HSS steel: which lead to overheating of the gasoline or diesel engine, brands and symbols

Abbreviation for HSS, composed of the initial letters of the English words High Speed ??Steel, affects a whole group of steels, belonging to the category of high-speed. Mills are made of steels of this type, taps, dies for carving. Much less often this material is used for the production of hacksaw blades and knives.

HSS alloys are high carbon steel, some brands may contain significant amounts of tungsten. Hardness of the tool, made of steels of this type, may be in the interval 62-64 units on the HRC scale.

The final cutter, made ??made of HSS-Co8 steel is capable of processing material with a tensile strength of up to 1100N / mm2

HSS steel tools, if you compare them with carbides, are more affordable and more durable, which allows you to successfully use them for intermittent cutting. Meanwhile, it is allowed to perform processing with them at lower cutting speeds, compared to carbide drills.

The composition of high-speed steels, which foreign manufacturers call HSS alloys, constantly improving. So, from the end of the XIX century in such steels began to add a significant amount of tungsten (to 18%), and with 1912 year in these alloys began to appear cobalt. And only in 1930 year in the HSS-steels included molybdenum.

Main characteristics and brands

Depending on their composition, HSS steels are divided into three categories:

• with high tungsten content (T);
• molybdenum (M);
• high-alloy group.

Chemical composition of tungsten HSS steels

Due to the high cost and lack of tungsten steel with its high content in our time are used quite rarely. The most common steels of this group are general purpose alloy T1 and contains vanadium and cobalt steel alloy T15. The latter is used, in particular, for the manufacture of products, which must be highly resistant to wear and high temperatures.

Chemical composition of molybdenum HSS steels

HSS molybdenum group became more widespread, which may also contain tungsten and cobalt. High-speed steel molybdenum group, which contain a significant amount of vanadium and carbon, resistant to abrasive wear. For the manufacture of products, which must maintain high hardness even at high temperatures, molybdenum steel alloys are used, starting from the M41 brand. In the manufacture of tools, which are operated in cold conditions and have high impact strength, also use steel alloys of molybdenum group, subjecting them to special heat treatment.

Chemical composition of high-alloy HSS steels

Choosing tools from HSS-steels of molybdenum group, the characteristics of individual grades of such steel alloys should be taken into account.
M1

HSS-drills of wide application are made of steel of this brand. HSS drills made of M1 alloy are more flexible and less susceptible to shock loads, but the level of their redness is less, than tools, made of M2 steel.

M2

This is the most common material, from which tools for various purposes are made. HSS-steel products of this brand, which are used to perform high-performance machine work, differ in high redness resistance, the parameters of their cutting edges are stored longer, than tools from high-speed steels of other brands.

M7

This alloy is used for the production of powerful drills, which require not only high flexibility, but also exceptional reliability. By means of drills on HSS metal, made of an alloy of this brand, make holes in solid and thick sheet material.

M50

This is material, which is used to make drills, which work complete with portable equipment. In these conditions, the breakage of the tool due to its significant bending is a very important problem. The HSS drill from M50 steel alloy does not possess such redness resistance, as tools from high-speed steels of other brands.

M35

This alloy, which is also referred to as HSSE, due to the high content of cobalt has a higher redness, than high-speed steel grade M2. Meanwhile, the high content of this element in the HSSE steel reduces its resistance to shock loads.