Stainless steel seamless tubes have become essential components in a wide variety of industries, from construction to aerospace, thanks to their combination of durability, corrosion resistance, and high performance under extreme conditions. These tubes, especially in precision dimensions like 15.8 mm in diameter and 0.9 mm thickness, provide a perfect solution for applications requiring strength and stability in small-sized configurations.
But what makes stainless steel seamless tubes, specifically Grade 321, stand out? This article delves into the properties, uses, and benefits of Grade 321 SS seamless tubes, focusing on those with a diameter of 15.8 mm and a thickness of 0.9 mm.
Grade 321 stainless steel is an austenitic stainless steel that contains titanium as a stabilizing element. This grade is well-known for its excellent resistance to intergranular corrosion, which occurs in environments where the material is exposed to high temperatures. The addition of titanium ensures that the material maintains its mechanical properties at elevated temperatures, making it suitable for heat-related applications.
In comparison to other grades like 304 or 316, Grade 321 offers superior resistance to scaling and stress rupture at temperatures up to 900 °C, making it ideal for use in environments with significant thermal stress.
Tubes with a diameter of 15.8 mm and a thickness of 0.9 mm are commonly used for specialized applications where precision and space efficiency are crucial. Small-diameter tubes like these are widely employed in heat exchangers, automotive parts, and instrumentation.
Seamless tubes are produced by heating a solid round billet of stainless steel and then piercing it to create a hollow tube. For Grade 321, additional titanium is included in the alloy to give the steel its unique properties. Unlike welded tubes, seamless tubes have no weak points or seams, which can be areas of vulnerability under pressure or corrosion.
This seamless construction provides a uniform structure, increasing its ability to resist high pressure and temperatures.
| Stainless Steel Tubes Dimension – (S.S. Tubes) | ||||||||||||
| Wall thickness in mm. | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.2 | 1.6 | 2 | 2.6 | 3 | 3.2 | 3.6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| O.D. in mm. | Weight in kg/meter | |||||||||||
| 6 | 0.069 | 0.081 | 0.093 | 0.104 | 0.125 | 0.144 | 0.176 | – | – | – | – | – |
| 9.52 | 0.112 | 0.134 | 0.154 | 0.174 | 0.213 | 0.249 | 0.317 | – | – | – | – | – |
| 10 | 0.119 | 0.141 | 0.163 | 0.184 | 0.225 | 0.264 | 0.336 | – | – | – | – | – |
| 12.7 | 0.153 | 0.182 | 0.21 | 0.238 | 0.293 | 0.345 | 0.444 | – | – | – | – | – |
| 14 | 0.169 | 0.201 | 0.233 | 0.264 | 0.325 | 0.384 | 0.496 | – | – | – | – | – |
| 15.87 | 0.192 | 0.229 | 0.266 | 0.301 | 0.372 | 0.44 | 0.571 | 0.694 | – | – | – | – |
| 19 | 0.231 | 0.276 | 0.32 | 0.364 | 0.45 | 0.534 | 0.696 | 0.85 | 1.066 | 1.2 | 1.264 | – |
| 25 | 0.306 | 0.366 | 0.425 | 0.484 | 0.6 | 0.714 | 0.936 | 1.15 | 1.456 | 1.65 | 1.744 | 1.926 |
| 25.4 | 0.311 | 0.372 | 0.432 | 0.492 | 0.61 | 0.726 | 0.952 | 1.17 | 1.482 | 1.68 | 1.776 | 1.962 |
| 31.8 | – | – | – | – | – | 0.918 | 1.208 | 1.49 | 1.898 | 2.16 | 2.288 | 2.538 |
| 38 | – | – | – | – | – | 1.104 | 1.456 | 1.8 | 2.301 | 2.625 | 2.784 | 3.096 |
| 44.5 | – | – | – | – | – | 1.299 | 1.716 | 2.125 | 2.724 | 3.113 | 3.304 | 3.681 |
| 50.8 | – | – | – | – | – | 1.488 | 1.968 | 2.44 | 3.133 | 3.585 | 3.808 | 4.248 |
| 63.5 | – | – | – | – | – | – | 2.476 | 3.075 | 3.959 | 4.538 | 4.824 | 5.391 |
| 76.1 | – | – | – | – | – | – | 2.98 | 3.705 | 4.778 | 5.483 | 5.832 | 6.525 |
| 101.6 | – | – | – | – | – | – | 4 | 4.98 | 6 | 7 | 7,872 | 8.82 |
| CHEMICAL COMPOSITION ( IN PERCENTAGE ) | ||||||||||
| Grade | C (Max) | Mn (Max) | P (Max) | S (Max) | Si (Max) | Cr | Ni | Mo | Nitrogen (Max) | Cu/ Others |
