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We are among the most trusted and certified organizations, engaged in manufacturing and supplying Customized Stainless Steel Flanges.

A flange is a method of connecting pipes, valves, pumps and other equipments to form a piping structure. Customised flanges are the type of flanges esential to getting a job done right. Kobs India offers the standard component in all materials, grades, size and shape. Customised flanges are widely used in special conditions and offering the main advantages that they can be fitted without any requirement of welding.

We are the leading manufacturer of a wide collection of ANSI/ASME B16.5 Customised Flange manufactured according to the ANSI/ASME or custom standards.

Standards Specification:

  • Size : 1/2" to 48"
  • Specifications : ASTM A182
  • Rating: 150#, 300#, 600 (2.4640)#, 900#, 1500#, 2500#,

Material & Grade :

Stainless Steel :
Grade: 304 (1.4301), 304L (1.4307), 304H (1.4948), 309 (1.4828), 309S, 310, 310S (1.4845) , 316 ( 1.4401), 316H, 316L( 1.4404 /1.4432) , 317, 317L (1.4438), 321 (1.4541), 321 H(1.4878), 347 (1.4550), 347H (1.4961), 904L (1.4539)

Chemical Composition 304 (1.4301), 304L (1.4307), 304H (1.4948)

C Mn Si P S Cr Ni N
304 (1.4301) 0.07max 2.0max 0.75max 0.045max 0.03max min: 18.0 max: 20.0 min: 8.0 max: 10.5
304L (1.4307) 0.03max 2.0max 0.75max 0.045max 0.03max min: 18.0 max: 20.0 min: 8.0 max: 12.0 0.10 max
304H (1.4948) min: 18.0
max:20.0
min: 8.0
max: 10.5
min: 0.04
max:0.10
0.75
max
2.0
max
0.045
max
0.03
max
0.10
max

Chemical Composition 309 (1.4828), 310, 310S (1.4845)

SS 309 (1.4828)SS 310SS 310S (1.4845)
Ni 14 max 19 – 22 19 – 22
Cr 23 max 24 – 26 24 – 26
C 0.20 max 0.25 max 0.08 max
Fe 60 max Balance
Mn 2 max 2 max 2 max
Si 1 max 1.50 max 1.50 max
S 0.030 max 0.03 max 0.03 max
P 0.045 max 0.045 max 0.045 max

Chemical Composition 316 ( 1.4401), 316L( 1.4404 /1.4432), 316H

C Mn Si P S Cr Mo Ni N
316 ( 1.4401)
0.08
max
2.0
max
0.75
max
0.045
max
0.03
max
min: 16.0
max: 18.0
min: 2.0
max: 3.0
min: 10.0
max: 14.0
0.10
max
316L( 1.4404 /1.4432)
0.03
max
2.0
max
0.75
max
0.045
max
0.03
max
min: 16.0
max: 18.0
min: 2.0
max: 3.0
min: 10.0
max: 14.0
0.10
max
316H - - - - - 16.0 2.00 10.0 -
0.08 2 0.75 0.045 0.03 18.0 3.00 14.0 0.1

Chemical Composition 317, 317L (1.4438)

Grade C Mn Si P S Cr Mo Ni N
317 0.08 max 2 max 1 max 0.040 max 0.03 max 18 – 20 3 – 4 11 – 14 -
317L (1.4438) 0.035 max 2 max 1 max 0.040 max 0.03 max 18 – 20 3 – 4 11 – 15 -

Chemical Composition 321 (1.4541), 321 H(1.4878)

% Cr Ni C Si Mn P S N Ti Fe
321 (1.4541) min:17.0
max:19.0
min: 9.0
max:12.0
max:0.08 max:0.75 max:2.0 max:0.045 max:0.03 max:0.10 min:5*(C+N)
max:0.70
Balance
321 H(1.4878) min:17.0
max:19.0
min: 9.0
max:12.0
min:0.04
max:0.10
min:18.0
max:20.0
max:2.0 max:0.045 max:0.03 max:0.10 min:5*(C+N)
max:0.70
Balance

Chemical Composition 347 (1.4550), 347H (1.4961)

C Cr Mn Ni P S Si Cb/Ta
347 (1.4550) 0.08 max min: 17.0
max: 20.0
2.0 max min: 9.0
max: 13.0
0.04 max 0.30
max
0.75
max
min:10x C
max: 1.0
347H (1.4961) min: 0.04
max: 0.10
min: 17.0
max: 20.0
2.0 max min: 9.0
max: 13.0
0.03 max 0.30
max
0.75
max
min:10x C
max: 1.0

Chemical Composition 904L (1.4539)

C Cr Cu Mn Mo Ni P S
Max     Max     Max Max
0.02 19.0-23.0 2.0 4.0-5.0 23.0-28.0 0.045 0.035 1.0

Mechanical Properties 309 (1.4828) / 310 / 310S (1.4845)

Grade Tensile Strength ksi (min) Yield Strength 0.2% ksi (min) Elongation % Hardness (Brinell) MAX Hardness (Rockwell B) MAX
304 (1.4301) 75 30 40 201 92
304L (1.4307) 70 25 40 201 92
304H (1.4948) 75 30 40 201 92

Mechanical Properties 316 ( 1.4401), 316L( 1.4404 /1.4432), 316H

Grade Tensile Strength
ksi (min)
Yield Strength
0.2% ksi (min)
Elongation % Hardness (Brinell) MAX Hardness
(Rockwell B) MAX
316 ( 1.4401)
75 30 40 217 95
316L( 1.4404 /1.4432)
70 25 40 217 95
316TI 515(Mpa) 205(Mpa) 35 205 75

Mechanical Properties 317, 317L (1.4438)

