sawston_vulcan":3uscgp3e said:You cannot tig weld 531.....thats why Reynolds stop making it....525 can be tig welded and was the UK replacement for 531.....520 is used in the far east [Taiwan et al]......When was the frame made...525 was introduced in 1998.....and it is a good quality double butted Chromoly steel....531 has Vanadium in it.
willsdad":2krn48ic said:I think this was a limited run reynolds made exclusively for paul donoghue.
It probably is slightly different metallurgically to 531c or ST. It also had a millenium designation. I think there was an 853 Millenium too with the oversized shaped tubes.