Production steel grade: carbon structure steel, low alloy high intensity structure steel, steel for bridge, weathering steel, etc.

生产钢种：碳素结构钢、低合金高强度结构钢、桥梁用钢、耐候钢等。

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Some of the steel in the tower was supplied by the same steel factory that made the steel for the Brooklyn Bridge.

钢塔上有些钢是由为布鲁克林大桥造钢的那一家钢铁厂提供的。

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As for whether the concrete and steel bridge towers needed to be 300 meters-breaking yet another record-sometimes the most responsible engineers can get a little carried away.

至于混凝土和钢制的桥塔都要超过300米——这又打破了一项记录——有时候最可靠的工程师也会感到有点头晕目眩。

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Dorgan also cited an in-depth study of the bridge's fatigue potential conducted from 2004 to 2007 that recommended two alternatives for the bridge's future -- to add steel plates to reinforce critical parts of the bridge or to conduct thorough inspections of the wells inside the box to determine whether there were cracks.

CNN: Bridge collapse probe focuses on unexplained shift

How smart is Dagny and Ellis for not testing the steel themselves but they bravely ride a high speed train over a bridge made of it?

FORBES: Atlas Shrugged: Ten Lessons From Dagny Taggart