High speed steel's are alloy steels designed to act as high speed cutting tools; so although they get red hot at the cutting edgethey continue to cut..Typically they contain 1% or more of carbon with very high percentages of Chromium/tungsten/molybdenum/vanadium(el... that form hard,stable carbides) so that unlike the ordinary engineering alloy steels which are generally more than 95%iron,the high speed steels might contain no more than 50% of iron,the rest being Cr/ W/Mo/Va.Such high speed steels are hardened by quenching from temperatures greater than 1300 degrees centigrade,temperatures which would render ordinary alloy steel unusable.Generally the high speed steel tool is quite small and brazed or copper welded to a toolholder whick acts as a heat sink.In modern technology many highspeed tool applcation are being taken over by cermets(ceramic/metal designs)
[
展开]
[
关闭]
我来回答
0861803284
0861788249
