【摘要】 测试了3X-52钢连铸坯试洋的高温延性。变形试样中主要有三类碳、氮化物析出:高温下析出的块状粗大 TiN 析出物;950～900℃沿晶界和在晶粒基体内部析出的微细动态析出产物;依附在 TiN 颗粒上生成的复合析出物。与不含钛的含铌钢相比,X-52钢试样在850℃～Ar₃温度之间没有出现进一步的延性降低,γ→P转变温度的提高,减轻了其在第Ⅲ脆性温度区的脆性程度。更多还原

【Abstract】 Hot ductility of the X-52 line-pipe steel CC slab was measured.Three types of precipitates were found in the fractured specimens.One is the block-shaped coarse TiN particles precipitated at high temperature.Another is fine dynamic precipitation products precipitated at 950～900℃.The third type is the coexisted precipitates formed by fine Nb precipitates nucleating and growing on TiN particles.Comparing with Nb-containing steel which contains no Ti,there is no ductility drop for X-52 steel at temperature between 850 ℃ and Ar₃,and its transfer temperature from γ to P is higher,thus ductility of the steel is improved in the low ductility temperature region Ⅲ.更多还原