High-frequency welded pipe is divid資理ed into the following four kinds,人請 the definition, function and standard code 身音are as follows:
      &nb嗎從sp;1.bai welded steel pipe for low pressure少可 fluid transmission (GB/T3092-1993來務), also known as general w新校elded pipe, commonly kn店上own as black pipe. Is used to 些飛transport water, gas技好, air, oil and heating steam and other gene有上ral lower pressure fluid and other uses下冷 of welded steel pipe. The wall thic笑討kness of steel pipe is divided志街 into ordinary steel 慢南pipe and thickened steel pipe; the form新她 of the receiver end is divided電工 into unthreaded steel pipe (light 道黃pipe) and threaded steel pipe刀畫. Steel pipe specific照務ations with nominal calibre (mm), nominal calibre事票 is an approximation of the inner店器 diameter. Customarily, commonly us厭雪ed in inches, such a廠日s 11/2, etc. Low-pressure fluid transport with w得業elded steel pipe in addition to dire長水ct use for the transport of fluids, but also a畫作 large number of low-pressure fluid近飛 transport with galvanized welded steel pipe for 文現the original tube.
　　

     說弟;2. Galvanized welded steel pipe f醫長or low pressure fluid transfer計線 (GB/T3091-1993), also known as galva見著nized electric welded s資業teel pipe, commonly known as w答生hite pipe. Is used to transport water做亮, gas, air oil and heating steam, warm wate對身r and other general lowe視西r pressure fluid or other uses of 化劇hot dipped galvanized welded (furn快現ace welding or electric welding) steel pipe. 讀讀The wall thickness of th呢土e steel pipe is divided into ordinary galvaniz美農ed steel pipe and thickened g能匠alvanized steel pipe; the form of the receive快白r is divided into galvanized st討但eel pipe without thread and galvanize見線d steel pipe with threa妹腦d. The specification of the steel 算工pipe is expressed in nominal calibre (mm), an低筆d the nominal calibre is an approxima雨照tion of the internal diameter. Customarily co為謝mmonly used in inches, such 些錢as 11/2, etc.
　 

     3. O又年rdinary carbon steel wire casi湖司ng (GB3640-88) is used for the protection 我用of steel pipes in industrial and紅但 civil buildings, installation of machinery and 坐湖equipment and other electrica時件l installation projects.
　 

   &nb街南sp; 4. Straight seam welded steel pip生藍e (YB242-63) is a st是高eel pipe with welded s友能eams parallel to the longitudinal 廠河direction of the pip照影e. Usually divided into metric electric wel愛中ded steel pipe, electric welded thin-國輛walled pipe, transformer cooling oil pipe and校音 so on.