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hard faced adj.面貌嚴厲的,其貌不揚的。

hard facing

Mechanical equipment of nuclear reactors : design and construction rules . hard facing by cobalt alloys melting for mechanical equipment of nuclear reactors 原子反應堆機械設備.設計與制造規則.原子反應堆機械設備用鈷合金固熔法表面硬化

Non - lubricated , tapered plug assures tight seal with low breakout torque . constructed of hardened materials with optional hard facing 無潤滑,錐形閥塞確保緊密密封,并且具有很低的啟動扭矩。有硬化材料構造而成,配置備選硬面。

Hardened seating surfaces ? both disc and body seating surfaces are hard faced for maximum service life 硬化的閥座表面?閥瓣和閥體地閥座表面都經過表面硬化,最大限度延長使用壽命。

Hard facing is weld deposited cobalt base alloy 硬面焊接鈷基合金沉淀物。

Most of them had hard faces . 他們的臉多半是鐵板的。