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S31803 Duplex Steel Flanges
  • S31803 Duplex Steel FlangesS31803 Duplex Steel Flanges
  • S31803 Duplex Steel FlangesS31803 Duplex Steel Flanges

S31803 Duplex Steel Flanges

Zhejiang Hangong Flange Technology Co., Ltd. is a professional S31803 duplex steel flanges manufacturer and supplier in China. Our main projects including stainless steel flanges, duplex steel flanges, super duplex steel flange, pipe fitting manufacturing and sales. We have produced S31803 duplex steel flanges for many years, looking forward to reaching a long-term cooperative relationship with you.

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Product Description

1. Upsetting Upsetting is an operation process in which the original billet is forged along the axial direction to reduce its height and increase its cross section. This process is often used to forge gear blanks and other disk-shaped forgings. Upsetting can be divided into two kinds: total upsetting and partial forging.

2. Drawing length Drawing length is a forging process that increases the length of the blank and decreases the section. It is usually used to produce the blank of shaft parts, such as the spindle and connecting rod of the lathe.

3. The forging process in which the punch flushes out through holes or through holes on the blank.

4. Bending forging process in which the billet is bent to a certain Angle or shape.

5. Twist the forging process whereby one part of the blank rotates at an Angle relative to another.

6. Forging process of cutting and dividing billet or cutting out material head.

Parameter (Specification) of S31803 Duplex steel flanges 

Flangee Material

Carbon steel

ASTM A105. ASTM A350 LF1. LF2, CL1/CL2, A234, S235JRG2, P245GH

P250GH, P280GHM 16MN, 20MN ,20#

Stainless steel

ASTM A182, F304/304L, F316/316L

Alloy steel

ASTM A182 A182 F12,F11,F22,F5,F9,F91etc.

Flange Standard


Class 150 Flanges-Class 2500 Flanges


6Bar 10Bar 16Bar 25Bar 40Bar


5K Flanges-20K Flanges


6Bar 10Bar 16Bar 25Bar 40Bar


6Bar 10Bar 16Bar 25Bar 40Bar

Flange TYPE

1.Welding neck Flange; 2.Slip on

3.Blind flange 4.Long welding neck flange

5.Lap joint flange 6.Socket welding

7.Threaded flange 8.Flat flange

Flange Certificate

SIL,GB/T45001-2020 IDT ISO45001:2018,GB/T9001-2016 IDT ISO9001:2015

Our Services of S31803 Duplex steel flanges 

Why HG?
1. Product Diversity: complete supplying chain of piping system products (pipes, tubes, fittings, flanges etc)
2. Quality Control: a professional inspectors team with well-trained knowledge and intelligence;
3. Service: Any request, any problems, we are ready to respond at any time.

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