Ronsco steel 12821 12820 gost st20 a321 flange 

This kind of flange is made of steel,and stainless steel,and carbon steel,we have all main standards in the world,you can find what you want in our factory.the measurement from dn 40 to dn 2000.

the measurments:

Our advantage

1. Using the resin sand and coated sand casting technology

2.Add the tempering procedure before entering the processing workshop,

3.Use the CNC lathe and pipeline during the whole process.

4.The disc sealing surface use plasma welding machine welding.

5. Every valve must be tested before being sent out of the factory, only qualified ones can be shipped.