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    • 6. 发明公开
    • 린 듀플렉스 스테인리스강
    • LEAN双相不锈钢
    • KR1020130060658A
    • 2013-06-10
    • KR1020110126839
    • 2011-11-30
    • 주식회사 포스코
    • 최점용박경태
    • C22C38/00C22C38/34C22C38/42C22C38/58
    • C22C38/58C21D2211/001C21D2211/005C22C38/001C22C38/34C22C38/42C22C38/44
    • PURPOSE: A lean duplex stainless steel is provided to improve machinability by controlling phase fraction of ferrite and austenite and by obtaining corrosion resistance and simultaneously obtaining elongation percentage of high ductility of over 50 %. CONSTITUTION: A lean duplex stainless steel is comprised of below 0.08 % of C, below 0.2-3.0 % of Si, 2-4 % of Mn, 19-23 % of Cr, 0.3 %-2.5 % of Ni, 0.2-0.3 % of N, 0.5-2.5 % of Cu, a residual Fe, and unavoidable impurities. The stainless steel is comprised of 0.1-1.0 % of weight %. The stainless steel is comprised of ferrite of 55~25% and austenite of 45-75 % in the volume fraction. The content of the plasticity organic martensite is below 5% in the stainless steel. The stainless steel includes elongation percentage of over 50 %. [Reference numerals] (AA) Nominal stress(MPa); (BB) Comparative example 5; (CC) Example 2; (DD) Example 7; (EE) Example 6; (FF) Comparative example 2; (GG) Example 11; (HH) Example 5; (II) Example 8; (JJ) Example 4; (KK) Comparative example 1; (LL) Nominal transformation(%)
    • 目的:提供精密双相不锈钢,通过控制铁素体和奥氏体的相分数,获得耐腐蚀性,同时获得超过50%的高延展性的伸长率,提高机械加工性。 构成:贫二相不锈钢由低于0.08%的C,低于0.2-3.0%的Si,2-4%的Mn,19-23%的Cr,0.3%-2.5%的Ni,0.2-0.3% 的N,0.5〜2.5%的Cu,残留的Fe和不可避免的杂质。 不锈钢由重量%的0.1-1.0%组成。 不锈钢由体积分数为55〜25%的铁素体和45-75%的奥氏体构成。 不锈钢中可塑性有机马氏体含量低于5%。 不锈钢的伸长率超过50%。 (标号)(AA)公称应力(MPa); (BB)比较例5; (CC)实施例2; (DD)实施例7; (EE)实施例6; (FF)比较例2; (GG)实施例11 (HH)实施例5; (II)实施例8 (JJ)实施例4 (KK)比较例1; (LL)标称变换(%)
    • 7. 发明授权
    • 고강도 이상복합조직강 제조방법
    • 고강도이상복합조직강제조방법
    • KR100401985B1
    • 2004-02-18
    • KR1019980052144
    • 1998-12-01
    • 주식회사 포스코
    • 박경태박수동
    • C21D8/08
    • PURPOSE: A method of manufacturing a two-phase composite steel is provided to secure high strength for a tempered martensite single-phase structure under the same chemical elements through heat treatment. CONSTITUTION: A rod wire consists of 0.10-0.35wt% of carbon, 0.10-0.30wt% of silicon, 0.50-2.0wt% of manganese, 0.50-2.0wt% of chromium, 0.01-1.0wt% of molybdenum, 0.001-0.005wt% of boron, less than 0.015wt% of phosphorus, less than 0.01wt% of sulfur and the rest of iron and other impurities. The rod wire is cold-rolled and austenitized at a temperature of 930-970°C for 15-30 minutes. After that, the rod wire is quenched, kept regular to secure 10-40% of lower bainite fraction and tempered.
    • 目的:提供一种制造双相复合钢的方法,以通过热处理确保在相同化学元素下的回火马氏体单相结构的高强度。 构成:棒线由0.10-0.35重量%的碳,0.10-0.30重量%的硅,0.50-2.0重量%的锰,0.50-2.0重量%的铬,0.01-1.0重量%的钼,0.001-0.005 硼的重量百分比,磷的重量百分比小于0.015%,硫的重量百分比小于0.01%,剩余的铁和其它杂质。 棒线在930-970℃的温度下冷轧和奥氏体化15-30分钟。 之后,棒线淬火,定期保证10-40%的下贝氏体分数并回火。
    • 8. 发明授权
    • 신선가공성이 우수한 연강선재의 제조방법
    • 低碳钢丝绳制造方法,优良的线材绘图性能
    • KR100256349B1
    • 2000-05-15
    • KR1019950030088
    • 1995-09-14
    • 주식회사 포스코
    • 최해창박경태박수동정의경
    • C21D8/06
    • PURPOSE: A method for manufacturing a mild steel wire rod for ultra fine wire having superior rod drawability is provided not only to decrease distribution of non-metallic inclusions influencing adverse effect on the generation of the snapping of a wire during the wire drawing of the ultra fine wire but also solve the problems of coarsening during annealing heat treatment, and formation and growth of the crystal grains by properly controlling aluminum constituent in the steel and a temperature of the heat treatment during the annealing heat treatment after the wire drawing. CONSTITUTION: In a method for manufacturing a mild steel wire rod for ultra fine wire, the method for manufacturing a mild steel wire rod having superior rod drawability comprises the processes of wire drawing the wire rod after manufacturing a steel billet comprising 0.003 to 0.05 wt.% of C, 0.1 to 0.3 wt.% of Mn, 0.02 wt.% or less of P, 0.02 wt.% or less of S, 0.03 to 0.08 wt.% of Al, and a balance of Fe and inevitable impurities into a wire rod; and finally wire drawing the annealing heat treated wire rod after annealing heat treating the drawn wire rod in the temperature range of 630 to 680 deg.C.
    • 目的:提供一种具有优良棒拉拔性的超细金属丝的低碳钢线材的制造方法,不仅可以减少非金属夹杂物在超拉丝拉丝过程中对导线的咬合产生不利影响的分布 并且还解决了退火热处理期间粗大化的问题,并且通过适当地控制钢中的铝成分和拉丝后的退火热处理期间的热处理温度来形成和生长晶粒。 构成:在用于制造超细金属丝的低碳钢线材的方法中,制造具有优异棒拉拔性的低碳钢线材的方法包括在制造含有0.003至0.05重量%的钢坯之后拉丝线材的方法。 的C%,Mn:0.1〜0.3重量%,P:0.02重量%以下,S:0.02重量%以下,Al:0.03〜0.08重量%,余量:Fe和不可避免的杂质: 线材 最后在630〜680℃的温度范围内退火热处理拉丝线材后退火热处理线材拉丝。