What are the benefits of stainless steel 904L flanges in terms of corrosion resistance?

This grade is well-known for delivering corrosion resistance when faced with nitric acid, chlorides, and seawater. Stainless steel 904L flanges can resist pitting and crevice corrosion, providing reliability over time with little maintenance. Another advantage of these components is their dimensional tolerance, retained amid wear and tear.

The low sulphur amount and addition of molybdenum are instrumental in avoiding localised corrosion and protecting against carbide precipitation. In additional advantages, an INOX 904L RTJ flanges possesses durability and malleability at high temperatures. Formability makes it simpler to create flanges in customised shapes and dimensions.

SS 904L flanges manufacturer in India at lowest price

Stainless steel 904L flanges manufacturer in India

What is the procedure for installing ASTM A182 F904L slip on flanges?

Slip-on flanges get installed easily, connecting to the pipe through a fillet weld (or two). ASTM A182 F904L slip on flanges can just get slid onto the pipeline – direct and quick installation. The technician fixes the fitting at the desired location via a weld.

Dual welds are required and recommended: one out and the other inside. But you may use a single weld if the application permits it. Buyers can also pick SS 904L lapped joint flanges as they are quite similar and quick to assemble (and dismantle).

ONGC approved ASTM A182 F904L slip on and blind flanges supplier in Mumbai

Stainless steel 904L flanges

Stainless steel 904L flanges

ASTM A182 F904L slip on flanges

ASTM A182 F904L slip on flanges

SS 904L flanges

SS 904L flanges

How can I make sure my SS 904L flanges are of high quality? (write about testing, quality certificate, third party inspection)

Various critical sectors – from medical to aircraft parts and food processing – use these flanges for leak-proof connections. You can assure the quality by sourcing SS 904L flanges from reliable manufacturers. The most dependable method is to demand a quality certificate (Mill Test Report) with full traceability, properties, and product specifications.

Trusted providers also conduct meticulous testing on A182 F904L threaded flanges through NDT procedures. These include ultrasonic examination, spectrography, and visual inspection. A dye penetrant test may get performed on the weld. Buyers can also get a third-party inspection from an accredited laboratory for additional quality assurance in DIN 1.4539 reducing flanges.

Buy SA 182 904L weld neck and threaded flanges in Class 150 to 2500 as well as custom sizes to complete your project with prompt delivery.

Table of Content

Stainless steel 904L flanges specifications

Stainless steel 904L flanges specifications

Size Pressure Production technique
1/2 to 60 inch NB PN6 to PN64 Heat treated , Forged and machined
Specification Types Face type
ASTM A182 | ASME SA182 Blind, Slip On, Weld neck, Reducing flanges FF, RF, RTJ
Class Standard Application
150# to 2500# ANSIASME B16.5, B16.47 Series A & B Fuel and water pipe line
Being a stockist we offer UNS N08904 socket weld and threaded flanges with various face like FF, RF, RTJ, Lap Joint, T&G etc.
SS 904L flanges types

SS 904L blind flange

SS 904L blind flanges

  • Class: 150# to 2500#
  • ASTM standard: ASTM A182

UNS N08904 plate flange

UNS N08904 plate flanges

  • Pressure: PN6 to PN64
  • Sizes: 1/2 to 60 inch NB

AISI 904L weld neck flange

AISI 904L weld neck flanges

  • Density:
    7.95 g/cm3
  • Melting Point:
    (2460 °F) 1350 °C

A182 f904L threaded flanges

A182 f904L threaded flanges

  • Standard: ANSI B16.5, ANSI B16.47, B16.48
  • BS4504, BS 10, EN-1092

SUS 904L socket weld flange

SUS 904L socket weld flanges

  • Face type: Ring Type Joint (RTJ)
  • Raised Face (RF), Flat Face (FF)

