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Aviation History
1918
1918 - 0134.PDF
[K|CHT| JANUARY 31, 1918. INTERNATIONAL AIRCRAFT STANDARDS. (Continued from page 104.) 3S28—Specifications for Alloy Steel Sheet. GENERAL.—1. The general specifications, IGI, shall form according to their applicability, a part of these specifications. MATERIAL.—2. The material for these sheets shall be chosen from the I.A.S.B. standard alloy steels listed below : CHEMICAL COMPOSITION OF STANDARD ALLOY STEELS. NICKEL STEELS. ' , . ...-..; I 2315 23*0 23*5 3140 3215 X33I5 3315 I A61 so 30.10-0.20 0.15-0.25 0.20-0.30 0.30-0.60 0.50-0.80 g 3-25-3-75 3-25-3-75 3-25-3-75 NICKEL-CHROMIUM STEBLS. 0.15-0.25 0.30-0.60 0.040. 0.045 1.00-1.50 0.45-0.75 0.10-0.20 0.30-0.50 0.040 0.045 1.50-2.00 0.90-1.25 0.10-0.20 0.30-0.60 0.040 0.045 2.75-3.25 0.70-1.95 0.10-0.20 0.30-O.60 0.040 0.045 3-25-3-75 I-25-I-75 CHROMIUM-VANADIUM STEELS. 0.15-0.25 0.30-0.60 6 ..0.60-0.90 > ••)0.15- The composition shall be stated by the manufacturer or con- tractor and is further limited as follows : Carbon, sot over 0.25 per cent. ' '•• -: MANUFACTURE.—3. (a) The steel shall be manufactured, or at least finished, by the open-hearth, electric-furnace, or crucible process. (b) A sufficient discard shall be made from each ingot to secure freedom from piping and undue segregation. (c) Sheets, unless ordered cold-rolled; shall be full pickled. (d) Sheets are to be well and uniformly annealed in accord- ance with good commercial practice. For sheets lighter than 0.065 in- (l65 mm.), box annealing is preferred. For sheets 0.065 in- (1-65 mm.) and thicker, open annealing is preferred. Heat Treatment.—(e) The manufacturer shall state the heat treatment recommended to give the physical properties specified. WORKMANSHIP AND FINISH.—4. (a) The sheets must be commercially flat, clean,smooth, free from seams, laminations, blisters, and other surface defects. They must be uniform in quality, and within the stipulated margins of manufacture. (6) Any sheet may be rejected because of injurious defects or faults in manufacture at any time, notwithstanding that it has previously been accepted by the inspector ; it shall be returned to the manufacturer at the latter's expense. This clause shall not be taken to apply to materials fabricated after export. To Help the Italian Loan. MATERIAL assistance in putting forward the attractions of the new Italian War Loan was afforded by a shower of leaflets dropped from a fleet of three dirigibles, five Caproni and two Farman aeroplanes, with the Under-Secretary of the Treasury, Signor Visocchi, and the Under-Secretary of Aviation, Signor Chiesa, on board, which flew over Rome OH Monday. Hun Attacks on Italian Hospitals. " " HELPED by an almost full moon and by a low-lying mist, which hampered the anti-aircraft gunners, enemy airmen during the night of January 26th raided towns in the Venetian plain.and came back again and again at intervals until dawn." says Mr. G. Ward Price, writing to the Times from the Italian headquarters. " Mestre,which stands on the shore of the lagoon surrounding Venice, was their chief victim. Here they killed and wounded seven women and children. They also killed some ambulance men who had come into the town to pick up the victims of the raid, and then did considerable damage to three hospitals, cracking their walls from top to bottom." "Canada in Khaki." THE first volume of " Canada in Khaki" was excellent value, but the second volume, which is just issued, is super- excellent value at 3s., and the sale should very materially help the Canadian War Memorial Fund which exists to provide PHYSICAL PROPERTIES AND TESTS.—5. (a)'Specimens- cut in any direction from the heat-treated sheets_shall have the following properties :— , Tensile Test.