| 摘要 |
<P>PROBLEM TO BE SOLVED: To inexpensively produce a drawn SUS303 steel bar endowed with excellence in surface properties, workability, and cuttability by using conditions in which the SUS303 being an austenitic sulfurized free-machining steel can be prevented from brittle split occurring when it is drawn and it can remain nonmagnetic after it has been drawn. <P>SOLUTION: There is provided a SUS 303 drawn steel bar containing, by mass%, 0.25-0.50% S, which JIS SUS 303 drawn steel bar is characterized in that the tensile strength is 80-95% when compared with that attained in the case of cold drawing, the relative magnetic permeability is 1.05 or less, and the hydrogen content is 10 ppm or less. Also provided is a method for production thereof comprising the steps of: preceding to drawing, heating a starting stock steel containing 0.25-0.50%, by mass%, S at a temperature of from ≥35°C to below 80°C and subsequent to the heating, drawing the heated stock steel at a temperature of from ≥35°C to below 80°C at an area reduction rate of 10-50%. <P>COPYRIGHT: (C)2013,JPO&INPIT |
