ASTM A182 F304L Stainless Steel Flanges are forged pipe fittings used to connect pipes, valves, and equipment in industrial piping systems handling liquids, gases, and steam. The low-carbon SS 304L grade (max 0.03% C) offers excellent corrosion resistance and superior weldability by preventing carbide precipitation during welding. They are constructed using low-carbon stainless steel grade 304L that is highly resistant to corrosion and durability in application, particularly in conditions that are subjected to mild acids and chemicals. These flanges are also offering excellent cryogenic properties such that they are also strong and stable at extremely low temperatures. SS 304L flanges are available in a great variety of different sizes and types, including slip-on, weld neck, and blind flanges, which ensure easy installation and good performance of the system. Amardeep Steel is a reliable manufacturer and provider, dealing with high quality Stainless Steel 304L flanges, which can be used in different industrial needs and requirements as per the international standards.
Specification of Stainless Steel 304L Flanges
| Category | Specification Details |
|---|---|
| Material Specifications | ASTM A182 / ASME SA182 |
| Standard Designations | ANSI, ASME, BS, DIN, EN, etc. |
| Dimensional Standards | ANSI/ASME B16.5, B16.47 (Series A & B), B16.48, BS4504, BS 10, EN-1092, DIN |
| Size Range | 1/2″ (15 NB) to 48″ (1200 NB) |
| Pressure Ratings (Class) | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Pressure Ratings (PN) | PN6, PN10, PN16, PN25, PN40, PN64, etc. |
Chemical Composition of SS 304L Flanges
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
|---|---|---|---|---|---|---|---|---|---|
| SS 304L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.03 max | 18.0 – 20.0 | — | 8.0 – 13.0 | — |
DIN 1.4306 SS 304L Flanges Mechanical Properties
| Property | Value (Metric) | Value (Imperial) |
|---|---|---|
| Density | 8.0 g/cm³ | 0.289 lb/in³ |
| Melting Point | 1400 °C | 2550 °F |
| Tensile Strength | 515 MPa | 75,000 Psi |
| Yield Strength (0.2% Offset) | 205 MPa | 30,000 Psi |
| Elongation | 35% | 35% |
Physical Properties of Stainless Steel 304L Flanges
| Grade | Density (lbm/in³) at 68°F | Thermal Conductivity (BTU/h⋅ft⋅°F) at 212°F | Thermal Conductivity (BTU/h⋅ft⋅°F) at 932°F | Electrical Resistivity (in×10−6) at 68°F | Electrical Resistivity (in×10−6) at 752°F | Electrical Resistivity (in×10−6) at 1652°F | Elastic Modulus (psi×10&sup6;) | Coeff. of Thermal Expansion (in/in/°F×10−6) 32−212°F | Coeff. of Thermal Expansion (in/in/°F×10−6) 32−1000°F | Coeff. of Thermal Expansion (in/in/°F×10−6) 32−1500°F | Specific Heat (BTU/lb/°F) 68−212°F | Melting Range (°F) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SS 304L | 0.285 | 9.4 | 12.4 | 28.3 | 39.4 | 49.6 | 28.0 | 9.4 | 10.2 | 10.4 | 0.12 | 2500 – 2590 |
