SS Seamless Tubes Grade 321 Diameter 19.3mm X 0.9mm Thickness

SS Seamless Tubes Grade 321 Diameter 19.3mm X 0.9mm Thickness Stockholders, Suppliers & Exporters in India.

Stainless steel seamless tubes are an essential component in industries that demand high precision and durability. Among the various grades available, SS Seamless Tubes in Grade 321 are highly regarded for their exceptional high-temperature performance and corrosion resistance. When discussing Grade 321 with a diameter of 19.3 mm and 0.9 mm thickness, the focus shifts to its unique application in highly demanding environments. But what makes this particular grade and size combination so important? Let’s dive in.

What Is SS Seamless Tubes?

Seamless tubes are pipes or tubing products made without any welding or joints, providing uniform strength and performance throughout their length. They are known for their ability to handle high pressure and heat without breaking or leaking.

Key Characteristics of Seamless Tubes

  • No welds or seams: ensuring uniformity and strength.
  • Higher pressure ratings compared to welded tubes.
  • Superior strength : compared to welded tubes.

Understanding Grade 321 Stainless Steel

Grade 321 is a titanium-stabilized austenitic stainless steel, making it a preferred choice for high-temperature applications. It is similar to Grade 304 but offers enhanced resistance to intergranular corrosion after exposure to high temperatures.

  • Main Elements: Chromium (17-19%), Nickel (9-12%), and Titanium (0.7%).
  • Stabilization: Chromium (17-19%), Nickel (9-12%), and Titanium (0.7%).

SS Seamless Tubes Grade 321: Specific Dimensions

While seamless tubes come in various sizes, the 19.3 mm diameter combined with a 0.9 mm wall thickness provides a specific balance of strength, precision, and lightweight properties.

The 19.3 mm diameter offers versatility, making it suitable for applications requiring medium-sized tubing with excellent flow characteristics.

A 0.9 mm thickness ensures the tube is lightweight but strong, ideal for applications where weight-saving is crucial, such as in aerospace or precision instruments.

SS seamless tubes must meet strict dimensional tolerances to ensure proper fit and function. For Grade 321, international standards such as ASTM A213 and ASTM A312 specify dimensional accuracy in diameter and wall thickness.

Key Advantages of SS Seamless Tubes with 19.3 mm Diameter

The precise 19.3 mm diameter allows for use in precision engineering applications, where accuracy is paramount.

This diameter offers a good balance between structural integrity and flow efficiency, making it a versatile choice in various industries.

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
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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