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    • 66. 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℃。