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Tool Steels: A Brief History — Part 1 Introduction

For many years a great air of mystery surrounded the selection, heat treatment and use of tool steels. Perhaps this was due to the secretiveness of the early steel-makers. However, it may also have been fostered by the jargon and spiel of commercial marketing, and the seemingly endless parade of ‘new’ types and grades of “high speed steel”. To a certain extent this may still be true today.

Tool Steels: A Brief History — Part 2 Introduction to high speed steel

The term “high speed steel”, or HSS, is derived from the fact that such steel is capable of cutting metal at a much higher speed than ordinary carbon tool steels. The reason for this performance characteristic is that it has a special property known as “red hardness” meaning that the steel is able to retain its hardness even when heated to dull red and so retains its cutting qualities.