To make steel the old-fashioned way, you blast iron ore with heat and purify the resulting molten metal with oxygen.

旧的炼钢方式是加热铁矿石使其燃烧，然后用氧气净化溶化的铁水。

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Electric welding is used to repair iron and steel parts of machinery, and to make steel pipe and frameworks of all kinds.

电焊可用于修理机器的铁制和钢制部件，还可以用于制作各种各样的钢管和其它钢结构部件。

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Coal is still Australia's main minerals export, and Queensland produces about a third of the world's coking variety, the kind used to make steel.

煤依然是澳大利亚矿产中最主要的出口品种，昆士兰出产约占全世界三分之一量的各类炼钢用焦炭产品。

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The development of steel building technology also helped make taller buildings possible.

VOA: special.2010.03.31

I could even make it out of steel versus aluminum.

甚至可以用刚合铝来做。

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This new, condensed energy allowed them to make steel and build ships and factories.

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The privately held company produces a coal-based additive called coke that is used to make steel.

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It is already largely dependent on imports of coking coal, used to make steel.

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