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针对高强度耐腐蚀船板钢的低温冲击韧性波动范围大,低温冲击韧性低这一生产中亟待解决的问题。研究了钙处理工艺对高强度耐腐蚀船板钢低温冲击性能的影响,与传统的钙处理工艺相比,改进后的钙处理工艺能较大提高试验钢的-20℃和-40℃的低温冲击性能。当夹杂物为球形钙铝酸盐+Ca S的复合夹杂物且弥散分布时,试验钢的-20℃冲击功横向提高了24.6%,纵向提高了44.5%;-40℃冲击功横向提高了33.7%,纵向提高了32.7%。改进后的钙处理工艺,提高了钢水中[Ca]的收得率,使钙处理更充分,从而得到了低温冲击性能稳定且优良的试验钢板。
Aiming at the problems that need to be solved urgently in the production of high strength corrosion-resistant shipboard steel with low temperature impact toughness, large fluctuation range and low impact toughness at low temperature. The effects of calcium treatment on the low temperature impact properties of high strength and corrosion-resistant shipbuilding steel were studied. Compared with the traditional calcium treatment technology, the improved calcium treatment technology can greatly improve the low temperature of -20 ℃ and -40 ℃ Impact performance. When the inclusions are composite inclusions of spherical calcium aluminate + CaS dispersedly distributed, the impact energy at -20 ℃ of the test steel increases by 24.6% in the horizontal direction and 44.5% in the longitudinal direction; the impact energy at 40 ℃ increases by 33.7% in the horizontal direction %, 32.7% vertically. The improved calcium treatment process improves the yield of [Ca] in the molten steel and makes the calcium treatment more fully, thereby obtaining the test steel plate with stable and excellent low-temperature impact performance.