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Hydrogen embrittlement inspection and control: The sensitivity to hydrogen embrittlement increases with increasing strength. For grade 10.9 Class 12.9 and male threaded fasteners or surface-hardened self-tapping screws and with a rigid steel collar Of the combination of screws and so on after plating should be carried out in addition to hydrogen treatment. De-hydrogen treatment is usually in an oven or tempering furnace, at a temperature of 190-230 degrees heat 4H, the hydrogen diffusion out .Elastic washer and circlip in each Standards have provisions for the prevention of hydrogen embrittlement technical requirements and inspection procedures. Threaded fasteners can be tightened way, in a special fixture, screwed to the screw to withstand considerable tension under the tension, keep 48H, release After the thread does not produce fracture, this method as a hydrogen embrittlement detection method
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