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Very hard steel (e.g. chisels, quality knife blades): HRC 55–66 (Hardened High Speed Carbon and Tool Steels such as M2, W2, O1, CPM-M4, and D2, as well as many of the newer powder metallurgy Stainless Steels such as CPM-S30V, CPM-154, ZDP-189. There are alloys that hold a HRC upwards 68-70, such as the Hitachi developed HAP72.
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A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .
If a low-carbon steel is only stressed to some point between the upper and lower yield point then the surface develops Lüder bands. [7] Low-carbon steels contain less carbon than other steels and are easier to cold-form, making them easier to handle. [3] Typical applications of low carbon steel are car parts, pipes, construction, and food cans ...
S1, a medium-carbon shock-resisting steel tool steel which combines moderate hardness with good impact toughness. Carbon content 0.40 - 0.55%. [11] W1, a water hardening tool steel. High carbon content. W2, a tool steel that holds its edge quite well but is not very tough.
For example, a 1060 steel is a plain-carbon steel containing 0.60 wt% C. [4] An "H" suffix can be added to any designation to denote hardenability is a major requirement. The chemical requirements are loosened but hardness values defined for various distances on a Jominy test. [3]
4340 steel is an ultra-high strength steel classified a medium-carbon, low-alloy steel. 4340 steel has high strength, ductility, toughness, creep resistance, and fatigue resistance relative to most other steels. Hardness ranging from 24 to 53 HRC can be achieved, depending on the heat treatment.
Below is a table comparing steel grades from different grading systems. ... Carbon steels 1.1141 1.0401 1.0453: C15D C18D: 1010 1018: CK15 C15 C16.8: 040A15 080M15 080A15
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