Equivalent Grades of Stainless Steel 304L (DIN 1.4307) Pipe Flanges
| Grade | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
|---|---|---|---|---|---|---|---|
| SS 304L | 1.4307 | S30403 | SUS 304L | 304S11 | 03Х18Н11 | Z3CN18‑10 | X2CrNi18-9 / X2CrNi19-11 |
HSN Code of SS 304L Flanges
| Description | HSN Code |
|---|---|
| SS 304L Flanges | 73072100 |
Types of SS 304L Flanges
PN 16, ASME SA182 F304L Plate Flanges, DN 125
3 In, Class 300, SS Orifice Flanges, A182 304L, SCH 40
AWWA Class D, ASTM A182 304L Puddle Flanges, 28 Inch
RF, Dual Rated ASTM A182 304L Blind Flanges, 150LB
ANSI 304L Flat Flanges, DIN2501, DN50, PN16
Class 300, ASTM A182 F304L SW Flanges, SCH 40, 1 Inch, RF Ends
12 Inch, ASTM A182 F304L Stainless Steel WN Flanges, Class150, RF
12 Inch, ASTM A182 F304L SO Flanges, Class D, STD Bore
Forged, A182 F304L, Stainless Steel Blind Flanges, 150LB
1 Inch, ASTM A182 F304L Lapped Joint Flange, ANSI B16.5
ASTM A182 F304L, Spade and Spacer Blind Flanges, DN50, PN50
SS A182 F304L Blind Flange, ANSI B16.47A, 40 Inch
Stainless Steel 304L Flanges
SS 304L Flange Size Chart (ASME B16.5 Class 150)
|
NPS |
OD (O) |
Thk (Q) |
RF (R) |
Hub Base (X) |
Length Thru Hub (Y) |
Bore (B) |
Hub Bevel (W) |
Fillet (r) |
Socket Depth |
|
1/2 |
3-1/2 |
7/16 |
1-3/8 |
1-3/16 |
1-7/8 (WN) |
0.62 (SO) |
0.84 |
1/8 |
3/8 |
|
3/4 |
3-7/8 |
1/2 |
1-11/16 |
1-1/2 |
2-1/16 (WN) |
0.82 (SO) |
1.05 |
1/8 |
7/16 |
|
1 |
4-1/4 |
9/16 |
2 |
1-15/16 |
2-3/16 (WN) |
1.05 (SO) |
1.32 |
1/8 |
1/2 |
|
1-1/4 |
4-5/8 |
5/8 |
2-1/2 |
2-5/16 |
2-1/4 (WN) |
1.38 (SO) |
1.66 |
3/16 |
9/16 |
|
1-1/2 |
5 |
11/16 |
2-7/8 |
2-9/16 |
2-7/16 (WN) |
1.61 (SO) |
1.90 |
1/4 |
5/8 |
|
2 |
6 |
3/4 |
3-5/8 |
3-1/16 |
2-1/2 (WN) |
2.07 (SO) |
2.38 |
5/16 |
11/16 |
|
2-1/2 |
7 |
7/8 |
4-1/8 |
3-9/16 |
2-3/4 (WN) |
2.47 (SO) |
2.88 |
5/16 |
3/4 |
|
3 |
7-1/2 |
15/16 |
5 |
4-1/4 |
2-3/4 (WN) |
3.07 (SO) |
3.50 |
3/8 |
13/16 |
|
3-1/2 |
8-1/2 |
15/16 |
5-1/2 |
4-13/16 |
2-13/16 (WN) |
3.55 (SO) |
4.00 |
3/8 |
7/8 |
|
4 |
9 |
15/16 |
6-3/16 |
5-5/16 |
3 (WN) |
4.03 (SO) |
4.50 |
7/16 |
15/16 |
|
5 |
10 |
15/16 |
7-5/16 |
6-7/16 |
3-1/2 (WN) |
5.05 (SO) |
5.56 |
7/16 |
15/16 |
|
6 |
11 |
1 |
8-1/2 |
7-9/16 |
3-1/2 (WN) |
6.07 (SO) |
6.63 |
1/2 |
1-1/16 |
|
8 |
13-1/2 |
1-1/8 |
10-5/8 |
9-11/16 |
4 (WN) |
8.07 (SO) |
8.63 |
1/2 |
1-1/4 |
|
10 |
16 |
1-3/16 |
12-3/4 |
12 |
4 (WN) |
10.02 (SO) |
10.75 |
1/2 |
1-5/16 |
|
12 |
19 |
1-1/4 |
15 |
14-3/8 |
4-1/2 (WN) |
12.02 (SO) |
12.75 |
1/2 |
1-9/16 |
|
14 |
21 |
1-3/8 |
16-1/4 |
15-3/4 |
5 (WN) |
14.02 (SO) |
14.00 |
1/2 |
1-5/8 |
|
16 |
23-1/2 |
1-7/16 |
18-1/2 |
18 |
5 (WN) |
16.02 (SO) |
16.00 |
1/2 |
