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    • 1. 发明公开
    • 용강의 정련 방법 및 이를 이용한 쾌삭강의 제조 방법
    • 精炼热金属的方法及使用其制造自由切割钢的方法
    • KR1020130047135A
    • 2013-05-08
    • KR1020110111971
    • 2011-10-31
    • 주식회사 포스코
    • 이동렬박진홍김용태
    • C21C7/10C21C7/04
    • C21C7/10B22D11/113C21C7/0025C21C7/072C21C2300/04
    • PURPOSE: A method for refining molten steel and a method for manufacturing free-cutting steel using the same are provided to insert a re-carburizer in an RH(Reinstahl Huten Werke Heraus) step, thereby minimizing decarburization and deoxidation due to the reaction between carbon and oxygen. CONSTITUTION: A method for refining molten steel includes: a step of preparing the molten steel; a step(S210) of dehydrogenating the molten steel using an RH(Reinstahl Huten Werke Heraus); and a step(S220) of feeding a re-carburizer inside the molten steel when the pressure inside the RH is maintained between 50 and 150 torrs. In the step(S210), the pressure inside the RH is maintained at 2 torrs or less, and inert gas is fed into the RH. In the step(S220), the number of times for feeding the total desired amount of the re-carburizer is multiple. [Reference numerals] (AA) Start; (BB) End; (S210) Dehydrogenation; (S220) Re-carburizer input under a pressure of 50-150 torr and carbon(C) concentration control
    • 目的:提供一种精炼钢水的方法和使用该方法制造切削钢的方法,以在RH(Reinstahl Huten Werke Heraus)步骤中插入再渗碳剂,由此最小化由碳之间的反应引起的脱碳和脱氧 和氧气。 构成:用于精炼钢水的方法包括:制备钢水的步骤; 使用RH(Reinstahl Huten Werke Heraus)使钢水脱氢的工序(S210); 以及当RH内的压力保持在50〜150托之间时,在钢水内供给再渗碳器的工序(S220)。 在步骤(S210)中,RH内的压力维持在2乇以下,惰性气体供给RH。 在步骤(S220)中,供给总期望量的再渗碳器的次数是多次。 (附图标记)(AA)开始; (BB)结束; (S210)脱氢; (S220)在50-150托的压力和碳(C)浓度控制下的再渗碳输入
    • 3. 发明公开
    • 고청청 베어링강의 제조방법
    • 制造高清洁轴承钢的方法
    • KR1020090073504A
    • 2009-07-03
    • KR1020070141467
    • 2007-12-31
    • 주식회사 포스코
    • 박진홍구경회민중기
    • C21C7/00C21C7/04C21C5/28C22C1/02
    • C21C7/0087C21C7/06C21C7/068
    • A method for manufacturing high-cleaness bearing steel is provided to prevent blocking of the nozzle and extend the service life by forming slag with high inclusion capturing performance. A method for manufacturing high-cleaness bearing steel comprises a step of decarburizing molten steel in blowing of a converter(S10), a step of putting in an additive during tapping of the molten steel to control CaO/SiO2 of the slag to 5~10 and CaO/Al2O3 of the slag to 1.5~2.0(S20), a step of putting in an additive to maintain the CaO/SiO2 and CaO/Al2O3 of the slag while heating a ladle in a ladle furnace process(S30), and a step of increasing the content of sulfur to 0.003~0.007% in a RH(Ruhrstahl-Heraess) process of molten steel(S40).