—(b) Minimum tensile strength, 100,000 lbs. per sq in (70 30 kg. per mm.2) ; minimum yield point, 75,000 lbs. per sq. in. (52,73 kg. per mm.') ; minimum elongation, 15 per cent, in 4 ins. (101.6 mm.). Bend Test. (c) Strips cut from annealed sheets shall stand being bent cold through an angle of 180 deg., in any direction, to a radius equal to the thickness of the sheet without fracture. Id) Strips ij ins. (31.75 mm.) wide cut from annealed sheets and with edges rounded, shall stand reversed bending, cold, through an angle of 90 deg. for not less than three complete reversals, without fracture. The test is to be made in a square-nose vice, the edges over which the specimen is bent being rounded to a radius equal to three times the thickness of the sheet. SELECTION OF TEST SPECIMENS.—6. Three sheets shall be taken from each annealing box to represent the top, middle, and bottom of the stack, or one sheet from each 25 when sheets are open annealed. One tensile, one bending, and one reverse bending test, shall be made from each sheet selected. DIMENSIONS AND TOLERANCES.—7. The dimensions and tolerances shall be those given in the table below and in the specifications 3S11. The thickness will be specified in decimate of an inch or millimetres : TABLE OF TOLERANCES FOR STANDARD STEE SHEETS.„ ; Tolerance for sheetsThickness. " 14 ins. (35.6 cm.) wide and under. Inches. Millimetres. Inches. Millimetres. OM>.O2O 0.51 0.021-0.030 0.54-0.76 Tolerance for sheets over 14 ins. (35.6 cm.)] wide. 0.031-0.040 0.041-0.050 0.051-0.065 0.066-0.080 o .801 -o .100 o.101—0.120 O.I2IH5.25O -ro .001 — 0.002 +0.002 —0.003 ±0.003 ±0.003 ±0.004 ±0.004 ±0.006 ±0.006 ±0.006 +0.03 +0.05 +0.05 -0.08 ±0.08 ±0.08 ±0.10 ±0.10 ±0.15 ±0.15 ±0.15 Inches.±0.002 Millimetre.±0.05 ±0.003 ±0.08 ±0.003 ±0.004 ±0.004 ±0.005 ±0.006 ±0.007 ±0.008 ±0.08 ± 0.10 ±0.10 ± 0.13 ±0.15; ±0.18 ±0.20 0.79-1.02 1.05-1.27 1.30-1.65 1.68-2.03 2.06-2.54 2-57-3-oj 3.08-6.35 DELIVERY, PACKING, AND SHIPPING.—8. (a) Sheets shall be cut to the required dimensions and shall be ordered in as narrow widths as can be used. (b) All sheets shall be oiled for protection against corrosion. (c) Sheets 0.065 in- (!-65 mm.) or thinner shall be boxed, the weight of the box with contents not to exceed 220 lbs. (100 kg.). d) Sheets thicker than 0.065 in- (*-65 mm.), up to and including 0.125 in. (3.18 mm.), shall be crated, the weight of crate and contents not to exceed 220 lbs. (100 kg.). (e) Sheets thicker than 0.125 "*. (3-J8 mm.) may be bundled, the weight of bundle not to exceed 220 lbs. (100 kg.). When electric or crucible furnace steel is specified in the order, the maximum allowable percentages of phosphorus and sulphur may, at the option of the purchaser, be limited to 9-O3 per cent. . . , • i (To be continued.) . : the Dominion with a pictorial record worthy of the heroic deeds of her sons. Included in the 200 pages are stories, articles or verse by Mr. Max Pemberton, Major C. G. D. Roberts, Mr. Edwin Pugh, Mr. Pett Ridge, Miss Jessie Pope, Mr. Philip Gibbs, Mr. Percival Phillips, Mr. Perry Robinson, Mr. Beach Thomas, and Mr. St. John Adcock, while the illustrations (including ten coloured plates) are the work of such artists as Mr. Byam Shaw, Major Richard Jack, Prof. - G. Moica, Mr. Dudley Hardy.-Mr. Heath Jtobirison; and Major Bairnsfather. Pan-American Aero Show Abandoned. ANNOUNCEMENT has been made by the Organisation Committee of the Second Pan-American Aeronautical Exposi- tion which was to have been held in the Grand Central Palace, New York, opening on Feb. 16th, that the exhibition is to be postponed in order to keep clear of any possibility of con- gesting transport. A series of aeronautical conferences are to be held instead of a show. Another Record by Miss Stinson. A FEW details are now to hand of a new American non- stop record made by Miss Katherine Stinsou, on a triplane, on Dec. nth. She flew from San Diego to San Francisco— 610 miles in 9 hrs. 10 mins.; crossing the Tehachapi moun- tains in Southern California at 9,000 feet. This trip beats. Miss Ruth Law's record of 512 miles between Chicago and" Hornell, N.Y., made on Nov. 19th, 1916. I3O
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