly improved by controling N and adding about 50ppm B. The improved hot workability is equivalent to that of SUS304 steel.
(2) The corrosion resistance of the newly developed free-machining stainless steel, 304FL, is much better than that of SUS303 steel and comparable to that of SUS304 steel.
(3) The machinability of 304FL is far beyond SUS304 steel and equal to SUS303 steel containing 0.2%S.
(4) 304FL steel has a good cold forgeability and can be rightly cold-headed as SUS304 steel.
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