. Canadian foundryman (1918). e engines and boilers,brass and copper tubes and sheets, andmiscellaneous smaller components ofmany kinds, have been some of the muni-tion products which have been manufac-tured at these plants. Looking at thequestion from the light of their ex-perience I will endeavor to show in ageneral way the part the metallurgistplays in the different operations whichgo to make up the finished product. Thesame work that is carried on by themetallurgical department in the plantsof these two companies, will be carriedon to a greater or lesser extent in anyof our large munition
. Canadian foundryman (1918). e engines and boilers,brass and copper tubes and sheets, andmiscellaneous smaller components ofmany kinds, have been some of the muni-tion products which have been manufac-tured at these plants. Looking at thequestion from the light of their ex-perience I will endeavor to show in ageneral way the part the metallurgistplays in the different operations whichgo to make up the finished product. Thesame work that is carried on by themetallurgical department in the plantsof these two companies, will be carriedon to a greater or lesser extent in anyof our large munition plants. The general work of the chemist willlie along the following lines: 1. Chemical analysis of raw materialsor finished product. 2. Supervision and regulation over aliheat treatment necessary to pro-duce the finished product. 3. Physical testing of all materials,both in course of manufacture andas a finished product. 4. Microscopic examination of the various materials used. 5. Miscellaneous testing and experi-mental CHEMICAL LABORATORY AT DOM BRIDGE CO Heat Treatment of 75 U. S. ShellsThe specifications laid down for nearlyall shells of a small calibre call for themto be heat treated, after which they mustsatisfy certain physical United States 75 shell aftertreatment has to have an elastic limit of45,000 lbs. per in., an ultimate tensilestrength of 90,000 lbs. per sq. ip., andan elongation of 15 per cent. In heat treating steel to achieve anydesired result it is a great advantage toknow beforehand the chemical composi-tion of the steel. Here is where thechemist comes in. He makes an analysisof the steel and passes it on to the metal-lurgist who uses this information as hisexperience directs. In hardening shellsof any kind the following are the mainfactors influencing the success of theoperation. 1. Uniform heat to the correct temper-ature. 2. Good quenching medium, kept at alow temperature. 3. Uniform tempering to the correcttemperature. Th
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