chromoly
Subscript text
| Iron alloy phases |
|---|
|
Austenite (γ-iron; hard) |
| Types of Steel |
|
Plain-carbon steel (up to 2.1% carbon) |
| Other Iron-based materials |
|
Cast iron (>2.1% carbon) |
Chromoly is an abbreviation for "chromium-molybdenum steel" (sometimes spelled "cro-mo"). Chromoly is a range of low alloy steels used, for example, to produce tubing for bicycle frames and race-car 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 chromoly steels is 4130 steel, composed of 0.28 to 0.33% carbon, 0.4 to 0.6% manganese, 0.8 to 1.1% chromium, 0.15 to 0.25% molybdenum, 0.04% phosphorus, 0.04% sulfur, and 0.2 to 0.35% silicon, in addition to iron.
Although chromoly contains chromium, it does not have the corrosion resistance of stainless steel.
Chromoly is the best material used to make BMX bicycle frames due to its high tensile strength and high weight to strength ratio. 4140 is a little bit more durable and used to make mostly BMX pegs for grinds.
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