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    • 5. 发明授权
    • 오스테나이트계 스테인리스 냉연강판을 제조하기 위한 저온 고속 산세 프로세스
    • 用于奥氏体不锈钢条的低温高速切割工艺
    • KR101353856B1
    • 2014-01-21
    • KR1020120084150
    • 2012-07-31
    • 주식회사 포스코
    • 김진석이용헌김지훈
    • C23G1/08C23G3/00
    • C23G1/08C09K13/08C22C38/40C23G1/081C23G1/086C25F1/06
    • The present invention relates to a method for pickling a surface of a steel plate with a mixed acid solution without nitric acid in low temperatures at a high speed for manufacturing an austenite type stainless cold rolled steel plate which needs a high surface quality. Provided is a high chrome austenite type stainless cold rolled steel plate for removing a silicon oxide from a cold rolled steel plate by dipping the cold rolled steel plate in a mixed acid solution which practically does not contain an iron ion, and contains 110-150 g/l of sulfuric acid, 25-40 g/l of free hydrofluoric acid, and more than or equal to 5.5 g/l of a hydrogen peroxide concentration in an initial composition, and does not contain nitric acid. According to the present invention, since nitric acid is not contained when an austenite type stainless cold rolled steel plate is pickled, the process is capable of reducing burden of installation of DeNOx facilities, and NOx removal facilities. Furthermore, the process is easily controlled, and suitable for high speed manufacture since pickling can be controlled by a hydrogen peroxide concentration and a hydrofluoric acid concentration. After pickling, since a quality is increased in comparison with a conventional pickling method, an austenite type stainless cold rolled steel plate with an excellent quality can be manufactured. [Reference numerals] (AA) Valid hydrogen peroxide concentration (g/L); (BB) Iron ion concentration (g/L)
    • 本发明涉及一种用于制造需要高表面质量的奥氏体型不锈钢冷轧钢板,在高温下用无硝酸混合酸溶液酸洗钢板表面的方法。 本发明提供一种高铬奥氏体型不锈钢冷轧钢板,其通过将冷轧钢板浸渍在实际上不含铁离子的混合酸溶液中,从冷轧钢板中除去氧化硅,并含有110-150g / l的硫酸,25-40g / l的游离氢氟酸,以及在初始组合物中多于或等于5.5g / l的过氧化氢浓度,并且不含有硝酸。 根据本发明,当奥氏体型不锈钢冷轧钢板酸洗时,不含有硝酸,因此能够减少DeNOx设备的安装负担和NOx去除设备。 此外,该方法容易控制,并且适用于高速制造,因为酸洗可以通过过氧化氢浓度和氢氟酸浓度来控制。 酸洗后,由于与现有的酸洗方法相比质量提高,所以可以制造质量优异的奥氏体型不锈钢冷轧钢板。 (附图标记)(AA)有效的过氧化氢浓度(g / L); (BB)铁离子浓度(g / L)
    • 6. 发明公开
    • 스테인리스강의 산세 및 표백을 위한 표면처리조성물과 이를 이용한 표면처리방법
    • 用于不锈钢酸洗和漂白的表面处理组合物,使用其表面处理方法
    • KR1020120133534A
    • 2012-12-11
    • KR1020110052227
    • 2011-05-31
    • 선종철
    • 선종철
    • C23G1/08
    • C23G1/081C09K13/04
    • PURPOSE: A surface treatment composition for pickling and bleaching stainless steel and a surface treatment method using the same are provided to prevent the production of effluent containing odor, toxic gas, and nitric nitrogen by using sulfuric acid and sodium fluoride instead of nitric acid and hydrofluoric acid. CONSTITUTION: A surface treatment composition for pickling and bleaching stainless steel comprises 60-80wt.% of water, 10-30wt.% of sulfuric acid, 3-8wt.% of sodium fluoride, and 3-5wt.% of sodium chlorate. The surface treatment composition also includes polyaluminum chloride for accelerating reaction.
    • 目的:提供用于酸洗和漂白不锈钢的表面处理组合物和使用其的表面处理方法,以通过使用硫酸和氟化钠代替硝酸和氢氟酸来防止产生含有气味,有毒气体和硝酸的流出物 酸。 构成:用于酸洗和漂白不锈钢的表面处理组合物包含60-80重量%的水,10-30重量%的硫酸,3-8重量%的氟化钠和3-5重量%的氯酸钠。 表面处理组合物还包括用于促进反应的聚氯化铝。
    • 9. 发明公开
    • 페라이트계 스테인레스강의 산세방법
    • 用于制造不锈钢的方法
    • KR1020010057230A
    • 2001-07-04
    • KR1019990059423
    • 1999-12-20
    • 주식회사 포스코
    • 류승기하헌재
    • C23G1/00
    • C23G1/086C21D2211/005C23G1/081C23G1/085C23G1/32
    • PURPOSE: A pickling method is provided which improves pickling property and productivity, and produces Ferritic stainless steel having superior gloss and surface quality by applying a mixed acid (nitric acid+hydrofluoric acid) pickling method instead of an existing nitric acid electrolytic pickling method to the pickling of a Ferritic stainless steel. CONSTITUTION: In a method for pickling a Ferritic stainless steel having 18 Cr or more which is annealed after cold rolling, the method for pickling the Ferritic stainless steel comprises the processes of pretreating the stainless steel in an alkaline molten salt of 450 to 500 deg.C; first pickling the pretreated stainless steel in a sulfuric acid solution having a temperature of 45 to 60 deg.C and a concentration of 5 to 10%; and second pickling the first pickled stainless steel in a mixed acid solution containing 6 to 10 wt.% of nitric acid and 0.3 to 1.2 wt.% of hydrofluoric acid at a temperature of 40 to 55 deg.C.
    • 目的:提供酸洗方法,其改善酸洗性能和生产率,并且通过将混酸(硝酸+氢氟酸)酸洗方法代替现有的硝酸电解酸洗方法生产具有优异的光泽度和表面质量的铁素体不锈钢 酸洗不锈钢铁素体。 构成:在冷轧后进行退火的具有18Cr以上的铁素体不锈钢的酸洗方法中,铁素体不锈钢的酸洗方法包括在450〜500℃的碱性熔融盐中预处理不锈钢的方法。 C; 首先将预处理的不锈钢酸洗在温度为45〜60℃,浓度为5〜10%的硫酸溶液中; 在40〜55℃的温度下,将第一酸洗不锈钢第二次酸洗至含有6〜10重量%硝酸和0.3〜1.2重量%氢氟酸的混合酸溶液中。