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Alloy Steel Product Guide

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Chrome moly is an abbreviation for "chromium-molybdenum steel" (sometimes spelled "cro-mo"). Chrome moly is a range of low alloy steels used, for example, to produce tubing for bicycle frames and racecar roll cages. It is not as lightweight as aluminum alloys, but has the advantages of high tensile strength and malleability. It is also easily welded and is considerably stronger and more durable than standard 1020 steel tubing.

One of the most common chrome moly steels is 4130. 4130 chrome moly is an ideal material for BMX bicycle frames and firearms receivers because of its high tensile strength and high strength-to-weight ratio.

Although chrome moly contains chromium, it does not have the corrosion resistance of stainless steel.

4130 (Chrome moly) Alloy Steel (available in Round, Sheet, Tube)
4340 (Chrome moly) Alloy Steel (available in Round)
8620 (Chrome moly) Alloy Steel (available in Round, Round)

4130 (Chrome moly) Normalized Alloy Steel

Minimum Properties

Ultimate Tensile Strength, psi 97,200
Yield Strength, psi 63,100
Elongation 25.5%
Rockwell Hardness B92


4130 (Chrome moly) Annealed Alloy Steel

Minimum Properties

Tensile Strength, psi 81,200
Yield Strength, psi 52,200
Elongation 28.2%
Rockwell Hardness B82


Iron (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 Properties

Ultimate Tensile Strength, psi 186,000
Yield Strength, psi 125,000
Elongation 12.2%
Rockwell Hardness B100


Iron (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

Minimum Properties

Tensile Strength, psi 97,000
Yield, psi 57,000
Brinell Hardness 201
Elongation 25%
Machinability 66%


Carbon (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

Alcobra Metals states that all technical data is for comparison purposes only and is NOT FOR DESIGN. It has been compiled from sources we believe to be accurate but cannot guarantee. Please consult an Engineer.

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4510 North Freya Phone 509 482 4435   Fax 509 482 4512   Toll Free 800 239 5608
Spokane, Washington 99217 E-mail:

Alcobra Metals is the online metal store for small quantity metal orders including metal orders by phone and complete metal sales and support. Alcobra Metals' wide selection of industrial metals includes aluminum, copper, brass, stainless steel, bronze, hot roll steel, cold roll steel, titanium, tool steels, and composit products. Alcobra Metals specializes in cut-to-length materials. You buy only what you need. There are no minimum orders. Same day UPS shipping for orders by noon.