1-3/4 |
|
18 |
25 |
1-9/16 |
21 |
19-7/8 |
5-1/2 (WN) |
18.02 (SO) |
18.00 |
1/2 |
1-15/16 |
|
20 |
27-1/2 |
1-11/16 |
23 |
22 |
5-11/16 (WN) |
20.02 (SO) |
20.00 |
1/2 |
2-1/8 |
|
24 |
32 |
1-7/8 |
27-1/4 |
26-1/8 |
6-1/4 (WN) |
24.02 (SO) |
24.00 |
1/2 |
2-1/2 |
ANSI B16.5 SS 304L Weight Chart
| Pipe Size (NPS) | DN | OD Flange (O) | Thk (C) | Hub Dia (X) | RF Dia (G) | Hub Length (Y) | Thread Len (T) | Bolt Circle (BC) | Hole Dia (BH) | Bolt Qty | Bolt Size | Weight (KG) | Weight (LB) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | 15 | 89.00 | 11.20 | 30.20 | 35.10 | 15.70 | 15.70 | 60.50 | 15.80 | 4 | 1/2″ | 0.4 | 0.9 |
| 3/4″ | 20 | 98.50 | 12.70 | 38.10 | 42.90 | 15.70 | 15.70 | 69.90 | 15.80 | 4 | 1/2″ | 0.7 | 1.5 |
| 1″ | 25 | 108.00 | 14.20 | 49.30 | 50.80 | 17.50 | 17.50 | 79.30 | 15.80 | 4 | 1/2″ | 0.8 | 1.8 |
| 1-1/4″ | 32 | 117.50 | 15.70 | 58.70 | 63.50 | 20.60 | 20.60 | 88.90 | 15.80 | 4 | 1/2″ | 1.2 | 2.6 |
| 1-1/2″ | 40 | 127.00 | 17.50 | 65.00 | 73.20 | 22.40 | 22.40 | 98.60 | 15.80 | 4 | 1/2″ | 1.5 | 3.3 |
| 2″ | 50 | 152.50 | 19.10 | 77.70 | 91.90 | 25.40 | 25.40 | 120.70 | 19.10 | 4 | 5/8″ | 2.3 | 5.1 |
| 2-1/2″ | 65 | 178.00 | 22.40 | 90.40 | 104.60 | 28.40 | 28.40 | 139.70 | 19.10 | 4 | 5/8″ | 3.7 | 8.1 |
| 3″ | 80 | 190.50 | 23.90 | 108.00 | 127.00 | 30.20 | 30.20 | 152.40 | 19.10 | 4 | 5/8″ | 4.1 | 9.0 |
| 3-1/2″ | 90 | 216.00 | 23.90 | 122.20 | 139.70 | 31.80 | 31.80 | 177.80 | 19.10 | 8 | 5/8″ | 5.1 | 11.2 |
| 4″ | 100 | 228.50 | 23.90 | 134.90 | 157.20 | 33.30 | 33.30 | 190.50 | 19.10 | 8 | 5/8″ | 5.9 | 13.0 |
| 5″ | 125 | 254.00 | 23.90 | 163.60 | 185.70 | 36.60 | 36.60 | 215.90 | 22.40 | 8 | 3/4″ | 7.0 | 15.4 |
| 6″ | 150 | 279.50 | 25.40 | 192.00 | 215.90 | 39.60 | 39.60 | 241.30 | 22.40 | 8 | 3/4″ | 8.4 | 18.5 |
| 8″ | 200 | 343.00 | 28.40 | 246.10 | 269.70 | 44.50 | 44.50 | 298.50 | 22.40 | 8 | 3/4″ | 13.0 | 28.6 |
| 10″ | 250 | 406.50 | 30.20 | 304.80 | 323.90 | 49.30 | 49.30 | 362.00 | 25.40 | 12 | 7/8″ | 18.0 | 39.5 |
| 12″ | 300 | 482.50 | 31.80 | 365.30 | 381.00 | 55.60 | 55.60 | 431.80 | 25.40 | 12 | 7/8″ | 29.0 | 64.0 |
| 14″ | 350 | 533.50 | 35.10 | 400.10 | 412.80 | 57.20 | 57.20 | 476.30 | 28.50 | 12 | 1″ | 39.0 | 86.0 |
| 16″ | 400 | 597.00 | 36.60 | 457.20 | 469.90 | 63.50 | 63.50 | 539.80 | 28.50 | 16 | 1″ | 47.0 | 103.0 |
| 18″ | 450 | 635.00 | 39.60 | 505.00 | 533.40 | 68.30 | 68.30 | 577.90 | 31.80 | 16 | 1-1/8″ | 57.0 | 126.0 |
| 20″ | 500 | 698.50 | 42.90 | 558.80 | 584.20 | 73.20 | 73.20 | 635.00 | 31.80 | 20 | 1-1/8″ | 76.0 | 167.0 |
| 24″ | 600 | 813.00 | 47.80 | 663.40 | 692.20 | 82.60 | 82.60 | 749.30 | 35.10 | 20 | 1-1/4″ | 97.0 | 214.0 |
Dimension chart of ANSI/ASME B16.5 SS 304L Flanges
| Standard / Class | Diameter (mm) | Bolt Circle (mm) | Number of Bolts | Bolt Size | Bolt Hole Dia. (mm) |
