公开(公告)号：KR1020040056100A

公开(公告)日：2004-06-30

申请号：KR1020020082644

申请日：2002-12-23

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원 ,  주식회사 세아창원특수강 ,  주식회사 포스코

Inventor： 정재영 ,  박재철 ,  마봉열

IPC: C22C38/12

Abstract: 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.

Abstract translation: 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。

公开(公告)号：KR1020020076723A

公开(公告)日：2002-10-11

申请号：KR1020010016812

申请日：2001-03-30

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원

Inventor： 정재영 ,  마봉열

IPC: C22C38/12

Abstract: PURPOSE: To manufacture Co-free high speed steel having superior hardness by modifying Si and Cu content with no addition of Co or rare earth metals. CONSTITUTION: The Co-free high speed steel having superior hardness is manufactured by soaking an alloy cast comprising C 0.75 to 1.1 wt.%, Si 0.32 to 1.0 wt.%, Mn 0.5 wt.% or less, Cr 3.7 to 4.5 wt.%, Ni 0.30 wt.% or less, Mo 4.5 to 5.5 wt.%, W 5.5 to 6.8 wt.%, V 1.7 to 2.2 wt.%, Cu 0.6 wt.% or less, a balance of Fe and other inevitable impurities at 1100 to 1150 deg.C, wherein Si is 0.5 to 1.0 wt.% and Cu is less than 0.3 wt.%.

Abstract translation: 目的：通过不添加Co或稀土金属，通过改变Si和Cu含量来制造具有优异硬度的无钴高速钢。 构成：具有优异硬度的无Co高速钢通过将包含C 0.75〜1.1重量％，Si 0.32〜1.0重量％，Mn 0.5重量％以下，Cr 3.7〜4.5重量％的合金铸件， ％，Ni 0.30重量％以下，Mo 4.5〜5.5重量％，W 5.5〜6.8重量％，V 1.7〜2.2重量％，Cu：0.6重量％以下，余量为Fe和其他不可避免的杂质 在1100〜1150℃，Si为0.5〜1.0重量％，Cu为0.3重量％以下。

公开(公告)号：KR1019990052000A

公开(公告)日：1999-07-05

申请号：KR1019970071441

申请日：1997-12-20

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원

Inventor： 백응률 ,  마봉열 ,  정재영

IPC: B23K35/362

Abstract: 본 발명은 경화육성용 용접와이어에 관한 것이며; 그 목적은 스패트 발생량이 적고, 용착금속의 비드형상이 건전하게 형성될 수 있는 경화육성용 용접와이어를 제공함에 있다.
상기 목적을 달성하기 위한 본 발명은 플럭스가 30-60중량%이고, 나머지 튜브라형 외피로 구성되는 육성용접 와이어에 있어서, 상기 플럭스중 95중량%이상이 와이어 총중량에 대하여 C:2-6중량%, Cr:10-35중량%, Mn:0.5-4중량%, Si:0.2-4중량% 및 나머지 Fe로 이루어지는 금속분말이고; 상기 플럭스중의 나머지 5중량%이하가 와이어의 총중량에 대하여 Al:3중량%이하, CaF
2 :3중량%이하, Ti또는 Fe-Ti중 선택된 1종:0.3-2.0중량%로 이루어지는 혼합분말로 구성되는 고효율 크롬탄화물형 경화육성용 용접와이어에 관한 것을 그 요지로 한다.

公开(公告)号：KR100431830B1

公开(公告)日：2004-05-17

申请号：KR1020010018798

申请日：2001-04-09

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원

Inventor： 정재영 ,  이대수 ,  마봉열

IPC: C22C38/42

Abstract: PURPOSE: A free machining austenitic stainless steel having superior hot workability is provided, which is manufactured by controlling the amount of delta-ferrite in austenitic stainless steel with no addition of alloying element such as B. CONSTITUTION: The free machining austenitic stainless steel comprises C 0.15 wt.% or less, Si 1.0 wt.% or less, Mn 1.0 to 3.5 wt.%, S 0.15 to 0.40 wt.%, Cr 16 to 19 wt.%, Ni 8 to 14 wt.%, Mo 2.5 wt.% or less, Cu 4 wt.% or less, N 0.08 wt.% or less, a balance of Fe and other unavoidable impurities, wherein the portion of delta-ferrite in the free machining austenitic stainless steel is less than 6 wt.%, Mn/S is higher than 6 and the oxygen portion in the free machining austenitic stainless steel is 0.007 to 0.11 wt.%.

