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Stainless Steel 904L Flanges are high-temperature resistant components widely used in industries that demand excellent strength, oxidation resistance, and performance under extreme conditions. Manufactured from Grade 904L stainless steel, these flanges combine the superior properties of chromium and nickel, making them ideal for applications in heat treatment equipment, furnaces, and chemical processing plants.
Grade 904L stainless steel contains a high percentage of chromium (25%) and nickel (20%), providing outstanding resistance to oxidation and scaling even at temperatures up to 1100°C. The alloy offers good ductility and weldability, allowing it to be easily fabricated into various flange types such as weld neck, slip-on, blind, socket weld, lap joint, and threaded flanges.
SS 904L flanges are especially preferred in environments where sulfur dioxide gas and oxidizing atmospheres are present. Their excellent resistance to carburizing and reducing environments ensures long-term reliability and minimal maintenance. This makes them suitable for high-temperature service in industries like petrochemical, refinery, power generation, and heat exchangers.
One of the key advantages of Stainless Steel 904L Flanges is their superior corrosion resistance in moderately carburizing environments, as well as in environments containing nitric and sulfuric acids. They can also resist oxidation in continuous service up to 1150°C and intermittent service up to 1035°C, outperforming many standard stainless steel grades.
Stainless Steel 904L Flanges are available in a wide range of standards including ASME, ANSI, DIN, EN, and BS specifications. Common pressure ratings include Class 150, 300, 600, 900, and 1500, making them adaptable for different pressure and temperature conditions. Each flange is precisely machined to ensure accurate fit, easy installation, and leak-free operation.
To meet diverse industry needs, SS 904L flanges are offered in various surface finishes such as mirror finish, matte, rough-turned, and custom polished options. Their smooth surface finish enhances corrosion resistance while ensuring secure sealing in piping systems carrying hot gases, steam, or corrosive fluids.
These flanges exhibit excellent machinability and can be welded using standard fusion and resistance methods. However, the use of filler metals like AWS E904L electrodes is recommended to retain corrosion resistance. Post-weld heat treatment is not necessary in most applications, making fabrication efficient and cost-effective.
Stainless Steel 904L Flanges find applications in a wide range of sectors, including oil and gas refineries, thermal processing equipment, cement plants, chemical industries, power plants, and marine environments. Their ability to withstand repeated thermal cycling and extreme temperature variations makes them a reliable choice for long-term operations.
Specification Table
| Property | Specification / Value |
|---|---|
| Material Grade | SS 904L |
| Standards | ASTM A182, ASME B16.5, ASME B16.47, EN 1092-1 |
| Type | Weld Neck, Slip-On, Socket Weld, Blind, Threaded, Lap Joint |
| Size Range | 1/2" to 48" (DN 15 to DN 1200) |
| Pressure Rating | Class 150, 300, 400, 600, 900, 1500, 2500 |
| Finish | Polished, Pickled & Passivated, Mill Finish |
| Temperature Range | -196°C to 550°C |
| Corrosion Resistance | Excellent resistance to sulfuric acid, nitric acid, and other corrosive chemicals |
| Applications | Chemical processing, petrochemical, marine, oil & gas, power plants |
Chemical Composition (Typical ranges for SS904L)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.02 |
| Manganese (Mn) | ≤ 2.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
| Silicon (Si) | 0.5 – 1.0 |
| Chromium (Cr) | 19.0 – 23.0 |
| Nickel (Ni) | 23.0 – 28.0 |
| Molybdenum (Mo) | 4.0 – 5.0 |
| Copper (Cu) | 1.0 – 2.0 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength (UTS) | 500 – 700 MPa |
| Yield Strength (YS) | 215 – 275 MPa |
| Elongation (in 50 mm) | 40 – 50% |
| Hardness (Brinell, HB) | ≤ 200 |
| Modulus of Elasticity | 193 GPa |
| Impact Strength | ≥ 150 J at room temperature |
| Operating Temperature Range | -196°C to 550°C |
| Corrosion Resistance | Excellent resistance to sulfuric acid, nitric acid, and chloride environments |
Equivalent Grades
| Standard / Organization | Equivalent Grade |
|---|---|
| AISI / ASTM | 904L |
| UNS | N08904 |
| EN / DIN | 1.4539 / X1NiCrMoCu25-20-5 |
| JIS | SUS 904L |
| GB / Chinese Standard | 06Cr25Ni20MoCuN |
| BS / British Standard | 904L |
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 Size (NPS / DN) | Outside Diameter (OD) mm | Thickness / Schedule (mm) | Bolt Circle Diameter (BCD) mm | Number of Bolts | Weight (kg) |
|---|---|---|---|---|---|
| 1/2" (DN 15) | 60 | 11 | 90 | 4 | 0.5 |
| 1" (DN 25) | 90 | 14 | 115 | 4 | 1.2 |
| 2" (DN 50) | 150 | 16 | 165 | 4 | 3.0 |
| 4" (DN 100) | 240 | 20 | 200 | 8 | 10.5 |
| 6" (DN 150) | 295 | 22 | 220 | 8 | 18.5 |
| 8" (DN 200) | 360 | 24 | 295 | 8 | 32.0 |
| 10" (DN 250) | 445 | 26 | 360 | 12 | 55.0 |
| 12" (DN 300) | 520 | 28 | 410 | 12 | 80.0 |
Common Types Of Flangess
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Type of Flanges
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ASME B16.5 Flanges
Stainless Steel Flanges
Frequently Asked Questions (FAQ)
What is Stainless Steel 904L Flange?
Stainless Steel 904L Flange is a high-alloy, corrosion-resistant flange made from SS 904L grade, known for its excellent resistance to acids, chlorides, and harsh environments. It is widely used in chemical, petrochemical, marine, and oil & gas industries.
What types of 904L Flanges are available?
Common types include Weld Neck Flanges, Slip-On Flanges, Socket Weld Flanges, Threaded Flanges, Blind Flanges, and Lap Joint Flanges. These flanges are available in various sizes and pressure ratings to suit industrial requirements.
What are the specifications of SS 904L Flanges?
SS 904L Flanges are manufactured according to ASTM A182, ASME B16.5, ASME B16.47, and EN 1092-1 standards. They are available in pressure classes ranging from 150 to 2500 and sizes from 1/2" to 48" (DN 15 to DN 1200).
What is the chemical composition of SS 904L Flanges?
SS 904L contains 19-23% Chromium, 23-28% Nickel, 4-5% Molybdenum, 1-2% Copper, ≤0.02% Carbon, with Iron making up the balance. This composition provides superior corrosion resistance and mechanical strength.
What are the mechanical properties of 904L Flanges?
The typical properties include Tensile Strength: 500-700 MPa, Yield Strength: 215-275 MPa, Elongation: 40-50%, and Hardness: ≤200 HB. They can operate in temperatures ranging from -196°C to 550°C.
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