对减小齿轮钢的成分波动范围，保证窄淬透性的控制有重大意义。

This is very useful for decrease on composition fluctuation range of gear steel and control on narrow fluctuation hardenability.

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X70钢的CO2腐蚀受到钢的成分、显微组织等冶金因素的影响。

CO2 corrosion behavior of X70 steel is affected by metallurgy factors such as the composition and microstructure of the steel.

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影响结晶器传热的因素很多，如铸坯的拉速、钢的成分以及结晶器的结构等。

There are many factors affecting the thermal transfer in the mould, such as casting speed, composition of steel and structure of the mould.

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