From Material Dictionary

Free Machining
Pertains to the machining characteristics of an alloy to which one or more ingredients have been introduced to produce small broken chips, low power consumption, better surface finish or longer tool life.

Free Machining
Pertains to the machining characteristics of an alloy to which an ingredient has been introduced to give small broken chips, lower power consumption, better surface finish, and longer tool life; among such additions are sulfur or lead to steel, lead to brass, lead and bismuth to aluminum, and sulfur or selenium to stainless steel.

Example Here...
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COLUMBIA 325 is a uniquely British free machining grade of austenitic stainless steel with a machinability rating some 50% better than grade 316 austenitic stainless steel. The addition of sulphur gives the alloy its free cutting properties. Grade 325 is also titanium stabilized to give improved weldability through restriction of carbide precipitation. It exhibits the recognised corrosion resistant qualities of normal austenitic grades and is substantially non-magnetic.

COLUMBIA 325 is ideal for more intricate machining operations and finds application in all types of fasteners and other machined parts for chemical, petrochemical plant, magnetically sensitive instrumentation, and many areas of application making best use of its intrinsic resistance to galling and seizure.


이진희님의 글
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제목 그대로 입니다.
Material 관련 Spec.이나 Code를 보다 보면 재료 뒤에 첨부되는 문장이 Free-Machining Grade 라고 표기된 것이 있습니다.
이러한 재료의 사용을 많은 영역에서 제한하고 있는 데, 정작 이말의 정확한 의미를 찾을 수 없습니다.

예) Free-Machining Grade Material shall not be used.

도움을 기다립니다.