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2. Carbon steel - Wikipedia

   en.wikipedia.org/wiki/Carbon_steel

   A hypoeutectoid carbon steel (carbon composition smaller than the eutectoid one) is heated to approximately 30 to 50 °C (86 to 120 °F) above the austenictic temperature (A 3), whereas a hypereutectoid steel is heated to a temperature above the eutectoid one (A 1) for a certain number of hours; this ensures all the ferrite transforms into ...

3. 4340 steel - Wikipedia

   en.wikipedia.org/wiki/4340_steel

   4340 steel is an ultra-high strength steel classified a medium-carbon, low-alloy steel. 4340 ... The mechanical properties of 4340 are highly dependent on the heat ...

4. Steel grades - Wikipedia

   en.wikipedia.org/wiki/Steel_grades

   Steel specified by purpose of use and mechanical properties. Steel specified by chemical composition. ... Carbon steels 1.1141 1.0401 1.0453: C15D C18D: 1010 1018 ...

5. Tool steel - Wikipedia

   en.wikipedia.org/wiki/Tool_steel

   0.60–0.75% carbon: machine parts, chisels, setscrews; properties include medium hardness with good toughness and shock resistance. 0.76–0.90% carbon: forging dies, hammers, and sledges. 0.91–1.10% carbon: general purpose tooling applications that require a good balance of wear resistance and toughness, such as rasps, drills, cutters, and ...

6. Alloy steel - Wikipedia

   en.wikipedia.org/wiki/Alloy_steel

   The properties of steel depend on its microstructure: the arrangement of different phases, some harder, some with greater ductility. At the atomic level, the four phases of auto steel include martensite (the hardest yet most brittle), bainite (less hard), ferrite (more ductile), and austenite (the most ductile). The phases are arranged by ...

7. Hardened steel - Wikipedia

   en.wikipedia.org/wiki/Hardened_steel

   Depending on the temperature and composition of the steel, it can be hardened or softened. To make steel harder, it must be heated to very high temperatures. The final result of exactly how hard the steel becomes depends on the amount of carbon present in the metal. Only steel that is high in carbon can be hardened and tempered.