Ca含量对船板结构钢中夹杂物的影响  

Effect of Ca content on inclusion evolution in shipbuilding structure steel

作　　者：吴亦泉 杨健[2] 祝凯[2] 王睿之[2] 周乐君[1] 王万林[1] 

机构地区：[1]中南大学,湖南长沙410083 [2]宝山钢铁股份有限公司,上海201900

出　　处：《宝钢技术》2014年第4期1-5,共5页Baosteel Technology

摘　　要：试验研究了Ca含量对于船板结构钢中微米夹杂物的数量、尺寸以及化学组成的影响。结果表明,随着钢中Ca含量从2×10-4%增加到25×10-4%,大部分氧化物夹杂从Al2O3改性成钙铝酸盐,夹杂物中wAl/wCa从19.85降低至0.80。当Ca含量为2×10-4%时,夹杂物的面密度为40个/mm2;当Ca含量为9×10-4%以上时,夹杂物的面密度跃升为100个/mm2。同时形成了更多的以氧化物为核心,表面析出MnS的夹杂物,这有利于厚板改善大线能量焊接热影响区的冲击韧性。The effect of Ca content on the number, size and chemical composition of inclusions in shipbuilding structure steel was investigated. With the increase of Ca content in steel samples from 2 × 10-4% to 25 × 10-4% , the major oxides in inclusions change from Al2O3 to calcium aluminates, and the value of WAfWca reduces from 19.85 to 0.80. The number density of inclusions is 40/mm2 when Ca content is 2 × 10 -4% , but jumps to 100/mm2 and keeps relative stable when Ca content reach 9 ×10-4% and above. Meanwhile, more sulfides containing MnS will precipitate around the oxide. This will improve the heat affected zone toughness for the steel plate in the large- heat input welding process.

关 键 词：Ca处理 夹杂物 船板结构钢 热影响区 

分 类 号：TG142.1[一般工业技术—材料科学与工程]