Reynolds 531

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Reynolds 531 is a brand name, registered to Reynolds Cycle Technology of Birmingham in the United Kingdom for a manganese-molybdenum medium carbon steel bicycle tubing. For many years the forefront of alloy steel tubing technology, it has been replaced and superseded by ever more complex alloy mixtures and heat-treatment/cold work cycles as Reynolds has continued to compete with other manufacturers of steel for the bicycle industry. The approximate alloying composition for 531 is 1.5% Mn, 0.25% Mo, 0.35% C, and is similar to the old British BS970 En 16/18 steel. Its mechanical properties and response to heat-treatment are broadly similar to the AISI 4130 standard alloy steel, also used for bicycle frames, amongst other applications.

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