Stainless Steel 321 / 321h U Tubes,321/321h Stainless Steel U Tube Manufacturer, SS 321/321h U Tube Supplier, SS 321/321h U Tube Exporter, Stainless Steel 321/321h Precision Tubing, SS 321/321h Small Diameter Tube ,SS 321/321h U Tubes
Stainless Steel 321 / 321H U-Tubes from Sumer Metal Industries Private Limited are engineered U-bend tubes manufactured for high-temperature heat exchangers and process equipment. As a manufacturer, supplier and global exporter, Sumer Metal produces 321/321H U-tubes in seamless and welded constructions with controlled heat treatment and titanium stabilization to resist sensitization during thermal exposure. Our production includes mill-certified material, full traceability, U-bending to client radii, and export packaging tailored for long-haul shipments.
These grades are titanium-stabilized austenitic stainless steels designed to resist intergranular corrosion after exposure to elevated temperatures (sensitization). 321 is stabilized with titanium (Ti) to tie up carbon and avoid chromium carbide precipitation; 321H is the higher-carbon counterpart specified when elevated creep strength at sustained high temperatures is required. That combination makes 321/321H ideal for furnace components, superheater and reheater tubing, petrochemical heat exchangers, and other high-temperature service where prolonged thermal exposure occurs.
Sumer Metal exports 321/321H U-tubes to customers across Oman, Qatar, Saudi Arabia, the UAE, Kuwait, Spain, Germany, the USA, Canada and several regions across Africa, supplying all necessary documentation (EN 10204/3.1 MTC, commercial invoice, packing list, COO) and offering third-party inspection, PMI, and customized packing for sea/air shipments. We support project procurement with datasheets, welding and fabrication recommendations, and assistance with tube-sheet hole allowances and U-bend radii to integrate smoothly into your heat-exchanger designs.
We manufacture to common international tubing standards (for example ASTM A312 / A213 / A269 where applicable) and supply finishes such as mill-annealed (BA), pickled & passivated, or bright drawn. Typical quality checks include chemical analysis, tensile testing, and optionally NDT and hardness checks — plus titanium stabilization checks for proper Ti:C ratio. For demanding projects we offer pre-qualified welding procedures, sample certificates, and long-term supply agreements with regular QC reporting.
Specification of Stainless Steel 321 / 321hU Tubes
| Specification | Details |
|---|---|
| Material Grades | Stainless Steel 321 (UNS S32100), Stainless Steel 321H (UNS S32109) |
| Standard Specifications | ASTM A213 / A269 / A270, ASME BPE, 3-A, ISO |
| Outer Diameter (OD) | 1/2" to 4" (12.7 mm to 101.6 mm) |
| Wall Thickness | 0.035" to 0.120" (0.89 mm to 3.05 mm) |
| Surface Finish | Bright Annealed, Mechanically Polished, Electropolished (≤ 20 Ra µin) |
| Length | 6 meters (20 ft) standard; custom lengths available |
| Tolerance | OD: ±0.005", Wall Thickness: ±10%, Length: ±1% |
| Temperature Range | Up to 900°C (1652°F) continuous service (321), higher for 321H |
| Corrosion Resistance | Excellent resistance to oxidation and intergranular corrosion |
| Weldability | Excellent; suitable for orbital and automatic welding |
| Applications | Pharmaceutical, Food & Beverage, Dairy, Biotech, Chemical Processing |
| Certifications | EN 10204 3.1/3.2, FDA Compliant, ISO 9001, ASME BPE, 3-A U |
| End Type | Plain End, Beveled, or Custom (Tri-Clamp, Flanged, etc.) |
Choosing 321 or 321H for U-tubes balances high-temperature strength and weldability. 321 is preferred for excellent stabilization against intergranular attack in moderate to high temp service. 321H (higher carbon) is chosen where slightly higher creep and tensile strength at elevated temperature are necessary. Sumer Metal Industries can advise on grade selection for your operating temperature, media, and fabrication route — and can deliver cut-to-length U-bends or straight tubes for field bending per your specification.
Chemical Composition of Stainless Steel 321 / 321hU Tubes
| Element | 321 (%) | 321H (%) |
|---|---|---|
| Carbon (C) | 0.08 max | 0.08 – 0.10 (higher carbon) |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 | 9.0 – 13.0 |
| Titanium (Ti) | 5 × C min (typically ~0.5) | 5 × C min (typically ~0.5) |
| Manganese (Mn) | 2.0 max | 2.0 max |
| Silicon (Si) | 1.0 max | 1.0 max |
| Phosphorus (P) | 0.040 max | 0.040 max |
| Sulfur (S) | 0.030 max | 0.030 max |
| Iron (Fe) | Balance | Balance |
In summary, Stainless Steel 321 and 321H U tubes combine the corrosion resistance and high-temperature capabilities of titanium-stabilized stainless steel with the thermal efficiency of Uned 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 / 321hU Tubes
| Specification | Details |
|---|---|
| Material Grades | Stainless Steel 321 (UNS S32100), Stainless Steel 321H (UNS S32109) |
| Standard Specifications | ASTM A213 / A269 / A270, ASME BPE, 3-A, ISO |
| Outer Diameter (OD) | 1/2" to 4" (12.7 mm to 101.6 mm) |
| Wall Thickness | 0.035" to 0.120" (0.89 mm to 3.05 mm) |
| Surface Finish | Bright Annealed, Mechanically Polished, Electropolished (≤ 20 Ra µin) |
| Length | 6 meters (20 ft) standard; custom lengths available |
| Tolerance | OD: ±0.005", Wall Thickness: ±10%, Length: ±1% |
| Temperature Range | Up to 900°C (1652°F) continuous service (321), higher for 321H |
| Corrosion Resistance | Excellent resistance to oxidation and intergranular corrosion |
| Weldability | Excellent; suitable for orbital and automatic welding |
| Applications | Pharmaceutical, Food & Beverage, Dairy, Biotech, Chemical Processing |
| Certifications | EN 10204 3.1/3.2, FDA Compliant, ISO 9001, ASME BPE, 3-A U |
| End Type | Plain End, Beveled, or Custom (Tri-Clamp, Flanged, etc.) |
🏭 Industry & Application
- ✅ SS 321/321h U Tubes for Medical Industry
- ✅ SS 321/321h U Tubes for Chemical Processing
- ✅ SS 321/321h Tubes for U Lines
- ✅ Stainless Steel 321 / 321h U Tubes for Gas & Liquid Flow
- ✅ SS 321/321h Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1:What is Stainless Steel 321 / 321H?
Stainless Steel 321 is a titanium-stabilized austenitic stainless steel designed to resist intergranular corrosion at elevated temperatures. 321H is a higher carbon version of 321, offering improved strength and creep resistance in high-temperature applications.
Q2:What are the common applications of 321 / 321H U tubes?
They are widely used in pharmaceutical, food & beverage, dairy, biotechnology, and chemical industries, especially where high temperature resistance and hygiene are critical.
Q3:What surface finishes are available for 321 / 321H U tubes?
Common finishes include bright annealed, mechanically polished, and electropolished surfaces, typically with a roughness (Ra) less than 20 microinches to ensure hygienic conditions.
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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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