Custom Large Diameter Hot Forging Ring Custom Large Diameter Rolling Steel Hot Forging Ring

its usually refers to the caliber greater than or equal to DN1000, our company 

can currently produce up to DN6000, large diameter flanges are widely used in 

electric power, marine engineering equipment, machinery, chemical industry, wind 

power, sewage treatment and other industries. Common materials are ASTM A105 

16Mn Q345B Q355B Q460C Q550D 20# 316 304 15CrMo 09MnNid 1Cr13 and other 

carbon steel, stainless steel, alloy steel and other materials. Our company prefabricated 

billet by clamping rod hammer, and then use large-scale ring milling machine, supporting

 robot one-time ring milling success, the process to ensure that the flange in the billet

 making process repeatedly forging, so that the internal organization of the flange is uniform, 

grain refinement, so as to ensure that the flange's mechanical properties, and other requirements. 

nternationally, large diameter flange pressure level division commonly used standards are 

ASME B16.5 (American Society of Mechanical Engineers standard) and 

EN 1092 - 1 (European standard) and so on. Taking ASME B16.5 as an example, 

it divides flanges into Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500 and 

Class 2500. In China, flanges are mainly classified according to GB/T 9112 - 9124 series standards. 

It has a certain correspondence with international standards, in which PN series (nominal pressure)

 has PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, etc., and the unit is MPa (MPa).

For example, PN10 flange indicates that the nominal pressure of 10MPa flange, used in a certain 

temperature range to withstand the corresponding pressure of the pipeline connection.