Plate type flat welding flange (chemical standard hg20592, national standard GB / t9119, mechanical JB / T81): it is easy to obtain materials, simple to manufacture, low cost and widely used; however, due to its poor rigidity, it shall not be used in chemical process piping system with requirements of supply and demand, flammability, explosion and high vacuum degree and in high and extremely hazardous occasions. The sealing surface type has plane and convex surface.

Flat plate welding flange is the most common flange, the pressure is pn0.25, pn0.6, PN1.0, pn1.6, pn2.5.

Welding form: plate flat welding flange is to insert the pipe into the flange for welding.

Materials of flat welding flange: 201304.316.316l.0cr18ni9.321.202, carbon steel, 20g, 20g, alloy steel, etc

There are several types of sealing surface of flat welding flange

Concave convex surface (MFM) DN 1300 ~ 3000 DN300 ~ 3000 dn400 ~ 2000 DN300 ~ 800

Tenon surface (TG) DN 1300 ~ 3000 DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 800

Full plane (FF) DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 800

Due to its good comprehensive performance, flat welding flange is widely used in chemical engineering, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, water heating, fire protection, electric power, aerospace, shipbuilding and other basic engineering.