Ferrous metals include iron and alloys of at least 50% iron, such as cast iron, wrought iron, steel, and stainless steel.

黑色金属包括铁和含有50%以上铁的合金，比如铸铁，锻铁，钢和不锈钢。

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Argon serves as a shielding gas to protect metals from oxidation during welding. Inert gas welding is the preferred method of joining several ferrous and nonferrous alloys.

焊接中，氩作为保护气防止金属氧化。惰性气体焊接是连接几种含铁和不含铁的合金的首选方法。

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In addition, the research and application of low pressure casting technology in copper alloys and ferrous metals are described emphatically.

重点叙述了低压铸造技术在铜合金及黑色金属领域的研究应用状况，并展望了低压铸造技术在未来的发展趋势。

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Information provided by Metal Pages, a news site that focuses on non-ferrous metals, ferro alloys and rare earths, indicated that rare earth elements exports have dropped 65% in 2011 and that China has only exported 11, 000 metric tons of rare earths through the first three quarters of the year.

FORBES: 2012 Outlook: Uncertainty Continues For Rare Earths Prices, China Still Major Player