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    • 51. 发明公开
    • 고강도 고인성 선재 및 그 제조방법
    • 具有高强度和坚固性的线及其制造方法
    • KR1020110014852A
    • 2011-02-14
    • KR1020090072423
    • 2009-08-06
    • 주식회사 포스코
    • 이유환김동현
    • B21B1/16B21C1/00C21D7/13C21D8/06
    • PURPOSE: A wire rod with high-strength and high-toughness and a manufacturing method thereof are provided to secure tensile strength which is a match for alloy steel by warm-rolling or warm-drawing carbon steel. CONSTITUTION: A manufacturing method of a wire rod with high-strength and high-toughness is as follows. A carbon steel material is rolled or drawn at a temperature range right below transformation temperature from austenite to pearlite. The temperature range right below transformation temperature is 500~650°C. A reduction ratio of the carbon steel material is 30~90% during rolling or drawing.
    • 目的:提供一种具有高强度和高韧性的线材及其制造方法,以通过温轧或热拉伸碳钢来确保与合金钢相匹配的拉伸强度。 构成:具有高强度和高韧性的线材的制造方法如下。 在低于相变温度的温度范围内将碳钢材料从奥氏体轧制或拉制成珠光体。 转换温度以下的温度范围为500〜650℃。 轧制或拉伸时,碳钢材料的减速比为30〜90%。
    • 53. 发明授权
    • 승온 속도에 따른 수소의 방출 속도를 이용한 금속학적수소의 트랩 활성화에너지의 측정방법
    • 使用加氢氢排放速率测量金属中金属的捕获活化能的方法
    • KR100862850B1
    • 2008-10-09
    • KR1020070112654
    • 2007-11-06
    • 주식회사 포스코
    • 이유환이종수김지수이덕락
    • C21C7/00G01N33/00
    • G01N33/206C21C7/00G01N2015/0011
    • A method for measuring trap activation energy of metallic hydrogen using a hydrogen discharging speed based on heating is provided to measure the trap activation energy of metallic hydrogen in the steel, using a thermal differential analysis device, thereby improving anti-hydrogen delayed fracture. A method for measuring trap activation energy of metallic hydrogen using a hydrogen discharging speed(Phi) based on heating comprises the steps of: differentiating the hydrogen discharging speed based on heating with regard to a steel sample and measuring critical temperature corresponding to maximum hydrogen discharging speed through thermal differential analysis(S100); obtaining a slope of 1n(Phi/Tc^2) vs (1/Tc) graph, using a plurality of hydrogen discharging speeds and a critical temperature(Tc) based on the speeds(S200); and obtaining the trap activation energy of metallic hydrogen from the slope of the graph(S300).
    • 提供了使用基于加热的氢气排出速度来测量金属氢的陷阱活化能的方法,以使用热差分分析装置测量钢中金属氢的捕集活化能,从而改善抗氢延迟断裂。 使用基于加热的氢气排出速度(Phi)测量金属氢的陷阱活化能的方法包括以下步骤:基于对钢样品的加热来区分氢气排出速度并测量对应于最大氢气排出速度的临界温度 通过热差分析(S100); 使用多个氢排放速度和基于速度的临界温度(Tc)获得1n(Phi / Tc ^ 2)vs(1 / Tc)图的斜率(S200); 并从图的斜率获得金属氢的捕集活化能(S300)。
    • 59. 发明公开
    • 수소지연파괴 저항성이 우수한 선재와 그 제조방법 및 이를 이용한 고강도 볼트와 그 제조방법
    • 具有氢延迟断裂的良好电阻的钢丝绳及其制造方法和使用其的高强度螺栓的方法和用于制造螺栓的方法
    • KR1020130009248A
    • 2013-01-23
    • KR1020110070206
    • 2011-07-15
    • 주식회사 포스코
    • 이유환김동현류근수
    • C22C38/00C21D8/06C21D9/00
    • C21D9/0093C21D8/065C21D9/525C22C38/005C22C38/02C22C38/04C22C38/08C22C38/12
    • PURPOSE: A wire rod having an excellent hydrogen delayed fracture resistance and a manufacturing method thereof, and a high-strength bolt using the same and a manufacturing method thereof are provided to improve the safety of a steel structure by enhancing a fastening force and reducing vacancies in bolt fastening, and decrease the use amount of steel materials by reducing the number of the bolt fastenings. CONSTITUTION: A wire rod having an excellent hydrogen delayed fracture resistance includes 0.3 to 0.7 wt% of C, 0.05 to 2.0 wt% of Si, 0.7 to 1.5 wt% of Mn, 30 to 70 ppm of La, 0.01 to 0.1 wt%, remnant Fe and other inevitable impurities. The wire rod includes La series, Ni series or LaNi system precipitate. The aspect ratio of the precipitate is 1.2 to 2.0. The circle equivalent particle diameter of the precipitate is 100 to 400 nanometers. The precipitate is more than one kind of LaNi5, LaPO4 and La2O2S. A manufacturing method of the wire rod comprises: A step of heating a steel material at the temperature of Ae3+150 to Ae3+250 Celsius degrees; a step of cooling the steel material with cooling velocity of 5 to 15 Celsius per second and rolling it at the temperature of Ae3+50 to Ae3+150 Celsius degrees in order to manufacture the wire rod; and a step of cooling the rolled wire rod to the temperature of less than 600 Celsius degrees with cooling velocity of 0.5 to 3 Celsius per second.
    • 目的:提供具有优异的氢延迟断裂阻力的线材及其制造方法,以及使用该线材的高强度螺栓及其制造方法,以通过增强紧固力和减少空位来提高钢​​结构的安全性 在螺栓紧固中,通过减少螺栓紧固件的数量减少钢材的使用量。 构成:具有优异的氢延迟断裂性的线材包括C:0.3〜0.7重量%,Si:0.05〜2.0重量%,Mn:0.7〜1.5重量%,La:30〜70ppm,0.01〜0.1重量% 残余铁等不可避免的杂质。 线材包括La系列,Ni系或LaNi系沉淀。 沉淀物的纵横比为1.2〜2.0。 沉淀物的圆当量粒径为100〜400纳米。 沉淀物是多种LaNi5,LaPO4和La2O2S。 线材的制造方法包括:将Ae3 + 150的温度下的钢材加热至Ae3 + 250℃的步骤; 为了制造线材,以5〜15摄氏度/秒的冷却速度冷却钢材,在Ae3 + 50〜Ae3 + 150摄氏度的温度下进行轧制, 以及以0.5〜3摄氏度/秒的冷却速度将卷绕的线材冷却至小于600摄氏度的温度的步骤。