Bethlehem Steel

About: Bethlehem Steel is a based out in . It is known for research contribution in the topics: Coating & Corrosion. The organization has 1529 authors who have published 1559 publications receiving 19098 citations. The organization is also known as: Bethlehem Steel Corporation.

Method of producing light absorptive surface on aluminum zinc alloy coated product

Abstract: This invention is directed to a method for producing a corrosion-resistant, composite product, such as sheet and strip, having a thin, uniformly black, light-absorptive surface layer thereon, and to the product of such method. The method includes the steps of treating a product having a coating containing both zinc and aluminum, such as galvanized strip, or up to 70% by weight, aluminum, balance essentially zinc coated strip, with an aqueous alkaline solution for a sufficient time to form a zinc-rich surface on said product, which surface is reactive with a blackening bath containing Ni and Sb, and subjecting such treated product to such blackening bath to form said thin, uniform, light-absorptive surface layer on said product. The light-absorptive surface layer has a thickness of at least 80 nm, preferably between about 100-400 nm, and an absorptance greater than about 95% over the solar radiation spectrum.

Ferritic alloy with high temperature strength containing dispersed intermetallic TiSi

Abstract: An iron-aluminum ferritic alloy characterized by high-temperature strength, resulting from the precipitation of a fine TiSi intermetallic type precipitate of high thermal stability, and high-temperature oxidation-resistance under conditions of cyclic heating at temperatures up to about 2,500 DEG F. said alloy consists essentially of, by weight, up to about 0.1% carbon, from about 4.0 to about 8.2% aluminum, about 0.2 to 4.0% silicon, about 0.05 to 2.0% titanium, with a preferred silicon/titanium ratio between about 1.0 to 4.0, and the balance iron, incidental impurities and additions which do not materially affect the attainment of the desired properties.

Dynamic K c Testing of Structural Steel

Abstract: Fracture toughness \IK\N\Dc\N values were determined for structural steels in thickness and at loading rates and temperatures representative of service conditions for many civil structures, with particular interest centered on bridges. The measurements were made using notched-bend tests with specimens 3-in. deep, 12-in. long, the full plate thickness, and with notches fatigue precracked to a depth of 1 in. The \IK\N\Dc\N values were computed using the observed maximum load and a crack size plasticity adjustment. A cushioned drop-weight loading technique provided loading times of 0.5 x 10\u-³ sec to 2 x 10\u-³ sec. Strain gages on the loading tup of the free-falling weight permitted load-time recordings for the tests. The limitation on useful \IK\N\Dc\N determinations due to specimen size was approximately 1.25 (in.)¹\u/² in. times the applicable yield strength of the steel. The test results presented are for temperatures ranging from –120° to 60°F and include, for comparison, results obtained with loading times of 1 - 3 sec.

Signal conditioner apparatus for compensating an electronic material gaging signal

Abstract: Signal conditioner apparatus multiplies electronic material gaging signal by one or more predetermined variable scaling factors to compensate for variations in other material properties which affect the gaged property. For example, material thickness gaging signal variations caused by material temperature variations are compensated for by simultaneously feeding the thickness signals through two adjustable-gain amplifiers preset at separate values which establish an adjustable range of temperature compensation. Amplifier outputs are proportioned in response to a material temperature measurement made during material gaging, thereby providing a single temperature compensated material thickness signal at an output. Material composition compensation is provided in combination with temperature compensation by first feeding the thickness signal through a single presettable-gain amplifier. All amplifier gains are preset or controlled from a data source which correlates compensation requirements with temperature and composition effects on material thickness gaging.