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Steels. High-speed steel (HSS or HS) is a subset of tool steels, commonly used as cutting tool material. It is superior to high- carbon steel tools in that it can withstand higher temperatures without losing its temper (hardness). This property allows HSS to cut faster than high carbon steel, hence the name high-speed steel.
The SAE steel grades system is a standard alloy numbering system (SAE J1086 – Numbering Metals and Alloys) for steel grades maintained by SAE International. In the 1930s and 1940s, the American Iron and Steel Institute (AISI) and SAE were both involved in efforts to standardize such a numbering system for steels.
AISI-SAE tool steel grades [21] Defining property AISI-SAE grade Significant characteristics Water-hardening W Cold-working O Oil-hardening A Air-hardening; medium alloy D High carbon; high chromium Shock resisting S High speed T Tungsten base M Molybdenum base Hot-working H H1–H19: chromium base H20–H39: tungsten base H40–H59: molybdenum ...
In addition to the descriptive steel grade naming system indicated above, within EN 10027-2 is defined a system for creating unique steel grade numbers. While less descriptive and intuitive than the grand names they are easier to tabulate and use in data processing applications. The number is in the following format: x.yyzz(zz)
Maraging steels (a portmanteau of "martensitic" and "aging") are steels that are known for possessing superior strength and toughness without losing ductility. Aging refers to the extended heat-treatment process. These steels are a special class of very-low- carbon ultra-high-strength steels that derive their strength not from carbon, but from ...
CPM REX 54 HS [51] is a cobalt-bearing high-speed steel designed to offer an improvement in the red hardness of the popular M4 grade while maintaining wear properties equivalent to M4. CPM REX 66 (HSS) [52] is super high-speed steel made by the CPM process.
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