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    • 31. 发明授权
    • 고온 내마모성 및 기계적 강도가 우수한 열간압연용 고탄소 단조 워크롤 및 이의 제조방법
    • 高温高温耐磨性和机械强度的热轧高碳钢锻造辊及其制造方法
    • KR101286121B1
    • 2013-07-17
    • KR1020120157801
    • 2012-12-31
    • 서한산업(주)
    • 권민기박영태민규영
    • B21K1/02B21K21/00B21J5/08C22C38/00
    • B21K1/02B21J5/08B21K21/00C21D1/28C22C38/04C22C38/34C22C38/44C22C38/46C22C38/56
    • PURPOSE: A high carbon forging work roll for hot rolling having an excellent wear resistance at high temperature and mechanical strength and a manufacturing method thereof are provided to implement a step of hot forging and a step of a heat treatment on the work roll at an optimal temperature range, thereby providing the high wear resistance at the high temperature to the work roll. CONSTITUTION: A manufacturing method of a high carbon forging work roll for hot rolling having an excellent wear resistance at high temperature and mechanical strength includes: a step of manufacturing an ingot; a hot forging step of forming the work roll with heating and forging the ingot in a heating furnace; and a heat treatment step of heat-treating the work roll with passing the work roll through a step of normalizing, a step of forcible cooling, and a step of tempering. The hot forging step includes: an initial hot forging step of sequentially implementing an upsetting process and a cogging process at a temperature of 950 to 1200°C; and a final hot forging step of implementing a finishing process at a temperature of 700 to 950°C. [Reference numerals] (AA) Start; (BB) End; (S100) Ingot manufacturing step; (S200) Work roll heating and forging step; (S300) Heat-treating step
    • 目的:提供在高温下具有优异的耐磨性和机械强度的用于热轧的高碳锻造工作辊及其制造方法,以实现热锻的步骤和在工作辊上的最佳热处理步骤 温度范围,从而在高温下对工作辊提供高耐磨性。 构成:在高温下具有优异的耐磨性和机械强度的用于热轧的高碳锻造工作辊的制造方法包括:制造锭的步骤; 在加热炉中加热和锻造锭的工作辊的热锻造步骤; 以及通过使工作辊通过标准化步骤,强制冷却步骤和回火步骤对工作辊进行热处理的热处理步骤。 热锻造步骤包括:在950〜1200℃的温度下依次实施镦锻加工和齿槽加工工序的初始热锻造工序; 以及在700〜950℃的温度下进行精加工的最终热锻工序。 (附图标记)(AA)开始; (BB)结束; (S100)锭制造工序; (S200)工作辊加热锻造步骤; (S300)热处理工序
    • 32. 发明公开
    • 인장강도 780MPa 이상의 저항복비 후육 원형 강관용 강판 및 그 제조 방법, 및 인장강도 780MPa 이상의 저항복비 후육 원형 강관
    • 对于具有780MPA或以上拉伸强度的低等效厚钢管的钢板,其制造方法和具有780MPa或更高拉伸强度的低屈服比例厚钢管
    • KR1020130027979A
    • 2013-03-18
    • KR1020120009602
    • 2012-01-31
    • 가부시키가이샤 고베 세이코쇼
    • 야마구치데츠오
    • C22C38/00C21D8/02C22C38/58B21B3/00
    • C22C38/58C21D1/28C21D8/0226C21D8/0263C22C38/001C22C38/002C22C38/02C22C38/06C22C38/50
    • PURPOSE: A steel sheet for a low yield ratio thick steel pipe with 780 MPa or greater tensile strength, a method for producing the same, and low yield ratio thick steel pipe with 780 MPa or greater tensile strength are provided to improve tensile strength by molding into a circular steel pipe through a press bending method. CONSTITUTION: A steel sheet for a low yield ratio thick steel pipe with 780 MPa or greater tensile strength contains two or more kinds among 0.02-0.15 weight% of C, 0.10-0.40 weight% of Si, 1.5-2.5 weight% of Mn, 0.012 weight% or less(not including 0%) of P, 0.005 weight% or less(not including 0%) of S, 0.005-0.02 weight% of Ti, 0.002-0.006 weight% of N, 0.02-0.08 weight% of Al, 2.5 weight% or less(not including 0%) of Ni, 2.0 weight% or less(not including 0%) of Cr, 0.5 weight% or less(not including 0%) of Mo, remaining amount of iron, and impurities. Bainite is 90 area% or greater in a micro structure which is equipped in the area of 1/4 sheet thickness. The average diameter of a circle is 4μm or less in a section which is surrounded by diagonal grain boundaries with 15° or more bearing difference in the micro structure.
