Accession Number : AD0273532

Title :   FLAT HIGH STRENGTH STEEL SHEET APPLICABLE FOR USE IN THE AIRCRAFT AND MISSILE INDUSTRY

Corporate Author : ALLEGHENY LUDLUM STEEL CORP BRACKENRIDGE PA

Personal Author(s) : MCCUNN,T.H. ; SACK,B.

Report Date : 28 FEB 1962

Pagination or Media Count : 1

Abstract : Production of 36 and 48 in wide sheet of air frame structural materials to 1/4 of AISI thickness tolerances was undertaken. Coils of A-286, AM-350, Potomac A, Type 422, and Altemp R-41 were processed to finish thicknesses of 0.010, 0.030, 0.080, and 0.100 in. Coils were gaged at hot roll, intermediate, and finish thicknesses.Although all coils were not within the required thickness range, it was demonstrated that all materials with the possible exception of Altemp R-41 could be produced to 1/4 AISI thickness tolerance on the available equipment. The most important factor affecting crown at finish gage was the percent crown at hot roll thickness. During cold rolling to thicknesses as thin as 0.017 in, the average percent crown was generally unchanged or only slightly affected. End-to-end variation of continuous hot rolled coils was generally superior to that of welded coils. Rolling and cracking of the weld metal could lead to excessive thickness variation. Coils at 0.010 in finish thickness were more difficult to produce and welded coils presented more problems than continuous hot rolled coils. (Author)

Descriptors :   *PRECISION FINISHING, *SHEETS, *STEEL, *THICKNESS, AIRFRAMES, ALLOYS, HEAT TREATMENT, MANUFACTURING, MELTING, MEASURING INSTRUMENTS, PROCESSING, QUALITY CONTROL, ROLLING MILLS, TABLES(DATA), WELDING

Distribution Statement : APPROVED FOR PUBLIC RELEASE