Designed to satisfy the needs of highly corrosive and high-temperature situations, Amardeep Steel Center stands out as a consistent producer, supplier, and worldwide exporter of Stainless Steel 904L Flanges. Made from 904L grade stainless steel, a super-austenitic alloy enhanced with high amounts of nickel (23–28%), and chromium (19–23%), these flanges also include 4–5% molybdenum and 1–2% copper. Strong acids, seawater, and environments high in chloride-rich environments—among other corrosive media—this composition offers extraordinary resistance.
Low carbon content (Max 0.02%), SS 904L flanges limit the risk of carbide precipitation during welding and provide outstanding weldability. Their special chemical composition guarantees exceptional resistance against pitting, crevice corrosion, intergranular corrosion, and stress corrosion cracking, hence they are a recommended alternative for sectors running demanding chemical environments.
Types of Stainless Steel 904L Flanges We Offer
At Amardeep Steel, we provide a whole selection of SS 904L flanges, each designed to satisfy particular industrial needs depending on use, pressure, and connection requirements:
- 904L blind flanges :
Blind flanges are used for inspection, maintenance, or total system shutdown—designed to close the end of a pipe system. High-pressure systems would find them perfect because of their great strength and sealing capacity. - SS 904L Slip-On Flanges UNS N089 :
For low-pressure uses, these flanges are reasonably priced since they are easy to position, weld, and install. Designed for systems needing regular flange replacement. - 904L Weld Neck Flanges :
With a large tapered hub, these flanges—which are perfect for high-pressure and high-temperature uses—are Reducing stress concentration at the base of the flange, the weld neck design provides structural stability. - Flanges in sockets welds :
Particularly in power generating, oil and gas, and petrochemical sectors, best suited for small-diameter piping systems is Strong, leak-proof weld made possible by these flanges can manage tremendous pressure. - Lap Joint Flanges (SA 182 F904L) :
Commonly utilized in systems needing regular disassembly, inspection, or cleaning, lap joint flanges (SA 182 F904L) When combined with stub ends, these extremely flexible and reasonably priced flanges are quite handy. - Big Diameter Flanges (1.4539,erkstoff nr.):
Specifically made for big-scale, heavy-duty industrial pipes as well as tanks and vessels. Under very demanding running circumstances, they guarantee longevity and corrosion resistance.
Chemical Composition of Stainless Steel 904L Flanges
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
|---|---|---|---|---|---|---|---|---|---|
| SS 904L | 0.08 max | 2 max | 0.75 max | 0.045 max | 0.030 max | 18 – 20 | – | 8 – 11 | – |
This composition gives SS 904L its excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in aggressive environments such as acidic or chloride-rich conditions. The high nickel content enhances its resistance to oxidation, while molybdenum improves its resistance to sulfuric acid and chloride stress corrosion cracking.
SS 904L Flanges Specifications
Specifications List
ASTM A182 / ASME SA182
Class / Pressure Rating
150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Size Chart
1/2″ (15 NB) to 48″ (1200NB)
ASTM Standards
ANSI/ASME B16.5, B16.48, BS4504, B 16.47 Series A & B, BS 10, EN-1092, DIN, etc.
Standard Flange
ANSI, ASME, BS, DIN, EN etc.
| Specifications List | ASTM A182 / ASME SA182 |
|---|---|
| Class / Pressure Rating | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Size Chart | 1/2″ (15 NB) to 48″ (1200NB) |
| ASTM Standards |
ANSI/ASME B16.5, B16.48, BS4504, B 16.47 Series A & B, BS 10, EN-1092, DIN, etc. |
| Standard Flange | ANSI, ASME, BS, DIN, EN etc. |
Every SS 904L flange is inspected and certified to guarantee worldwide quality criteria are followed. To fit even the most exacting designs, we promise accurate machining, strict dimensional tolerances, and exceptional surface finishing.
