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Stainless Steel 304/304L Flanges are among the most commonly used stainless steel grades for flanges due to their excellent corrosion resistance, high strength, and durability. These flanges are made from an austenitic stainless steel alloy containing chromium and nickel, which provides superior oxidation resistance even in high-temperature environments.
The 304 and 304L grades differ mainly in their carbon content. Stainless Steel 304L Flanges have a lower carbon content compared to 304, making them more resistant to intergranular corrosion after welding. This property makes 304L the preferred choice for applications where welding is required without post-weld heat treatment.
Available in various types such as Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, and Threaded Flanges, these fittings are suitable for connecting pipes, valves, pumps, and other equipment to form a piping system. Each flange type is designed to handle different pressure ratings and mechanical requirements depending on the industry.
SS 304/304L Flanges are manufactured according to international standards like ASME SA182, ASTM A182, ANSI, DIN, JIS, and BS. These standards ensure consistent quality, strength, and compatibility with various piping systems used worldwide.
Thanks to their non-magnetic nature and smooth finish, Stainless Steel 304 and 304L Flanges are also used in industries that demand high levels of hygiene and cleanliness, such as food processing, beverage production, dairy, and pharmaceuticals. The easy-to-clean surface prevents contamination and bacterial growth.
In addition to hygienic applications, these flanges are extensively used in chemical, petrochemical, oil and gas, and marine industries. Their ability to withstand acids, alkalis, and chloride solutions makes them a reliable option in corrosive environments, including offshore and coastal operations.
Stainless Steel 304/304L Flanges offer excellent mechanical properties such as high tensile strength, yield strength, and elongation. They perform well under high-pressure and high-temperature conditions, providing long service life and minimal maintenance requirements.
One of the key advantages of these flanges is their versatility. They are available in various pressure classes ranging from Class 150 to Class 2500 and sizes from ½” to 48” or larger, depending on customer specifications. This flexibility makes them suitable for both small-scale and large industrial projects.
Specification Table
| Specification | Details |
|---|---|
| Product Name | Stainless Steel 304 / 304L Flanges |
| Grade | SS 304, SS 304L |
| Standard | ASME SA182 / ASTM A182, ANSI B16.5, B16.47 Series A & B, BS 4504, DIN, EN, JIS |
| Type | Weld Neck, Slip On, Blind, Socket Weld, Threaded, Lap Joint, Long Weld Neck, Reducing, Ring Type Joint (RTJ) |
| Size Range | ½” to 48” (DN15 to DN1200) or as per customer requirement |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Face Type | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Manufacturing Process | Forged, Heat Treated, Machined |
| Form | Flanges, Forgings, Rings, Discs |
| Finish | Polished, Cold Drawn, Hot Rolled, Bright, Pickled |
| Connection Type | Welded, Screwed, Threaded |
| Application Industries | Petrochemical, Oil & Gas, Food Processing, Pharmaceutical, Power Generation, Water Treatment, Marine & Chemical Industries |
| Origin | Indian / Imported (Depending on Manufacturer) |
Chemical Composition (Typical ranges for SS304/304)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | SS 304 (%) | SS 304L (%) |
|---|---|---|
| Carbon (C) | 0.08 max | 0.03 max |
| Manganese (Mn) | 2.00 max | 2.00 max |
| Silicon (Si) | 1.00 max | 1.00 max |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.030 max | 0.030 max |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 |
| Nitrogen (N) | 0.10 max | 0.10 max |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | SS 304 | SS 304L |
|---|---|---|
| Tensile Strength (MPa) | 515 min | 485 min |
| Yield Strength 0.2% Proof (MPa) | 205 min | 170 min |
| Elongation (% in 50mm) | 40 min | 40 min |
| Hardness (Brinell HB) | 201 max | 201 max |
| Modulus of Elasticity (GPa) | 193 | 193 |
| Melting Point (°C) | 1400 – 1450 | 1400 – 1450 |
| Density (g/cm³) | 8.0 | 8.0 |
| Poisson’s Ratio | 0.29 | 0.29 |
Equivalent Grades
| STANDARD | SS 304 | SS 304L |
|---|---|---|
| UNS | S30400 | S30403 |
| Werkstoff Nr. | 1.4301 | 1.4307 |
| EN | X5CrNi18-10 | X2CrNi18-9 |
| BS | 304S31 | 304S11 |
| JIS | SUS 304 | SUS 304L |
| GOST | 08Ch18N10 | 03Ch18N11 |
| AFNOR | Z7CN18-09 | Z2CN18-10 |
| ASTM / ASME | A182 F304 | A182 F304L |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Pipe Size (NPS) | Flange Outside Diameter (mm) | Flange Thickness (mm) | Raised Face Diameter (mm) | Bolt Circle Diameter (mm) | No. of Bolts | Bolt Hole Diameter (mm) | Approx. Weight (kg) |
|---|---|---|---|---|---|---|---|
| ½” | 90 | 11.2 | 35 | 60.3 | 4 | 15.9 | 0.6 |
| ¾” | 100 | 12.7 | 43 | 69.9 | 4 | 15.9 | 0.8 |
| 1” | 110 | 14.3 | 51 | 79.4 | 4 | 15.9 | 1.0 |
| 1½” | 125 | 15.9 | 73 | 98.4 | 4 | 15.9 | 1.6 |
| 2” | 150 | 17.5 | 92 | 120.7 | 4 | 19.1 | 2.4 |
| 3” | 190 | 19.1 | 127 | 152.4 | 4 | 19.1 | 4.0 |
| 4” | 228 | 22.3 | 157 | 190.5 | 8 | 19.1 | 5.8 |
| 6” | 279 | 25.4 | 216 | 241.3 | 8 | 22.2 | 10.5 |
| 8” | 343 | 28.6 | 270 | 298.5 | 8 | 22.2 | 15.6 |
| 10” | 406 | 30.2 | 324 | 362.0 | 12 | 25.4 | 24.2 |
Common Types Of Flangess
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Type of Flanges
General Flanges
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ASME B16.5 Flanges
Stainless Steel Flanges
Frequently Asked Questions (FAQ)
What are Stainless Steel 304 / 304L flanges?
Stainless Steel 304 and 304L flanges are forged components used to connect pipes, valves, and other equipment in a piping system. They are made from austenitic stainless steel alloys that offer excellent corrosion resistance, high strength, and durability in various industrial applications.
What is the difference between SS 304 and SS 304L flanges?
The main difference is carbon content. SS 304L has a lower carbon content (0.03% max) compared to SS 304 (0.08% max), which makes it more resistant to intergranular corrosion after welding. 304L is ideal for applications where welding is required without post-weld heat treatment.
What types of Stainless Steel 304/304L flanges are available?
Common types include Weld Neck, Slip-On, Blind, Threaded, Socket Weld, Lap Joint, and Ring Type Joint (RTJ) flanges. Each type is designed to meet different pressure, alignment, and sealing requirements.
What are the standard specifications for 304/304L flanges?
These flanges conform to standards such as ASTM A182 / ASME SA182, ANSI B16.5, B16.47, BS 4504, DIN, EN, and JIS. They are available in Class 150 to Class 2500 pressure ratings and sizes ranging from ½” to 48”.
Where are Stainless Steel 304/304L flanges used?
They are widely used in industries such as oil & gas, chemical processing, food & beverage, pharmaceuticals, power generation, water treatment, and marine engineering due to their corrosion resistance and hygienic properties.
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