    • 提供高清洁轴承钢的制造方法,以防止喷嘴的堵塞,并且通过形成具有高夹杂捕获性能的炉渣来延长使用寿命。 高洁净轴承钢的制造方法包括在转炉中吹塑钢水的步骤(S10),在钢水出料时加入添加剂的步骤,将炉渣的CaO / SiO 2控制在5〜10 和CaO / Al2O3的比例为1.5〜2.0(S20),在钢包炉加工中,在加热钢包的同时,添加添加剂以维持炉渣的CaO / SiO 2和CaO / Al 2 O 3的步骤(S30), 在钢水RH(Ruhrstahl-Heraess)工艺中,将硫含量提高到0.003〜0.007%的步骤(S40)。
    • 6. 发明公开
    • 내부 품질이 우수한 신선용 고탄소강 선재의 주편 제조방법및 그 방법에 의하여 제조된 주편
    • 生产高碳内胆质量的布线的高碳钢丝绳的生产方法及其生产的
    • KR1020100063896A
    • 2010-06-14
    • KR1020080122260
    • 2008-12-04
    • 주식회사 포스코
    • 박병주박진홍
    • B22D11/117B22D11/116B22D11/16
    • PURPOSE: A bloom of high carbon steel wire rod for wire drawing with superior internal quality and a manufacturing method thereof are provided to prevent disconnection due to surface defect during wire drawing by minimizing blisters in the inner superficial layer. CONSTITUTION: A manufacturing method of a bloom of high carbon steel wire rod comprises the steps of: retaining a superheat temperature of 15~35°C compared to theoretical congelation temperature, carrying out continuous casting at 0.4~0.7 m/min, and blowing tundish stopper Ar gas flow at 3.0~5.0 1 min. The molten steel comprises C 0.6~1.0 weight%, Si 0.1~0.5 weight%, Mn 0.1~1.0 weight%, P 0.03 weight%, S 0.03 weight% or less, Al 0.02 weight%, and the rest Fe and an inevitable impurity, where the inevitable impurity includes H of 7ppm or less.
    • 目的:提供一种用于具有优良内部品质的拉丝用高碳钢线材及其制造方法,以通过使内表面层中的水泡最小化来防止拉丝时的表面缺陷导致的断开。 构成:高碳钢线材的制造方法包括以下步骤:与理论凝结温度相比,保持15〜35℃的过热温度,以0.4〜0.7m / min的连续铸造,中间包 阻塞Ar气流在3.0〜5.0 1 min。 该钢水含有C 0.6〜1.0重量%,Si 0.1〜0.5重量%,Mn 0.1〜1.0重量%,P 0.03重量%,S 0.03重量%以下,Al 0.02重量%,剩余的Fe和不可避免的杂质 ,其中不可避免的杂质包括7ppm以下的H。
    • 7. 发明公开
    • 대단면 연강 빌레트의 제조 방법
    • 一种制造含有低碳且具有大横截面的高级玻璃杯的方法
    • KR1020090072476A
    • 2009-07-02
    • KR1020070140603
    • 2007-12-28
    • 주식회사 포스코
    • 민중기박진홍서정도
    • C21C7/00C21C5/52C21C3/00B22D11/00
    • Y02P10/216C21C7/00B22D11/00C21C3/00C21C5/52
    • A method for manufacturing a soft steel billet having a large cross section is provided to prevent nozzle from closing or surface quality defect like a pinhole by steadily controlling C and Si in a refining process of steel including C and Si. A method for manufacturing a soft steel billet having a large cross section comprises: a step(S10) blowing molten steel in a converter; a step(S20) controlling the carbon content of the blown molten steel over 04 weight%; a step(S30) degasifying the molten steel; and a step(S40) of refining the carbon content of the degasified molten steel below 0.07 weight% and the oxygen content of the degasified molten steel below 0.007 weight%. The step of blowing the molten steel in the converter comprises a step of blowing the carbon content of the molten steel below 0.07 weight%.
    • 提供了具有大横截面的软钢坯的制造方法,通过在包括C和Si的钢的精炼过程中稳定地控制C和Si来防止喷嘴闭合或类似针孔的表面质量缺陷。 一种具有大截面的软钢坯的制造方法,其特征在于,包括:在转炉中吹入钢水的工序(S10) 控制吹制钢水的碳含量超过04重量%的步骤(S20) (S30)使钢水脱气; 以及将脱气钢水的碳含量优选为0.07重量%以下,将脱气钢水的氧含量调整为0.007重量%以下的工序(S40)。 在转炉中吹入钢水的步骤包括使钢水中的碳含量低于0.07重量%的步骤。