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Aviation History
1940
1940 - 1976.PDF
26 Advertisements. JULY II, 1940 This Aluminium c a hammering 1HE bracket casting and wheel fork top shown above were hammered to the point where cracks first appeared. They bent but did not break. The amount of deform- ation achieved without fracture would have been impossible with a casting in any alloy but NA.350, except possibly NA.226 to DTD.298. NA.350, containing 10% magnesium, adds to its high impact resistance, shear strength, elongation and a remarkable resistance to cor- rosion. Cast-to-shape test bars submitted to the Admiralty for corrosion tests were immersed in tidal water for six months. At the end of that time, only slight brown fleck- ing was oBserved on the surface, and ten- sile tests failed to reveal any deterioration whatever in the soundness of the material. The mechanical properties of NA.350 make it suitable to replace malleable cast iron and mild steel, with great improve- ment in strength/weight ratio. For aircraft, particularly for seaplanes, flying boats, and planes operating over water, it is considered the most generally useful of all aluminium casting alloys. NA.350 to DTD.300, SHOWING PROPERTIES OBTAINED IN REGULAR PRODUCTION 0.1% Proof - '-••" .- Ultimate Tensile Strength Elongation % on 2 inches DTD.300 TYPICALVALUES 11 16 7 13 20 11;'12 •k Please consult our Research and Develop- ment Department for data on NA.350 or other "Noral" aluminium products used in aircraft construction.NORTHERN ALUMINIUM CO. LTD HEAD OFFICE: BANBURY, OXFORDSHIRE. TELEPHONE: BANBURY 2244 A.C12a.
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