|---|---|---|---|---|---|
| AS4087 PN14 | 95 | 67 | 4 | M12 | 14 |
| AS 2129 (Table C, D, E, F) | 95 | 67 | 4 | 1/2″ (13mm) | 14 |
| AS 2129 (Table H, J) | 114 | 83 | 4 | 5/8″ (16mm) | 17 |
| ANSI 150 | 89 | 60 | 4 | 1/2″ (13mm) | 16 |
| ANSI 300 / 600 | 95 | 67 | 4 | 1/2″ (13mm) | 16 |
| ANSI 900 / 1500 | 121 | 83 | 4 | 3/4″ (19mm) | 22 |
| ISO 7005 (PN6) | 80 | 55 | 4 | M10 | 11 |
| ISO 7005 (PN10 / 16 / 25 / 40) | 95 | 65 | 4 | M12 | 14 |
| ISO 7005 (PN20) | 90 | 60.5 | 4 | M14 | 16 |
SS UNS S30403 Flanges Pressure Rating Chart
| Temp (°F) | 150# | 300# | 400# | 600# | 900# | 1500# | 2500# |
|---|---|---|---|---|---|---|---|
| -20 to 100 | 275 | 720 | 960 | 1440 | 2160 | 3600 | 6000 |
| 200 | 230 | 600 | 800 | 1200 | 1800 | 3000 | 5000 |
| 300 | 205 | 540 | 720 | 1080 | 1620 | 2700 | 4500 |
| 400 | 190 | 495 | 660 | 995 | 1490 | 2485 | 4140 |
| 500 | 170 | 465 | 620 | 930 | 1395 | 2330 | 3880 |
| 600 | 140 | 435 | 580 | 875 | 1310 | 2185 | 3640 |
| 650 | 125 | 430 | 575 | 860 | 1290 | 2150 | 3580 |
| 700 | 110 | 425 | 565 | 850 | 1275 | 2125 | 3540 |
| 750 | 95 | 415 | 555 | 830 | 1245 | 2075 | 3460 |
| 800 | 80 | 405 | 540 | 805 | 1210 | 2015 | 3360 |
| 850 | 65 | 395 | 530 | 790 | 1190 | 1980 | 3300 |
| 900 | 50 | 390 | 520 | 780 | 1165 | 1945 | 3240 |
| 950 | 35 | 380 | 510 | 765 | 1145 | 1910 | 3180 |
| 1000 | 20 | 320 | 430 | 640 | 965 | 1605 | 2675 |
| 1050 | 20 | 310 | 410 | 615 | 925 | 1545 | 2570 |
| 1100 | 20 | 255 | 345 | 515 | 770 | 1285 | 2145 |
| 1150 | 20 | 200 | 265 | 400 | 595 | 995 | 1655 |
| 1200 | 20 | 155 | 205 | 310 | 465 | 770 | 1285 |
| 1250 | 20 | 115 | 150 | 225 | 340 | 565 | 945 |
| 1300 | 20 | 85 | 115 | 170 | 255 | 430 | 715 |
| 1350 | 20 | 60 | 80 | 125 | 185 | 310 | 515 |
| 1400 | 20 | 50 | 65 | 95 | 145 | 240 | 400 |
| 1450 | 15 | 35 | 45 | 70 | 105 | 170 | 285 |
| 1500 | 10 | 25 | 35 | 55 | 80 | 135 | 230 |
Application and Industrial Uses of SS 304L Flanges
- Petroleum Refining
Petroleum refining, and sourvs on petroleum refining. - Power Generation
Power generation, power generatior and power industries. - Industrial Machineries
Industrial machineries, indedctrial Industrial machineries. - Chemical Plants
Chemical plants, refrochmanier, and chemical plants. - Gas & Water Pipe Line
Gas & water pipe line, and moorr cover vector pipelines. - Oil & Gas Exploration
Oil gas exploration, gas, and oil & gas exploration. - Petrochemicals and Refineries
Petrochemicals and refineries, and mater trens. - Thermal, Nuclear, and Solar Power Plants
Thermal, nuclear, and solar power pover plants.
Price List of Stainless Steel 304L Flanges
| Flange Description | Price in India (INR) | Price in UAE (AED) |
|---|---|---|
| A182 F304L Slip On Flange | ₹ 2,480.51 | AED 128.60 |
