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    • 4. 发明公开
    • 자기 특성이 매우 우수한 방향성 전자 강판의 제조 방법
    • 具有优异磁性性能的面向导向的磁性钢板的工艺
    • KR1020080100245A
    • 2008-11-14
    • KR1020087021852
    • 2007-01-12
    • 신닛테츠스미킨 카부시키카이샤엔에스 플랜트 디자이닝 코포레이션
    • 구마노도모지야마자키슈이치다나카오사무
    • C21D8/12C22C38/00
    • C23C8/02B21B3/02C21D8/12C21D8/1261C21D8/1272C21D9/46C22C38/008C22C38/02C22C38/04C22C38/20C23C8/26C23C8/80H01F1/14775
    • A process for producing a complete-solid-solution nitride type grain-oriented magnetic steel sheet which has a high magnetic flux density, satisfactory glass coatability, and excellent magnetic properties. The process comprises: hot-rolling a steel slab containing 2.5-4.0% silicon and containing acid-soluble aluminum to obtain a hot-rolled steel strip in which the proportion of nitrogen separated out as AlN to the nitrogen contained in the strip is 20% or lower; annealing and cold-rolling the hot-rolled sheet; subsequently subjecting it to decarburization annealing in an atmosphere in which PH2O/PH2 in the front half is 0.30-0.70 and that in the back half is 0.20 or less to thereby regulate primary recrystallized grains so as to have an average equivalent-circle diameter of 7-18 mum; subsequently nitriding the strip in a running state in a gas mixture comprising hydrogen, nitrogen, and ammonia; thereafter regulating the oxygen in the steel sheet before secondary recrystallization annealing to 450-700 ppm in terms of oxygen amount per 0.30 mm-thick sheet (So); subsequently applying an annealing release agent; and then conducting secondary recrystallization annealing in a hydrogen atmosphere which contains 25-75% nitrogen and in which the temperatures at the hottest points on the periphery of a coil range from room temperature to 950°C and the PH2O/PH2 is 0.01-0.15.
    • 一种具有高磁通密度,令人满意的玻璃涂布性和优异的磁特性的完全固溶氮化物型晶粒取向电磁钢板的制造方法。 该方法包括:将含有2.5-4.0%硅并含有酸溶性铝的钢坯热轧,得到其中分离为AlN的氮的比例与条中所含的氮的比例为20%的热轧钢带, 或更低; 退火和冷轧热轧板; 随后将其在前半部分中的PH 2 O / PH 2为0.30-0.70,后半部分为0.20以下的气氛中进行脱碳退火,从而调整一次再结晶晶粒,使其平均当量圆直径为7 -18妈妈 随后在包含氢,氮和氨的气体混合物中以条件运行状态渗氮; 然后将二次再结晶退火前的钢板中的氧量调整为每0.30mm厚的片材的氧量为450〜700ppm(So); 随后应用退火脱模剂; 然后在含有25-75%氮气的氢气气氛中进行二次再结晶退火,其中线圈周边最热点温度范围为室温至950℃,PH2O / PH2为0.01-0.15。
    • 6. 发明公开
    • 자속 밀도가 높은 방향성 전자기 강판의 제조 방법
    • 生产具有高磁通密度的晶粒磁性钢板的工艺
    • KR1020080107423A
    • 2008-12-10
    • KR1020087023027
    • 2007-05-23
    • 신닛테츠스미킨 카부시키카이샤
    • 우시가미요시유끼후지이노리까즈구마노도모지
    • C21D8/12C22C38/02
    • C21D8/12C21D8/1255C21D8/1261C21D9/46C23C8/26H01F1/14775H01F1/14791H01F1/16
    • A process for producing a grain-oriented magnetic steel sheet in which slab heating is conducted at a temperature of 1,350‹C or lower and the annealing of a hot-rolled sheet is conducted: (a) in a step in which the hot-rolled sheet is heated to a given temperature of 1,000-1,150‹C to cause recrystallization and then annealed at a temperature of 850-1,100‹C lower than that temperature or (b) by decarburizing the hot-rolled sheet during annealing so that the difference in carbon content between the steel sheet before the annealing and that after the annealing is 0.002-0.02 mass% and the heating in the decarburization/annealing is conducted under such conditions that the heating rate during the period when the temperature of the steel sheet is in the range of 550-720‹C is 40 ‹C/sec or higher, preferably 75-125 ‹C/sec. Induction heating is used for the rapid heating in the heating step in the decarburization/annealing. ® KIPO & WIPO 2009
    • 制造在1350℃以下进行板坯加热并进行热轧板退火的晶粒取向电磁钢板的制造方法:(a)在热轧后的步骤 将片材加热至给定温度为1000-1,150℃以进行再结晶,然后在比该温度低850-1100℃的温度下退火,或(b)通过在退火过程中对热轧板进行脱碳,使得 退火前的钢板和退火后的钢板的碳含量为0.002〜0.02质量%,脱碳/退火时的加热是在钢板的温度为 550-720℃的范围为40℃/秒以上,优选为75〜125℃/秒。 感应加热用于脱碳/退火中的加热步骤中的快速加热。 ®KIPO&WIPO 2009