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| GLOSSARY BASE BOX—A unit of area equivalent to 31,360 sq. in. (217.78 sq. ft.) BASE WEIGHT- A designation number indicating a nominal thickness BLACK PLATE—A low carbon cold reduced steel intended for use in the uncoated state or for coating with tin for tinplate products. BOX ANNEALING (BA)—This process involves slow heating and cooling of coils from a subcritical temperature, to soften and relieve stresses produced during cold reduction. It is accomplished in an air tight box and a relatively bright surface is maintained introducing an inert or slightly reducing gas during the cycle. BRIGHT FINISH—A melted electrolytic tin coating which has a lustrous appearance. BUNDLE—A unit containing two or more packages. A unit is considered standard if consisting of 10, 12, or 15 packages (package considered standard if consisting of 112 sheets per package.) COATING WEIGHT—A term referring to the desired amount of tin per base box of plate.
DIFFERENTIALLY COATED TINPLATE—Electrolytic tinplate with a different weight of in coating on each side. Normally line marked on the heavy coated side. DOUBLE REDUCED (2CR)—A product which is given a partial cold reduction then annealed and given another cold reduction to the final thickness. The resulting product is stiffer, harder and stronger than a single reduced product and offers economies, in many instances, to users by enabling them to use lighter base weights. DRAWN AND IRONED (D&I)—Process for making two-piece cans in which a circular blank is drawn through a die to form a cup and then thinned to final dimensions by being forced through a series of two or three progressively smaller diameter “ironing” rings. DRAW-REDRAW (DRD)—Process for making two-piece cans in which a circular blank is drawn through a die to form a shallow cup and then redrawn through a second or third die to produce a can of desired dimensions. ELECTROLYTIC CHROMIUM COATED STEEL (ECCS)—A low carbon steel, single or double reduced black plate having a thin coating of chromium/chromium oxide applied electrolytically. ELECTROLYTIC TIN-COATED SHEET (ETCS)—Cold rolled sheets 0.0150 in. and thicker, which have been processed through an electrolytic tinning operation and on which tin coatings of various weights are deposited. ELECTROLYTIC TINPLATE—Cold rolled low carbon steel of 0.0149 in. thickness or lighter on which tin has been electro-deposited. K-PLATE—Electrolytic tinplate, NO. 50 or heavier tin coating, with improved corrosion performance for some galvanic detinning food products. MATTE FINISH—An unmelted tin coating which has a dull appearance.
MELTED FINISH—A bright or fused finish. PACKAGE—A unit of 112 sheets. PICKLING—A process of removing iron oxide from hot rolled bands by immersion in an acid solution prior to cold reduction. ROLLING WIDTH—The dimension of the sheet perpendicular to the rolling direction of the steel strip. STEEL TYPE D—An aluminum killed base metal steel sometimes required to minimize severe fluting and stretcher strains or for severe drawing applications, or where special directional properties are required. STEEL TYPE L—Base metal steel, low in metalloids and residual element. Sometimes used for improved internal corrosion resistance for certain food product containers. STEEL TYPE MR—Base metal steel similar in metalloid content to Type L, but less restrictive in residual elements, commonly used for most tinplate applications. TEMPER—An arbitrary number designation to indicate the forming properties of tin mill products. TIN COATING WEIGHT—The amount of tin per base box of plate, e.g., No. 25 equivalent to 0.25 pound per base box. UNIT—A carton of a specified number of packages, or a specified maximum unit weight. Contact Us Guide to Bethlehem's Tin Mill Products Sparrows Point Home Home E-mail comments to: [email protected]
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CONTINUOUS
ANNEALING (CA)—This process consists of passing the cold reduced strip
continuously and in a single thickness through a series of vertical passes within a
furnace consisting of heating, soaking, and cooling zones. An inert or slightly reducing
gas is maintained in the furnace to obtain a relative bright strip. 
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