List: With all of the recent discussion of front frames I found the
following at www.reynoldsusa.com**************************************
Technical Advice for 531
Chemical Composition:C0.23-0.29%S0.045% maxSi0.15-0.35%P0.045%
maxMn1.25-1.45%Mo0.15-0.25%
Typical Physical Properties
Ultimate Tensile Stress:45-55 Tonf/in2
700-850 N/mm2
100-123 KsiElongation on 5.65 A:10% min
Reynolds 531 is entirely suitable for the following manufacturing methods;
under normally recognized working practices:*Hand brazing *Hearth brazing
*Automatic machine brazing
Before the tubes are assembled the ends should be degreased and
cleaned with emery over the area which is inserted into the lug. This
ensures that the brazing material makes good contact with the parent metal.
(Reynolds 531 Cycle Tubes are sent out free from scale and rust, and
protected with an anti-corrosive oil, but if by some mischance during
transport or storage some rust should form, this must be completely
removed.) When the tubes are fitted into the lugs, care should be
taken that the assembly is not in a state of stress. Brazing
should be carried out in the following clockwise sequence:
*bottom bracket *down tube/head tube joint *head tube/top tube joint *top
tube/seat tube joint
This sequence obviates the danger of a stress raiser being created
at a major shock point.
When brazing frames made from Reynolds 531 Tubing, the joints
should be pre-heated, and after brazing the cooling should be controlled and
not forced. Brazing must be carried out in a shop free from draughts.
Great care must be taken not to overheat the material, or to heat
too large an area of the tube. Overheating will lead to burning or to brass
inclusion (where the molten brass or bronze enters the grain of the steel),
either of which will make the tube brittle.
Setting, when necessary, should always be done cold.
Most proprietary brazing materials can be used satisfactorily, but
we recommend the use of brazing materials with a melting point of about 850
C to 950 C.
NB:
A fork EB711 27.5x20 oval x 1.2/0.8 is available as an alternative.
A fork EB712 27.5x20 oval x 1.4/0.9 is available as an alternative.
For lugless construction outside butted seat tubes and oversize
head tubes are available.
Due to raw material availability, items larger than 31.7mm diameter
or thicker than 1.6mm may be supplied in seamless chrome-molybdenum.
The company reserves the right to amend, modify or withdraw and details or
specifications given on this site without prior notice.
Regards, John Walker
69 2+2