Abstract translation: 目的：提供一种具有优良热加工性的易切削奥氏体不锈钢，其通过控制奥氏体不锈钢中的δ铁素体的量而不添加合金元素如B来制造。组成：所述易切削奥氏体不锈钢包含C 0.15重量％或更少，Si 1.0重量％或更少，Mn 1.0-3.5重量％，S 0.15-0.40重量％，Cr 16-19重量％，Ni 8-14重量％，Mo 2.5重量％ 以下，Cu：4重量％以下，N：0.08重量％以下，余量由Fe和其他不可避免的杂质构成，其中，所述易切削奥氏体系不锈钢中的δ铁素体的含量小于6重量％ ％，Mn / S高于6，并且所述易切削奥氏体不锈钢中的氧含量为0.007-0.11重量％。

公开(公告)号：KR100756394B1

公开(公告)日：2007-09-10

申请号：KR1020070066234

申请日：2007-07-02

Applicant: 철강융합신기술연구조합 ,  주식회사 포스코 ,  재단법인 포항산업과학연구원 ,  주식회사 세아창원특수강

Inventor： 정재영 ,  마봉열

IPC: B21J5/00 ,  C22C38/00 ,  B21J9/00 ,  B21J1/00

Abstract: 본 발명은 선박, 석유화학 그리고 발전설비 등 높은 내식성을 요구하는 부품에 이용되는 2507급 슈퍼 듀플렉스 스테인레스강의 열간단조 방법에 관한 것이다.
본 발명은, 중량%로, C: 0.03% 이하, Si: 0.8% 이하, Mn: 1.2% 이하, Ni: 6.0~8.0%, Cr: 24.0~26.0%, Mo: 3.0~5.0%, N: 0.24~0.32%, 나머지 Fe 및 기타 불가피한 불순물로 조성되는 페라이트-오스테나이트 이상조직을 갖는 스테인레스강 주조재를 1200~1250℃로 가열한 후에 1150℃로 냉각될때 까지는 3s
-1 이하의 성형속도로 열간단조 프레스하고, 1100℃로 냉각될때 까지는 2s
-1 이하의 성형속도로 열간단조 프레스하며, 1050℃로 냉각될때 까지는 1s
-1 이하의 성형속도로 열간단조 프레스하는 것을 특징으로 한다.
본 발명에 따르면 난가공성의 2507급 슈퍼 듀플렉스 스테인레스강 주조재를 효율적으로 프레싱함으로써 열간단조시에 성형결함을 최소화할 수 있을 뿐만 아니라 우수한 미세조직을 갖는 성형부품을 제조할 수 있다.
듀플렉스, 스테인레스강, 열간단조, 성형속도, 가공온도

公开(公告)号：KR1020070075428A

公开(公告)日：2007-07-18

申请号：KR1020070066234

申请日：2007-07-02

Applicant: 철강융합신기술연구조합 ,  주식회사 포스코 ,  재단법인 포항산업과학연구원 ,  주식회사 세아창원특수강

Inventor： 정재영 ,  마봉열

IPC: B21J5/00 ,  C22C38/00 ,  B21J9/00 ,  B21J1/00

CPC classification number: C22C38/44 ,  B21J9/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04

Abstract: 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.

Abstract translation: 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℃。

公开(公告)号：KR100406428B1

公开(公告)日：2003-11-19

申请号：KR1020010016812

申请日：2001-03-30

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원

Inventor： 정재영 ,  마봉열

IPC: C22C38/12

Abstract: PURPOSE: To manufacture Co-free high speed steel having superior hardness by modifying Si and Cu content with no addition of Co or rare earth metals. CONSTITUTION: The Co-free high speed steel having superior hardness is manufactured by soaking an alloy cast comprising C 0.75 to 1.1 wt.%, Si 0.32 to 1.0 wt.%, Mn 0.5 wt.% or less, Cr 3.7 to 4.5 wt.%, Ni 0.30 wt.% or less, Mo 4.5 to 5.5 wt.%, W 5.5 to 6.8 wt.%, V 1.7 to 2.2 wt.%, Cu 0.6 wt.% or less, a balance of Fe and other inevitable impurities at 1100 to 1150 deg.C, wherein Si is 0.5 to 1.0 wt.% and Cu is less than 0.3 wt.%.

Abstract translation: 目的：通过改变Si和Cu含量而不添加Co或稀土金属来制造具有优异硬度的无Co高速钢。 本发明提供一种具有优异硬度的无钴高速钢，其特征在于，将含有C：0.75〜1.1重量％，Si0.32〜1.0重量％，Mn0.5重量％以下，Cr3.7〜4.5重量％ ％，Ni 0.30重量％或更少，Mo 4.5-5.5重量％，W 5.5-6.8重量％，V 1.7-2.2重量％，Cu 0.6重量％或更少，其余为Fe和其它不可避免的杂质 在1100-1150℃，其中Si为0.5-1.0重量％，Cu小于0.3重量％。

