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Stainless Steel 904L Ferrule Fittings are high-performance components designed for use in highly corrosive and demanding industrial environments. Made from a low-carbon, high-alloy austenitic stainless steel, these fittings offer excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. The alloy’s composition includes significant amounts of nickel, molybdenum, and copper, which enhance its resistance to strong reducing acids like sulfuric acid. These fittings provide superior strength and durability, making them ideal for applications in chemical processing, marine, and oil & gas industries. They ensure leak-free and reliable performance even under extreme pressure and temperature conditions.
Manufactured according to ASTM A182 and ASME SA182 specifications, Stainless Steel 904L Ferrule Fittings exhibit excellent weldability and formability. The material’s non-stabilized low-carbon structure reduces the risk of carbide precipitation during welding, ensuring corrosion resistance in sensitized zones. These fittings are suitable for use in both oxidizing and reducing environments. They are available in various designs such as unions, elbows, tees, and adapters, catering to diverse piping configurations. The combination of high strength and superior corrosion resistance makes them a preferred choice for critical fluid and gas systems.
One of the key advantages of Stainless Steel 904L Ferrule Fittings is their excellent resistance to strong acids and chloride attack. The high nickel content provides superior resistance to stress corrosion cracking, while the addition of molybdenum offers enhanced protection against localized corrosion. They maintain their structural integrity and performance even when exposed to harsh chemicals and seawater environments. This makes them ideal for use in chemical plants, desalination systems, pulp and paper mills, and heat exchangers. Their long service life and low maintenance requirements contribute to operational efficiency.
The design of Stainless Steel 904L Ferrule Fittings incorporates a dual ferrule mechanism consisting of a front and back ferrule that compress onto the tubing when tightened. This ensures a secure, vibration-resistant, and leak-proof connection. The fittings can be easily assembled or disassembled without the need for welding, making maintenance simple and efficient. Precision machining ensures dimensional accuracy and smooth internal surfaces that reduce pressure loss and turbulence during fluid flow. These features enhance overall system reliability and performance in high-pressure instrumentation systems.
Stainless Steel 904L Ferrule Fittings are available in a wide range of sizes, pressure ratings, and configurations to meet various industrial needs. They undergo strict quality testing, including hydrostatic and pneumatic tests, to ensure they meet international standards like ASTM, ASME, DIN, and BS. Their dimensional accuracy and superior surface finish ensure easy installation and consistent sealing performance. These fittings are compatible with both metric and imperial tubing sizes, allowing for flexibility across different system designs. They are especially suited for use in high-purity and corrosive fluid systems.
The applications of Stainless Steel 904L Ferrule Fittings extend across several industries that demand exceptional corrosion resistance and mechanical strength. They are used in sectors such as oil & gas, chemical processing, power generation, pharmaceuticals, and marine engineering. The alloy’s resistance to high chloride content and reducing acids ensures safe and reliable operation in extreme conditions. The fittings maintain stability under thermal cycling and mechanical stress, preventing leakage or failure. Their combination of strength, ductility, and corrosion resistance ensures long-term operational reliability.
To achieve optimal performance, proper installation and maintenance of Stainless Steel 904L Ferrule Fittings are essential. Using compatible tubing materials and applying correct torque levels during assembly ensures a perfect seal. Periodic inspections help identify any early signs of wear or corrosion, extending the service life of the system. These fittings offer an excellent balance of cost-effectiveness, durability, and chemical resistance. With their proven reliability and superior material composition, Stainless Steel 904L Ferrule Fittings are a trusted solution for high-performance fluid and gas systems in critical industrial environments.
