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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(SiO_2)=10%~15%、w(Al_2O_3)=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%。
In order to further improve the quality of P91 steel products, the formation of flaw detection of P91 steel was analyzed by SEM, ASPEX and other testing methods. The results show that the nonmetallic inclusions, such as magnesia - alumina spinel and calcium aluminate, formed in the steel - making process remain in the steel, resulting in the stress concentration in the inclusions in the process, resulting in cracks and delamination. Inclusion levels and T.O content of these two indicators of poor, reflecting the P91 steel in the control of steel cleanliness problems. By optimizing the composition of refined slag (w (CaO) = 55% ~ 60%, w (SiO_2) = 10% ~ 15% and w (Al_2O_3) = 18% ~ 23% Carbon brick anti-erosion ability and other measures, trial 10 furnace P91 steel level stability control in 1 below, w (TO) means from 21.04 × 10 -6 to 16.73 × 10 -6, Layers reduce the probability of success rate of steel pipe increased by 15%.