hardening: hardening is a metallurgical metalworking process used to increase the hardness of a metal. the hardness of a metal is directly proportional to the uniaxial yield stress at the location of the imposed strain. a harder metal will have a higher resis
nestled in a karst landform at an average altitude of 600 meters, longchi village in changyang tujia autonomous county endured water shortages for years. zhao lihua, party chief of the village, said finding a water source for the diversion project was challenging because the village w
din 1629 seamless steel pipes application fields are: chemical plant, vessels, pipework construction and for common mechanical engineering purposes. normally din 1629 standard are manufactured with no limiting working pressure values. working temperature is limited below 300℃
china national offshore oil corp, one of the country's top three oil and gas producers, said on monday that its newly discovered bozhong 13-2 oil and gas field in the bohai sea contains proven geological reserves of 100 million metric tons of oil and gas equivalent, making it one of biggest crude
as the chinese economy has emerged from the covid-19 pandemic faster than expected, its natural gas demand is expected to set a record in 2021 with the government on track to meet its long-term environmental protection targets, according to forecasts released by several agencies.according
20# steel is a high-grade unalloyed steel used in metal structures and components operating in temperatures of -40°с to +450°с. hot-rolled and forged long products made from 20 steel conform to the dstu 7809 and gost 1050 standards.
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