ASTM A182 f51 flange

ASTM A182 F51 flange

ASTM A182 F51 is a specification for duplex stainless steel which offers high resistance to different types of corrosion. The Duplex F51 Flanges is able to withstand general corrosion, crevice corrosion, and pitting. The Uns S31803 Duplex Stainless Steel Blind Flange has high weldability and mechanical strength. This is why the Duplex F51 Weld Neck Flange material is suitable for applications which take place in chloride and hydrogen sulphide containing environments. The Sa 182 F51 Slip On Flanges come with a minimum yield strength of 450 MPa, and minimum tensile strength of 620 MPa. The ASTM A182 F51 Flanges are widely used for various applications in industries like petrochemical, petroleum, and other high performing piping systems.

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UNS S31803 blind flanges and SA 182 f51 threaded flange suppliers in UAE

A182 F51 material specification

Astm A182 F51 Flange Specification

Sizes Sealing Types Suitable Temperature of A182 F51 forging material (minimum)
  • 15NB – 1200NB
  • 1/2″ to 48″
  • PN 2.5 – PN 400

For custom drawing get in touch with top 10 ASTM A182 F51 flange suppliers in UAE

  • ASTM A182 UNS S31803 Lap Joint flange – LJ
  • Flat Face or Plain Face F51 duplex Steel flange (FF)
  • F51 Duplex RTJ flange- Ring Joint
  • Tongue and Groove – T&G
  • Raised Face (RF)
  • Male Female face – M&F
  • -60°F
  • -51°C
ASTM A182 UNS S31803 blind flange Meet The Requirements Of Inspection Checklist Of A182 UNS S31803 Slip On Flange Connection
  • NACE MR0175
  • NACE MR0103
  • NACE TM-0284
  • ISO 15156
  • Sour service
  • Tensile test
  • Material inspection
  • PMI Test (Positive Material Identification)
  • Impact test
  • Visual inspection
  • Hardness test
  • Shell pressure test
  • Welded
  • Threaded
Marking Method Finish Types Of Duplex F51 Flange ASTM A182 F51 Flange Applications and Uses
  • Sizes (NPS)
  • Type Of facing
  • Standard Of ASTM and ASME
  • Pressure rating
  • Origin of material
  • Manufacturer logo & name
  • Grade and material name
  • Smooth Finish – (63-125 AA)
  • Mirror Finish / Cold Water Finish
  • Serrated finish – (Required 30 to 55 grooves per inches)
  • Spiral Serrated – (Generated using a 90-deg tool)
  • Concentric Serrated – (125 and 500 micro inches)
  • Stock Finish – 125- to 250-μin
  • Petrochemical plants
  • Nuclear energy sector
  • Industrial pressure vessels
  • High and Low pressure piping connection
  • Power generation plant
  • Construction & mechanical systems

Genuine ASTM A182 F51 flange suppliers in UAE, these listed manufacturers & distributors have vast experience in exporting ASTM A182 UNS S31803 flanges to USA, Egypt, Saudi Arabia, South Africa, Oman & Middle east

F51 Flange Joint Types Available Schedule Bolts Hole
  • Welded joint
  • Threaded joint
  • Bolted 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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Types Of ASTM A182 F51 Slip On Flange Types Of A182 F51 Weld Neck Flanges Types Of ASTM A182 Grade F51 Blind Flange
  • ASTM A182 UNS S31803 slip on raised face flange
  • A182 UNS S31803 slip on flat face flange
  • F51 Duplex slip on reducing flange
  • A182 gr F51 slip on RTJ flange
  • A182 F51 Duplex slip on blind flange
  • ASTM A182 Grade F51 slip on welding flange
  • ASTM A182 gr F51 raised face weld neck flange
  • UNS S31803 F51 flat face weld neck flange
  • F51 duplex stainless steel long weld neck flange
  • ASTM A182 F51 UNS S31803 ring type joint weld neck flange
  • ASTM A182F51 weld neck orifice flange
  • A182 F51 duplex stainless steel weld neck blind flanges
  • SA182F51 weld neck slip on flanges
  • ASTM A182 UNS S31803 raised face blind flanges
  • F51 duplex steel flat face blind flanges
  • A182 F51 ring type joint blind flanges
  • ASTM A182 Grade F51 threaded blind flanges
  • 1.4462 F51 blind slip on flanges
  • SA182 F51 weld neck flanges
  • ASTM A182 F51 UNS S31803 socket weld blind flanges
Machining Process Of A182 F51 Duplex Stainless Steel Flanges Thread Types Of Threaded or UNS S31803 F51 Screwed Flanges Value added services
  • Material selection & cutting
  • Shaping & heat treatment
  • Forming & forging
  • Machining & surface finish
  • Inspection & quality control
  • NPT
  • BSP
  • MNPT (Male)
  • FPT
  • BSPT (Female)
  • BSPP (Female & male)
  • MPT
  • FNPT (Female) – ASME B1.20.1
  • De-burring
  • Tagging and marking
  • Cutting
  • Beveling end
  • Drilling
  • Polishing
  • Sand Blasting
  • MTR’s Available
  • Minor Fabrication
  • Pickled
  • Fastest delivery in Middle east
  • CNC machined
  • Casting
  • Electroplating
  • Fabricate (100% Radiography)
  • Threading
  • Forging
  • Metal stampings
  • Heat Treatment (Hardening and Tempering)
  • Rolling
Pressure Rating of A182 Gr F51 Material Maximum Design Temperature Manufacturing Way Of UNS S31803 F51 Pipe Flange
  • Class 150
  • Class 300
  • Class 600
  • Class 900
  • Class 1500
  • Class 2500
  • 600°F
  • 315°C
  • ASTM A182 S31803 forged flange (Most popular) – ASTM A182 Grade F51
  • F51 plate flange- ASTM A240 UNS S31803
  • UNS S31803 casting flange- ASTM A995/ A995M


