Alloy Steel Properties – Video

To the untrained eye, metal is metal. It may be shiny or dull. It may be smooth or mottled. But when you dive into the world of materials you learn there are many unique qualities for each metal. Learning about the Alloy Steel properties is a great place to begin uncovering what makes each metal unique.
Alloy Steel properties (also known as “Chromoly”) determine what types of applications the metal is best suited for. Watch this quick video to learn what types of projects might call for Alloy Steel.

ALLOY STEEL PROPERTIES REFERENCE GUIDE

4130 (Chromoly) Normalized Alloy Steel Properties

Minimum PropertiesUltimate Tensile Strength, psi97,200
Yield Strength, psi63,100
Elongation25.5%
Rockwell HardnessB92
4130 (Chromoly) Annealed Alloy Steel
Minimum PropertiesTensile Strength, psi81,200
Yield Strength, psi52,200
Elongation28.2%
Rockwell HardnessB82
ChemistryIron (Fe)97.3 – 98.22%
Carbon (C)0.28 – 0.33%
Chromium (Cr)0.8 – 1.1%
Manganese (Mn)0.4 – 0.6%
Molybdenum (Mo)0.15 – 0.25%
Phosphorus (P)0.035% max
Sulphur (S)0.04% max
Silicon (Si)0.15 – 0.35%

 

4340 (chromoly) Normalized Alloy Steel Properties
Minimum PropertiesUltimate Tensile Strength, psi186,000
Yield Strength, psi125,000
Elongation12.2%
Rockwell HardnessB100
ChemistryIron (Fe)96%
Carbon (C)0.37 – 0.43%
Chromium (Cr)0.7 – 0.9%
Manganese (Mn)0.7% max
Molybdenum (Mo)0.2 – 0.3% max
Nickel (Ni)1.83%
Phosphorus (P)0.035% max
Sulphur (S)0.04% max
Silicon (Si)0.23%

 

8620 (chrome-nickel-moly) Alloy Steel Properties
Minimum PropertiesTensile Strength, psi97,000
Yield, psi57,000
Brinell Hardness201
Elongation25%
Machinability66%
ChemistryCarbon (C)0.18 – 0.23%
Manganese (Mn)0.7 – 0.9%
Phosphorus (P)0.35% Max
Sulphur (S)0.4% Max
Silicon (Si)0.15 – 0.35%
Chromium (Cr)0.4 – 0.6%
Nickel (Ni)0.4 – 0.7%
Molybdenum (Mo)0.15 – 0.25% max

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