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Dictionary – D
- DEAD FLAT
- DEAD SOFT ANNEALING
- DEAD SOFT STEEL
- DEAD SOFT TEMPER
- DEBURRING
- DECARBURIZATION
- DEEP DRAWING
- DEGASSING PROCESS
- DELTA IRON
- DEOXIDIZING
- DIE-LINES
- DIE SINKING
- DISH
- DOCTOR BLADE STEEL STRIP
- DRAWING BACK
- DRILL ROD
- DRY ROLLED FINISH
- DUCTILITY
- DURALUMIN
DEAD FLAT
Perfectly flat. As pertaining to sheet, strip or plate. (See Stretcher Leveling)
DEAD SOFT ANNEALING
Heating metal to above the critical range and appropriately cooling to develop the greatest possible commercial softness or ductility.
DEAD SOFT STEEL
Steel, normally made in the basic open-hearth furnace or by the basic oxygen process with carbon less than 0.10% and manganese in the 0.20-0.50% range, completely annealed.
DEAD SOFT TEMPER
(No. 5 TEMPER) – Condition of maximum softness commercially attainable in wire, strip, or sheet metal in the annealed state.
DEBURRING
A method whereby the raw slit edge of metal is removed by rolling or filing.
DECARBURIZATION
Removal of carbon from the outer surface of iron or steel, usually by heating in an oxidizing or reducing atmosphere. Water vapor, oxygen and carbon dioxide are strong decarburizers. Reheating with adhering scale is also strongly decarburizing in action.
DEEP DRAWING
The process of cold working or drawing sheet or strip metal blanks by means of dies on a press into shames which are usually more or less cup-like in character involving considerable plastic deformation of the metal. Deep-drawing quality sheet or strip steel, ordered or sold on the basis of suitability for deep-drawing.
DEGASSING PROCESS
(In steel making) – Removing gases from the molten metal by means of a vacuum process in combination with mechanical action.
DELTA IRON
Allotropic modification of iron, stable above 2552°F. to melting point. It is of body-centered cubic crystal structure.
DEOXIDIZING
Removal of oxygen. In steel sheet, strip, and wire technology, the term refers to heat treatment in a reducing atmosphere, to lessen the amount of scale. (See Controlled Atmosphere Furnaces)
DIE-LINES
Lines of markings caused on drawn or extruded products by minor imperfections in the surface of the die.
DIE SINKING
Forming or machining a depressed pattern in a die.
DISH
A concave surface departing from a straight line edge to edge. Indicates transverse or across the width.
DOCTOR BLADE STEEL STRIP
A hardened and tempered spring steel strip, usually blued, produced from approximately .85 carbon cold rolled spring steel strip specially selected for straightness and good edges. Sometimes hand straightened or straightened by grinding and cut to desired lengths. This product is used in the printing trade as a blade to uniformly remove excess ink (“dope”) from the rolls; hence its name.
DRAWING BACK
Reheated after hardening to a temperature below the critical for the purpose of changing the hardness of the steel. (See Tempering)
DRILL ROD
A term given to an annealed and polished high carbon tool steel rod usually round and centerless ground. The sizes range in round stock from .013 to 1 ½” diameter. Commercial qualities embrace water and oil hardening grades. A less popular but nevertheless standard grade is a non-deforming quality. Drill Rodsare used principally by machinists and tool and die makers for punches, drills, taps, dowel pins, screw machine parts, small tools, etc.
DRY ROLLED FINISH
Finish obtained by cold rolling on polished rolls without the use of any coolant or metal lubricant, material previously plain pickled, giving a burnished appearance.
DUCTILITY
The property of metals that enables them to be mechanically deformed when cold, without fracture. In steel, ductility is usually measured by elongation and reduction of area as determined in a tensile test.
DURALUMIN
The trade name applied to the first aluminum-copper-magnesium type of age-hardenable alloy (17S), which contains nominally 4% Cu, ½ % Mg. The term is sometimes used to include the class of wrought aluminum-copper-magnesium alloys that harden during aging at room temperature.