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
Sumer Metal Industries Private Limited manufactures high-quality Stainless Steel 321 / 321H U-Tubes, engineered for demanding heat-exchanger and high-temperature applications. Our 321/321H U-tubes are produced using titanium stabilization to resist carbide precipitation and intergranular attack after exposure to temperatures in the carbide-precipitation range. We offer both seamless and welded constructions, finished to industry tolerances and packaged for safe export.
As a trusted manufacturer, supplier and exporter, Sumer Metal Industries ships U-tubes worldwide — including Oman, Qatar, Saudi Arabia, UAE, Kuwait, Spain, Germany, the USA, Canada and multiple regions across Africa — with mill test certificates and inspection reports on request. Our export process supports bulk coil, cut-to-length tube and finished U-tube bundles to match client specifications.
The distinguishing feature of SS-321/321H is titanium stabilization (plus higher controlled carbon in 321H) which prevents chromium carbide precipitation and improves creep resistance at elevated temperatures; 321H has higher carbon limits to increase strength/creep resistance above about 500–600 °C. These properties make the material ideal for furnace parts, heat exchangers, flue gas ducts, and petrochemical equipment.
Sumer Metal Industries manufactures to industry specifications (common standards used: ASTM A269, A213, A312, A358 and ASME equivalents) and offers full traceability. Our in-house QA team performs dimensional checks, material tests (chemical analysis, hardness, tensile) and non-destructive inspections before packing for export.
Specification of Stainless Steel 321 / 321hU Tubes
| Property | Specification |
|---|---|
| Standards | ASTM A213, ASTM A269, ASTM A312, ASTM A789, ASME SA213 |
| Grades | Stainless Steel 321, Stainless Steel 321H |
| Size Range (OD) | 6.35 mm – 101.6 mm (1/4” – 4”) |
| Wall Thickness | 0.5 mm – 8.0 mm |
| U-Bend Radius | As per customer requirement (typically 1.5D, 2D, 3D) |
| Length | Straight up to 30 meters, U-bent as per design |
| End Finish | Plain end, Beveled end, Threaded end |
| Manufacturing Process | Seamless / Welded / Cold Drawn |
| Surface Finish | Bright Annealed, Pickled, Polished |
Surface finish and tolerances are customised per order — we supply annealed, pickled & passivated tubes or mill-polished finishes for hygienic or aesthetic uses. We can deliver tubes ready-bent into U-shapes (U-tubes), with precision bending to minimise ovality and maintain wall-thickness consistency through bends. Packaging is export-grade: wooden boxes, steel strapping and protective end plugs. (Internal handling, marking and certification per buyer’s spec.)
Chemical Composition of Stainless Steel 321 / 321hU Tubes
| Element | SS 321 (typical) | SS 321H (typical) |
|---|---|---|
| Carbon (C) | ≤ 0.08 | 0.04 – 0.10 (elevated C for improved creep strength) |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 | ≤ 0.03 |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 | 9.0 – 12.0 |
| Titanium (Ti) | Typically 5×C (min) — commonly 0.15 – 0.70 | Same as 321 — stabilised with Ti |
| 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
| Property | Specification |
|---|---|
| Standards | ASTM A213, ASTM A269, ASTM A312, ASTM A789, ASME SA213 |
| Grades | Stainless Steel 321, Stainless Steel 321H |
| Size Range (OD) | 6.35 mm – 101.6 mm (1/4” – 4”) |
| Wall Thickness | 0.5 mm – 8.0 mm |
| U-Bend Radius | As per customer requirement (typically 1.5D, 2D, 3D) |
| Length | Straight up to 30 meters, U-bent as per design |
| End Finish | Plain end, Beveled end, Threaded end |
| Manufacturing Process | Seamless / Welded / Cold Drawn |
| Surface Finish | Bright Annealed, Pickled, Polished |
🏭 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 are SS 321 / 321H U-tubes used for?
Titanium-stabilized SS-321/321H U-tubes are used in heat exchangers, furnace parts, expansion joints, and petrochemical high-temperature service where resistance to intergranular corrosion and good high-temperature strength are required.
Q2: What’s the difference between 321 and 321H?
321H has a higher controlled carbon content (approx. 0.04–0.10 wt%) to improve creep strength and high-temperature performance; 321 has lower maximum carbon (≤0.08 wt%) for general use. Both are titanium-stabilized.
Q3:Does Sumer Metal Industries export certified 321/321H U-tubes?
Yes — we provide mill test certificates (MTC), inspection reports and can meet ASTM/ASME certification requirements for export to GCC countries, Europe, North America and Africa.
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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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