SS Seamless Tubes Grade 321 Diameter 15.8mm X 0.9mm Thickness

SS Seamless Tubes Grade 321 Diameter 15.8mm X 0.9mm Thickness Stockholders, Suppliers & Exporters in India.

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.

What is SS Seamless Tube Grade 321?

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.

Key Features of SS Seamless Tubes Grade 321

  • High Resistance to Corrosion: Due to the inclusion of titanium, Grade 321 tubes are highly resistant to both general and localized corrosion, making them suitable for environments exposed to heat and chemicals.
  • Formability and Strength Even with its corrosion-resistant properties, Grade 321 remains easy to form and fabricate, which is crucial for manufacturing seamless tubes.
  • Thermal Stability: Even with its corrosion-resistant properties, Grade 321 remains easy to form and fabricate, which is crucial for manufacturing seamless tubes.

Dimensions: Diameter 15.8 mm x 0.9 mm Thickness

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.

  • Precision in Dimensions: These tubes must meet exacting standards to ensure a tight fit in various mechanical and industrial assemblies.
  • Applications in Specific Industries: Their size makes them particularly useful in industries like the chemical industry, where space constraints and performance under pressure are critical.


Process of SS Seamless Tubes

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)

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

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.

Applications of SS Seamless Tubes Grade 321

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:

  • Heat Exchangers and Boilers: Grade 321's resistance to high temperatures makes it ideal for these applications.
  • Automotive Industry: Grade 321's resistance to high temperatures makes it ideal for these applications.
  • Chemical Processing Plants: Grade 321's resistance to high temperatures makes it ideal for these applications.
  • Aerospace: Grade 321's resistance to high temperatures makes it ideal for these applications.


Our Stainless Steel Seamless Tube Used In Many Industries & Have Many Application
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