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2. Tempering (metallurgy) - Wikipedia

   en.wikipedia.org/wiki/Tempering_(metallurgy)

   Tempering is also performed on normalized steels and cast irons, to increase ductility, machinability, and impact strength. [3] Steel is usually tempered evenly, called "through tempering," producing a nearly uniform hardness, but it is sometimes heated unevenly, referred to as "differential tempering," producing a variation in hardness. [4]

3. Hollomon–Jaffe parameter - Wikipedia

   en.wikipedia.org/wiki/Hollomon–Jaffe_parameter

   Holloman and Jaffe determined the value of C experimentally by plotting hardness versus tempering time for a series of tempering temperatures of interest and interpolating the data to obtain the time necessary to yield a number of different hardness values. This work was based on six different heats of plain carbon steels with carbon contents ...

4. Differential heat treatment - Wikipedia

   en.wikipedia.org/wiki/Differential_heat_treatment

   The quenched-steel is first sanded or polished, to remove any residual oxidation, revealing the bare metal underneath. The steel is then heated in a localized area, such as the hammering-end of a chisel or the handle-end of an axe. The smith then carefully gauges the temperature by watching the tempering colors of the steel. As the steel is ...

5. 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).

6. Austempering - Wikipedia

   en.wikipedia.org/wiki/Austempering

   Austempering is heat treatment that is applied to ferrous metals, most notably steel and ductile iron. In steel it produces a bainite microstructure whereas in cast irons it produces a structure of acicular ferrite and high carbon, stabilized austenite known as ausferrite. It is primarily used to improve mechanical properties or reduce ...

7. Steel grades - Wikipedia

   en.wikipedia.org/wiki/Steel_grades

   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.