Drop Testing Chemical Section. Weight. if either of these latter tests fail, all the rails of the blow which they represent will be rejected, but if both of these additional test pieces meet the requirements, all the rails of the blow which they represent will be accepted. (4) The number of passes and speed of train shall be so regulated that on leaving the rolls at the final pass the temperature of the rail will not exceed that which requires a shrinkage allowance at the hot saws of 6 in. for 85-pound and 6 in. for 100pound rails, and no artificial means of cooling the rails shall be used between the finishing pass and the hot saws. The above shrinkage allowance may be varied, if necessary, so as to give a finishing temperature of not exceeding 1,600 degrees Fahrenheit at finishing rolls for mills rolling from reheated blooms, and not exceeding 1,750 degrees Fahrenheit at finishing rolls for mills rolling direct from the bloom to finish rail. (5) The drop testing machine shall have a tup of two thousand (2,000) pounds weight, the striking face of which shall have a radius of not more than five (5) inches, and the test rail shall be placed head upwards on solid supports three (3) feet apart. The anvil block shall weigh at least twenty thousand (20,000) pounds, and the supports shall be part of, or firmly secured to, the anvil. The report of the drop test shall state the atmospheric temperature at the time the test was made. (6) The manufacturer shall furnish the inspector, daily, with carbon determinations for each blow, and a complete chemical analysis every twenty-four hours, representing the average of the other elements contained in the steel, for each day and night turn. These analyses shall be made on drillings taken from small test ingot. (7) Unless otherwise specified, the section of rail shall be the American Standard, recommended by the American Society of Civil Engineers, and shall conform, as accurately as possible, to the templet furnished by the railroad company, consistent with paragraph No. 8, relative to specified weight. A variation in height of one-sixty-fourth (1-64) of an inch less, or one thirtysecond (1-32) of an inch greater than the specified height, and onesixteenth (1-16) inch in width will be permitted. The section of rail shall conform perfectly to the finishing dimension. (8) The weight of the rails will be maintained as nearly as possible, after complying with paragraph No. 7, to that specified in contract. A variation of one-half (1) of one per cent. for an entire order will be allowed. Rails shall be accepted and paid for according to actual weights. (9) The standard length of rails shall be thirty-three (33) Length. feet. Ten per cent. of the entire order will be accepted in shorter lengths, varying by even feet to twenty-seven (27) feet, and all No. 1 rails less than 33 feet shall be painted green on the end. A variation of one-fourth of an inch in length from that specified will be allowed. (10) Circular holes for splice bars shall be drilled in accord- Drilling. ance with the specifications of the purchaser. The holes shall accurately conform to the drawing and dimensions furnished in every respect, and must be free from burrs. (II) Rails shall be straight when finished, the straightening Finish. being done while cold, smooth on head, sawed square at ends, variation to be not over one-thirty-second (1-32) of an inch, and prior to shipment shall have the burr occasioned by the saw cutting removed and the ends made clean. No. I rails shall be free from injurious defects and flaws of all kinds. (12) The name of the maker, the weight of rail and the Branding. month and year of manufacture shall be rolled in raised letters on the side of the web, and the number of blow shall be plainly stamped on each rail where it will not subsequently be covered by the splice bars. (13) The inspector representing the purchaser shall have Inspection. free entry to the works of the manufacturer at all times when the contract is being filled, and shall have all reasonable facilities. afforded him by the manufacturer to satisfy him that the finished material is furnished in accordance with the terms of these specifications. All tests and inspection shall be made at the place of manufacture prior to shipment. (14) No. 2 rails will be accepted up to five (5) per cent. of No. 2 Rails. the whole order. Rails that possess any injurious defects, or which for any other cause are not suitable for first quality, or No. 1 rails, shall be considered as No. 2 rails; provided, however, that rails which contain any physical defects which impair their strength shall be rejected. The ends of all No. 2 rails shall be painted white in order to distinguish them. Rails rejected under the drop test will not be accepted as No. 2 rails. SUMMARY OF ACTION ON REPORT OF COMMITTEE COMPILED BY THE SECRETARY. The recommendations embodied in the report of Committee A, on Standard Specifications for Iron and Steel, were formally adopted with the following modifications and amendments: I. Standard Specifications for Structural Steel for Bridges. Par. 2. In last column of table, after 90 degrees, insert "on diameter equal to three times the thickness (d=3t)”. Par. 3. Strike out the words, "Tensile tests of steel showing an ultimate strength within 5,000 lbs. of that desired will be considered satisfactory except that." Insert the words "at the discretion of the inspector." The paragraph, as amended, reads as follows: "If the ultimate strength varies more than 4,000 lbs. from that desired, a retest may be made, at the discretion of the inspector, on the same gage, which, to be acceptable, shall be within 5,000 lbs. of the desired ultimate." Par. 11. In clauses (a) and (b) strike out the words "of elongation." Strike out clause (c) on account of its inconsistency with Par. 7, defining the size of specimen for tensile tests on pins and rollers. II. Standard Specifications for Open-hearth Boiler Plate and Rivet Steel. The modifications recommended by the Committee of the American Society of Mechanical Engineers were not accepted, and the present standard specifications were reaffirmed without change. III. Standard Specifications for Steel Rails. Par. 3. The proposed change of "from each blow" to "from every fifth blow" was referred back to Committee A for further information. Insert the words "taken from the top of the ingot," after the words "If any rail break when subject to the drop test, two additional tests." act. Par. 4, 7, and 8. Referred to Committee A with power to IV. Standard Specifications for Steel Castings. The changes proposed by the Committee of the American Society of Mechanical Engineers were not accepted. The present standard specifications were reaffirmed, except that Par. 1 be modified as recommended by Committee A. V. Standard Specifications for Steel Axles. VI. Standard Specifications for Steel Forgings. The changes proposed by the Committee of the American Society of Mechanical Engineers were not accepted. The modifications for locomotive axles and forgings, recommended by Committee A, were adopted except that the proposed bending test was stricken out. The proposed revised Standard Specifications for (1) Structural Steel for Bridges, (2) Steel Castings, (3) Steel Axles, and (4) Steel Forgings, recommended by Committee A, and modified as above, were referred to letter ballot of the Society. The returns from this ballot, canvassed on September 1, 1905, resulted affirmmatively, as announced in detail in Circular No. 23. The revised standard specifications are reprinted in the following pages. Manufacture. STANDARD SPECIFICATIONS FOR STRUCTURAL STEEL FOR BRIDGES.* 1. Steel shall be made by the open-hearth process. 2. The chemical and physical properties shall conform to the following limits: Retests. Chemical Plates, Shapes and Bars. The yield point, as indicated by the drop of beam, shall be recorded in the test reports. 3. If the ultimate strength varies more than 4,000 lbs. from that desired, a retest may be made, at the discretion of the inspector, on the same gauge, which, to be acceptable, shall be within 5,000 lbs. of the desired ultimate. 4. Chemical determinations of the percentages of carbon, phosphorus, sulphur and manganese shall be made by the manufacturer from a test ingot taken at the time of the pouring of each melt of steel and a correct copy of such analysis shall be furnished to the engineer or his inspector. Check analyses shall be made from finished material, if called for by the purchaser, in which case an excess of 25 per cent. above the required limits will be allowed. 5. Specimens for tensile and bending tests for plates, shapes *Adopted by letter-ballot of the Society on September 1, 1905. |