The cutting tool produces strong wear and heat under working conditions, as well as vibration and bearing a certain impact load. Steel for cutting tools should have high hardness, wear resistance, red hardness and good toughness. In order to ensure its high hardness and meet the needs of forming alloy carbide, the carbon content of steel is generally between 0.80% and 1.45%. Chromium is the main alloy element of this kind of steel, and its mass fraction is usually between 0.50% and 1.70%. Some steel also contains tungsten to improve the performance of cutting metal. This kind of tool steel contains alloy elements, so its hardenability is better than that of carbon tool steel, the deformation caused by heat treatment is smaller, and it has high hardness and wear resistance. Commonly used steel class has chromium steel, silicon chrome steel and chrome tungsten manganese steel.
[applications] : mainly used in the manufacture of low speed cutting cutting tool (e.g., woodworking tools, bench tools, drill bits, milling cutter, broach, etc.) and measuring tools, such as caliper, micrometer, gauge block, templates, etc.). Measuring tool steel requires high hardness (62 ~ 65HRC), high abrasion resistance, sufficient toughness and high thermal hardness (i.e. the tool can still maintain high hardness at high temperature). In order to ensure the accuracy of measurement, good dimensional stability of tool steel is required.
[chemical composition] : measuring tool steel has high carbon content, wC=0.8% ~ 1.50%, to ensure high hardness and wear resistance. The alloy elements added include Cr, Si, Mn, W, etc., which are used to improve the hardenability, tempering resistance, thermal hardness and wear resistance of steel.
[commonly used tool steel] : 9SiCr is widely used tool steel. It is used to make various thin blade low-speed cutting tools with small deformation, such as die, tap, reamer, etc.
[common gauge steel] : high precision gauge (such as block gauge) can be made from steel cutting tools such as Cr2 and CrWMn, or from bearing steel such as GCr15. Simple measuring tools (such as caliper, sample, ruler, gauge, etc.), multi-purpose carbon tool steel (such as T10A); Stainless steel 3Cr13, 9Cr18 are used for measuring tools that require precision and need to prevent corrosion.
[heat treatment] : the preheat treatment of measuring tool steel is spheroidized annealing, and the final heat treatment is quenching and tempering at low temperature, and the hardness is up to 60-65hrc after heat treatment. High precision measuring tools can be cooled after quenching to reduce the residual austenite volume and thus increase dimensional stability. In order to further improve dimensional stability, aging treatment can be carried out after quenching and tempering.
Those material are widely used in wood cutting knife for veneer slicing,
Ice resurfacing blade, shredder knife and many machine knives.
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