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Aviation History
1940
1940 - 0816.PDF
- 88 Advertisements. MARCH 14, 1940 • • * TECHNICAL INFORMATION ON THE USE OF ••* ALCLAD NA.21S (formerlyNA.26s) to Speci- fication DTD.351 is an aluminium alloy sheet of the double heat-treated type having a higher proof stress, namely 19 tons per square inch, than any other Alclad Alloy in large scale production. In the solution heat-treated condition in which it is normally supplied, Alclad NA.21S alloy may be readily formed without prior heat-treatment or annealing. The final low temperature precipitation treat- ment which is necessary to obtain full mechanical properties does not cause buckling or distortion. By eliminating solution heat-treatment in the constructor's works immediately before forming, which is the normal prac- tice with alloys which age harden at room temperature, a considerable speeding up of production is possible. Below is given a table of recommended minimum radii for bends carried out on Alclad NA.21SW Alloy Sheet when formed in the solution heat-treated condition. • • • Our Advisory Service Department will provide further technical data demanded by special circumstances. Please write. RECOMMENDED Approximate sheet thickness in inches Angle of Bend Bend Radius .016" 90° 0-1T 180° 0-1T MINIM-UM RADII FOR BENDS .032" 90° O-1T 180° i-UT .084" 90° i-HT 180° i-UT T=Thickness of Sheet .125" 90° 4-1 iT 180° 1-21 .187" 90° 1-2T 180° 1i-3T .250" 90° 1J-3T 180 2-4T — NORTHERN ALUMINIUM &. flt<L BANBURY, OXFORDSHIRE. Telephone: BANBURY 2244 BIRMINGHAM: MIDDLEMORE ROAD, HANDSWORTH, 21. Tekpbme: BIRMINGHAM NORTHERN ?6
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