. Official proceedings . steel, and many times as resist,ant as certain plain irons and steels in wide use. The shape of the curve in the figure shows that the life ofa structure cannot be determined from a single set of corrosionobservations. The steel in the structure or samples of the steelmust be observed from time to time in order to arrive at theshape of the curve representing the speed of deterioration. Thedesigning engineer may then calculate the expected period ofusefulness of the structure. USS COR-TEN is characterized by a slow, rapidly decreas-ing rate of corrosion in the atmospher
. Official proceedings . steel, and many times as resist,ant as certain plain irons and steels in wide use. The shape of the curve in the figure shows that the life ofa structure cannot be determined from a single set of corrosionobservations. The steel in the structure or samples of the steelmust be observed from time to time in order to arrive at theshape of the curve representing the speed of deterioration. Thedesigning engineer may then calculate the expected period ofusefulness of the structure. USS COR-TEN is characterized by a slow, rapidly decreas-ing rate of corrosion in the atmosphere. A smooth, evenly cor-roded surface results, the advantage of which is obvious. The 27 coating that forms is harder, denser, and more adherent thanthat which forms on ordinary steel, and severe abrasive acti(jnis necessary to remove it. The ])liotog-ra])h in Figure 4 showsthe extent and character of the oxide which forms on USSCOR-TEN, co])per steel, and plain steel after three years in asevere industrial atmos]) FIGURE 4.—Typical samples of uncleaned USS COR-TEN, copper steel, and plainsteel after exposure to an industrial atmosphere for three years. The oxide onCOR-TEN is dense, hard, and unusually adherent. The notches in the edges are identifying marks. The durability of USS COR-TEX under the combined at-mospheric and brine spray conditions which may exist in andaround refrigerator cars, icing stations and right-of-way equip-ment, emphasizes the resistance of this material to severe cor-rosive influences- Sam])les of many steels were compared bvexposing sheets to an industrial atmosphere at an angle of fivedegrees from horizontal and spraying them twice weeklv with a10% salt solution. The samples were sprayed on both sides onlylong enough to thoroughly wet them, the test being continuedfor a period of three months. USS COR-TEX, under these con-ditions, is twice as durable as copper steel and almost threetimes as good as open hearth iron and steel. The rust on allo
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