|Flat welding flanges (Flange) and let Flange constructed or sudden rim. Flat welding flanges pipe and tube is connected parts, connected in pipe. Flat welding flange have holes, bolt to make the two flanges are closely linked. Flat welding between flanges with liner seal. Forging flanges quality index, forging flanges material is bad heart of its quench-hardening ability the hardness usually only more than 30 degrees, normally forging flanges often in water quenching process. Measures 0.1 containing cr � F � � 0.5 � F � � forging flanges usually do not contain chromium), carbon content in 1.0 � 4 � � under the high temperature and forging flange forging manufacturing, some forging flat surface hardness welding flanges (HRC) although can achieve 56 above quartile (quenching through layer around only 15 ㎜), for forging flat welding flanges material is bad heart of its quench-hardening ability the hardness usually only more than 30 degrees, normally forging flanges often in water quenching process. Forging flanges connection is the two pipes and pipe fittings or equipment, their first in a flat welding fixed flange plate, two flat welding between flanges, plus the flange mat, bolt together, the completion of the connection. Some pipe fittings and equipment has been bringing flange constructed, also is to belong to flange connection. Forging flanges connection is an important way of pipe construction in connection. Flat welding flanges easy to use, can withstand the big pressure. In the industrial pipe, forging flanges stamping elbow use is very extensive. In the family in, the pipe diameter is small, and is low pressure, can not see flange connection. If in a boiler room or production site, everywhere are the flange connection of pipeline and equipment.