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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).
If followed by T then the given mechanical property is minimum tensile strength D: ... AISI/SAE grade (USA) UNS (USA) DIN ... 4140/4142: 41CrMo4 42CrMo4 42CrMoS4 43CrMo4:
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.
The AISI acronym is commonly seen as a prefix to steel grades, for example, "AISI 4140". ... is a common non-SI measurement scale for ultimate tensile strength, ...
Mild steel has a relatively low tensile strength, but it is cheap and easy to form. ... 4140 steel; 4145 steel; 4340 steel. ... but AISI's definition of carbon steel ...
Maraging steels are usually described by a number (e.g., SAE steel grades 200, 250, 300 or 350), which indicates the approximate nominal tensile strength in thousands of pounds per square inch (ksi); the compositions and required properties are defined in US military standard MIL-S-46850D. [10]
Martensite in AISI 4140 steel 0.35% carbon steel, water-quenched from 870 °C. Martensite is a very hard form of steel crystalline structure. It is named after German metallurgist Adolf Martens. By analogy the term can also refer to any crystal structure that is formed by diffusionless transformation. [1]
Typical values of the limit for steels are one half the ultimate tensile strength, to a maximum of 290 MPa (42 ksi). For iron, aluminium, and copper alloys, S e {\displaystyle S_{e}} is typically 0.4 times the ultimate tensile strength.