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Abstract：
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In order to increase the service life of the D2 die steel rolled section for cold working, a series of experiments and investigations are finished according to that as far as the chemical composition is concerned , the way of increasing Re is adopted; For the finished heat treatment, we adopt normal experiment to seek optimum technology and select four quenching temperature points ,four tempering temperature points and two tempering times as well as four tempering time; Afterwards we make the consideration of whether we will increase Re or not and finally ,we choose out the optimum heat treatment technology by a lot of trial comparisons. Compared with the material under the former technology condition, we find that the material properties are greatly improved on the wearability , impact toughness and so that the purpose to increase the service life of D2 dies has been realized.
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AuthorIntro：
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Reference：
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[1] 孙珍宝.合金钢手册[M].北京:冶金工业出版社,1984.
[2] 余宗森.稀土在钢铁中的应用[M].北京:冶金工业出版社,1987.
[3] 李慧.钢铁冶金概论[M].北京:冶金工业出版社,1993.
[4] 中国科学院数学研究所统计组.常用数理统计方法[M].北京:科学出版社,1979.
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