Stainless Steel 321 / 321h Clad Tubes,321/321h Stainless Steel Clad Tube Manufacturer, SS 321/321h Clad Tube Supplier, SS 321/321h Clad Tube Exporter, Stainless Steel 321/321h Precision Tubing, SS 321/321h Small Diameter Tube ,SS 321/321h Clad Tubes
Sumer Metal Industries Private Limited manufactures, supplies and exports high-quality Stainless Steel 321 / 321H Clad Tubes, engineered for demanding high-temperature applications. Produced under strict quality controls, these tubes are routinely supplied in pickled/annealed or bright-drawn finishes to clients in Oman, Qatar, Saudi Arabia, the UAE, Kuwait, Spain, Germany, the USA, Canada and several regions across Africa. Our production lines are optimized to deliver consistent microstructure and dimensional accuracy suitable for Clads, superheaters, heat exchangers and high-temperature piping.
Grade 321 is a titanium-stabilized austenitic stainless steel designed to resist intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range (425–850°C). 321H is the higher-carbon variant intended for service at elevated temperatures where slightly higher creep and tensile strength at temperature are required—making 321H a preferred choice when the equipment sees sustained high-temperature exposure.
Sumer Metal Industries emphasizes traceability and certification: each heat of 321 / 321H tubing is supplied with mill test certificates (MTC) that show chemistry, mechanical test results, heat/lot numbers and applicable standards. Typical supply forms available from our factories include welded and seamless tubes, cut-to-length pieces, NDT (where requested), and optional third-party inspection for critical export projects.
The main markets we serve—power plants, petrochemical and refinery units, fertilizer and chemical plants, and heavy industrial Clads—value 321/321H for their combination of oxidation resistance, dimensional stability at temperature, and weldability. Compared with plain 304/316, the titanium stabilization of 321 reduces the risk of sensitization and subsequent intergranular corrosion during thermal cycling.
Specification of Stainless Steel 321 / 321hClad Tubes
| Specification | Outside Diameter (OD) | Wall Thickness | Length |
|---|---|---|---|
| ASTM A312 / A358 | 6.00 mm to 914.4 mm | 1.00 mm to 3.00 mm | Single Random, Double Random, or Custom Lengths |
| ASTM A213 / A269 | 1/8" OD to 2" OD | 0.028" to 0.156" | Custom Lengths |
| EN 10216-5 | 10 mm to 610 mm | 1.0 mm to 12.5 mm | As per client requirement |
| DIN 17458 | 6 mm to 406 mm | 0.5 mm to 12 mm | Custom Lengths |
Quality assurance at Sumer Metal Industries includes process controls on raw billets, mandrel/weld parameters for welded tubes, NDT (Eddy current or ultrasonic) for critical orders, and finish inspection to ensure roundness, straightness and surface quality. We also offer custom packaging and export documentation to meet country-specific customs and project requirements for the Middle East, Europe, North America and Africa.
Chemical Composition of Stainless Steel 321 / 321hClad Tubes
| Element | Stainless Steel 321 (%) | Stainless Steel 321H (%) |
|---|---|---|
| Carbon (C) | Max 0.08 | 0.04 – 0.10 |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 | 9.0 – 12.0 |
| Titanium (Ti) | 0.70 max | 0.70 max |
| Manganese (Mn) | Max 2.00 | Max 2.00 |
| Silicon (Si) | Max 0.75 | Max 0.75 |
| Phosphorus (P) | Max 0.045 | Max 0.045 |
| Sulfur (S) | Max 0.030 | Max 0.030 |
| Iron (Fe) | Balance | Balance |
In summary, Stainless Steel 321 and 321H Clad tubes combine the corrosion resistance and high-temperature capabilities of titanium-stabilized stainless steel with the thermal efficiency of Cladned surfaces. They are engineered to deliver reliable, efficient heat exchange in industrial systems, making them a top choice for industries that require longevity and performance under tough conditions.
Specification of Stainless Steel 321 / 321hClad Tubes
| Specification | Outside Diameter (OD) | Wall Thickness | Length |
|---|---|---|---|
| ASTM A312 / A358 | 6.00 mm to 914.4 mm | 1.00 mm to 3.00 mm | Single Random, Double Random, or Custom Lengths |
| ASTM A213 / A269 | 1/8" OD to 2" OD | 0.028" to 0.156" | Custom Lengths |
| EN 10216-5 | 10 mm to 610 mm | 1.0 mm to 12.5 mm | As per client requirement |
| DIN 17458 | 6 mm to 406 mm | 0.5 mm to 12 mm | Custom Lengths |
🏭 Industry & Application
- ✅ SS 321/321h Clad Tubes for Medical Industry
- ✅ SS 321/321h Clad Tubes for Chemical Processing
- ✅ SS 321/321h Tubes for Clad Lines
- ✅ Stainless Steel 321 / 321h Clad Tubes for Gas & Liquid Flow
- ✅ SS 321/321h Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
1. What are the primary applications of Stainless Steel 321 / 321H Clad Tubes?
These tubes are widely used in high-temperature applications such as heat exchangers, exhaust systems, chemical processing equipment, and petrochemical industries due to their excellent resistance to oxidation and intergranular corrosion.
2. How does the addition of titanium enhance the properties of Stainless Steel 321 / 321H?
Titanium stabilizes the alloy by binding with carbon and nitrogen, preventing carbide precipitation during welding and enhancing resistance to intergranular corrosion, making the tubes more durable in high-temperature environments.
3. What is the difference between Stainless Steel 321 and 321H?
The primary difference lies in the carbon content. Stainless Steel 321H has a higher carbon content (0.04–0.10%) than 321 (max 0.08%), providing improved high-temperature strength while maintaining corrosion resistance.
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At Sumer Metal Industries Pvt. Ltd., we follow a zero-defect policy by implementing stringent quality checks, using certified raw materials, and continuously improving our processes to deliver reliable and consistent tubing solutions
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