904L SS Flanges Physical Properties
Density
0.287 lbs/in3
7.95 g/cm3
Specific Heat
0.11 BTU/lb-°F (32 – 212°F)
450 J/kg-°K (0 – 100°C)
Modulus of Elasticity
28.0 x 106 psi
190 GPa
Thermal Conductivity 212°F (100°C)
6.8 BTU/Ft-hr°F
12.9 W/m-°K
Melting Range
2372 – 2534°F
1300 – 1390°C
Electrical Resistivity
33.5 Microhm-in at 68°C
95.2 Microhm-cm at 20°C
904L Stainless Steel Flanges Equrades
STANDARD
UNS
WNR.
JIS
BS
KS
AFNOR
EN
SS 904L
N08904
1.4539
SUS 904L
904S13
STS 317J5L
Z2 NCDU 25-20
X1NiCrMoCu25-20-5
SS 904L Pla Size
Nominal Pipe Size
Outside Diameter of Flange
Thickness of Flange
Diameter of Raised Face
Diameter of Hub at Base
Length Thru Hub
Diameter or Bore
Diameter of Hub at Bevel
Radius of Fillet
Depth of Socket
Welding Neck
Slip-On Threaded Socket
Lap Joint
Slip-on Socket
Lap Joint
O
Q
R
X
Y
Y
Y
W
B
H
r
Z
1/2
3-1/2
7/16
1-3/8
1-3/16
1-7/8
5/8
5/8
.88
.90
.84
1/8
3/8
3/4
3-7/8
1/2
1-11/16
1-1/2
2-1/16
5/8
5/8
1.09
1.11
1.05
1/8
7/16
1
4-1/4
9/16
2
1-15/16
2-3/16
11/16
11/16
1.36
1.38
1.32
1/8
1/2
1-1/4
4-5/8
5/8
2-1/2
2-5/16
2-1/4
13/16
13/16
1.70
1.72
1.66
3/16
9/16
1-1/2
5
11/16
2-7/8
2-9/16
2-7/16
7/8
7/8
1.95
1.97
1.90
1/4
5/8
2
6
3/4
3-5/8
3-1/16
2-1/2
1
1
2.44
2.46
2.38
5/16
11/16
2-1/2
7
7/8
4-1/8
3-9/16
2-3/4
1-1/8
1-1/8
2.94
2.97
2.88
5/16
3/4
3
7-1/2
15/16
5
4-1/4
2-3/4
1-3/16
1-3/16
3.57
3.60
3.50
3/8
13/16
3-1/2
8-1/2
15/16
5-1/2
4-13/16
2-13/16
1-1/4
1-1/4
4.07
4.10
4.00
3/8
7/8
4
9
15/16
6-3/16
5-5/16
3
1-5/16
1-5/16
4.57
4.60
4.50
7/16
15/16
5
10
15/16
7.5/16
6-7/16
3-1/2
1-7/16
1-7/16
5.66
5.69
5.56
7/16
15/16
6
11
1
8-1/2
7-9/16
3-1/2
1-9/16
1-9/16
6.72
6.75
6.63
1/2
1-1/16
8
13-1/2
1-1/8
10-5/8
9-11/16
4
1-3/4
1-3/4
8.72
8.75
8.63
1/2
1-1/4
10
16
1-3/16
12-3/4
12
4
1-15/16
1-15/16
10.88
10.92
10.75
1/2
1-5/16
12
19
1-1/4
15
14-3/8
4-1/2
2-3/16
2-3/16
12.88
12.92
12.75
1/2
1-9/16
14
21
1-3/8
16-1/4
15-3/4
5
2-1/4
3-1/8
14.14
14.18
14.00
1/2
1-5/8
16
23-1/2
1-7/16
18-1/2
18
5
2-1/2
3-7/16
16.16
16.19
16.00
1/2
1-3/4
18
25
1-9/16
21
19-7/8
5-1/2
2-11/16
3-13/16
18.18
18.20
18.00
1/2
1-15/16
20
27-1/2
1-11/16
23
22
5-11/16
2-7/8
4-1/16
20.20
20.25
20.00
1/2
2-1/8
24
32
1-7/8
27-1/4
26-1/8
6
3-1/4
4-3/8
24.25
24.25
24.00
1/2
2-1/2
Stainless Steel 904L Flanges Dimensions
Normal Pipe Size (NPS)
Outside Daimeter (O.D.) Of Flange
Thickness Of Flanges
Diameter of Raised Face
Hub at Base Diameter
Lengtd Tdru Hub
