摘要:
利用真空反应釜冶炼Cr12N高氮钢,在冶炼过程中通过改变冶炼温度、压力、底吹时间、底吹气量等条件,研究Cr12N高氮钢中氮含量。试验结果表明:当温度从1 560℃上升到1 620℃时,Cr12N高氮钢中N含量从0.37%迅速下降至0.34%;压力从1.1 MPa升至1.6 MPa时,钢水中的N含量从0.31%增加到0.39%,涨幅达25.8%。由于压力较高,钢液中的N含量与氮分压之间呈非线性关系,与Sievert定律存在一定的偏离;底吹时间在5~15 min范围内时,Cr12N高氮钢中N含量随着底吹时间的增加而增加,当底吹时间大于15 min时,Cr12N高氮钢中N含量趋于饱和;底吹流量在0.16~0.18 m3/h范围内,随着底吹流量的增加,Cr12N高氮钢中N含量呈显著上升的趋势,当底吹量达到0.18 m3/h时钢中N含量达到最大值,此后随底吹量的增大,钢中N含量开始降低。
Abstract:
By varying temperature,pressure,bottom blowing time and bottom blowing flux during vacuum smelting Cr12N steel for the purpose of determinating factors influencing N content in a Cr12N high nitrogen steel.The results indicated that N content decreased from 0.37% to 0.34% when the tested temperature increased from 1 560℃ to 1 620℃,The N content in Cr12N high nitrogen steel increased from 0.31% to 0.39% with pressure raising from 1.1 MPa to 1.6 MPa.Due to higher pressure the relationship between N content and pressure was nonlinear,which did not comply with Sievert law.N content increased with bottom blowing time extending at 5~15 minutes and remained constant after blowing for more than 15 minutes.Increasing bottom blowing flux at 0.16~0.18 m3/h would increase N content,while bottom blowing flux exceeded 0.18 m3/h.further increasing blowing flux led to reduction in N content.
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