公开(公告)号：KR1020020087750A

公开(公告)日：2002-11-23

申请号：KR1020010026744

申请日：2001-05-16

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원

Inventor： 정재영 ,  이대수 ,  마봉열

IPC: C21D8/00

Abstract: PURPOSE: Provided is a method for improving hot workability of free machining austenitic stainless steel by controlling the shape of delta-ferrite in soaking process with no addition of B. CONSTITUTION: In the heat treatment method of free machining austenitic stainless steel that includes the step of soaking a steel comprising C 0.15 wt.% or less, Si 1.0 wt.% or less, Mn 1.0-3.5 wt.%, S 0.1-0.4 wt.%, Cr 16-19 wt.%, Ni 8-14 wt.%, Mo 2.5 wt.% or less, Cu 4 wt.% or less, N 0.08 wt.% or less, unavoidable impurities and a balance of Fe at 1220 to 1260 deg.C, the method is characterized in that the average ratio of major axis and minor axis of delta-ferrite is within the range of 1.0 to 2.5 and its size is 5 to 35 mm; Mn/S is higher than 4; and oxygen content in the free machining austenitic stainless steel is 0.007 to 0.011 %.

Abstract translation: 目的：提供通过在不添加B的情况下通过在均热处理中控制δ-铁素体的形状来改善自由加工奥氏体不锈钢的热加工性的方法。构成：在自由加工奥氏体不锈钢的热处理方法中，包括步骤 浸渍钢，其包含C 0.15重量％以下，Si 1.0重量％以下，Mn 1.0-3.5重量％，S 0.1-0.4重量％，Cr 16-19重量％，Ni 8-14重量％ ％，Mo 2.5重量％以下，Cu 4重量％以下，N 0.08重量％以下，不可避免的杂质，余量为1220〜1260℃的Fe，该方法的特征在于平均 δ-铁素体的长轴和短轴的比例在1.0至2.5的范围内，其尺寸为5至35mm; Mn / S高于4; 自由加工奥氏体不锈钢中的氧含量为0.007〜0.011％。

公开(公告)号：KR1020080057590A

公开(公告)日：2008-06-25

申请号：KR1020060131070

申请日：2006-12-20

Applicant: 주식회사 포스코 ,  재단법인 포항산업과학연구원 ,  철강융합신기술연구조합 ,  주식회사 세아창원특수강

Inventor： 마봉열 ,  정재영

IPC: C22C38/08

CPC classification number: C22C38/44 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/50 ,  C22C2202/00

Abstract: Ca containing high Ni content duplex stainless steel is provided to improve hot workability increase by adding Ca and Ti to an alloy. Ca containing high Ni content duplex stainless steel is obtained by adding 0.001 to 0.01% of Ca to an alloy consisting of, by a weight ratio, C: less than 0.03%, Si: less than 1.0%, Mn: less than 2.0%, Ni:7.5 to 9.5%, Cr:21.5 to 23.5%, Mo:2.5 to 3.5%, N:0.12 to 0.20%, and the remainder Fe and unavoidable impurities. The alloy is added with less than 0.1% of Ti.

Abstract translation: 提供含有高Ni含量双相不锈钢的Ca，以通过向合金中添加Ca和Ti来改善热加工性增加。 通过向合金中添加0.001〜0.01％的Ca，以重量比C：小于0.03％，Si：小于1.0％，Mn：小于2.0％的合金，得到含有高Ni含量双相不锈钢的Ca， Ni：7.5〜9.5％，Cr：21.5〜23.5％，Mo：2.5〜3.5％，N：0.12〜0.20％，余量为Fe和不可避免的杂质。 该合金加入少于0.1％的Ti。

公开(公告)号：KR100502193B1

公开(公告)日：2005-07-20

申请号：KR1020020082644

申请日：2002-12-23

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원 ,  주식회사 세아창원특수강 ,  주식회사 포스코

Inventor： 정재영 ,  박재철 ,  마봉열

IPC: C22C38/12

Abstract: 본 발명은 절삭기계의 공구로 사용되는 고속도공구강 및 그 제조방법에 관한 것이다.
이 고속도공구강은 중량%로, C: 0.75~1.1%, Si: 0.1~1.0%, Mn: 0.5% 이하, Cr: 3.7~4.5%, Ni: 0.30% 이하, Co: 0.3~0.8%, Mo: 4.5~5.5%, W: 5.5~6.8%, V: 1.7~2.2%, Cu: 0.6% 이하, 나머지 Fe및 기타 불가피한 불순물로 조성된다. 또한, 이 고속도공구강의 제조방법 역시 제공된다.
이 고속도공구강은 M2 고속도공구강의 열간가공성을 가지면서 목표 경도치를 갖는다. 따라서, 선재 및 봉재의 생산이 용이하며, M2 고속도공구강의 품질이 향상된다.