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The early 1940’s witnessed the development of a coding system for the classification of different types of steels. Designers, heat treaters, draftsmen, and engineers were able to obtain specific information on the types of steel along with its grades.
Tool steels are high-quality, carbon and alloy steels that are commonly used to make cutters, reamers, bits etc used for machining metals, plastics, and wood. They are usually melted in furnaces and processed to give them properties required for shaping other metals into useful components.
Water-hardening tool steels, also known as group W steels, comprise the W1, W2, and W3 types. Carbon is the main alloying element found in group W steels. Water-hardening steels are produced with different nominal carbon contents ranging from 0.60 to 1.40%.
The American Iron and Steel Institute (AISI) classification system has designated the letter ‘P’ to refer to mold steels or Group P steels. The main alloying elements in the mold steels are chromium and nickel.
According to the AISI classification system, low alloy special-purpose steels are designated Group L steels. Low alloy special-purpose steels contain small quantities of chromium, nickel, vanadium, and molybdenum. In the past, the low alloy special-purpose steels comprised seven grades of steels.
Hot work tool steels are steels capable of withstanding high abrasion, heat and pressure conditions that prevail in manufacturing units that perform processes such as forming, shearing and punching of metals at high temperatures of 480 to 760°C.
By Reginald Davey
9 Jul 2012
High-speed steels are tool steels that find applications in high-speed cutting tools. Tungsten high-speed steels (group T) and molybdenum high-speed steels (group M) are two types of high-speed steels. These two groups of high-speed steels have similar hardening abilities and other characteristics.