Duplex flanges

duplex flanges

The duplex material belongs to the family of stainless steel. It comes with a combination of two phases, ferrite and austenite in equal amounts. DSS pipe flanges come with increased strength and high toughness. Duplex flanges are also known for its high weldability, and resistance to different types of corrosions. DSS Flange material has a low nickel content and thus, they are cheaper compared to the austenitic stainless steel.

The Duplex Steel Slip On Flanges show higher yield strength, compared to the typical; martensitic, austenitic, and ferritic grades. However, the working temperature of ASTM A182 Duplex Steel Threaded Flanges is quite narrow as they are prone to precipitation due to intermetallic phase, which starts occurring above 300 degrees C. The properties help the ASME SA182 Duplex Steel Socket weld Flanges to be used in industries like paper production, desalination, oil and gas, construction, etc.

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Duplex steel flanges specification


Duplex Flange Specification

Manufacturing Size Range Of Duplex Steel Flange Faces Types Suitable Temperature Of Duplex Stainless Steel Flanges
  • 1/2″ to 48″
  • 15NB – 1200NB
  • PN 2.5 – PN 400
  • For larger sizes please contact above duplex flange manufacturers & suppliers in UAE
  • Flat Face or Plain Face duplex steel pipe flange (FF)
  • Raised Face (RF)
  • Duplex RTJ flange- Ring Joint
  • Tongue and Groove – T&G
  • Male Female face – M&F
  • Duplex Lap Joint flange – LJ
  • 250°-500°C
  • 1900-2100°F
Duplex Flange Material Pressure Class Most Common Types Of Duplex Stainless Flanges Manufacturing Technique Of Duplex Stainless Steel Flange Material
  • 150#
  • 300#
  • 600#
  • 900#
  • 1500#
  • 2500#
  • Socket weld flanges
  • Slip on flanges
  • Lap joint flanges
  • Weld neck flanges
  • Blind flanges
  • Reducing flange
  • Threaded flanges
  • Duplex steel forged flange (Most popular) – ASTM A182 / A182M
  • Duplex SS plate flange- ASTM A240/ A240M
  • Duplex cast flange- ASTM A995/ A995M
Types Of Duplex Blind Flanges Types Of Duplex Weld Neck Flanges Connection
  • Stainless steel duplex raised face blind flanges
  • Duplex flat face blind flanges
  • DSS ring type joint blind flanges
  • Duplex SS threaded blind flanges
  • Duplex stainless blind slip on flanges
  • Blind weld neck flanges
  • SA182 Duplex steel socket weld blind flanges
  • ASTM A182 duplex steel raised face weld neck flanges
  • Duplex steel ring type joint weld neck flanges
  • SA 182 duplex flat face weld neck flanges
  • Duplex stainless steel long weld neck flanges / LWNRF
  • A182 DSS weld neck orifice flanges
  • Threaded
  • Welded
Marking Duplex Socket Weld Flange Finish SA 182 Duplex Flange Installations & Applications
  • Manufacturer logo / name
  • Grade and material name
  • Sizes (NPS)
  • Standard Of ASTM and ASME
  • Type Of facing
  • Pressure rating
  • Origin of material
  • Above duplex flanges suppliers have ex-stock and already supplied to many countries such as South Africa, Middle east, Egypt, Oman & Saudi Arabia
  • Stock Finish – 125- to 250-μin
  • Serrated finish – (Required 30 to 55 grooves per inches)
  • Spiral Serrated – (Generated using a 90-deg tool)
  • Concentric Serrated – (125 and 500 micro inches)
  • Smooth Finish – (63-125 AA)
  • Mirror Finish / Cold Water Finish
  • Petrochemical plants
  • Nuclear energy sector
  • Power generation plant
  • Construction & mechanical systems
  • Industrial pressure vessels
  • High and Low pressure piping connection
German Standard Of DSS Flange Thread Types Of companion/ Screwed or Duplex Threaded Flanges Value added services
  • DIN 2578, 2573 Type 1 – Flat
  • DIN 2527 Type 5 – Blind
  • DIN 2627 to 2638 Type 11 – Weld neck
  • DIN 2558, 2565, 2566, 2567, 2568, 2569 Type 12 – Threaded
  • DIN 2622, 2641, 2655, 2656 Type 2, 4 – Lapped
  • NPT
  • MPT
  • FNPT (Female) – ASME B1.20.1
  • BSP
  • MNPT (Male)
  • FPT
  • BSPP (Female & male)
  • BSPT (Female)
  • Fastest delivery in Middle east
  • CNC machined
  • Casting
  • Threading
  • Forging
  • Metal stampings
  • Heat Treatment (Hardening and Tempering)
  • Tagging and marking
  • Cutting
  • Beveling end
  • Drilling
  • Polishing
  • Electroplating
  • Fabricate (100% Radiography)
  • MTR’s Available
  • Minor Fabrication
  • Pickled
  • Rolling
  • Sand Blasting
  • De-burring
Stainless Steel Duplex Flanges Meet The Requirements Of ASTM A182 Duplex Steel Flanges Testing Requirements Duplex Pipe Flange Manufacturing Standards and Origin Country
  • NACE MR0103
  • NACE TM-0284
  • ISO 15156
  • Sour service
  • NACE MR0175
  • Impact test
  • Visual inspection
  • Shell pressure test
  • Material inspection
  • PMI Test (Positive Material Identification)
  • Hardness test
  • Tensile test
  • Europe – BS EN 1092-1 (Steel)
  • Europe – BS EN 1092-3 (Alloy)
  • USA – ANSI
  • Australia and UK – BS 10
  • USA – ASME
  • USA – ASTM
  • Europe – EN
  • Europe – PN
  • Japan – JIS
  • Europe – BS EN 1092-2 (Iron)
  • Germany – DIN
  • USA – MSS SP44
  • USA – ASA
  • Korea – KS
  • USA – Class (CL) 125 (Light weight)
  • Malaysia – MS 816
  • Australia – AS 2129
  • Canada – CSA B16.5/ B16.47
  • China – GB/T 9112 / 9119
  • USA – API-605
  • Malaysia – MS 253
  • Europe – ISO 7005
  • USA – AWWA
  • Framce – NF E 29-200/ NF E 29-203
  • Italy – UNI 2276/ 6091
  • Russia – Ghost
Types Of Joint Thickness Bolts Hole
  • Threaded joint
  • Bolted joint
  • Welded joint
  • SCH 10
  • SCH 20
  • SCH 40
  • SCH 60
  • SCH 80
  • SCH 100
  • SCH 120
  • SCH 140
  • SCH 160
  • SCH 180
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Buy duplex stainless steel flanges from GASCO approved suppliers at the best price in Dubai