Bore And Diameter
Hub at Bevel Diameter
Radius of Fillet
Socket Deptd
Weld Neck (WN)
SORF (Slip-On) NPT (Threaded) SWRF (Socket)
Loose (Lap Joint)
SORF (Slip-on) SWRF (Socket)
Loose (Lap Joint)
O
Q
R
X
Y
Y
Y
W
B
H
r
Z
1/2
3-1/2
7/16
1-3/8
1-3/16
1-7/8
5/8
5/8
.88
.90
.84
1/8
3/8
3/4
3-7/8
1/2
1-11/16
1-1/2
2-1/16
5/8
5/8
1.09
1.11
1.05
1/8
7/16
1
4-1/4
9/16
2
1-15/16
2-3/16
11/16
11/16
1.36
1.38
1.32
1/8
1/2
1-1/4
4-5/8
5/8
2-1/2
2-5/16
2-1/4
13/16
13/16
1.70
1.72
1.66
3/16
9/16
1-1/2
5
11/16
2-7/8
2-9/16
2-7/16
7/8
7/8
1.95
1.97
1.90
1/4
5/8
2
6
3/4
3-5/8
3-1/16
2-1/2
1
1
2.44
2.46
2.38
5/16
11/16
2-1/2
7
7/8
4-1/8
3-9/16
2-3/4
1-1/8
1-1/8
2.94
2.97
2.88
5/16
3/4
3
7-1/2
15/16
5
4-1/4
2-3/4
1-3/16
1-3/16
3.57
3.60
3.50
3/8
13/16
3-1/2
8-1/2
15/16
5-1/2
4-13/16
2-13/16
1-1/4
1-1/4
4.07
4.10
4.00
3/8
7/8
4
9
15/16
6-3/16
5-5/16
3
1-5/16
1-5/16
4.57
4.60
4.50
7/16
15/16
5
10
15/16
7.5/16
6-7/16
3-1/2
1-7/16
1-7/16
5.66
5.69
5.56
7/16
15/16
6
11
1
8-1/2
7-9/16
3-1/2
1-9/16
1-9/16
6.72
6.75
6.63
1/2
1-1/16
8
13-1/2
1-1/8
10-5/8
9-11/16
4
1-3/4
1-3/4
8.72
8.75
8.63
1/2
1-1/4
10
16
1-3/16
12-3/4
12
4
1-15/16
1-15/16
10.88
10.92
10.75
1/2
1-5/16
12
19
1-1/4
15
14-3/8
4-1/2
2-3/16
2-3/16
12.88
12.92
12.75
1/2
1-9/16
14
21
1-3/8
16-1/4
15-3/4
5
2-1/4
3-1/8
14.14
14.18
14.00
1/2
1-5/8
16
23-1/2
1-7/16
18-1/2
18
5
2-1/2
3-7/16
16.16
16.19
16.00
1/2
1-3/4
18
25
1-9/16
21
19-7/8
5-1/2
2-11/16
3-13/16
18.18
18.20
18.00
1/2
1-15/16
20
27-1/2
1-11/16
23
22
5-11/16
2-7/8
4-1/16
20.20
20.25
20.00
1/2
2-1/8
24
32
1-7/8
27-1/4
26-1/8
6
3-1/4
4-3/8
24.25
24.25
24.00
1/2
2-1/2
SS 904L Flanges Applications
|
Density 0.287 lbs/in37.95 g/cm3 Specific Heat 0.11 BTU/lb-°F (32 – 212°F)450 J/kg-°K (0 – 100°C) Modulus of Elasticity 28.0 x 106 psi190 GPa |
Thermal Conductivity 212°F (100°C) 6.8 BTU/Ft-hr°F12.9 W/m-°K Melting Range 2372 – 2534°F1300 – 1390°C Electrical Resistivity 33.5 Microhm-in at 68°C95.2 Microhm-cm at 20°C |
| STANDARD | UNS | WNR. | JIS | BS | KS | AFNOR | EN |
|---|---|---|---|---|---|---|---|
| SS 904L | N08904 | 1.4539 | SUS 904L | 904S13 | STS 317J5L | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 |
| Nominal Pipe Size | Outside Diameter of Flange | Thickness of Flange | Diameter of Raised Face | Diameter of Hub at Base | Length Thru Hub | Diameter or Bore | Diameter of Hub at Bevel | Radius of Fillet | Depth of Socket | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Welding Neck | Slip-On Threaded Socket | Lap Joint | Slip-on Socket | Lap Joint | ||||||||
