Al、Ti、Nb微合金化对ZF7渗碳钢晶粒混晶的影响  

Effect of Al,Ti,Nb Microalloying on Mixed Grain Size of Case-Hardened Steel ZF7

作　　者：李绍杰[1] 樊一丁[1] 黄胜永[1,2] 

机构地区：[1]石家庄钢铁有限责任公司开发部,石家庄050031 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《特殊钢》2013年第2期52-54,共3页Special Steel

摘　　要：研究了(/%)0.023Al_(sol)、0.035Al_(sol)、0.018～0.019Al_(sol)-0.012～0.014Ti和0.019～0.020Al_(sol)-0.031～0.032Nb微合金化对60 t BOF-LF-VD-300 mm×360 mm CC-连轧工艺生产的Φ120 mm ZF7渗碳钢(/%:0.18～0.20C、0.22～0.25Si、1.22～1.30Mn、0.008～0.016P、0.019～0.029S、1.19～1.25Cr、0.001 8～0.002 2B)930℃加热时晶粒度混晶的影响。结果表明,在930℃7.5 h热处理条件下,当Al_(sol)为0.035%时ZF7钢未发生混晶现象,当钢中(/%)0.023Al_(sol)或0.018～0.019Al_(sol)-0.012～0.014Ti或0.019～0.020Al_(sol)-0.031～0.032Nb微合金化时,ZF7钢均发生了混晶现象,说明钢中有足够的Al_(sol)含量是防止ZF7钢发生混晶的关键因素。Effect of （/% ：） 0. 023Alsol, 0.035Alsol, 0.018 -0.019Alsol-0.012 -0.014Ti and 0.019 -0. 020Alsol- 0. 031 -0. 032Nb microalloying on mixed grain size of （I）120 mm case hardened steel ZF7 （% ： 0. 18 -0. 20C, 0. 22 0.25Si, 1.22-1.30Mn, 0.008-0.016P, 0.019-0.029S, 1.19 -1.25Cr, 0.0018-0.0022B） produced by 60 t BOF-LF-VD-300 mm x 360 mm CC-continuous rolling process and heated at 930 ℃ has been studied. Results show that with heat treatment condition at 930 ℃ for 7.5 h, as Alsol content in steel is 0. 035% , there is no mixed grain size occurred in steel ZF7, but in steel ZF7 microalloying with （/% ： ） 0. 023Alsol, 0. 018 - 0. 019Alsol- 0. 012 - 0. 014Ti or 0. 019 - 0. 020Alsol-0. 031 -0. 032Nb the phenomena of mixed grain size occurs in steel, it is indicated that the steel has sufficient Alsol content is key factor to avoid mixed grain size occurring in steel ZFT.

关 键 词：ZF7渗碳钢 Alsol、Ti、Nb 微合金化 混晶 

分 类 号：TG142.3[一般工业技术—材料科学与工程]