The article discusses and finds the Auster grain growing rules and relations of structure and properties of X70 steel in weld pipe and pipeaccessories under the different heating temperature.
Be responsible for maintaining gas pipe, valve and other accessories.
负责煤气主管道、阀门及辅件的维修保养。
3
The single well flow metering unit, which is made up of oil meter, recorder, accessories such as pipe and valve and so on, was developed for the oil measurement of single well in series oil Wells.