The profiles are manufactured by a special extrusion process then surface hardened and given a finishing treatment.

概况生产由一个特别然后挤压工艺和表面硬化整理给予治疗。

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The paper provides the mathematical model of numerical simulation for metal surface hardened by plasma-arc with finite element method.

给出了用有限元方法对金属材料等离子体弧金属表面强化处理过程数值模拟的数学模型。

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The depths and its uniformity of the surface hardened layer, its microhardness and wear resistance are further improved under two-passes grinding.

双程磨削淬硬可使表面硬化层深度及其均匀性、显微硬度及耐磨性得到进一步提高；

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Hydraulic fracturing pumps many thousands of gallons of mainly water and sand, with a few chemicals, at high pressure into tight gas-bearing shale deposits (hardened muds), creating cracks that allow gas to flow back up the well to the surface ( Shale Shock).

FORBES: The Fracking Solution Is A Good Cement Job