| O | Q | R | X | Y | Y | Y | W | B | H | r | Z | |
| 1/2 | 3-1/2 | 7/16 | 1-3/8 | 1-3/16 | 1-7/8 | 5/8 | 5/8 | .88 | .90 | .84 | 1/8 | 3/8 |
| 3/4 | 3-7/8 | 1/2 | 1-11/16 | 1-1/2 | 2-1/16 | 5/8 | 5/8 | 1.09 | 1.11 | 1.05 | 1/8 | 7/16 |
| 1 | 4-1/4 | 9/16 | 2 | 1-15/16 | 2-3/16 | 11/16 | 11/16 | 1.36 | 1.38 | 1.32 | 1/8 | 1/2 |
| 1-1/4 | 4-5/8 | 5/8 | 2-1/2 | 2-5/16 | 2-1/4 | 13/16 | 13/16 | 1.70 | 1.72 | 1.66 | 3/16 | 9/16 |
| 1-1/2 | 5 | 11/16 | 2-7/8 | 2-9/16 | 2-7/16 | 7/8 | 7/8 | 1.95 | 1.97 | 1.90 | 1/4 | 5/8 |
| 2 | 6 | 3/4 | 3-5/8 | 3-1/16 | 2-1/2 | 1 | 1 | 2.44 | 2.46 | 2.38 | 5/16 | 11/16 |
| 2-1/2 | 7 | 7/8 | 4-1/8 | 3-9/16 | 2-3/4 | 1-1/8 | 1-1/8 | 2.94 | 2.97 | 2.88 | 5/16 | 3/4 |
| 3 | 7-1/2 | 15/16 | 5 | 4-1/4 | 2-3/4 | 1-3/16 | 1-3/16 | 3.57 | 3.60 | 3.50 | 3/8 | 13/16 |
| 3-1/2 | 8-1/2 | 15/16 | 5-1/2 | 4-13/16 | 2-13/16 | 1-1/4 | 1-1/4 | 4.07 | 4.10 | 4.00 | 3/8 | 7/8 |
| 4 | 9 | 15/16 | 6-3/16 | 5-5/16 | 3 | 1-5/16 | 1-5/16 | 4.57 | 4.60 | 4.50 | 7/16 | 15/16 |
| 5 | 10 | 15/16 | 7.5/16 | 6-7/16 | 3-1/2 | 1-7/16 | 1-7/16 | 5.66 | 5.69 | 5.56 | 7/16 | 15/16 |
| 6 | 11 | 1 | 8-1/2 | 7-9/16 | 3-1/2 | 1-9/16 | 1-9/16 | 6.72 | 6.75 | 6.63 | 1/2 | 1-1/16 |
| 8 | 13-1/2 | 1-1/8 | 10-5/8 | 9-11/16 | 4 | 1-3/4 | 1-3/4 | 8.72 | 8.75 | 8.63 | 1/2 | 1-1/4 |
| 10 | 16 | 1-3/16 | 12-3/4 | 12 | 4 | 1-15/16 | 1-15/16 | 10.88 | 10.92 | 10.75 | 1/2 | 1-5/16 |
| 12 | 19 | 1-1/4 | 15 | 14-3/8 | 4-1/2 | 2-3/16 | 2-3/16 | 12.88 | 12.92 | 12.75 | 1/2 | 1-9/16 |
| 14 | 21 | 1-3/8 | 16-1/4 | 15-3/4 | 5 | 2-1/4 | 3-1/8 | 14.14 | 14.18 | 14.00 | 1/2 | 1-5/8 |
| 16 | 23-1/2 | 1-7/16 | 18-1/2 | 18 | 5 | 2-1/2 | 3-7/16 | 16.16 | 16.19 | 16.00 | 1/2 | 1-3/4 |
| 18 | 25 | 1-9/16 | 21 | 19-7/8 | 5-1/2 | 2-11/16 | 3-13/16 | 18.18 | 18.20 | 18.00 | 1/2 | 1-15/16 |
| 20 | 27-1/2 | 1-11/16 | 23 | 22 | 5-11/16 | 2-7/8 | 4-1/16 | 20.20 | 20.25 | 20.00 | 1/2 | 2-1/8 |
| 24 | 32 | 1-7/8 | 27-1/4 | 26-1/8 | 6 | 3-1/4 | 4-3/8 | 24.25 | 24.25 | 24.00 | 1/2 | 2-1/2 |
| Normal Pipe Size (NPS) | Outside Daimeter (O.D.) Of Flange | Thickness Of Flanges | Diameter of Raised Face | Hub at Base Diameter | Lengtd Tdru Hub | Bore And Diameter | Hub at Bevel Diameter | Radius of Fillet | Socket Deptd | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weld Neck (WN) | SORF (Slip-On) NPT (Threaded) SWRF (Socket) | Loose (Lap Joint) | SORF (Slip-on) SWRF (Socket) | Loose (Lap Joint) | ||||||||