Specification Table
| Property | Specification |
|---|---|
| Material | Stainless Steel 904L |
| Standard | ASTM A182 / ASME B16.11 |
| Type | Ferrule / Tube Fittings |
| End Connection | Butt Weld / Socket Weld / Threaded |
| Size Range | 1/8" to 4" |
| Pressure Rating | Class 1500 / 3000 |
| Temperature Range | -50°C to 550°C |
| Corrosion Resistance | Excellent, suitable for strong acids and chemical environments |
| Surface Finish | Polished / Pickled / Passivated |
| Application | Chemical processing, marine, pharmaceutical, and industrial piping |
Chemical Composition (Typical ranges for SS904L)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition (wt%) |
|---|---|
| Carbon (C) | ≤ 0.02 |
| Manganese (Mn) | 1.0 max |
| Phosphorus (P) | 0.03 max |
| Sulfur (S) | 0.02 max |
| Silicon (Si) | 0.5 max |
| 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 | Unit |
|---|---|---|
| Density | 8.0 | g/cm³ |
| Tensile Strength (UTS) | 520 – 750 | MPa |
| Yield Strength (0.2% offset) | 215 – 275 | MPa |
| Elongation at Break | 35 – 50 | % |
| Hardness (Brinell) | 170 – 210 | HB |
| Modulus of Elasticity | 193 | GPa |
| Impact Strength (Charpy V-notch) | 100 – 150 | J |
| Melting Point | 1390 – 1420 | °C |
| Thermal Conductivity | 7.2 | W/m·K |
| Coefficient of Thermal Expansion | 16 | µm/m·°C |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 904L |
| UNS | N08904 |
| EN / DIN | 1.4539 |
| JIS | SUS 904L |
| AFNOR | Z2CNDU 19-11-4 |
| BS | 904L |
| ISO | 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 (inch) | OD (mm) | Length (mm) | Wall Thickness (mm) | Weight (kg/pc) |
|---|---|---|---|---|
| 1/8" | 10.3 | 38 | 1.5 | 0.05 |
| 1/4" | 12.7 | 40 | 1.65 | 0.08 |
| 3/8" | 17.0 | 45 | 2.0 | 0.12 |
| 1/2" | 21.3 | 50 | 2.3 | 0.18 |
| 3/4" | 26.7 | 55 | 2.8 | 0.30 |
| 1" | 33.4 | 60 | 3.2 | 0.50 |
| 1 1/4" | 42.2 | 70 | 3.6 | 0.80 |
| 1 1/2" | 48.3 | 75 | 4.0 | 1.10 |
| 2" | 60.3 | 85 | 4.5 | 1.80 |
| 2 1/2" | 73.0 | 95 | 5.0 | 2.80 |
| 3" | 88.9 | 100 | 5.5 | 3.90 |
| 4" | 114.3 | 120 | 6.0 | 6.50 |
Types Of Stainless Steel 904L Ferrule Fittingss and Tubes
Stainless Steel Ferrule Fitting
Monel 400 Ferrule Fitting
Hastelloy Ferrule Fitting
Nickel Ferrule Fitting
Super Duplex Ferrule Fitting
Duplex Ferrule Fitting
Inconel 600 Ferrule Fitting
Monel K500 Ferrule Fitting
Frequently Asked Questions (FAQ)
What is Stainless Steel 904L Ferrule Fittings?
Stainless Steel 904L Ferrule Fittings are high-alloy, corrosion-resistant pipe fittings designed for seamless connections in chemical, marine, and industrial applications. They provide superior durability and resistance to harsh environments.
What are the main applications of 904L Ferrule Fittings?
These fittings are widely used in chemical processing, seawater desalination plants, pharmaceuticals, petrochemicals, and other industries where high corrosion resistance is required.
What standards do 904L Ferrule Fittings comply with?
They typically comply with ASTM A182 and ASME B16.11 standards and are available in international equivalents such as UNS N08904, EN 1.4539, and JIS SUS 904L.
What sizes are available for 904L Ferrule Fittings?
They are available in a wide range of sizes, generally from 1/8" to 4" nominal diameter, with various wall thicknesses and pressure ratings.
How resistant is 904L to corrosion?
Stainless Steel 904L offers excellent resistance to strong acids, chlorides, and chemical environments, making it ideal for highly corrosive applications.
Can 904L Ferrule Fittings withstand high temperatures?
Yes, these fittings can handle a temperature range typically between -50°C and 550°C while maintaining mechanical strength and corrosion resistance.
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