An airfield workshop would unlikely have suitable case hardening nor heat treatment ovens, and on so on, nor stocks of the right metal in that grade.
12.
By 1936 Advance had become contractors to the War Office, Admiralty and the Air Ministry, providing specialist engineering services including cylinder re-grinding and repairs, case hardening and grinding.
13.
Ferroboron ( 15 % boron ) is used to introduce boron into steel; nickel-boron alloys are ingredients in welding alloys and case hardening compositions for the engineering industry.
14.
At this temperature steels and other ferrous alloys are still in a ferritic phase, which is advantageous compared to other case hardening processes that occur in the austenitic phase.
15.
"' Ferritic nitrocarburizing "'or, more commonly known as "'tennifer "', in British English, is a range of case hardening processes that diffuse nitrogen and carbon into ferrous metals at sub-critical temperatures.
16.
Certain pre-industrial case hardening processes include not only carbon-rich materials such as charcoal, but nitrogen-rich materials such as urea, which implies that traditional surface hardening techniques were a form of carbonitriding.
17.
The metal saws and files, in addition to the special case hardening, are also subjected to a hard chromium plating process so that iron and steel can also be filed and cut.
18.
Explanations of their formation include salt weathering, differential permeability, wetting-drying, and freezing-thawing cycles, variability in lithology, case hardening and core softening, and / or micro-climate changes and variation ( that is, moisture availability ).
19.
At around the same time engineers at Midvale Steel and The Ohio Crankshaft Company in America were attempting to use the surface-heating effect of the MF current to produce localized surface case hardening in crankshafts.
20.
By heating thin iron rods in a carbon-rich forge, carbon could be added to the surface, making a thin layer of steel on the surface through a process called carburization ( see also case hardening ).
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