    • 目的:提供具有780MPa以上拉伸强度的低屈服比厚钢管钢板及其制造方法,拉伸强度为780MPa以上的低屈服比厚钢管,以提高抗拉强度 通过压弯法成圆形钢管。 构成:具有780MPa以上拉伸强度的低屈服比厚钢管用钢板,含有0.02〜0.15重量%的C,0.10〜0.40重量%的Si,1.5〜2.5重量%的Mn, 0.012重量%以下(不包括0%)P,0.005重量%以下(不含0%)S,0.005〜0.02重量%的Ti,0.002〜0.006重量%的N,0.02〜0.08重量% Al,2.5重量%以下(不包括0%)的Ni,2.0重量%以下(不含0%)的Cr,0.5重量%以下(不含0%)的Mo,剩余量的铁和 杂质。 贝氏体在1/4厚度的区域中的微结构中为90面积%以上。 在由微观结构中具有15°或更大轴承差异的对角线晶界包围的部分中,圆的平均直径为4μm或更小。
    • 33. 发明公开
    • 열연강판 및 그 제조 방법과, 이를 이용한 강관 제조 방법
    • 热轧钢板,制造热轧钢板的方法和使用热轧钢板制造油管国家产品的方法
    • KR1020130013564A
    • 2013-02-06
    • KR1020110075275
    • 2011-07-28
    • 현대제철 주식회사
    • 정준호김성주장진영
    • C21D8/02C22C38/00C21D9/46B21B3/02
    • C21D8/0226C21D1/28C21D8/0263C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/42
    • PURPOSE: A hot-rolled steel sheet, a manufacturing method thereof, and a steel pipe manufacturing method using the same are provided to prevent decarburization by reducing the mobility of the grain boundary as carbon activity is reduced by adding more than 0.35 wt% of Cr. CONSTITUTION: A method for manufacturing a hot-rolled steel sheet is as follows. A slab plate comprises 0.17-0.23 wt% of C, 0.25-0.35 wt% of Si, 0.50-0.70 wt% of Mn, 0.35-0.45 wt% of Cr, 0.015-0.025 wt% of Ni, 0.015 wt% or less of Cu, the rest of Fe, and inevitable impurities and is reheated(S110). The reheated plate is finally hot-rolled at a FDT(Finishing Delivery Temperature) of 800-840°C(S120). The hot-rolled plate is cooled at a CT(Coiling Temperature) of 600-650°C and coiled(S130). [Reference numerals] (AA) Start; (BB) End; (S110) Slab reheating(SRT:1150-1250°C); (S120) Hot rolling(FDT:800-840°C); (S130) Cooling(CT:600-650°C)
    • 目的:提供一种热轧钢板及其制造方法以及使用该热轧钢板的钢管制造方法,通过添加大于0.35重量%的Cr来降低碳界面的流动性,从而通过降低晶界的迁移率来防止脱碳 。 构成:热轧钢板的制造方法如下。 板坯包括0.17-0.23重量%的C,0.25-0.35重量%的Si,0.50-0.70重量%的Mn,0.35-0.45重量%的Cr,0.015-0.025重量%的Ni,0.015重量%或更少的 Cu,余量的Fe和不可避免的杂质再加热(S110)。 再热板最终在800-840℃的FDT(精加工输送温度)下热轧(S120)。 热轧板在600-650℃的CT(卷取温度)下冷却并卷取(S130)。 (附图标记)(AA)开始; (BB)结束; (S110)板坯再加热(SRT:1150-1250℃); (S120)热轧(FDT:800-840℃); (S130)冷却(CT:600-650℃)
    • 35. 发明公开
    • 단조분할 커넥팅로드용 고강도 비조질강 및 그 제조 방법
    • 用于锻造单独连接杆的高强度非热处理钢和制造非热处理钢的方法
    • KR1020120011287A
    • 2012-02-07
    • KR1020100073065
    • 2010-07-28
    • 현대제철 주식회사
    • 박철우박유진손제영홍석우
    • C21D8/00C22C38/00B22D11/00B21B3/02
    • C21D8/005C21D1/28C22C38/001C22C38/02C22C38/20C22C38/38C22C38/60
    • PURPOSE: High-strength non-normalized steel for a connecting rod and a manufacturing method thereof are provided to enhance fracture by ensuring a low reduction rate in sectional area of fractured surface and low permanent strain and enhance tensile strength by omitting thermal treating processes. CONSTITUTION: A manufacturing method of high-strength non-normalized steel for a connecting rod comprises next steps. Molten metal is formed and cast. Cast steel is re-heated and pilot-rolled. The rolled steel is normalized at high temperature. The molten metal comprises one or more of C of 0.30~0.50 weight%, Si of 0.50~0.80 weight%, Mn of 1.30~1.60 weight%, P of 0.030 weight% or less, S of 0.014~0.08 weight%, Cu of 0.02~0.30 weight%, Cr of 0.10~0.50 weight%, V of 0.050~0.095 weight%, Nb of 0.02~0.05 weight%. The molten metal further comprises Fe and other inevitable impurities.
    • 目的:提供一种用于连杆的高强度非标准化钢及其制造方法,以通过确保断裂面的截面积的低的还原率和低的永久应变来提高断裂,并且通过省略热处理工艺提高拉伸强度。 构成:用于连杆的高强度非标准化钢的制造方法包括以下步骤。 熔融金属成型并铸造。 铸钢被再加热和中试。 轧制钢在高温下进行归一化。 熔融金属包含0.30〜0.50重量%的C,0.50〜0.80重量%的Si,1.30〜1.60重量%的Mn,0.030重量%以下的P,0.014〜0.08重量%的S,C为0.014〜0.08重量% 0.02〜0.30重量%,Cr为0.10〜0.50重量%,V为0.050〜0.095重量%,Nb为0.02〜0.05重量%。 熔融金属还包含Fe和其它不可避免的杂质。