Duplex Flanges Standard Specification

Grades of duplex stainless steel flanges

Types of duplex flanges

Duplex Ring Type Joint flange

Duplex Ring Type Joint flange

DSS plate flange

DSS plate flange

Duplex Stainless Socket Weld flanges

Duplex Stainless Socket Weld flanges

DSS raised face flange

DSS raised face flange

Stainless Steel Duplex Spectacle Blind flanges

Stainless Steel Duplex Spectacle Blind flanges

Duplex Blind flanges

Duplex Blind flanges

DSS Lap Joint flange

DSS Lap Joint flange

ASTM A182 duplex steel slip on flanges

ASTM A182 duplex steel slip on flanges

ASME B16.5 duplex steel weld neck flange

ASME B16.5 duplex steel weld neck flange

Duplex steel threaded flange

Duplex steel threaded flange

DSS Forged flanges

DSS Forged flanges

Duplex stainless steel orifice flange

Duplex stainless steel orifice flange

Duplex flange pressure rating

Temperature in (°F) Working Pressure by PSI
CL 75 CL 150 CL 300 CL 400 CL 600 CL 900 CL 1500 CL 2500
-20~100°F 145 290 750 1000 1500 2250 3750 6250
200°F 130 260 745 990 1490 2230 3720 6200
300°F 115 230 665 890 1335 2000 3335 5560
400°F 100 200 615 820 1230 1845 3070 5120
500°F 85 170 580 775 1160 1740 2905 4840
600°F 70 140 555 740 1115 1670 2785 4640
650°F 60 125 545 730 1095 1640 2735 4560
700°F 110 540 725 1085 1625 2710 4520
750°F 95 530 710 1065 1595 2660 4430

 

HS code of duplex stainless flanges

  • HS Code 73072100

 


Duplex flanges ASTM standard & equivalent chart

ASTM Standard Equivalent
ASME B16.5 – Class 150 – 2500LBS UNS S31803 (ASTM A182 F51)
ASME B16.47 – Series A/ B UNS S32205 (ASTM A182 F60)
ASME B16.36 – (DSS Orifice) WNR 1.4462
ASME B16.48 – (Duplex Spectacle Blinds) BS 318S13
ASME B16.20 – (RTJ Gaskets for Duplex Steel Flanges) JIS SUS 329J3L
ASME B16.34 – (Large Diameter Duplex Flanges)

 

Duplex flange weight

Normal Pipe Size Blind flange Weld Neck flange Slip On flange Socket Weld flange
1/2 1.98 1.98 1.10 1.98
3/4 1.98 1.98 1.98 1.98
1 1.98 3.08 1.98 1.98
3.08 3.08 3.08 3.08
3.96 3.96 3.08 3.08
2 11.17 5.95 5.07 5.07
7.05 9.92 7.93 7.93
3 19.90 11.46 9.03 9.03
13.00 11.90 8.81 8.81
4 16.97 16.31 13.00 13.00
5 19.84 20.94 14.99 14.99
6 26.89 25.79 18.95 18.95
8 46.73 41.66 29.76 29.76
10 69.44 53.57 42.76 42.76
12 122.13 87.30 63.49 63.49
14 138.8 113.09 89.28 89.28
16 178.5 138.89 105.16 97.22
18 218.25 163.80 128.97 128.97
20 282.8 195.55 163.80 163.80
22 352.29 223.32 183.64 183.64
24 426.59 265.87 218.25 218.25

