Steel Alloy Designation - The Trident Company

1 (B) Acid Bessemer Carbon Steel (E) Electric Furnace SteelSeries DesignationKey Alloying Elements10xxPlain Carbon (Mn max)11xxResulfurized12xxResulfurized and Rephosphorized15xxPlain Carbon (Mn to )13xxManganese - Chromium or - Chromium - Chromium or - Chromium 40xxMolybdenum or or , or - Molybdenum , , or - Chromium or - Molybdenum - Chromium - Molybdenum or - Chromium - Molybdenum - Chromium - Molybdenum - Chromium - Molybdenum - Chromium - Molybdenum - Chromium - Molybdenum - Chromium - Molybdenum - Chromium - Molybdenum - Chromium - Molybdenum or - Molybdenum or - Molybdenum or or or or or or or - Carbon min51xxxChromium - Carbon min52xxxChromium - Carbon min4.

2 The last digits indicate the approximate middle of the carbon content range in percent. For example, indicates a range of to percent carbon. In a few cases, the system deviates from this rule, and some carbon ranges relate to the ranges of manganese, sulfur, phosphorous, chromium, and other elements. Steel Alloy DesignationStandard Designation System for Steel1. Numbers are used to designate different chemical compositions. A four digit number series designates carbon and alloying steels according to the types and classes. This system has been expanded, and in some cases five digits are used to designate certain Alloy Letters are often used as a prefix to the numerals. No Prefix for basin open hearth Alloy Steel (C) Basin open hearth Carbon Steel (H) Steels manufactured to meet hardenability limits3.

3 The first two digits indicate the major alloying metals in - Chromium - Molybdenum SteelsNickel-Molybdenum SteelsChromium SteelsCarbon SteelsManganese SteelsNickel SteelsNickel - Chromium SteelsMolybdenum SteelsChromium - Molybdenum (Chromoly) Steels61xxChromium or or - Vanadium or min72xxTungsten - Chromium or - Manganese or or - Chromium or SAE gradesxxBxxBoron steelsxxLxxLeaded steelsAxCold working, air hardening, medium alloyDxCold working, high carbon, high chromiumFxSpecial purpose, carbon tungstenHxHot working, H1-H19-Chromium base, H20-H39-Tungsten base, H40-H59-Molybdenum baseLxSpecial purpose, low alloyMxHigh speed, molybdenum baseOxCold working, oil hardeningPxPlastic moldSxShock resisting, tungsten baseTxHigh speed, tungsten baseWxWater hardeningHigh-Strength Low- Alloy SteelsTool SteelsTool Steels are wear resistant, ferrous alloys based on iron and carbon with high levels of alloying (hardenability and property modifying) elements such as chromium, molybdenum, tungsten, and vanadium.

4 Specific tool Steel grades are available for die or cold work, hot work, high speed and shock resistance applications. Tool Steel alloys are used in a wide variety of applications that require wear SteelsTungsten-Chromium SteelsSilicon-Manganese Steels