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2. 41xx steel - Wikipedia

   en.wikipedia.org/wiki/41xx_steel

   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).

3. SAE steel grades - Wikipedia

   en.wikipedia.org/wiki/SAE_steel_grades

   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. These efforts were similar ...

4. Steel grades - Wikipedia

   en.wikipedia.org/wiki/Steel_grades

   Where x is the material type (only 1 is specified so far), yy is the steel group number (specified in EN10027-2) and zz(zz) is a sequential number designated by the certifying body, the number in brackets being unused but reserved for later use. The steel groups are indicated below:

5. List of blade materials - Wikipedia

   en.wikipedia.org/wiki/List_of_blade_materials

   [citation needed] Böhler n695 is equivalent to 440C. [citation needed] Knife blades specified as being "440" can typically be assumed to be the lower-hardness 440A grade. [citation needed] AUS series. The AUS stainless steel series is produced by Aichi Steel Corporation of Japan. They differ from the AISI 4xx series because they have vanadium ...

6. Engineering drawing abbreviations and symbols - Wikipedia

   en.wikipedia.org/wiki/Engineering_drawing...

   AISI: American Iron and Steel Institute: The AISI acronym is commonly seen as a prefix to steel grades, for example, "AISI 4140". The SAE steel grade system was formerly a joint AISI-SAE system. Al or AL: aluminium: ALY: alloy: AMER: American: Referring to the United States: AMS: Aerospace Material Standards

7. Martensite - Wikipedia

   en.wikipedia.org/wiki/Martensite

   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]

8. 4340 steel - Wikipedia

   en.wikipedia.org/wiki/4340_steel

   The mechanical properties of 4340 are highly dependent on the heat treatment. 4340 can commonly have yield strengths of 740-1860 MPa, tensile strengths of 860-1980 MPa, elongations of 11-23%, and plane strain fracture toughness of 53-110 MPa√m.

9. Free machining steel - Wikipedia

   en.wikipedia.org/wiki/Free_machining_steel

   Free machining steels are carbon steels that have sulfur, lead, bismuth, selenium, tellurium, or phosphorus added. Sulfur forms the compound manganese sulfide, which is soft and acts as a chip-breaking discontinuity.