| O | Q | R | X | Y | Y | Y | W | B | H | r | Z | |
| 1/2 | 3-1/2 | 7/16 | 1-3/8 | 1-3/16 | 1-7/8 | 5/8 | 5/8 | .88 | .90 | .84 | 1/8 | 3/8 |
| 3/4 | 3-7/8 | 1/2 | 1-11/16 | 1-1/2 | 2-1/16 | 5/8 | 5/8 | 1.09 | 1.11 | 1.05 | 1/8 | 7/16 |
| 1 | 4-1/4 | 9/16 | 2 | 1-15/16 | 2-3/16 | 11/16 | 11/16 | 1.36 | 1.38 | 1.32 | 1/8 | 1/2 |
| 1-1/4 | 4-5/8 | 5/8 | 2-1/2 | 2-5/16 | 2-1/4 | 13/16 | 13/16 | 1.70 | 1.72 | 1.66 | 3/16 | 9/16 |
| 1-1/2 | 5 | 11/16 | 2-7/8 | 2-9/16 | 2-7/16 | 7/8 | 7/8 | 1.95 | 1.97 | 1.90 | 1/4 | 5/8 |
| 2 | 6 | 3/4 | 3-5/8 | 3-1/16 | 2-1/2 | 1 | 1 | 2.44 | 2.46 | 2.38 | 5/16 | 11/16 |
| 2-1/2 | 7 | 7/8 | 4-1/8 | 3-9/16 | 2-3/4 | 1-1/8 | 1-1/8 | 2.94 | 2.97 | 2.88 | 5/16 | 3/4 |
| 3 | 7-1/2 | 15/16 | 5 | 4-1/4 | 2-3/4 | 1-3/16 | 1-3/16 | 3.57 | 3.60 | 3.50 | 3/8 | 13/16 |
| 3-1/2 | 8-1/2 | 15/16 | 5-1/2 | 4-13/16 | 2-13/16 | 1-1/4 | 1-1/4 | 4.07 | 4.10 | 4.00 | 3/8 | 7/8 |
| 4 | 9 | 15/16 | 6-3/16 | 5-5/16 | 3 | 1-5/16 | 1-5/16 | 4.57 | 4.60 | 4.50 | 7/16 | 15/16 |
| 5 | 10 | 15/16 | 7.5/16 | 6-7/16 | 3-1/2 | 1-7/16 | 1-7/16 | 5.66 | 5.69 | 5.56 | 7/16 | 15/16 |
| 6 | 11 | 1 | 8-1/2 | 7-9/16 | 3-1/2 | 1-9/16 | 1-9/16 | 6.72 | 6.75 | 6.63 | 1/2 | 1-1/16 |
| 8 | 13-1/2 | 1-1/8 | 10-5/8 | 9-11/16 | 4 | 1-3/4 | 1-3/4 | 8.72 | 8.75 | 8.63 | 1/2 | 1-1/4 |
| 10 | 16 | 1-3/16 | 12-3/4 | 12 | 4 | 1-15/16 | 1-15/16 | 10.88 | 10.92 | 10.75 | 1/2 | 1-5/16 |
| 12 | 19 | 1-1/4 | 15 | 14-3/8 | 4-1/2 | 2-3/16 | 2-3/16 | 12.88 | 12.92 | 12.75 | 1/2 | 1-9/16 |
| 14 | 21 | 1-3/8 | 16-1/4 | 15-3/4 | 5 | 2-1/4 | 3-1/8 | 14.14 | 14.18 | 14.00 | 1/2 | 1-5/8 |
| 16 | 23-1/2 | 1-7/16 | 18-1/2 | 18 | 5 | 2-1/2 | 3-7/16 | 16.16 | 16.19 | 16.00 | 1/2 | 1-3/4 |
| 18 | 25 | 1-9/16 | 21 | 19-7/8 | 5-1/2 | 2-11/16 | 3-13/16 | 18.18 | 18.20 | 18.00 | 1/2 | 1-15/16 |
| 20 | 27-1/2 | 1-11/16 | 23 | 22 | 5-11/16 | 2-7/8 | 4-1/16 | 20.20 | 20.25 | 20.00 | 1/2 | 2-1/8 |
| 24 | 32 | 1-7/8 | 27-1/4 | 26-1/8 | 6 | 3-1/4 | 4-3/8 | 24.25 | 24.25 | 24.00 | 1/2 | 2-1/2 |
Stainless Steel 904L flanges are widely utilised across sectors like Chemical & Petrochemical Plants - For handling corrosive chemicals and acids because of their higher corrosion resistance, robustness, and dependability.
