FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1917
1917 - 1283.PDF
H^ECEMBER 6, 1917. " ,'-• .' • ••'''""' '-' (c) The billets from which the bars are made are to be •rough turned or chipped to remove all surface defects which might produce seams in the finished bar. No undercutting in chipping will be allowed. Heat Treatment.—(d) The steel manufacturer shall state the heat treatment recommended to give the physical proper- ties specified. («) If the bars are furnished in the heat-treated condition, and the physical tests show that the heat treatment has not been correct, the bars may be retreated at the option of the •purchaser. WORKMANSHIP AND FINISH.—4. (a) The bars are to be sound, commercially straight, free from pipes, laps, cracks, twists, seams, and damaged ends, and are to have a work- manlike finish. They are to be uniform in quality, within the stipulated margins of manufacture, capable of being turned and threaded readily and of taking a good finish. (b) Any article may be rejected because of injurious defects or faults in manufacture at ahy time, notwithstanding that it has previously passed the physical and chemical tests ; it shall be returned to the manufacturer at the latter's ex- pense. This clause shall not be taken to apply to materials fabricated after export. PHYSICAL PROPERTIES AND TESTS.—5. (a) The bars shall have the following physical properties : Tensile Test.—(6) Minimum tensile strength, 175,000 lb. per sq. in. (123.0% kg./mm.2) ; minimum yield point, 150,000 lb. per sq. in. (105.45 kg./mm.2) ; minimum elongation in 2 in. (50.8 mm.) (or proportional gauge length), 12 per cent. ; minimum reduction of area, 40 per cent. Impact Test.—(c) When impact-testing machines of the pendulum type are available, tests shall be carried out if required to determine the specific impact work of rupture in foot-pounds (or kilogram metres). "Results markedly lower than the average for this type of material will be sufficient oause for further investigation (or reheat treatment) of the material. Selection of T esP Specimens.—(d) Three bars of each size rolled from a heat shall be taken and test pieces prepared in accordance with the I.A.S.B. standards. Each test piece and the bar from which it is cut shall be stamped with an identifying number. Should any of the test pieces, after being heat treated in the manner recommended by the steel manu- facturer, fail to show the prescribed physical properties, new test pieces similarly identified shall be made from the same three bars. At the option of the purchaser the steel manufacturer may recommend a different heat treatment for the second set of test specimens, and to that end he may make such tests as he desires from the remainder of the three bars taken for the tests. Should any of the three speci- mens taken for the final tests fail to show the required physical properties, the bars of that heat of the size represented by the specimens shall be rejected. DIMENSIONS AND TOLERANCES.—6. The dimensions and tolerances shall be those given in the Specification 3S11. DELIVERY, PACKING AND SHIPPING.—7. (a) The bars may be delivered in the annealed or in the heat-treated condition. (b) The bars shall in general be grouped in bundles weighing not more than 250 lb. (113.4 kg.), unless otherwise agreed between manufacturer and purchaser; the heat number and the I.A.S.B. steel serial number shall be plainly marked on a metal tag attached to each bundle. If bars are not so grouped and bundled, each bar shall be plainly marked with the heat number and the I.A.S.B. steel serial number. Chemical compositions of standard alloy steels. » NICKEL STEELS. Phos- Sul- phorus, phur, Carbon. Manganese, maxi- maxi- mum, mum. 0.25-0.35 0.50-O.80 0.040 0.045 0.30-0.40 0.50-0.80 0.040 0.045 Number. 2330 .. ^335 •• 3135 ••3230 .. 3240 . . X3330X3340 333° • •334»- • X3440 6130 6140 . NICKEL-CHROMIUM STEELS. 0.30-0.40 0.50-0.80 0.040 0.045 1.00-10.25-0.35 0.35-0.450.25-0.35 0-35-O-45O-35-O-35 Nickel. Chromium. 3-25-3-75 3-25-3-75 0-35-0-45 O-35-O-45 50 o.30—0.60 o .30—0.60°-45-o-75 Q-45--O75 o .30—0 .60 0.30-0.60 0.30-0.60 o .040 o .040 o .040 o .040 o .040 o .040 0.040 o .045 0.045 o .045 o .045 o .045 0.045 0.045 50 1.50-2.00 I.50-2.00 2-75-3-25 2.75-3-25 3-25-3-753-25-3-75 4.00-5 .00 0.45-0.75 0.90-1.25 0.90-1.25 0.70-0.95 o .70-0.go 1-25-1-75 1.00—1.50 CHROMIUM-VANADIUM STEELS. Vanadium, Chromium. minimum. o-25-o.35 0.50-0.80 0.040 0.045 0.80-1.10 0.15 ' O-35-O-45 0.50-0.80 0.040 0.045 0.80-1.10 0.15 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 0.03 per cent. (To be continued.) Lord Northcliffe and Air Raid Burdens. IN an interview with a representative of the Thanet Advertiser Lord Northcliffe expresses surprise that some of his neighbours have moved to London and other places. He added, " The losses of life owing to the German air and marine raids have been practically nil. When I was in America, to which I am returning, 995 people died of heat in New York City in one week alone. I did not hear of any in- habitants flying from New York, although there are plenty >of cool places within reach. The vague communiques referring to ' South-East England ' make many people in London and elsewhere think that Thanet is the main centre of German at- tacks. Even if it were the centre it would not amount to very much. The real effect of these raids is to rouse Americans. "As to the question of compensation for trade losses due to the German mosquitoes, Thanet bears a grossly unfair share of its burden of war, and should be handsomely recom- pensed by the rest of the United Kingdom. If I were not about to return to the United States.I would take the matter up with the authorities." 00H00000 0 0 0 0 In the Hands of the Enemy. — A French Voisin biplane captured by the Germans. Under the nacelle can be seen a bomb- rack and a search-light. 0 0 0 0 0 0 0 0 0 0 m 0 0 00000000 1283
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