DIN 1.4539 reducing flanges

DIN 1.4539 reducing flanges

  • Production technique: Forged
  • Heat treated and machined
Dimensions of UNS N08904 blind flanges
NPS For (Normal Pipe Sizes) in Inch Wall Thk Of (B) Outside Dia Of (O.D.)
(A)		 Dia Of Raised Face
(C)		 # flanges Bolts
Holes		 (D)
(B.C.D.)		 Approx.
Weight In (Kilogram)		 Dia Of Bolt Holes
1/2 7/16 3-1/2 1-3/8 4 2-3/8 2 5/8
3/4 1/2 3-7/8 1-11/16 4 2-3/4 2 5/8
1 9/16 4-1/4 2 4 3-1/8 2 5/8
1-1/4 5/8 4-5/8 2-1/2 4 3-1/2 3 5/8
1-1/2 11/16 5 2-7/8 4 3-7/8 3 5/8
2 3/4 6 3-5/8 4 4-3/4 4 3/4
2-1/2 7/8 7 4-1/8 4 5-1/2 7 3/4
3 15/16 7-1/2 5 4 6 9 3/4
3-1/2 15/16 8-1/2 5-1/2 8 7 13 3/4
4 15/16 9 6-3/16 8 7-1/2 17 3/4
5 15/16 10 7-5/16 8 8-1/2 20 7/8
6 1 11 8-1/2 8 9-1/2 27 7/8
8 1-1/8 13-1/2 10-5/8 8 11-3/4 47 7/8
10 1-3/16 16 12-3/4 12 14-1/4 67 1
12 1-1/4 19 15 12 17 123 1
14 1-3/8 21 16-1/4 12 18-3/4 139 1-1/8
16 1-7/16 23-1/2 18-1/2 16 21-1/4 187 1-1/8
18 1-9/16 25 21 16 22-3/4 217 1-1/4
20 1-11/16 27-1/2 23 20 25 283 1-1/4
24 1-7/8 32 27-1/4 20 29-1/2 415 1-3/8
Our stainless steel 904L flanges stocklist
flanges Class and Schedule flanges Size Range Type Of Connection Maximum Pressure
ASME B16.5 Class 300 1/2″ Slip On 720 psi
ASME B16.5 Class 150 1/2″ Socket Weld 275 psi
ASME B16.5 Class 300 1/2″ Slip On 720 psi
ASME B16.5 Class 150 3/4″ FNPT 150 psi
ASME B16.5 Class 300 4″ Slip On 720 psi
ASME B16.5 Class 150 1/2″ Welded 150 psi
ASME B16.5 Class 300 1″ Slip On 720 psi
ASME B16.5 Class 150 1/2″ FNPT 150 psi
ASME B16.5 Class 300 1-1/4″ FNPT 720 psi
ASME B16.5 Class 150 3/4″ Socket Weld 275 psi
ASME B16.5 Class 300 1″ Slip On 720 psi
ASME B16.5 Class 150 1-1/4″ Socket Weld 275 psi
ASME B16.5 Class 300 1-1/4″ Slip On 720 psi
ASME B16.5 Class 150 2″ FNPT 150 psi
ASME B16.5 Class 300 1-1/2″ Slip On 720 psi
ASME B16.5 Class 150 1-1/2″ Socket Weld 275 psi
ASME B16.5 Class 300 2″ Slip On 720 psi
ASME B16.5 Class 150 2″ Socket Weld 275 psi
ASME B16.5 Class 300 1-1/2″ Slip On 720 psi
ASME B16.5 Class 300 2″ Slip On 720 psi
ASME B16.5 Class 150 3″ Socket Weld 275 psi
ASME B16.5 Class 300 2-1/2″ Slip On 720 psi
ASME B16.5 Class 150 2-1/2″ Socket Weld 275 psi
ASME B16.5 Class 300 2-1/2″ Slip On 720 psi
ASME B16.5 Class 150 4″ Socket Weld 275 psi
ASME B16.5 Class 300 3″ Slip On 720 psi
ASME B16.5 Class 150 4″ FNPT 150 psi
ASME B16.5 Class 300 3″ Slip On 720 psi
ASME B16.5 Class 300 4″ Slip On 720 psi
SA 182 904L plate flanges standards
American National Standards Institute
  • ANSI 600
  • ANSI 150
  • ANSI 125
  • ANSI 300
  • ANSI 1500
  • ANSI 900
Australian Standard

AS2129
  • Table G
  • Table D
  • Table E
  • Table F
  • Table J
  • Table H
  • Table C
British Standard

