Reynolds 531

Discussion in 'Bicycle Mechanics and Repairs' started by jimn8, 11 Oct 2009.

  1. jimn8

    jimn8 New Member

    The frame of my bike of 5 years has a decal Reynolds 531 Exclusive Millennium Design. Does any one have any information about this frame tubing:?:
     
  2. Hacienda71

    Hacienda71 Mancunian in self imposed exile in leafy Cheshire

    Location:
    Wilmslow, Cheshire
    Reynolds 531 is a good quality tubing used by a lot of frame builders. It is a steel carbon mix. Should be a reasonable frame if made out of this.
     
  3. OP
    OP
    jimn8

    jimn8 New Member

    It is the "Exclusive Millennium Design" that I should like to know more about!
     
  4. MajorMantra

    MajorMantra Well-Known Member

    Location:
    Edinburgh
    That'll be some manufacturer's marketing spiel for some particular 'edition' of the bike. What brand is it?

    Matthew
     
  5. Hover Fly

    Hover Fly Lover of the bunny

    As I recall Millenium was a version with short butts specially for welding instead of brazing.
     
  6. OP
    OP
    jimn8

    jimn8 New Member

    Thanks for the information!
     
  7. brodie

    brodie New Member

    I thought 531 can't be welded, ie welding temperature is too high for 531.
     
    gilespargiter likes this.
  8. asterix

    asterix Comrade Member

    Location:
    Limoges or York
    I don't understand why it would be useful (or even possible) to weld 531 instead of using lugs or fillet brazing?
     
  9. 02GF74

    02GF74 Über Member

    surely lugs are heavier? it is possible to weld steel, may saracent mountain bike is welded - not 530 tubing but pretty sure it'll be butted (is ne of their top frames back in the days before they started to make shitty full suspension bikes)
     
  10. alecstilleyedye

    alecstilleyedye nothing in moderation Moderator

    my wife's cro-mo frame is welded. odd shaped flat tubing, probably to look like alu…
     
  11. brodie

    brodie New Member

    Obviously, steel can be welded but 531 steel has to be brazed because brazing has a lower temperature than welding. The higher welding temperature would weaken 531 too much.

    Other steels such as 853 are designed to be welded.

    If this "Exclusive Millennium Design" 531 frame is actually welded then it would also have much thicker walls at the tube ends to make up for the loss of strength from welding. Tubing designed for welding can have shorter butts because of the smaller heat affected zone.
     
    gilespargiter likes this.
  12. biggs682

    biggs682 Smile a mile bike provider

    Location:
    Northamptonshire
    i have just found this old thread whilst doing some research re 531 Millenium tubing as not 1 i had heard of before .... watch this space
     
  13. Not sure what new info there is to be added. It was a custom-drawn tubeset specifically for welding purposes, as stated earlier. Three years earlier, in fact....
     
  14. Kernowdreamer

    Kernowdreamer Active Member

    Location:
    southampton
    Resurrecting this as a result of researching 531 Millenium.
    The reason regular 531 isn't welded is not because of any difference in the composition of the metal. It is because it is drawn to such thin sections that welding would introduce too much heat into the joints, distort the material and cause stress points and missalignment of the finished frame.
    531 Millenium would appear to have shorter thicker butted sections to alleviate this issue without raising the weight of the tubeset significantly.
     
    Last edited: 1 May 2018
    3narf, Gravity Aided and raleighnut like this.
  15. Makes sense,@Kernowdreamer , let alone that thin walled tubing may be more difficult to weld without blowing holes in it. I originally thought "Millenium Tubing" may have been commemorative, like "Anniversary" tubing decals from 1985.
    reynolds-531-tubing-sticker-50th-anniversary_edited-1.jpg
     
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