 

Suitable components of duplex forged flanges

 

Bolting chart for class 150 duplex blind flange

DN Bolts Number Length Of RF Stud Length Of Machine Bolt Size Of Bolt in UNC
15 4 55 50 1/2
20 4 65 50 1/2
25 4 65 55 1/2
32 4 70 55 1/2
40 4 70 65 1/2
50 4 85 70 5/8
65 4 90 75 5/8
80 4 90 75 5/8
90 8 90 75 5/8
100 8 90 75 5/8
125 8 95 85 3/4
150 8 100 85 3/4
200 8 110 90 3/4
250 12 115 100 7/8
300 12 120 100 7/8
350 12 135 115 1
400 16 135 115 1
450 16 145 125 1 1/8
500 20 160 140 1 1/8
600 20 170 150 1 1/4

 

Duplex slip on flange type

  • Duplex stainless steel slip on raised face flange
  • Duplex steel slip on flat face flange
  • Duplex stainless slip on reducing flange
  • Duplex slip on rtj flange
  • DSS slip on blind flange
  • ASTM A182 duplex slip on welding flange

 

5 difference between duplex weld neck flange and socket weld flange

Duplex weld neck flange Duplex socket weld flange
Handle higher pressures Not carry high pressure temperatures
Higher fatigue strength Easier to align
More expensive Less expensive
Used for larger-diameter pipes (½”- 4″) Used with smaller pipe sizes (3/8″ – 10″)
Duplex WNRF flanges attach it to the pipe using techniques (TIG) or (SMAW) Connected to the pipe by welding

 

Chemical composition of duplex SS flanges

Duplex flange type C Cr Mn Mo N Ni P S Si
UNS S31803 casting flange 0.030 (max) 21.0-23.0 2.00 (max) 2.50- 3.50 0.08-0.20 4.50-6.50 0.030 (max) 0.020 (max) 1.00 (max)
UNS S32205 casting flange 0.030 (max) 22.0-23.0 2.00 (max) 3.00-3.50 0.14-0.20 4.50-6.50 0.030 (max) 0.020 (max) 1.00 (max)
UNS S31803 forged flange 0.030 21.0-23.0 2.0 2.50-3.50 0.080-0.20 4.50-6.50 0.030 0.020 1.0
UNS S32205 forged flange 0.030 23.0 2.00 3.5 0.20 6.5 0.030 0.020 1.00

 

Duplex flange material mechanical properties

Properties UNS 31803 casting flange UNS S31803 forged flange
Yield Strength >450Mpa (65KS I) 621 (MPa) min
Tensile Strength >620Mpa (90KSI) 448 (MPa)
Elongation (Min) 25% 25%
Reduction of Area (50mm) 45%
Hardness (HB) 270 HB maximum 293 HB maximum

 

Physical properties of duplex pipe flanges

Density (kg/m3) 7800
Thermal Conductivity (at 100°C) 19
Electrical Resistivity (nΩ.m) 850
Elastic Modulus (GPa) 190
Specific Heat 0-100°C ( J/kg.K) 418

Duplex Flanges Properties

Chromium content of duplex pipe flange

  • Chromium Content : 22%

Connect by live chat with verified duplex steel flange manufacturers & suppliers middle east countries

The primary advantage of ASME B16.5 Duplex Steel Forged Flange is that it offers extremely cost-effective performance compared to the other alloys. The disadvantage is, it has low versatility, low toughness, and it also has a low range of working temperature as it is prone to precipitation.

The MTC and hydro test report of Astm a182 DSS slip on flanges contain the following:

  • At the top, you will get information about the manufacturer who manufactured the material.
  • The heat number or lot number is specified in the test. All the material properties including chemical properties, mechanical properties, etc., are linked with the heat number. These properties are known as the technical delivery conditions.
  • The test report also contains the material specification and grade. While reading the reports, these should be matched with the minimum requirements given in material specification for technical and delivery conditions.
  • The MTC should also comply with the delivery conditions, like manufacturing process, type of flange, etc.
  • It also has a material dimension.
  • The mechanical properties will be present in the MTC for each heat number.
  • Additional testing, like hydro test can be performed wherein the flanges are ultrasonically tested. The flanges are also tested for their microstructure.
Looking for a duplex stainless steel threaded flanges manufacturer? ASME/ ANSI B16.5 duplex forged flange is available in various sizes & types including slip on, blind, socket weld, and weld neck

The size of the Duplex Ss Flanges are given by the manufacturer and they will also be present in the MTC test reports.

Talk to multiple trusted duplex ss flange suppliers and DSS RTJ flanges for best price, check whether ASTM A182 duplex steel reducing flanges are magnetic or not

Due to the ferrite content, the Duplex Blind Flange is magnetic.