BS10
  • Table H
  • Table K
  • Table F
  • Table D
  • Table G
  • Table E
  • Table J
British Standard

BS4504
  • BS4504-25
  • BS4504-10
  • BS4504-6
  • BS4504-100
  • BS4504-16
  • BS4504-64
  • BS4504-40
  • PN25
  • PN64
  • PN16
  • PN40
  • PN6
  • PN100
  • PN10
Pressure ratings of SUS 904L socket weld flanges
metric unit
Temperature. °C 300 150 400 600 1500 900 2500
−29~38 51.7 20.0 68.9 103.4 258.6 155.1 430.9
50 51.7 19.5 68.9 103.4 258.6 155.1 430.9
100 51.5 17.7 68.7 103.0 257.6 154.6 429.4
150 50.3 15.8 66.8 100.3 250.8 150.6 418.2
200 48.3 13.8 64.5 96.7 241.7 145.0 402.8
250 46.3 12.1 61.7 92.7 231.8 139.0 386.2
300 42.9 10.2 57.0 85.7 214.4 128.6 357.1
325 41.4 9.3 55.0 82.6 206.6 124.0 344.3
350 40.3 8.4 53.6 80.4 201.1 120.7 335.3
375 38.9 7.4 51.6 77.6 194.1 116.5 323.2
400 36.5 6.5 48.9 73.3 183.1 109.8 304.9
425 35.2 5.5 46.5 70.0 175.1 105.1 291.6
Customary Unit
Temperature. °F 300 150 600 400 1500 900 2500
-20~100 750 290 1500 1000 3750 2250 6250
200 750 260 1500 1000 3750 2250 6250
300 730 230 1455 970 3640 2185 6070
400 700 200 1395 930 3490 2095 5820
500 665 170 1330 885 3325 1995 5540
600 605 145 1210 805 3025 1815 5040
650 590 125 1175 785 2940 1765 4905
700 570 110 1135 755 2840 1705 4730
750 530 95 1065 710 2660 1595 4430
800 510 80 1015 675 2540 1525 4230
DIN 1.4539 reducing flanges torque chart
Size in mm Size in Inches Imperfections Maximum. Radial Projection
Deeper Than the Bottom of the Serrations, mm No Deeper Than the Bottom of the Serrations, mm
20 3/4 1.5 3.0
15 1/2 1.5 3.0
25 1 1.5 3.0
40 1 1/2 1.5 3.0
32 1 1/4 1.5 3.0
50 2 1.5 3.0
80 3 1.5 4.5
65 2 1/2 1.5 3.0
90 3 1/2 3.0 6.0
125 5 3.0 6.0
100 4 3.0 6.0
150 6 3.0 6.0
250 10 4.5 8.0
200 8 4.5 8.0
300 12 4.5 8.0
500 20 6.0 12.0
400 16 4.5 10.0
350 14 4.5 8.0
450 18 6.0 12.0
600 24 6.0 12.0
Weight chart of A182 F904L threaded flanges
Standards Dia Class Bolt Circle Dia Bolt Sizes No of Bolts Dia of Bolt Hole
AS4087 95 PN14 67 M12 4 14
ANSI B16.5 89 ANSI 150 60 13 4 16
95 ANSI 300 67 13 4 16
95 ANSI 600 67 13 4 16
121 ANSI 900 83 19 4 22
121 ANSI 1500 83 19 4 22
AS 2129 95 Table C 67 13 4 14
95 Table D 67 13 4 14
95 Table E 67 13 4 14
95 Table F 67 13 4 14
114 Table H 83 16 4 17
114 Table J 83 16 4 17
ISO 7005 (DIN) 80 PN6 55 M10 4 11
95 PN10 65 M12 4 14
95 PN16 65 M12 4 14
90 PN20 60.5 M14 4 16
95 PN25 65 M12 4 14
95 PN40 65 M12 4 14
Physical properties of SS 904L lap joint flanges
Grade (GPa) Elastic Modulus Density
(kg/m3)		 Thermal Expansion Mean Co-eff (µm/m/°C) 0-100°C Specific Heat
(J/kg.K)		 (W/m.K)
Thermal Conductivity		 (nΩ.m)
Elec Resistivity
0-315°C 0-100°C 0-538°C At 500°C At 20°C
Stainless Steel 904L 190 7900 – 15 – 500 – 11.5 952
Thickness tolerance of AISI 904L weld neck flanges
SS 904L Weld Neck flanges Tolerance
D Inside Diameter (ID)
  • 12″ thru 18″: +1/8″
  • 10″ and smaller: ±1/32″
  • 20″ and larger: -1/16″
A OD
  • When OD is over 24″: ±1/8″
  • When OD is 24″ or less: ±1/16″
C Thickness
  • 20″ and larger: ±3/16″, -0″
  • 18″ and smaller: ±1/8″, -0″
J hub at base Diameter
  • When hub base is over 24″: ±1/8″
  • When hub base is 24″ or smaller: ±1/16″
B contact face Diameter
  • 1/4″ T/G (Tongue & Groove), RF (Raised Face), (male & female), (m/f): ±1/64″
  • 1/16″ raised face: ±1/32″
P Drilling
  • Bolts hole spacing: ±1/32″
  • Circle Bolts: ±1/16″
with respect to facing eccentricity of bolt circle
  • 3″ and larger ±1/16″ max
  • 2 1/2″ and smaller ±1/32″ max
H at point of welding diameter of hub
  • 6″ and larger: +5/32″ , -1/32
  • 5″ and smaller: +3/32″ , -1/32″
K hub length
  • 12″ and larger: ±1/8″
  • 10″ and smaller: ±1/16″
We are always here to supply DIN 1.4539 reducing and lapped joint flanges to complete your project successfully, call for latest price list
ASTM A182 F904L slip on flanges chemical composition
Grade Mn C Si S Cr P Mo Ni Cu
Stainless Steel 904L 2.00 max 0.020 max 1.00 max 0.030 max 19.00 – 23.00 0.040 max 4.00 – 5.00 max 23.00 – 28.00 1.00 – 2.00
SS 904L blind flanges mechanical properties
Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
7.95 g/cm3 1350 °C (2460 °F) Psi – 71000 , MPa – 490 Psi – 32000 , MPa – 220 35 %
SA 182 904L plate flanges equivalent
Grade Euronorm UNS No Old British Japanese JIS Swedish SS
No Name BS En
Stainless Steel 904L 1.4539 – N08904 904S13 X1NiCrMoCu25-20-5 SUS 890L –
Can you explain the advantages of using fusion-bonded epoxy (FBE) coatings on SS 904L blind flanges ?

