Corrosion-resistant Steel Sheet Research Articles

ИССЛЕДОВАНИЕ СВОЙСТВ СТАЛЬНОЙ ЭМАЛИРОВАННОЙ ПОВЕРХНОСТИ ДЛЯ СИЛОСНЫХ БАШЕН

One of the technologies for obtaining and storing high-quality silage and haylage is the use of silo towers. The authors propose to manufacture silo towers from high-strength and corrosion-resistant steel sheets, coated with glass enamel, which has a lower coefficient of sliding friction than steel and concrete, as well as high resistance to aggressive environments. The aim of the study was to determine the properties of the glass-enamel coating of steel parts for the manufacturing of tower-type storages. A glass-enamel coating from a frit of glass-enamel brand MK-5 was applied to prepared sheets of steel 09G2S using a spray gun. The total thickness of the enameled coating ranged from 200 to 350 nm. Steel sheets were baked at a temperature of 850°C for 30 minutes. The thickness of the enamel coating was determined with an Olympus GX51 microscope. The roughness was determined using a TAYLOR HOBSON Surtronic 25 profilometer. The adhesive properties of the coating were studied using a Positest AT-M adhesive meter. Each test piece was tested twice. The tests were carried out on a sheet of 0.06 m2. The coefficient of sliding friction was determined on an adapted test bench. Laboratory tests with silage mass were carried out according to the developed methodology. Studies of the steel surface with a glass-enamel coating showed that the average thickness of the enameled layer was 690 nm, the roughness was 0.01 μm, and the adhesion was 5.25 MPa. The sliding friction coefficient of sliced plant materials on the enameled steel surface was 0.15, which is 2.6 and 3.2 times lower than that of non-enamelled steel and concrete, respectively. The authors have made conclusions about the possibility of using steel 09G2S in silo towers as a suitable sustitute for steel 65G and the sufficient efficiency of the chosen enameling technology.

Lutowanie wiązką elektronów na przykładzie stali austenitycznej odpornej na korozję – AISI 304

Electron beam brazing is a joining technology combining the advantages of a precisely controlled heat source and those of vacuum brazing process. The oxide layer decomposes in high-temperature vacuum conditions, which improves the wetting process and, consequently, leads to the obtainment of more favourable properties of the brazed joint. In comparison with brazing in vacuum furnaces, the electron beam brazing process enables the precise heating of selected areas without the necessity of heating the entire element, which, in turn, results in smaller structural changes in the brazed material and the lower consumption of energy. During tests discussed in this article, sheets made of stainless steel AISI 304 were brazed using various copper and silver filler metals. Brazed joints were subjected to microstructural tests and shear strength tests. The results revealed the high efficiency of the electron beam brazing of corrosion-resistant steel sheets using filler metals.

Anisotropy of the effective elastic modulus of a steel plate with a lattice of circular holes

Plates with a doubly periodic commensurate lattice of circular holes are studied. The plates are cut from a corrosion-resistant steel sheet along and across the rolling direction. Uniaxial tensile tests are performed, and the effective elastic modulus is determined for longitudinal and transverse plates with various lattice orientations with respect to the longitudinal axis of a plate. The experimental and calculated results agree well.

High-temperature internal nitriding of heavy-section steel products

A method for the internal nitriding of 0.08C-17Cr-0.5Ti corrosion-resistant steel sheets more than 2.5 mm thick has been suggested. The procedure includes the high-temperature nitriding of thin sheets, their hot pressing, and annealings. After such a treatment, the microhardness magnitude demonstrates the uniform distribution across the sheet section and reaches 280 HV. The formed structure of the material is characterized by a grain size of 0.5 µm and the presence of chromium-nitride particle precipitates. Compression tests showed that the prepared samples are deformed as a monolithic material; no cracks and laminations are formed on the surface.

A Preliminary Study of the Effect of Surface Texture on Algae Cell Attachment for a Mechanical-Biological Energy Manufacturing System

A grand vision of an algal biofuel energy manufacturing system is presented here. The proposed system, from manufacturing engineering and system points of view, aims to provide technical solutions to two major challenges that the algal biofuel industry faces, i.e., low productivity and energy intensive harvesting and drying, which result in prohibitively high costs. The proposed idea is to have an integrated “conveyor belt” system floating on the water surface powered by windmills or a hybrid energy source. The conveyor belt is made of corrosion-resistant steel sheets that have microdimple surface features to significantly enhance the attachment of algae cells to the “belt” compared with a surface without microdimple features. The grown algae on the belt will then be mechanically scraped off, collected, dried, and squeezed for oil extraction. This paper addresses one of many fundamental problems in this vision, i.e., whether algae can grow effectively on textured stainless steel surfaces. Through both static and dynamic tests, it was found that the growth of algae on textured surfaces was several times more active than that on a flat sample.

Improving the quality of titanium-free corrosion-resistant steel sheet

At OAO ChMK, corrosion-resistant steel is smelted by a duplex process, in an arc smelting furnace and an argon–oxygen refining unit. After correcting the chemical composition and temperature in an integrated processing unit, melt of mass 100 t is cast on a radial continuous-casting machine to slab billet (mass 4–7.5 t). The mold dimensions are 1100–1550 × 170 mm; provision is made for protection of the metal jet from oxidation under slag-forming mixture. After trimming, the slabs are hotor cold-rolled to sheet of thickness 0.8– 25 mm.

流体支持型電解法による自動車用防錆鋼板の製造方法

流体支持型電解法による自動車用防錆鋼板の製造方法

Development of new corrosion-resistant steel sheets for automobiles.

Three new types of corrosion-resistant steel sheets for automotive body panels have been developed.1) Zinc-nickel alloy electroplated steel sheet2) Two-layer zinc-iron alloy electroplated steel sheet3) Organic composite-coated steel sheetWith their protective coating alloyed, applied in two layers or composited, these corrosion-resistant steel sheets have excellent corrosion resistance and paintability for relatively low coating weight. Their formability, weldability and other properties are also balanced well. This report mainly describes the development concept and quality performance of each of the new types of corrosion-resistant sheets.