| 301 | 0.15 | 2 | 0.045 | 0.03 | 1 | 16.00 – 18.00 | 6.00 – 8.00 | – | 0.1 | – |
|---|---|---|---|---|---|---|---|---|---|---|
| 304 | 0.08 | 2 | 0.045 | 0.03 | 0.75 | 18.00 – 20.00 | 8.00- 10.50 | – | 0.1 | – |
| 304L | 0.03 | 2 | 0.045 | 0.03 | 0.75 | 18.00 – 20.00 | 8.00- 12.00 | – | 0.1 | – |
| 310S | 0.08 | 2 | 0.045 | 0.03 | 1.5 | 24.00- 26.00 | 19.00 – 22.00 | – | – | – |
| 316 | 0.08 | 2 | 0.045 | 0.03 | 0.75 | 16.00 – 18.00 | 10.00 – 14.00 | 2.00 – 3.00 | 0.1 | – |
| 316L | 0.03 | 2 | 0.045 | 0.03 | 0.75 | 16.00 – 18.00 | 10.00 – 14.00 | 2.00 – 3.00 | 0.1 | – |
| 317 | 0.08 | 2 | 0.045 | 0.03 | 0.75 | 18.00 – 20.00 | 11.00 – 14.00 | 3.00 – 4.00 | 0.1 | – |
| 317L | 0.03 | 2 | 0.045 | 0.03 | 0.75 | 18.00 – 20.00 | 11.00 – 15.00 | 3.00 – 4.00 | 0.1 | – |
| 321 | 0.08 | 2 | 0.045 | 0.03 | 0.75 | 17.00 – 19.00 | 9.00 – 12.00 | – | 0.1 | Ti5 ( C + N ) Min or 0.70 max |
| 347 | 0.08 | 2 | 0.045 | 0.03 | 0.75 | 17.00 – 19.00 | 9.00 – 13.00 | – | – | Cb= 10x ( C Min ) or 1.00 Max |
| 409 | 0.08 | 1 | 0.04 | 0.01 | 1 | 10.50 – 11.75 | 0.5 | – | – | Ti= 6x (C+ N ) Min or 0.70 Max |
| 409M | 0.03 | 0.81.2 | 0.03 | 0.03 | 0.40.75 | 11.00- 12.00 | 1.5 max. | – | – | Ti= 6x (C) Min or 0.70 Max |
| 410S | 0.08 | 1 | 0.04 | 0.03 | 1 | 11.50- 13.50 | 0.6 | – | – | – |
| 410 | 0.15 | 1 | 0.04 | 0.03 | 1 | 11.50- 13.50 | 0.75 | – | – | – |
| 420 | 0.35 | 0.5 | 0.035 | 0.015 | 0.5 | 12.00 – 13.00 | 0.20.3 | – | – | – |
| 430 | 0.12 | 1 | 0.04 | 0.03 | 1 | 16.00 – 18.00 | 0.75 | – | – | – |
| JSL AUS | 0.08 | 7.08.0 | 0.07 | 0.03 | 0.75 | 15.50 – 16.50 | 4.25 – 4.75 | – | – | 0.9 – 1.10 |
| JS- 203 | 0.08 | 9.2510.25 | 0.07 | 0.03 | 0.75 | 14.25 – 15.25 | 2.25 – 2.75 | – | – | 1.60- 2.0 |
| 301M | 0.1 | 4.55.5 | 0.06 | 0.03 | 0.75 | 14.50 – 15.50 | 6.0 – 7.0 | – | – | 1.70- 1.90 |
| * Thickness of 1.27mm & below will have elongation of 20% min. | ||||||||||
Stainless steel seamless tubes, particularly those made from Grade 321, are used across a wide range of industries. Some of the most common applications include:
| Our Stainless Steel Seamless Tube Used In Many Industries & Have Many Application |
| Stainless Steel Boiler Seamless Tubes |
| Stainless Steel Capillay Seamless Tubes |
| Stainless Steel ANSI/ASME Pipe |
| Stainless Steel Bimetalic Seamless Tubes |
| Stainless Steel Coiled Tubing |
| Stainless Steel Composite Seamless Tubes |
| Stainless Steel Condensor Seamless Tubes |
| Stainless Steel Ethylene Furnace Seamless Tubes |
| Stainless Steel Evaporator Seamless Tubes |
| Stainless Steel Finned Seamless Tubes |
| Stainless Steel Fuinace Seamless Tubes |
| Stainless Steel Gasoline Direct Injection Seamless Tubes |
| Stainless Steel Heat Exchanger Seamless Tubes |
| Stainless Steel High Pressure Seamless Tubes |
| Stainless Steel MTC in accordance with EN10204 NACE 3.1 |
| Stainless Steel Automotive Aftermarket Direct Injection: Diesel-Tested, Gasoline-Approved |
| Stainless Steel High Temperature Seamless Tubes |
| Stainless Steel Hollow Bar |
| Stainless Steel Hydraulic Tubing |
| Stainless Steel Instrumentation Tubing |
| Stainless Steel ISO/EN Seamless Tubes |
| Stainless Steel Lance Seamless Tubes |
| Stainless Steel Mechanical Seamless Tubing |
| Stainless Steel Medical Seamless Tube |
| Stainless Steel Muffle Seamless Tubes |
| Stainless Steel Nuclear Fuel Seamless Tubes |
| Stainless Steel Nuclear Steam Generation Tubing |
| Stainless Steel Precision Seamless Tubes |
| Stainless Steel Recupertor Seamless Tubes |
| Stainless Steel Reheater Seamless Tubes |
| Stainless Steel Scrubber Seamless Tubes |
| Stainless Steel Steam Generation Seamless Tubes |
| Stainless Steel Stripper Seamless Tubes |
| Stainless Steel Subsea Seamless Tubes |
| Stainless Steel Superheater Seamless Tubes |
| Stainless Steel Thermocouple Seamless Tubes |
| Stainless Steel Umbilical Seamless Tubes |
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