30 November 2022

Alloy Steel

Alloy Steel

Alloy Steel

  • Other elements (besides carbon) can be added to iron to improve mechanical property, manufacturing, or environmental property.
  • Example: sulfur, phosphorous, or lead can be added to improve machine ability.
  1. Generally want to use for screw machine parts or parts with high production rates!
  2. Examples: 11xx, 12xx and 12Lxx
  • Again, elements added to steel can dissolve in iron (solid solution strengthening):
  1. Increase strength, hardenability, toughness, creep, high temp resistance.
  • Alloy steels grouped into low, med and high-alloy steels.

–High-alloy steels would be the stainless steel groups.

–Most alloy steels you’ll use fall under the category of low alloy.   > 1.65%Mn, > 0.60% Si, or >0.60% Cu

  • Most common alloy elements:

Chromium, nickel, molybdenum, vanadium, tungsten, cobalt, boron, and copper.

  • Low alloy: Added in small percent (<5%)

increase strength and hardenability

  • High alloy: Added in large percent (>20%)

 i.e. > 10.5% Cr = stainless steel where Cr improves corrosion resistance and stability at high or low temperature.

 

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