Effects of [S] and T[O] on strength and toughness of high purification low alloy steel plates

Zengwu Zhao, Xinhua Wang, and Guowei Chang1)Metallurgical Engineering School. University of Science and Technology Beijing, Beijing 100083, China2)Baotou University of Iron and Steel Technology, Baotou 014010, China

摘 要：<正> The effect of [S] on strength and toughness of low alloy steel plates in which sum of [P], [N], T[O] is less than 8x10 5 and the effect of T[O] on strength and toughness of the steel plates in which sum of [S], [P], [N] is less than 7x10⁵ were investigated. It is found that the strength of the steel plates decreases with increasing [S] content when [S] is less than 4x10⁵. When [S] varies within the range of 4×10^-5-1.2×10^-4, [S] has no significant effect on strength of the steel. The strength of the steel plates increases with increasing T[O] content when T[O] is less than 30×10^-6, but decreases with increasing T[O] when T[O] is more than 3×10^-5. The difference between the LETT in plate length direction and LETT in width direction decreases with decreasing [S] content. However, even when [S] is decreased to 9×10^-6, the difference of the LETT is still 16℃. When T[O] varies between 1.8×10^-5 and 5.2×10^-5, the low temperature impact toughness of the steel plates slowly decrease

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