Alloy Steel

Alloy Steel Product Guide

The term “Chromoly steel” contains a mixture of the words “chromium” and “molybdenum,” which are two of the primary elements that are used in the alloying process. This steel is a form of low alloy steel.

Even though it often comes at a higher price, Chromoly steel is frequently used in situations where it is necessary to achieve a level of tensile strength greater than that of mild carbon steel.

Also, Chromoly comes under the AISI 41xx classifications, and it is necessary to be conscious of the many qualities and uses of Chromoly steel when selecting the appropriate material.

4130 (Chrome moly) Alloy Steel

4130 steel is named after particular rules prescribed by the AISI and SAE. The alloy’s first number identifies the steel’s class and the primary alloying constituent (s). The second number indicates the relative fraction of this alloying element and any other significant secondary elements. The final two figures represent the carbon concentration, rounded to the nearest tenth per cent. In light of these guidelines, 4130 steel is classified as belonging to the 4xxx and 41xx series of chromium-molybdenum steels since it contains around 1% molybdenum and chromium by mass and also contains 0.30% carbon.

However, if you want additional information about the distinctions between the various steels, feel free to go through our post on the many kinds of steels available

4130 (Chrome moly) Normalized Alloy Steel  
Minimum PropertiesUltimate Tensile Strength, psi97,200
Yield Strength, psi63,100
Elongation25.50%
Rockwell HardnessB92
4130 (Chrome moly) Annealed Alloy Steel  
Minimum PropertiesTensile Strength, psi81,200
Yield Strength, psi52,200
Elongation28.20%
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 (Chrome moly) Normalized Alloy Steel  
Minimum PropertiesUltimate Tensile Strength, psi186,000
Yield Strength, psi125,000
Elongation12.20%
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

Alloy 8620 is a case-hardening steel alloyed with nickel, chromium, and molybdenum. The core strength of this alloy is greater than that of grades 8615 and 8617, demonstrating that it has excellent strength and toughness capabilities.
8620 (chrome-nickel-moly) Alloy Steel  
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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