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    • 5. 发明公开
    • 고경도 코발트 미량함유 고속도공구강 및 그 제조방법
    • 通过控制Co和Si的高硬度高速工具钢包含钴的跟踪及其制造方法
    • KR1020040056100A
    • 2004-06-30
    • KR1020020082644
    • 2002-12-23
    • 철강융합신기술연구조합재단법인 포항산업과학연구원주식회사 세아창원특수강주식회사 포스코
    • 정재영박재철마봉열
    • C22C38/12
    • PURPOSE: A high speed tool steel containing trace of cobalt is provided which controls hardness according to hardening temperature by controlling Co content and improves hardness by adding Si at the same time, and a method for manufacturing the same is provided. CONSTITUTION: The high hardness high speed tool steel containing trace of cobalt by controlling Co and Si contents comprises 0.75 to 1.1 wt.% of C, 0.1 to 1.0 wt.% of Si, 0.5 wt.% or less of Mn, 3.7 to 4.5 wt.% of Cr, 0.30 wt.% or less of Ni, 0.3 to 0.8 wt.% of Co, 4.5 to 5.5 wt.% of Mo, 5.5 to 6.8 wt.% of W, 1.7 to 2.2 wt.% of V, 0.6 wt.% or less of Cu and a balance of Fe and other inevitable impurities, wherein the high speed tool steel comprises 0.32 to 1.0 wt.% of Si, and wherein the high speed tool steel has 64 or more of Rockwell hardness. The method for manufacturing the high hardness high speed tool steel containing trace of cobalt by controlling Co and Si contents comprises the process of performing hot working on the homogenization treated steel slab by homogenization treating a steel slab comprising 0.75 to 1.1 wt.% of C, 0.1 to 1.0 wt.% of Si, 0.5 wt.% or less of Mn, 3.7 to 4.5 wt.% of Cr, 0.30 wt.% or less of Ni, 0.3 to 0.8 wt.% of Co, 4.5 to 5.5 wt.% of Mo, 5.5 to 6.8 wt.% of W, 1.7 to 2.2 wt.% of V, 0.6 wt.% or less of Cu and a balance of Fe and other inevitable impurities at a temperature of 1,100 to 1,150 deg.C.
    • 目的:提供含有痕量钴的高速工具钢,其通过控制Co含量来控制硬度,同时通过加入Si来提高硬度,并提供其制造方法。 构成:通过控制Co和Si含量,含有痕量钴的高硬度高速工具钢包含C:0.75〜1.1%,Si:0.1〜1.0%,Mn:0.5%(重量)以下,3.7〜4.5 Cr的重量%,Ni的0.30重量%或更少,Co的0.3至0.8重量%,Mo的4.5至5.5重量%,W的5.5至6.8重量%,V的1.7至2.2重量% ,0.6重量%以下的Cu和余量的Fe等不可避免的杂质,其中高速工具钢含有0.32〜1.0重量%的Si,其中高速工具钢的洛氏硬度为64以上。 通过控制Co和Si含量来制造含有痕量钴的高硬度高速工具钢的方法包括对均质处理的钢板进行热处理,通过均化处理含有0.75-1.1重量%的C的钢坯, 0.1〜1.0重量%的Si,0.5重量%以下的Mn,3.7〜4.5重量%的Cr,0.30重量%以下的Ni,0.3〜0.8重量%的Co,4.5〜5.5重量% 温度为1100〜1150℃,Mo为5.5〜6.8重量%,V为1.7〜2.2重量%,Cu为0.6重量%以下,余量由Fe和其他不可避免的杂质构成。
    • 7. 发明公开
    • 페라이트-오스테나이트 2상조직을 갖는 스테인레스강주조재의 열간단조 방법
    • 具有铁素体相的两相不锈钢铸造的热锻方法
    • KR1020070075428A
    • 2007-07-18
    • KR1020070066234
    • 2007-07-02
    • 철강융합신기술연구조합주식회사 포스코재단법인 포항산업과학연구원주식회사 세아창원특수강
    • 정재영마봉열
    • B21J5/00C22C38/00B21J9/00B21J1/00
    • C22C38/44B21J9/00C22C38/001C22C38/02C22C38/04
    • A hot forging method of stainless steel casting having ferrite-austenite dual phase structure is provided to improve hot workability of a 2507 grade duplex stainless steel by setting up an optimal hot working area and deriving an area that enables stable working to be performed. A hot forging method of a stainless steel casting having ferrite-austenite dual phase structure comprises: heating a stainless steel casting having ferrite-austenite dual phase structure comprising, by weight percent, 0.03% or less of C, 0.8% or less of Si, 1.2% or less of Mn, 6.0 to 8.0% of Ni, 24.0 to 26.0% of Cr, 3.0 to 5.0% of Mo, 0.24 to 0.32% of N, and the balance of Fe and other inevitable impurities to a temperature of 1200 to 1250 deg.C; performing hot forging press of the heated stainless steel casting at a forming rate of 3 s^-1 or less until the stainless steel casting is cooled to 1150 deg.C; performing hot forging press of the stainless steel casting at a forming rate of 2 s^-1 or less until the stainless steel casting is cooled to 1100 deg.C; and performing hot forging press of the stainless steel casting at a forming rate of 1 s^-1 or less until the stainless steel casting is cooled to 1050 deg.C.
    • 提供具有铁素体 - 奥氏体双相结构的不锈钢铸造的热锻造方法,通过设置最佳热加工面积和导出能够进行稳定工作的区域来提高2507级双相不锈钢的热加工性能。 具有铁素体 - 奥氏体双相结构的不锈钢铸件的热锻方法包括:对具有铁素体 - 奥氏体双相结构的不锈钢铸件进行加热,所述不锈钢铸件的重量百分比为0.03%以下,C:0.8%以下,Si: 1.2%以下的Mn,6.0〜8.0%的Ni,24.0〜26.0%的Cr,3.0〜5.0%的Mo,0.24〜0.32%的N,余量为Fe等不可避免的杂质,温度为1200〜 1250℃; 以3s ^ -1以下的形成速度进行加热不锈钢铸件的热锻压制,直到不锈钢铸件冷却至1150℃; 以2s ^ -1以下的形成速度进行不锈钢铸件的热锻压制,直到不锈钢铸件冷却至1100℃; 并以1s ^ -1以下的形成速度进行不锈钢铸件的热锻压制,直到不锈钢铸件冷却至1050℃。