Astm A182 F51 Flange Standard Specification

Buy ASME b16.5 duplex f51 weld neck flange and SA182 f51 slip on flanges in class 150 to 2500 in Dubai, check UNS S31803 flange is magnetic

Chromium content of ASTM A182 F51 flange

  • Chromium Min : 21%
  • Chromium Max : 23%


F51 flange manufacturing standards and origin

Manufacturing Standards Origin Country
BS EN 1092-1 (Steel) Europe
BS EN 1092-3 (Alloy) Europe
BS 10 Australia and UK
EN Europe
PN Europe
JIS Japan
BS EN 1092-2 (Iron) Europe
DIN Germany
KS Korea
MS 816 Malaysia
CSA B16.5/ B16.47 Canada
GB/T 9112 / 9119 China
MS 253 Malaysia
UNI 2276/ 6091 Italy
Ghost Russia


Different types of UNS S31803 forged flanges

  • ASTM A182 UNS S31803 blind flange
  • A182 UNS S31803 slip on flange
  • ASTM A182 S31803 weld neck flange
  • ASTM A182 F51 socket weld flange
  • F51 Duplex Steel threaded flange
  • SA 182 F51 reducing flange
  • F51 Duplex plate flanges


Weight of ASME SA182 F51 BLRF flanges

Class 150 (in LBS)

Normal Pipe Size Blind flange
1/2 1.98
3/4 1.98
1 1.98
2 11.17
3 19.90
4 16.97
5 19.84
6 26.89
8 46.73
10 69.44
12 122.13
14 138.8
16 178.5
18 218.25
20 282.8
22 352.29
24 426.59


Components of duplex F51 flange


SA 182 F51 flanges heat treatment

Cooling Media Quenching Cool Below Tempering Temperature, Minimum or Range, °F [°C] Type Of Heat Treat Solutioning and Austenitizing Temperature
  • 500 °F
  • 260 °C
B solution treat and quench
  • 1870 °F
  • 1020 °C


A182 Gr F51 equivalent

ASTM A182 Duplex F51 UNS 31803 1.4462 SUS 329J3L


SA 182 F51 chemical composition

Elements Composition
Iron Balance
Chromium 21.00-23.00
Manganese ≤2.00
Silicon ≤1.00
Phosphorous 0-0.03
Carbon 0-0.03
Nickel 4.50-6.50
Nitrogen 0.08-0.20
Molybdenum 2.50-3.50
Sulfur 0-0.02


ASTM A182 F51 mechanical properties

Elongation, (minimum) Hardness Brinell, (maximum) Tensile Strength, (minimum). Yield Strength, (minimum)
% HB Mpa Mpa
25 290 620 450

Astm A182 F51 Flange Properties

1.4462 F51 flange temperature rating

Temperature In (°c) Temperature and pressure rating in Bar
CL 150 (LBS) CL 300 (LBS) CL 600 (LBS) CL 900 (LBS) CL 1500 (LBS) CL 2500 (LBS)
-29 to 38 20.0 51.7 103.4 155.1 258.6 430.9
50 19.5 51.7 103.4 155.1 258.6 430.9
100 17.7 50.7 101.3 152.0 253.3 422.2
200 13.8 42.7 85.3 128.0 213.3 355.4
300 10.2 38.9 77.7 116.6 194.3 323.8


Get benefits of the lowest price & custom sizes when buying from verified UNS S31803 F51 flanges manufacturers & suppliers in the middle east and South Korea, view sizes & thickness chart

The F51 Flange thickness can be measured with the given formula:

tm = t + c
Where, t= d √(CP/SE + 1.9 WhG / SEd3),
Here, d= diameter,
C= a factor that depends on the head attachment method, shell dimensions, etc.
E= joint efficiency
HG= gasket moment arm
W= total bolt load for a given circular head
P= internal design pressure
S= maximum allowable stress value

Class 150 ASTM A182 F51 Socket Weld Flanges can withstand 270 psi pressure at ambient temperature conditions. It’s capacity to withstand pressure decreases with the increase in the temperature.

The UNS S31803 flange are magnetic in nature.

Contact for any size or quantity and get a free quotation from verified and genuine ASTM A182 Grade F51 flanges suppliers in Dubai, check the advantages of A182 F51 duplex flanges

The advantage of the Sa 182 F51 Flanges hot forging process is that it results in optimal yield strength, high ductility, and low hardness. It is achieve by hardening the material at an extremely high temperature.

Buy F51 duplex steel flanges from ADNOC approved a182 f51 material with 100% inspection & ultrasonic test (UT)

The MTC and hydro test report of Sa182 S31803 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 ultrasonic test can be performed wherein the flanges are ultrasonically tested. The flanges are also tested for their microstructure.