METAL PROPERTIES, CHAR, USES, AND CODES - OD1643 - LESSON 1/TASK 1
(6) Alloy Steels. Alloy steels are frequently recognized by their
use.
There are many varieties of alloy steels used in the
manufacture of Army equipment.
Each is best identified by
experience.
They have greater strength and durability then other
carbon steels, and a given strength is secured with less material
weight.
Their economical use depends upon proper heat treatment to
avoid weakening in the region of a weld. Nickel, chromium, vanadium,
tungsten, molybdenum, and silicon are the most common elements used
in alloy steels. A list of these types of steel is provided below:
(a) Chromium alloy.
(b) Nickel alloy.
(c) High chromium-nickel alloy (stainless steel).
(d) Manganese alloy.
(e) Molybdenum alloy.
(f) Titanium and columbium (niobium) alloy.
(g) Tungsten alloy.
(h) Vanadium alloy.
(i) Silicon alloy.
(j) High speed tool steel.
(k) High yield strength, low alloy structural steel.
d.
Nonferrous Metals.
(1) Aluminum. The chemical symbol for this element is AL, and the
principal ore of aluminum is bauxite which is produced by the
weathering of aluminum silicate rocks.
Aluminum is a lightweight,
soft, low strength metal which can easily be cast, forged, machined,
formed, and welded.
It is suitable only in low temperature
applications, except when alloyed with specific elements.
(a) Uses. Aluminum is used as a deoxidizer and alloying agent in the
manufacture of steel. Castings, pistons, torque converter pump housings,
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