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Stainless Steel 321/321H Pipe Fittings are high-performance components designed for industrial piping systems that require excellent resistance to corrosion and oxidation. These fittings are widely used in chemical, petrochemical, power generation, and food processing industries due to their durability and ability to withstand extreme temperatures.
Made from SS 321 and SS 321H alloys, these pipe fittings are stabilized with titanium to prevent carbide precipitation during welding. This ensures long-term corrosion resistance, especially in high-temperature applications where standard austenitic stainless steels may fail. The SS 321H variant contains a higher carbon content, enhancing its strength at elevated temperatures.
Stainless Steel 321 and 321H pipe fittings are austenitic stainless steels designed for high-temperature applications. They offer excellent resistance to intergranular corrosion and stress corrosion cracking, making them ideal for piping systems in chemical processing, petrochemical, power generation, and industrial furnace applications.
SS 321 contains approximately 17–19% chromium, 9–12% nickel, and a small addition of titanium (0.5%), which stabilizes the alloy against carbide precipitation during welding. The 321H variant has higher carbon content (0.04–0.10%) to maintain strength at elevated temperatures while retaining corrosion resistance.
Our range of Stainless Steel 321/321H Pipe Fittings includes elbows, tees, reducers, caps, and flanges, available in multiple sizes and pressure ratings. Each fitting is manufactured according to international standards such as ASTM A403, ensuring compatibility, reliability, and ease of installation in critical piping systems.
These fittings offer excellent mechanical properties, including high tensile strength, yield strength, and hardness. They maintain dimensional stability under thermal cycling and resist oxidation and scaling even in harsh industrial environments. This makes them ideal for use in boiler tubes, heat exchangers, and exhaust systems.
321/321H pipe fittings have tensile strength ranging from 515–700 MPa and yield strength between 205–310 MPa. Elongation is typically 35–45%, providing excellent toughness and ductility. These properties allow the fittings to withstand high-pressure and high-temperature environments reliably.
These stainless steel fittings can operate effectively in temperatures up to 870°C (1598°F). The titanium stabilization prevents carbide precipitation, maintaining corrosion resistance and mechanical integrity during thermal cycling in high-temperature pipelines and equipment.
Specification Table
| Property | Details |
|---|---|
| Material Grade | SS 321 / SS 321H |
| Standards | ASTM A403 / ASME B16.9 / ASME B16.11 |
| Product Types | Elbows, Tees, Reducers, Caps, Flanges |
| Size Range | 1/2" to 48" (DN15 to DN1200) |
| Schedule/Thickness | Sch 10 to Sch 160 / Customized |
| Temperature Range | -196°C to 800°C (-320°F to 1472°F) |
| Corrosion Resistance | Excellent resistance to oxidizing and mildly reducing environments |
| Applications | Chemical, Petrochemical, Power Plants, Food Processing, Boilers, Heat Exchangers |
Chemical Composition (Typical ranges for SS321/321H)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | SS 321 (%) | SS 321H (%) |
|---|---|---|
| Carbon (C) | ≤ 0.08 | 0.08 – 0.10 |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 | 9.0 – 12.0 |
| Manganese (Mn) | ≤ 2.0 | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 | ≤ 0.03 |
| Titanium (Ti) | 5 × C min – 0.70 max | 5 × C min – 0.70 max |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | SS 321 | SS 321H |
|---|---|---|
| Tensile Strength (MPa) | 515 – 827 | 515 – 827 |
| Yield Strength (0.2% Offset, MPa) | 205 – 275 | 205 – 275 |
| Elongation (%) | 40 min | 40 min |
| Hardness (Brinell, HB) | ≤ 201 | ≤ 201 |
| Modulus of Elasticity (GPa) | 193 – 200 | 193 – 200 |
| Impact Toughness (J) | > 40 | > 40 |
| Operating Temperature Range | -196°C to 800°C | -196°C to 800°C |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| AISI/SAE | 321 / 321H |
| UNS | S32100 / S32109 |
| EN | 1.4541 / 1.4878 |
| DIN | X6CrNiTi18-10 / X6CrNiTi18-12 |
| JIS | SUH 321 / SUH 321H |
| GB | 06Cr19Ni10 / 06Cr19Ni10Ti |
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) | Outside Diameter (mm) | Wall Thickness (mm) | Center to End (mm) | Weight (kg) |
|---|---|---|---|---|
| 1/2" | 21.3 | 2.77 | 38 | 0.25 |
| 1" | 33.4 | 3.38 | 57 | 0.55 |
| 2" | 60.3 | 3.91 | 95 | 1.35 |
| 4" | 114.3 | 4.78 | 165 | 4.85 |
2. Tees (Equal)
| Nominal Pipe Size (NPS) | Outside Diameter (mm) | Wall Thickness (mm) | Length (mm) | Weight (kg) |
|---|---|---|---|---|
| 1/2" | 21.3 | 2.77 | 76 | 0.45 |
| 1" | 33.4 | 3.38 | 102 | 1.10 |
| 2" | 60.3 | 3.91 | 152 | 3.10 |
| 4" | 114.3 | 4.78 | 229 | 9.40 |
Types Of Pipe Fittingss and Tubes
Tube Unions
Bite Type Tube Fittings
Stainless Steel Pipe Fittings
Forged Fsitting
Fitting
Carbon Steel Butt Weld Pipe Fittings
Frequently Asked Questions (FAQ)
Q1: What are Stainless Steel 321/321H Pipe Fittings used for?
A1: SS 321/321H pipe fittings are used in high-temperature and corrosive environments such as chemical processing, petrochemical, power plants, boilers, heat exchangers, and food processing industries.
Q2: What is the difference between SS 321 and SS 321H?
A2: The main difference is carbon content. SS 321H has a slightly higher carbon content (0.08–0.10%) for improved high-temperature strength, while SS 321 has ≤0.08% carbon. Both are stabilized with titanium to prevent carbide precipitation.
Q3: Which standards do SS 321/321H pipe fittings comply with?
A3: These fittings comply with ASTM A403, ASME B16.9, ASME B16.11, and other international standards ensuring dimensional accuracy, pressure ratings, and reliability.
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