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Reynolds 531 (pronounced 'five-three-one') is a brand name, registered to Reynolds Technology of Birmingham in the United Kingdom, for a manganese–molybdenum, medium-carbon steel tubing that was used in many quality applications, including race car chassis, aircraft components and, most famously, bicycle frame tubing.
A Reynolds 531 special lightweight race frame. Reynolds has over the years developed a number of steel alloys, most notably Reynolds 531, which has a high strength and can be made into strong, but lightweight tubes for bicycle frames.
16-gauge Reynolds 531, a high-tensile manganese-molybdenum steel alloy, was used as it allowed the frame tubes to be made thinner for the same strength, as well as making for a more responsive frame. All the joints were Sifbronze welded, [ 27 ] [ 28 ] – a relatively low-temperature flame-braze – except for the sub frame which was initially ...
One of the most successful older steels was Reynolds "531", a manganese-molybdenum alloy steel. More common now is 4130 ChroMoly or similar alloys. Reynolds and Columbus are two of the most famous manufacturers of bicycle tubing. A few medium-quality bicycles used these steel alloys for only some of the frame tubes.
Both frames were constructed of Reynolds 531 steel tubing (in French metric sizes), typical of the high-end bicycle during this era of manufacture. The front forks of later Mondia frames featured Bocama semi-sloping chrome-plated investment cast fork crowns with Mondia stamped into the shoulders on each side.
By the early 1970s, the 21 lb PX-10E used a frame made with Reynolds 531 manganese-molybdenum (MnMo) double-butted steel tubing and was fitted with lightweight aluminum alloy (Stronglite, Mafac, and Simplex) components, though by the mid-1980s it was upgraded to Campagnolo Nuovo Record crankset/pedals, derailleurs, and headset. The PX-10E was ...
The Doretti had a tubular Reynolds 531 manganese–molybdenum, medium-carbon steel chassis. Reynolds was another member of the T.I. Group. The double-skinned body had an inner structural skin made of steel and an aluminium outer skin. Power came from a 1,991 cc (121.5 cu in) Standard wet liner inline-four engine.
Reynolds 531; Silicon steel ; Spring steel; Stainless steel (chromium, nickel) AL-6XN; Alloy 20; Celestrium; Marine grade stainless; Martensitic stainless steel; Alloy 28 or Sanicro 28 (nickel, chromium) Surgical stainless steel (chromium, molybdenum, nickel) Zeron 100 (chromium, nickel, molybdenum) Tool steel (tungsten or manganese)