Density 8.0 g/cm3
Melting Point 1454 °C (2650 °F)
Tensile Strength Psi – 75000 , MPa – 515
Yield Strength (0.2%Offset) Psi – 30000 , MPa – 205
Elongation 35 %

Mechanical Properties 321 (1.4541), 321 H(1.4878)

Grade Tensile Strength
ksi (min.)
Yield Strength 0.2%
Offset ksi (min.)
Elongation -
% in
50 mm (min.)
Hardness
(Brinell) MAX
321 (1.4541)/321 H(1.4878) 75 30 40 217

Mechanical Properties 347 (1.4550), 347H (1.4961)

Grade Tensile Strength ksi (MPa) min Yield Strength 0.2% ksi offset ksi (MPa) min Elongation (% in 50mm) min Hardness (Brinell) MAX Hardness (Rockwell B) MAX
347 (1.4550)/347H (1.4961) 75
(515)
30
(205)
40 201 95

Mechanical Properties 904L (1.4539)

Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
Rockwell B (HR B) Brinell (HB)
904L (1.4539) 490 220 36 70-90 typical 150

Product Features:

  • Low cost installation
  • Less time needed to spent on ensuring the accuracy of the cut pipe
  • They are somewhat easier to align
  • The flange is welded both inside and outside to provide sufficient strength
  • They prevent leakage

Other grades also available :

Duplex Steel:
Grade: 2205 (1.4507)
Nickel :
Grade: Nickel 200, Nickel 201
Super Duplex Steel:
Grade: 2507 (UNS S32750) (1.4410) (UNS S32750), Z100
Inconel :
Grade: Inconel 600 (2.4640), Inconel 601 (2.4851), Inconel 625 (2.4856), Inconel 718(2.4668)
Titanium :
Grade: Gr.1 (3.7025) , Gr.2 (3.7035) , Gr.3:(3.7055) , Gr.5(3.7164/65), Gr. 7(3.7235) , Gr. 11 (3.7225)
Monel :
Grade: Monel 400 ( 2.4360), Monel K500, Monel R-405
Hastalloy :
Grade: Hastalloy B2, Hastalloy B3, Hastalloy C22, Hastalloy C276, Hastalloy X
Incoloy :
Grade: Incoloy 800 (2.4958), Incoloy 800H, Incoloy 800HT

Manufacturing Process :

The manufacturing process of flange mainly is divided into forging, casting, cutting and rolling. .

The casting and forging flanges have advantages that the blanks of them have accurate shape, size and low costs and only need simple process. But forging flanges have manufacturing defects such as blowholes, cracks, etc and have not very smooth internal organization streamline. The obvious advantages of forging flanges are that they can be forged in various shapes and they have low costs. .

Forging flanges generally have lower carbon content than the casting flanges and are not easy to rust. They have smooth streamline, uniform internal organization, and better mechanical performance than that of casting flanges. There are no defects, such as blowholes and cracks existing in the casting flanges. Forging flanges are able to withstand higher shear and drawing forces than casting flanges. However, if adopting improper forging process, it will also cause appearance of large, uneven grains and solidification cracking phenomenon, resulting in higher cost than the casting flanges. .

We can distinguish between the casting flanges and forging flanges from the different production process. To take the centrifugal flange as an example, it is a kind of casting flange. Centrifugal flanges are produced by a precision casting method, which makes the flanges’ organization smaller than those commonly produced by sand casting and improves the quality of flanges, making fewer occurrences of loose tissue, pore, sand hole etc.

Cutting process refers to producing flanges by directly cutting a round plate with the inner diameter, outer diameter and thickness which can be further processed later from the middle plate, and then processing the bolt hole and waterline. The maximum diameter of such flanges is limited by the width of the middle plate.

Cutting process refers to producing flanges by cutting stripes from the middle plate and then rolling them into round shape. This process is mainly used for the production of large flange. After the rolling process, weld and then flatten the round shape, and finally process the serrated spiral finish and bolt hole.

Product Usage & Application :

  • Useful in Paper & Pulp Companies
  • Useful in High Pressure Applications
  • Useful in Oil and Gas Industry
  • Useful in Chemical Refinery
  • Useful in Pipeline
  • Useful in High Temperature Application
  • Useful in Water Pipe Line
  • Useful in Nuclear Power Plants
  • Useful in Food Processing and Dairy Industries
  • Useful in Boiler & Heat Exchangers

Packing :

  • Packing is quite important especially in a case of international shipments in which consignment pass through various channels to reach the ultimate destination, so we put special concern regarding packaging.
  • We pack our goods in numerous ways based on the products. We pack our products in multiple ways, such as,
    • Shrink-wrapped
    • Carton boxes
    • Wooden pallets
    • Wooden boxes
    • Wooden crates

Why Choose Us :

  • You can get the perfect material according to your requirement at the least possible price.
  • We also offer Reworks, FOB, CFR, CIF, and door to door delivery prices. We suggest you to do deal for shipping which will be quite economical.
  • The materials we provide are completely verifiable, right from raw material test certificate to the final dimensional statement.(Reports will show on requirement)
  • e guarantee to give a response within 24hours(usually in the same hour)
  • You can get stock alternatives, mill deliveries with minimizing manufacturing time.
  • We are fully dedicated to our customers. If it will not possible to meet your requirements after examining all options, we will not mislead you by making false promises which will create good customer relations.

Tests we carry out (including both Destructive and Non-Destructive) :

  • Positive material recognition
  • Mechanical examining like tensile, Elongation and reduction of area.
  • Large-scale test
  • Chemical examination-Spectro analysis
  • Firmness test
  • Pitting protection test
  • Small tests
  • X-ray test
  • Impact analysis
  • Eddy current examining
  • Hydrostatic analysis
  • Prompt test

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