Blind flanges built from this material operate in pharmaceuticals, chemical processing, and allied sectors. An SS 904L blind flanges is advantageous for inspection and maintenance. An FBE coating (or fusion-bonded epoxy) is a thermoset-polymer protective coating that helps flanges to weather corrosive environments with little distortion.

  • Ideal for higher temperatures
  • It ups the overall service lifetime.
  • It boasts resistance to cathodic disbondment (adhesion breakdown). It is a huge competitive advantage over alternatives.
  • The bond strength is also very high
How does the size of a SA 182 904L plate flanges affect its weight and handling?

Customers can purchase these flanges in numerous dimensions, but the industry-standard sizing of an SA 182 904L plate flanges is 1/8 to 36 inches. The nominal pipe diameter, bolt circle, number of holes, and inner and outer diameters – all these metrics influence the flanges weight.

As a practice, manufacturers state the weight in kilograms or pounds in their weight charts. Heavier flanges will impact handling and raise the cost. Project engineers should assess their flanges requirements considering different wall thicknesses.

Are there specific ASTM standards that govern the testing of AISI 904L weld neck flanges?

These flanges serve critical applications with élan, including high pressure, steep temperatures, and fluctuations. An AISI 904L weld neck flanges adheres to the ASTM A182 standards. The testing on these products includes magnetic particle inspection (MPI) and dye penetrant testing. Radiographic and ultrasonic testing can also be conducted.

The specification (ASTM A182) mentions that additional or specific testing and inspections apply only when the buyer explicitly necessitates them. Clients can go with a SUS 904L socket weld flanges for smaller-diameter pipelines. But a word of caution: it exhibits comparatively lower integrity.

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