From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from The Weldless Steel Tube Co. Ltd. detailing the properties of their cold-drawn weldless tubes in stainless iron and steel.
| Identifier | ExFiles\Box 154a\1\ scan0040 | |
| Date | 2nd November 1925 | |
| COPY. THE WELDLESS STEEL TUBE CO.LTD., WEDNESFIELD, NEAR WOLVERHAMPTON. Ours. STAINLESS. Yours........... 2nd November 1925. Dear Sirs, COLD DRAWN WELDLESS TUBES IN STAINLESS IRON AND STEEL. We have pleasure in announcing that after prolonged experimenting and research we are in a position to supply Cold Drawn Weldless Tubes in sizes from 3/8" up to and including 3" outside diameter with the usual gauges and thicknesses in Stainless Iron and Steel. Tubes made in these materials differ from those made from ordinary Steel as they are:- (a) Insoluble in water and therefore are not affected by weather or ordinary industrial conditions. (b) Insoluble in Alkalies, salt solutions, fruit juices etc. (c) Insoluble in Nitric Acid. As tubes made from Stainless Iron and Steel are not attacked by Ammonia fumes, Ammoniacal liquor, Nitric Acid or Nitrous Compounds they are especially suitable for plant in connection with the manufacture or use of these Compounds such as Chemical Works, Bye-Product Plants, Refrigerating Plants etc. The exceptional behaviour of Stainless Iron and Steel at high temperatures is one of its most valuable features. Up to a temperature of about 800°Cent. the surface does not scale, it is strong at high temperatures and resists erosion. These properties make it an ideal material for the manufacture of tubes which have to convey hot corrosive gases at high speeds. The mechanical properties of Stainless Iron and Mild Stainless Steel can be made to vary over wide limits by suitable forms of heat treatment and tubes made from these materials have the following physical properties when tempered after drawing:- STAINLESS IRON. (LESS THAN .10% CARBON.) Maximum stress. 35/45 tons per square inch. Elongation. 25/35%. Reduction of Area. 55/65%. Yield Point. 25/35 tons per square inch. Izod Impact Figure. 50ft. lbs minimum. | ||