P91耐热钢探伤分层缺陷成因及改进

炼钢 ›› 2017, Vol. 33 ›› Issue (2): 69-.

P91耐热钢探伤分层缺陷成因及改进

（大冶特殊钢股份有限公司，湖北黄石 435001）

接受日期:1900-01-01 出版日期:2017-04-05

The causes and improvement measures of delaminate defects on P91 heat-resistant steel

Accepted:1900-01-01 Online:2017-04-05

摘要/Abstract

摘要： 为了进一步提高P91钢产品质量，采用扫描电镜、ASPEX等检测方法对P91钢探伤分层形成原因进行了分析。结果表明：炼钢工序形成的镁铝尖晶石、铝酸钙等非金属夹杂物残留在钢中，在加工过程夹杂物聚集处应力集中产生裂缝和分层。夹杂物级别和T.O含量这2项指标较差，反映出P91钢在控制钢液洁净度方面存在问题。通过优化精炼渣组成（w（CaO）=55 %~60 %、w（SiO₂）=10 %~15 %、w（Al₂O₃）=18 %~23 %）、应用氮气增氮工艺以及提高高品质镁碳砖抗侵蚀能力等措施，试制10炉P91钢夹杂物级别稳定控制在1级以下，w（T.O）均值由21.04×10^-6降低到16.73×10^-6，探伤分层机率降低，钢管成材率提高15 %。

关键词: P91钢, 分层缺陷, 洁净度, 精炼渣, 增氮工艺, 镁碳砖

Abstract: In order to improve the quality of P91 steel products, causes of delaminate defects on P91 steel were analyzed by scanning electron microscopy (SEM) and ASPEX. The results showed that magnesiaalumina spinel and calcium aluminate of steelmaking process led to stress concentration in the machining process. Inclusion gathering place was easy to form crack and delamination. The low index of inclusion level and total oxygen content reflected problems upon steel cleanliness. By means of optimizing refining slag composition (w（CaO）=55 %－60 %，w（SiO₂）=10 %－15 %，w（Al₂O₃）=18 %－23 %), using nitriding technology and high quality magnesia carbon brick to improve anti-erosion on 10 furnaces trial-manufacture, the inclusion level was stably controlled below 1.0 grade and w（T.O） was reduced from 21.04×10^-6 to 16.73×10^-6. The delaminate defects reduced and the steel tube product yield increased by 15 %.

Key words: P91 steel, delaminate defects, cleanliness, refining slag, nitriding technology, magnesia carbon brick

杨进玲，周立新，潘明旭，余亚平，郭畅，张洲，吕文俊. P91耐热钢探伤分层缺陷成因及改进[J]. 炼钢, 2017, 33(2): 69-.

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