- Marine and offshore applications: remarkable resistance to salinine and seawater surroundings.
- Oil & Gas Refineries: For pipes running high pressure aggressive fluids and gases.
- Ideal for steam, boiler, and heat transfer systems, power generation and heat exchangers
- Suitable for procedures involving acidic bleaching chemicals is the pulp and paper industry.
These flanges guarantee safety, performance stability, and low maintenance in offshore and onshore projects.
Global Exporter of SS 904L Flanges
Having more than thirty years of expertise, Amardeep Steel has become a reliable global SS 904L flange exporter serving more than ninety countries around. Major players from USA, Germany, Italy, UAE, Saudi Arabia, Mexico, Brazil, Indonesia, Poland, Chile, Qatar, South Africa, Canada, Australia, the UK, and many more abound in our worldwide clientele. Amardeep Steel is a favoured export partner over continents since our flanges are well known for their accuracy, performance, and corrosion resistance.
Why Choose Amardeep Steel for 904L Stainless Steel Pipes & Flanges?
More than 35 years of expertise producing stainless steel
- ISO-certified buildings subjecting strict quality control
- Open and competitive SS 904L price policy
- Quick delivery with choices for custom size.
- Ideal supplier for worldwide industries, fabricators, and EPC contractors
At Amardeep Steel, we combine client-oriented services, technical knowledge, and modern manufacturing to provide the best Stainless Steel 904L flanges catered to your particular needs.
FAQs
1. What is the 904L material grade?
This grade is written as 1.4539 or X1NiCrMoCu25-20-5 according to EN norm and it is written as UNS S08904 according to UNS norm. 904L stainless grade contains very high levels of nickel, molybdenum, chromium, and combinations of all these elements making this stainless steel grade very resistant to corrosion resistance.
2. Where is 904L steel used?
It has applications in piping systems, pollution control equipment, heat exchangers, and bleaching systems.
3. What is the chemical compatibility of 904L?
The addition of copper to this grade gives it corrosion-resistant properties superior to the conventional chrome nickel stainless steels, in particular to sulphuric, phosphoric, and acetic acids. However, there is limited use of hydrochloric acids.
