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Stainless Steel 321 and 321h Pipes & Tubes are high-performance austenitic stainless steels designed for applications requiring excellent corrosion resistance and enhanced resistance to intergranular corrosion. These alloys are stabilized with titanium, making them ideal for high-temperature environments where stress corrosion or carbide precipitation can occur. Sumer Metal Industries manufactures and supplies premium-quality SS 321/321h Pipes & Tubes to industries across the UAE, Saudi Arabia, Qatar, Kuwait, Bahrain, and Oman.
SS 321 and 321h Pipes & Tubes are widely used in chemical processing, petrochemical plants, power generation, and aerospace industries. Their ability to withstand prolonged exposure to elevated temperatures makes them suitable for furnace components, heat exchangers, boilers, and exhaust stacks. Additionally, their corrosion resistance ensures reliability in industries dealing with acidic and alkaline environments.
Stainless Steel 321 and 321H pipes and tubes are high-temperature austenitic stainless steels designed for superior corrosion resistance and mechanical strength in thermal applications. They are widely used in chemical processing, petrochemical, power generation, and industrial furnace systems where reliability under heat and corrosive conditions is essential.
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 a slightly higher carbon content (0.04–0.10%) to maintain strength at elevated temperatures while retaining corrosion resistance.
Sumer Metal Industries produces SS 321/321h Pipes & Tubes in both seamless and welded forms, adhering to international standards such as ASTM, ASME, and EN. Our manufacturing process ensures precise dimensions, uniform wall thickness, and excellent surface finish. We offer various sizes, schedules, and lengths to meet diverse industrial requirements, ensuring consistency and quality in every batch.
The chemical composition of SS 321/321h includes chromium, nickel, and titanium, providing excellent corrosion and oxidation resistance. The ‘h’ variant offers higher carbon content for improved creep and stress rupture strength at elevated temperatures. These pipes and tubes exhibit high tensile strength, good ductility, and impact resistance, making them suitable for both structural and process applications.
321/321H pipes and tubes exhibit 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 mechanical properties allow the tubes to withstand high-pressure and high-temperature industrial applications reliably.
The primary advantage of 321/321H pipes and tubes is their ability to maintain strength and corrosion resistance at temperatures up to 870°C (1598°F). Titanium stabilization prevents carbide precipitation during welding, preserving mechanical integrity and corrosion resistance under thermal cycling.
Specification Table
| Specification | Details |
|---|---|
| Material Grade | Stainless Steel 321 / 321h |
| Type | Seamless & Welded Pipes & Tubes |
| Standard | ASTM A312, ASTM A213, ASME SA312, ASME SA213 |
| End Connection | Plain End, Beveled End, Threaded, Customized |
| Surface Finish | Polished, Pickled & Passivated |
| Size Range | OD: 1/2" – 24" | Wall Thickness: SCH 10 – SCH 160 | Custom Sizes Available |
| Length | 6m, 12m, or as per client requirement |
| Temperature Range | Up to 900°C (for high-temperature applications) |
| Finish & Treatment | Annealed, Pickled & Passivated |
| Applications | Chemical Processing, Petrochemical, Power Plants, Heat Exchangers, Aerospace |
Chemical Composition (Typical ranges for SS321/321h)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.08 (321), 0.08 – 0.10 (321h) |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
| Titanium (Ti) | ≥ 5 × C (to stabilize against carbide formation) |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 515 – 827 |
| Yield Strength (0.2% Proof, MPa) | 205 – 275 |
| Elongation (%) | 40 min |
| Hardness (Brinell HB) | ≤ 201 |
| Impact Strength | Good at room temperature |
| Modulus of Elasticity (GPa) | 193 |
| Melting Point (°C) | 1450 – 1510 |
| Thermal Conductivity (W/m·K) | 16.2 at 100°C |
| Specific Heat (J/kg·K) | 500 at 100°C |
| Density (g/cm³) | 7.9 |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| AISI / ASTM | 321 / 321h |
| EN / DIN | X6CrNiTi18-10 / 1.4541 |
| JIS | SUH 321 / SUH 321h |
| GB / China | 06Cr18Ni10Ti |
| UNS | S32100 / S32109 |
| BS | 321S31 / 321S11 |
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) | Schedule | Weight per Meter (kg/m) |
|---|---|---|---|---|
| 1/2" | 21.3 | 2.77 | STD | 1.68 |
| 3/4" | 26.7 | 2.87 | STD | 2.17 |
| 1" | 33.4 | 3.38 | STD | 3.05 |
| 1 1/2" | 48.3 | 3.68 | STD | 4.76 |
| 2" | 60.3 | 3.91 | STD | 6.35 |
| 3" | 88.9 | 4.78 | STD | 11.0 |
| 4" | 114.3 | 4.85 | STD | 15.7 |
| 6" | 168.3 | 5.54 | STD | 27.2 |
| 8" | 219.1 | 6.35 | STD | 41.5 |
| 10" | 273.0 | 7.11 | STD | 58.6 |
| 12" | 323.9 | 7.62 | STD | 77.5 |
Types Of Stainless Steel 321/321h Pipe & Tubes
SS 321/321h Seamless Pipe
SS 321/321h Welded Pipe
SS 321/321h ERW Pipe
SS 321/321hS EFW Pipe
Stainless Steel 321/321hS Seamless Tube
321/321hH Stainless Steel Welded Tube
321/321h Stainless Steel Capillary Tube
321/321hH Stainless Steel Heat Exchanger Tubes
Frequently Asked Questions (FAQ)
1. What is Stainless Steel 321/321h?
Stainless Steel 321 is an austenitic stainless steel stabilized with titanium to prevent carbide precipitation. SS 321h is a high-carbon variant offering enhanced creep and stress rupture strength at elevated temperatures.
2. What are the main applications of SS 321/321h Pipes & Tubes?
They are commonly used in chemical processing, petrochemical plants, power generation, aerospace, heat exchangers, boilers, and high-temperature furnace components due to their excellent corrosion resistance and thermal stability.
3. What types of SS 321/321h Pipes & Tubes are available?
Sumer Metal Industries offers both seamless and welded SS 321/321h Pipes & Tubes in various sizes, schedules, and lengths, suitable for different industrial applications.
4. What standards do SS 321/321h Pipes & Tubes comply with?
These pipes and tubes comply with international standards such as ASTM A312, ASTM A213, ASME SA312, ASME SA213, and EN/DIN equivalents, ensuring high quality and reliability.
Pipes & Tubes Supplier
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