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History of discovery

By the middle of the 19th century it had become clear that constantly increasing metal cutting speeds had a negative effect on the service life of cutters and other metalworking tools. English researcher R.Muchette who made experiments in this sphere found out that by adding extra amount of tungsten to ordinary tool steel it acquires so called red resistance - resistance to increased abrasive effects that is not lost when contact temperatures to 250...³⁰⁰⁰ C increase.

Second half of XIX century

In the second half of 19th century Muchette created several grades of similar steels that had in common the presence of high amounts of carbon (up to 2%), manganese and silicon (up to 1.5%) and tungsten - from 5 to 12%. Such alloys were quenched in air and showed high resistance, but subsequently collapsed brittle. The reason for this failure was also established at that time - the coarse-grained structure that made it impossible to carry out preliminary forging of workpieces. This disadvantage was eliminated by the American metallurgist Taylor, who reduced the percentage of sulfur in Muchette steels and also increased their hardening temperature. Steels equivalent in properties and chemical composition to modern high-speed steels P6, P9, P12 and P18 appeared at the beginning of the 20th century.

Alternative alloys

In recent years, the shortage of tungsten has forced researchers to look for alternatives to this metal. Therefore, tungsten-free fast-cutting steel grades R0M5F1 and R0M3F3 were developed. Features of structure and properties of such steels distinguish them from the general number of tool steels. As high-alloyed these steel alloys are successfully applied as blanks for tool production for both machining and forming. Evek GmbH offers to buy a wide range of high-speed steels at an affordable price. We provide delivery of products anywhere in the continent. The price is optimal.

Features of high-speed steels

In its modern form, high-speed steels have the following features:

• Increased tungsten content, which increases the steel's resistance in conditions of intense abrasive wear and sufficiently high contact temperatures;
• A minimum amount of bound oxygen, which increases mechanical strength;
• The presence of cobalt, which increases the so-called "hot hardness";
• The mandatory pre-tempering before hardening, which makes the structure of high-speed steel alloys more fine-grained and increases their ductility and hardness.

An abundance of alloying elements also gives high-speed steels enhanced corrosion resistance.

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