Stainless Steel 321 / 321h Needle Tubes,321/321h Stainless Steel Needle Tube Manufacturer, SS 321/321h Needle Tube Supplier, SS 321/321h Needle Tube Exporter, Stainless Steel 321/321h Precision Tubing, SS 321/321h Small Diameter Tube ,SS 321/321h Needle Tubes
Sumer Metal Industries Private Limited is a leading manufacturer, supplier, and exporter of Stainless Steel 321 and 321H needle tubes, renowned for their high-quality and precision. These needle tubes are widely used in critical applications where resistance to intergranular corrosion and high-temperature stability are essential. The company caters to both domestic and international markets, exporting to countries like Oman, Qatar, Saudi Arabia, the UAE, Kuwait, Spain, Germany, the USA, Canada, and several regions across Africa.
Stainless Steel 321 is an austenitic stainless steel grade that is titanium-stabilized, making it resistant to chromium carbide precipitation and intergranular corrosion at temperatures between 800–1500°F (427–816°C). 321H, a high-carbon version of 321, provides improved high-temperature strength, making it suitable for more demanding industrial applications. These properties make the needle tubes ideal for furnaces, heat exchangers, and chemical processing equipment.
The chemical composition of SS 321 includes Carbon ≤ 0.08%, Chromium 17–19%, Nickel 9–12%, and Titanium 5×C to 0.70%, while SS 321H has Carbon ≤ 0.04–0.10% with the same Cr, Ni, and Ti content. These compositions provide excellent corrosion resistance, thermal stability, and mechanical properties required for precision-engineered needle tubes used in high-temperature environments.
Mechanical properties of these needle tubes are impressive. Both grades offer tensile strength around 515 MPa (75 ksi), yield strength 205 MPa (30 ksi), elongation of 40%, and Brinell hardness around 217. This combination of properties ensures durability, longevity, and safety in critical high-temperature applications, including gas turbines, combustion chambers, and boiler systems.
Specification of Stainless Steel 321 / 321hNeedle Tubes
| Property | Stainless Steel 321 | Stainless Steel 321H |
|---|---|---|
| Standard | ASTM A269 / A213 / A249 | ASTM A269 / A213 / A249 |
| Grade | 321 | 321H |
| Carbon (C) | ≤ 0.08% | 0.04 – 0.10% |
| Chromium (Cr) | 17 – 19% | 17 – 19% |
| Nickel (Ni) | 9 – 12% | 9 – 12% |
| Titanium (Ti) | 5 × C to 0.70% | 5 × C to 0.60% |
| Tensile Strength | 515 MPa (75 ksi) | 515 MPa (75 ksi) |
| Yield Strength (0.2% Offset) | 205 MPa (30 ksi) | 205 MPa (30 ksi) |
| Elongation | 40% | 40% |
| Hardness | Brinell 217 / Rockwell B 95 | Brinell 217 / Rockwell B 95 |
| Temperature Resistance | Up to 816°C (1500°F) | Up to 816°C (1500°F) |
| Applications | Heat exchangers, furnaces, kilns, boilers | High-temperature applications, chemical processing |
Sumer Metal Industries provides a variety of dimensions and finishes for SS 321/321H needle tubes. Available shapes include round, square, rectangular, ornamental, and electropolished tubes, with diameters ranging from 6 mm to 630 mm and wall thickness from 0.5 mm to 30 mm. Finishes include annealed, pickled, polished, and electropolished, offering versatility to meet the exact requirements of diverse industrial projects.
Chemical Composition of Stainless Steel 321 / 321hNeedle Tubes
| Element | Stainless Steel 321 (%) | Stainless Steel 321H (%) |
|---|---|---|
| Carbon (C) | ≤ 0.08 | 0.04 – 0.10 |
| Chromium (Cr) | 17 – 19 | 17 – 19 |
| Nickel (Ni) | 9 – 12 | 9 – 12 |
| 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 to 0.70 | 5 × C to 0.60 |
| Iron (Fe) | Balance | Balance |
In summary, Stainless Steel 321 and 321H Needle tubes combine the corrosion resistance and high-temperature capabilities of titanium-stabilized stainless steel with the thermal efficiency of Needle ned 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 / 321hNeedle Tubes
| Property | Stainless Steel 321 | Stainless Steel 321H |
|---|---|---|
| Standard | ASTM A269 / A213 / A249 | ASTM A269 / A213 / A249 |
| Grade | 321 | 321H |
| Carbon (C) | ≤ 0.08% | 0.04 – 0.10% |
| Chromium (Cr) | 17 – 19% | 17 – 19% |
| Nickel (Ni) | 9 – 12% | 9 – 12% |
| Titanium (Ti) | 5 × C to 0.70% | 5 × C to 0.60% |
| Tensile Strength | 515 MPa (75 ksi) | 515 MPa (75 ksi) |
| Yield Strength (0.2% Offset) | 205 MPa (30 ksi) | 205 MPa (30 ksi) |
| Elongation | 40% | 40% |
| Hardness | Brinell 217 / Rockwell B 95 | Brinell 217 / Rockwell B 95 |
| Temperature Resistance | Up to 816°C (1500°F) | Up to 816°C (1500°F) |
| Applications | Heat exchangers, furnaces, kilns, boilers | High-temperature applications, chemical processing |
🏭 Industry & Application
- ✅ SS 321/321h Needle Tubes for Medical Industry
- ✅ SS 321/321h Needle Tubes for Chemical Processing
- ✅ SS 321/321h Tubes for Needle Lines
- ✅ Stainless Steel 321 / 321h Needle Tubes for Gas & Liquid Flow
- ✅ SS 321/321h Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
1. What is the difference between Stainless Steel 321 and 321H?
Stainless Steel 321H has a higher carbon content than 321, which provides improved high-temperature strength while maintaining excellent corrosion resistance.
2. Can SS 321/321H needle tubes be used in high-temperature applications?
Yes, both grades are titanium-stabilized austenitic stainless steels, making them resistant to intergranular corrosion and suitable for temperatures up to 816°C (1500°F).
3. What sizes and forms are available for these needle tubes?
Sumer Metal Industries offers a wide range of sizes including round, square, rectangular, ornamental, and electropolished tubes. Diameters range from 6 mm to 630 mm with wall thickness from 0.5 mm to 30 mm.
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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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