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 |
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