In the early days of the Second World War, the British Royal Air Force Spitpie fighter plane crashed because of the engine spindle fracture, the aircraft destroyed the death, this incident shocked the British opposition. A 1975 U.S. refinery in Chicago, a 15cm stainless steel tube burst suddenly, causing explosions and fires, resulting in long-term production. A one-month-old fire broke out in France as the pipe burst as it exploited the Clark gas field. China in the development of a large oil field, also because of pipeline rupture has been blowout, heavy losses. The military also: the United States "Polaris" missile due to the collapse of solid fuel engine shell can not launch, the U.S. Air Force F-11 fighter aircraft crashed in the air suddenly. On the way of the car because the shaft suddenly broke and overturned, is cutting tools on the machine suddenly broken and other accidents. These catastrophic and vicious accidents, instantaneous occurrence, without any indication beforehand, break without discussion, seriously threaten people to produce property safety. At first, the scientists had a very divergent views on the cause of the accident. Later, after a long period of observation and research, finally proved this series of vicious accident culprit-hydrogen embrittlement.
Direct conclusion: The production of alloy steel as raw materials 10.9, 12.9, 14.9-class high-strength bolts after electroplating (or only after pickling), must be in the first time to remove hydrogen embrittlement treatment, except the hydrogen embrittlement treatment method is: 200 degrees oven heating 3-4 hours hydrogen atom.
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