| A182 F304L Flange (Standard) | ₹ 850.46 | AED 44.09 |
| SS 304L Pipe Flange | ₹ 1,771.79 | AED 91.86 |
| SS 304L Flange (Mumbai Market) | ₹ 4,252.31 | AED 220.46 |
| ASME SA182 F304L Blind Flange | ₹ 1,417.44 | AED 73.49 |
Note: The prices mentioned above are indicative and subject to change based on quantity, size, and market conditions. Please contact us for the latest pricing and availability.
Related Products
- Stainless Steel 304 Flanges
- Stainless Steel 304L Flanges
- Stainless Steel 304H Flanges
- Stainless Steel 310 Flanges
- Stainless Steel 310S Flanges
- Stainless Steel 316 Flanges
- Stainless Steel 316L Flanges
- Stainless Steel 316H Flanges
- Stainless Steel 317 Flanges
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Frequently Asked Questions
What is a stainless steel 304L flange?
A stainless steel 304L flange is a pipe fitting used to connect pipes, valves, and equipment in a piping system. It is made from low-carbon austenitic stainless steel, offering excellent corrosion resistance, high weldability, and strong performance in high-pressure and high-temperature industrial applications.
What does “L” mean in 304L stainless steel?
The “L” in 304L stands for Low Carbon. It means the carbon content is kept at a maximum of 0.03%, which reduces the risk of carbide precipitation during welding and improves resistance to intergranular corrosion — making it ideal for welded fabrications.
What is the difference between 304 and 304L flanges?
The key difference is carbon content. 304 flanges have a maximum carbon content of 0.08%, while 304L flanges have a lower carbon content of max 0.03%. This makes 304L flanges better for welding applications, as they are less prone to sensitization and intergranular corrosion after welding.
What is the UNS number for 304L stainless steel flanges?
The UNS number for 304L stainless steel is UNS S30403. It is also known as DIN/EN 1.4307 under European standards. These designations are used interchangeably in material test reports (MTRs) and international procurement.
What standard covers SS 304L flanges?
SS 304L flanges are primarily covered under ASTM A182 Grade F304L — the standard specification for forged or rolled alloy and stainless steel pipe flanges, fittings, and valves for high-temperature service. Dimensional standards include ASME B16.5 (up to 24″) and ASME B16.47 (large diameter flanges).
What is the difference between 304L and 304H flanges?
304L has lower carbon (max 0.03%) for improved weldability and corrosion resistance in fabricated assemblies. 304H has higher carbon (0.04–0.10%) for superior creep strength in elevated temperature service above 800°F. The two grades are not interchangeable in high-temperature applications.
