Reynolds 931 joins our extensive range of high-performance tubing. Based on the stainless 17-4PH/Carpenter Custom 630 chemistry used in applications like aviation and motorsport, Reynolds offer a range of tubes for both the main triangle and rear stays for cycle frames as well as engineering projects.

Key product features:

  • Butted main triangle tubing at 38.1, 34.9, 31.7 ,28.6, 25,4mm diameters in various butt profiles
  • Rear stays available in the range 24.00 -16mm OD, shaped where required
  • Tube wall profiles for both road and ATB designs
  • Suitable for use in lugged, fillet brazed and TIG welded frames
  • Normally supplied pre-aged, ready for fabrication/welding
  • Chemistry and heat-treatment totally compatible with Reynolds 953 alloy and existing parts/fittings including weld wire.
  • Corrosion resistance similar to type 300 Series Stainless steel
  • Plain gauge tubing options for custom projects

Why it works:

UTS: 1200-1350 MPa, density 7.8 gm/cc

931 has a 17% Chromium, 4% Nickel and Copper content, and is designated a stainless steel. When cold-worked and then aged/welded, this alloy cools to form a fine-grained, tough martensitic structure (“precipitate”) which offer builders ductile but strong fabrications.

At around 1300MPa tensile strength depending on heat-treatment, this steel is strong enough to be cold-drawn to tube walls around 0.4mm thick, offering light, competitive frame weights for durable frames with the RIDE OF STEEL.

Note that it is possible to mix both 953 and 931 tubes on a frame allowing builders to meet design, performance and cost parameters for a full stainless steel frame.

Learn More

Click here to download a metal alloys comparison (extract) PDF for designers.