渗氮时间愈长，试样的氮化量愈多。
The longer nitriding time, the more amount nitrogen pick-ups.
研究了减温阀门气体渗氮工艺，分析了渗氮温度、渗氮时间对其力学性能的影响。
The technology of gas-nitration of the reducing-temperature valve was studied. The effects of nitration temperature and time on the mechanical properties were analysed.
结果表明，固态渗氮过程中钢中氮的平均质量分数与渗氮时间的平方根成正比，渗氮反应速率受钢的化学成分影响；
When the temperature was higher than 1373 K, the dissolved nitrogen would release and the rate of nitrogen release was influenced by chemical composition of those steels.
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