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Stainless Steel 321 Ferrule Fittings are premium-quality components engineered for high-temperature and corrosion-resistant applications. Made from titanium-stabilized austenitic stainless steel, these fittings offer excellent resistance to intergranular corrosion after exposure to temperatures within the chromium carbide precipitation range. The titanium content prevents carbide formation, ensuring stability and long-term durability. These fittings perform exceptionally well in continuous service environments up to 870°C and intermittent service up to 925°C. They are widely used in industries such as chemical processing, oil & gas, and power generation where reliability is paramount.
Manufactured to meet ASTM A182 and ASME SA182 standards, Stainless Steel 321 Ferrule Fittings exhibit outstanding mechanical properties, including high tensile and yield strength. The alloy’s superior resistance to oxidation and scaling makes it ideal for elevated-temperature operations. The fittings also demonstrate excellent formability and weldability, allowing for easy installation in complex systems. Available in configurations such as unions, elbows, tees, and adapters, they provide versatility across various piping and instrumentation applications. These fittings are engineered to deliver superior sealing and leak-proof connections under harsh conditions.
The primary advantage of Stainless Steel 321 Ferrule Fittings lies in their excellent corrosion resistance, particularly against organic and inorganic acids. Their stabilization with titanium enhances resistance to intergranular corrosion after welding or heat exposure. These fittings retain strength and toughness at cryogenic and high temperatures, ensuring long service life. They are suitable for systems handling steam, petroleum products, or other high-temperature fluids. Industries choose 321-grade fittings for applications where 304-grade fittings may suffer from carbide precipitation or loss of corrosion resistance.
The design of Stainless Steel 321 Ferrule Fittings incorporates a double ferrule mechanism, including a front and back ferrule that compress against the tubing when tightened. This ensures a strong, vibration-resistant, and leak-free joint. The fittings can be easily assembled and disassembled without the need for welding, simplifying maintenance. Their precision-machined surfaces provide excellent dimensional accuracy and smooth internal flow paths. The ferrule system’s secure sealing performance prevents leakage even under fluctuating pressure and temperature conditions, enhancing overall system efficiency.
Stainless Steel 321 Ferrule Fittings are available in a wide range of sizes, end connections, and pressure ratings to meet diverse industrial standards. Each fitting undergoes rigorous testing, including hydrostatic, pneumatic, and non-destructive testing, to ensure high-quality performance. The fittings conform to global specifications such as ASTM, ASME, DIN, and BS standards. Their corrosion and oxidation resistance make them ideal for applications involving repeated heating and cooling cycles. These fittings are commonly used in instrumentation, hydraulic systems, and process piping.
Due to their robust construction and excellent metallurgical properties, Stainless Steel 321 Ferrule Fittings are widely used in refineries, chemical plants, heat exchangers, power stations, and marine environments. Their ability to resist oxidation and maintain mechanical integrity at high temperatures ensures long-term reliability. The fittings exhibit superior fatigue resistance, making them suitable for dynamic systems subject to vibrations or mechanical stresses. Their cost-effectiveness and ease of installation add to their popularity across various industries seeking dependable piping connections.
To ensure optimal performance, proper installation and regular maintenance of Stainless Steel 321 Ferrule Fittings are essential. Using compatible tubing materials and correct torque values helps achieve secure, leak-tight joints. Periodic inspection helps detect signs of corrosion or wear, improving safety and system efficiency. These fittings combine durability, corrosion resistance, and thermal stability, making them a long-lasting solution for challenging environments. With their strong metallurgical stability and superior sealing performance, Stainless Steel 321 Ferrule Fittings are trusted components for high-performance industrial systems.
Specification Table
| Fitting Type | Size (inches) | End Type | Standard | Pressure Rating |
|---|---|---|---|---|
| Elbow | 1/2" - 4" | Ferrule | ASME B16.11 | Class 3000 |
| Tee | 1/2" - 4" | Ferrule | ASME B16.11 | Class 3000 |
| Reducer | 1/2" - 4" | Ferrule | ASME B16.11 | Class 3000 |
| Cap | 1/2" - 4" | Ferrule | ASME B16.11 | Class 3000 |
| Cross | 1/2" - 4" | Ferrule | ASME B16.11 | Class 3000 |
Chemical Composition (Typical ranges for SS321)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Minimum (%) | Maximum (%) |
|---|---|---|
| Carbon (C) | 0.08 | 0.08 |
| Chromium (Cr) | 17.0 | 19.0 |
| Nickel (Ni) | 9.0 | 12.0 |
| Manganese (Mn) | 0.5 | 2.0 |
| Silicon (Si) | 0.5 | 1.0 |
| Phosphorus (P) | – | 0.045 |
| Sulfur (S) | – | 0.03 |
| Titanium (Ti) | 5 × C min | 0.70 |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Yield Strength (0.2% Offset) | 205 MPa (min) |
| Tensile Strength | 515 MPa (min) |
| Elongation (in 50 mm) | 40% (min) |
| Hardness (Brinell) | ≤ 187 HB |
| Modulus of Elasticity | 193 GPa |
| Melting Point | 1450°C - 1510°C |
| Service Temperature | Up to 870°C continuous |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| AISI | 321 |
| ASTM | AISI 321 / UNS S32100 |
| EN / DIN | 1.4541 / X6CrNiTi18-10 |
| JIS | SUS321 |
| GB / Chinese Standard | 06Cr19Ni10 |
| IS / Indian Standard | IS 321 |
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.
| Fitting Type | Nominal Size (inch) | Dimension A (mm) | Dimension B (mm) | Dimension C (mm) | Weight (kg) |
|---|---|---|---|---|---|
| Elbow 90° | 1/2" | 50 | 50 | 25 | 0.12 |
| Elbow 90° | 1" | 65 | 65 | 32 | 0.25 |
| Tee | 1/2" | 50 | 50 | 25 | 0.15 |
| Tee | 1" | 65 | 65 | 32 | 0.30 |
| Reducer | 1" x 1/2" | 65 | 50 | 32 | 0.28 |
| Cap | 1" | 65 | - | - | 0.20 |
Types Of Stainless Steel 321 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 321?
Stainless Steel 321 is a titanium-stabilized austenitic stainless steel designed for high-temperature applications, offering excellent corrosion resistance and preventing carbide precipitation during welding.
What are ferrule fittings used for?
Ferrule fittings are used to join, reduce, or redirect stainless steel pipes and tubing in sanitary, industrial, and chemical applications. They provide leak-proof and hygienic connections.
What are the advantages of SS 321 ferrule fittings?
SS 321 ferrule fittings offer high corrosion resistance, durability, high-temperature performance, precision engineering, and easy installation and maintenance, making them ideal for critical applications.
Which industries use SS 321 ferrule fittings?
These fittings are commonly used in chemical processing, pharmaceuticals, food and beverage, petrochemical, oil and gas, and power plants due to their high-temperature and corrosion-resistant properties.
Are SS 321 ferrule fittings suitable for welding?
Yes, SS 321 is stabilized with titanium, which prevents carbide precipitation during welding, making it highly suitable for welded piping systems and high-temperature service.
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