摘要:
A composition including HCl, urea, complex substituted keto-amine-hydrochloride, an alcohol, an ethoxylate, and a ketone is provided in a method for solubilizing calcium carbonate in an aqueous suspension or dispersion of calcium carbonate.
摘要:
The present invention relates to an acidic aqueous solution suitable for the pickling of stainless steel grades that comprises accelerators based on water soluble inorganic compounds comprising at least one nitrogen atom in an oxidation state in the range of −2 to −⅓. The present invention further encompasses a process for the pickling of stainless steel that makes use of a pickling solution comprising the above-mentioned accelerators.
摘要:
A method for coating a hot-rolled or cold-rolled steel flat product, containing 6-30% wt. Mn, with a metallic protective layer by hot-clip coating in a melt bath. The coating, achieved with increased production reliability, is optimised by the steel flat product being subjected to a pickling treatment in which the manganese oxide adhering to the steel flat product is essentially fully removed in the pickling bath before the steel flat product enters the melt bath.
摘要:
A high-strength cold-rolled steel sheet having high chemical convertibility and a tensile strength of 590 MPa or more and a method for producing such a steel sheet are provided. The steel sheet contains, in terms of percent by mass, C: 0.05 to 0.3%, Si: 0.6 to 3.0%, Mn: 1.0 to 3.0%, P: 0.1% or less, S: 0.05% or less, Al: 0.01 to 1%, N: 0.01% or less, and the balance being Fe and unavoidable impurities. The coverage ratio of reduced iron on a steel sheet surface is 40% or more. In order to produce such a steel sheet, an oxidation treatment is performed after cold rolling. Subsequently, annealing is conducted in a furnace in a 1 to 10 vol % H2+balance N2 gas atmosphere with a dew point of −25° C. or less.
摘要:
The present invention is a method of pickling of steel plate which contains silicon comprising applying ultrasonic waves of at least two types of frequencies of 28.0 kHz or more to less than 1.0 MHz to an acidic cleaning solution which contains microbubbles and, in that state, dipping the steel plate which contains silicon in that cleaning solution. The present invention is a continuous pickling system of steel plate which contains silicon which is provided with at least a support part which supports the steel plate, a conveyor which makes the steel plate move, and a pickling tank which pickles the steel plate, wherein the pickling tank has means for feeding microbubbles and means for applying ultrasonic waves of at least two types of frequencies of 28.0 kHz or more to less than 1.0 MHz.
摘要:
Methods are provided for descaling metallic components devices such as stents. The devices or components are cleaned under ultrasound in a cleaning solution of ammonium hydrogen fluoride at a temperature within a range of about 60° to 80° C., then rinsed at that temperature with an aqueous rinse containing a nonionic surfactant and rinsed again with purified water.
摘要:
The invention relates to a cold-rolled and annealed steel sheet with a strength greater than 1200 MPa, the composition of which comprises, the contents being expressed by weight: 0.10%≦C≦0.25%, 1%≦Mn≦3%, Al≧0.010%, Si≦2.990%, S≦0.015%, P≦0.1%, N≦0.008%, it being understood that 1%≦Si+Al≦3%, the composition optionally comprising: 0.05%≦V≦0.15%, B≦0.005%, Mo≦0.25%, Cr≦1.65%, it being understood that Cr+3Mo≧0.3%, Ti in an amount such that Ti/N≧4 and Ti≦0.040%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the microstructure of the steel comprising 15 to 90% bainite, the remainder consisting of martensite and residual austenite.
摘要:
Environment-friendly process for descaling, pickling and finishing/passivating in a continuous, integrated and flexible manner, applicable to any type of stainless steel, regardless of its physical structure, chemical composition and nature of surface oxides to be removed, within a single plant in which the required chemical, electrochemical, mechanical and hydromechanical treatments are carried out, merely diversifying the operative conditions of each treatment according to the stainless steel type to be processed. The process and the plant according to the invention allow elevated reaction rate, excellent surface quality, low energy and chemical reagent consumption and total environmental compatibility. The figure shows the block diagram of an embodiment of the plant according to the invention.
摘要:
A process is disclosed for the preparation of a steel surface for single-dip aluminium-rich zinc galvanizing. The process steps comprise: cleaning the surface so as to obtain less than 0.6 μg/cm2 residual dirt; pickling the surface; applying a protective layer to the surface by immersion in a flux solution comprising bismuth. This invention also relates to a continuous steel product coated with a layer of metallic bismuth.
摘要翻译:公开了用于制备用于单浸渍富铝锌镀锌的钢表面的方法。 工艺步骤包括:清洁表面以获得小于0.6mug / cm 2的残余污垢; 酸洗表面; 通过浸入包含铋的助熔剂溶液中将表面保护层施加。 本发明还涉及涂覆有金属铋层的连续钢产品。
摘要:
The invention relates to a method for pickling hot-rolled special steel strips (1) having an austenite, ferrite and/or martensite structure. The inventive method is carried out in a pickling line (7) with pickling sections (8) containing acids and rinsing sections (9) containing rinsing water (15). The aim of the invention is to provide a method that does not require an additional stretch-leveling step for descaling. The costs for pickling are reduced by pickling the hot-rolled special steel strip (1) in the pickling sections (8) with hydrochloric acid (13) and rinsing it in the first rinsing sections (9) with azotic acid (14) or an equivalent substitute pickling medium (14b) and treating it in further rinsing sections (9) with rinsing water (15).