外套材质有：钢质（非UL认证），304 和316不锈钢，钛钢，锆钢，铌钢和钽钢。

Sheath materials available are: steel(not UL listed), 304 & 316 stainless, titanium, zirconium, niobium and tantalum.

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锆的强度几乎与钢一样。

Zirconium is almost as strong as steel.

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锆合金与不锈钢的连接在核反应堆工程中是一项重要技术，目前还没有找到一种令人十分满意的方法。

The bonding of zircaloy and stainless steel is an important technology in project of nuclear reactor and it has not been solved completely as yet.

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