Flange, also called flange flanges or flange. Flange is a part that connects between shaft and shaft, used for connection between pipe ends; it is also useful for flange on equipment inlet and outlet, used for connection between two equipment.
There are holes on the flanges and bolts make the two flanges tightly connected. The flanges are sealed with gaskets.
The flange is divided into threaded connection (threaded connection) flange, welding flange and clamp flange.


  • According to chemical industry (HG) industry standards:
  • Integral flange (IF)
  • threaded flange (Th)
  • plate flat welding flange (PL)
  • neck butt welding flange (WN)
  • neck flat welding flange (SO)
  • socket welding flange (SW )
  • butt welding ring loose flange (PJ/SE)
  • flat welding ring loose flange (PJ/RJ)
  • lining flange cover (BL(S))
  • flange cover (BL) [2]

According to the petrochemical (SH) industry standard:

  • Threaded flange (PT)
  • butt welding flange (WN)
  • flat welding flange (SO)
  • socket welding flange (SW)
  • loose flange (LJ)
  • flange cover (not shown)

Product color: metallic color
Product features: anti-corrosion, acid and alkali resistance, long service life, etc., reasonable price calculation, smooth surface, acid and alkali resistance, high temperature resistance, beautiful appearance, strong texture performance
Production process: professional integral forging, forging manufacturing, medium plate cutting, medium plate rolling, etc.
Processing method: high-precision CNC lathe turning, ordinary lathe fine turning, argon arc welding and other processing

Carbon Steel (Carbon Steel): ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70 :
Stainless Steel (Stainless Steel): ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8 :
Alloy Steel (Alloy Steel): ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8 :

Production Process:

The production process is mainly divided into four types: forging, casting, cutting and rolling.
(1) Cast flanges and forged flanges:
Casting: The rough shape and size are accurate, the processing volume is small, the cost is low, but there are casting defects (pores, cracks, inclusions):
The internal structure of the casting is poor in streamline (if it is a cutting part, the streamline is worse):
Advantages of castings: more complex shapes can be manufactured with relatively low cost:
Forging: Generally, it has lower carbon content than cast flanges and is not easy to rust. Forgings are streamlined, have a denser structure, and have better mechanical properties than cast flanges:

Improper forging process will also cause large or uneven crystal grains, hardening cracks, and forging costs higher than cast flanges.
Forgings can withstand higher shear and tensile forces than castings.
The advantage of forgings is that the internal structure is uniform, and there are no harmful defects such as pores and inclusions in the casting:
Advantages of forgings: uniform internal structure, no harmful defects such as pores and inclusions in the casting:

(2) Die forging
The full name of die forging is model forging, which is formed by placing the heated blank in a forging die fixed on the die forging equipment.
Basic process of die forging Process of die forging: blanking, heating, pre-forging, final forging, punching and connecting, trimming, quenching and tempering, shot peening. Commonly used processes are upsetting, drawing, bending, punching, and forming.
Commonly used die forging equipment Commonly used die forging equipment includes die forging hammers, hot die forging presses, flat forging machines and friction presses.
In layman’s terms, forged flanges are of better quality and are generally produced by die forging, with fine crystal structure and high strength, and of course the price is more expensive.
Both cast flanges and forged flanges are commonly used manufacturing methods for flanges, depending on the strength requirements of the components to be used. If the requirements are not high, you can also use turned flanges.

(3) Cutting flange
Directly cut the flange with the inner and outer diameter and thickness of the flange on the middle plate, and then process the bolt holes and waterline. The flange produced in this way is called a cut flange, and the maximum diameter of this type of flange is limited by the width of the middle plate.

(4) Rolled flange
The process of cutting the sliver from the middle plate and then rolling it into a circle is called rolling, which is mostly used in the production of some large flanges. After successful rolling, welding, then flattening, and processing of water lines and bolt holes

Scope of Application

Because the flange has good comprehensive performance, it is widely used in basic projects such as chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire fighting, electric power, aerospace, shipbuilding and so on.

Eternal Bliss Alloy Casting & Forging Co, Ltd.


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