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41xx steel is a family of SAE steel grades, as specified by the Society of Automotive Engineers (SAE). Alloying elements include chromium and molybdenum, and as a result these materials are often informally referred to as chromoly steel (common variant stylings include chrome-moly, cro-moly, CrMo, CRMO, CR-MOLY, and similar).
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.
4140/4142: 41CrMo4 42CrMo4 42CrMoS4 43CrMo4: 708M40 708A42 709M40 En19 En19C: 41CrMo4 38CrMo4 (KB) G40 CrMo4 42CrMo4: SCM 440 SCM 440H SNB 7 SCM 4M SCM 4 1.6582 1.6562: 34CrNiMo6: 4340: 34CrNiMo6 40NiCrMo8-4: 817M40 En24: 35NiCrMo6 (KB) 40NiCrMo7 (KB) SNCM 447 SNB24-1-5 1.6543 1.6523: 20NiCrMo2-2: 8620: 21NiCrMo22 21NiCrMo2: 805A20 805M20 ...
A Rockwell hardness tester. The Rockwell hardness test is a hardness test based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [1]
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 .
The strain hardening exponent (also called the strain hardening index), usually denoted , is a measured parameter that quantifies the ability of a material to become stronger due to strain hardening. Strain hardening (work hardening) is the process by which a material's load-bearing capacity increases during plastic (permanent) strain , or ...
Abrasion resistant steel undergoes a two-step heat treatment process called quenching and tempering, which alters the steel's grain structure to increase hardness and toughness. [ 2 ] During the quenching phase, the steel is heated to an above-critical temperature and is then rapidly cooled with water.
The cooling rate will be highest at the end being quenched, and will decrease as distance from the end increases. Subsequent to cooling a flat surface is ground on the test piece and the hardenability is then found by measuring the hardness along the bar. The farther away from the quenched end that the hardness extends, the higher the ...
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