SS welded tubes grade 347 Diameter 13.7mm X 1.2 mm thickness

SS welded tubes grade 347 Diameter 13.7mm X 1.2 mm thickness, Suppliers & Exporters in India.

When it comes to industrial tubing, particularly for high-temperature applications, stainless steel welded tubes play a vital role. Among the numerous available grades, SS 347 has emerged as a top choice for its remarkable properties, which include excellent corrosion resistance and heat tolerance. The SS 347 grade is specifically designed for harsh environments and is frequently used in industries where durability under extreme conditions is paramount.

Welded tubes, which lack any welds or joints, offer superior strength and reliability compared to their welded counterparts. In this article, we’ll explore the specific application of SS 347 seamless tubes with a diameter of 13.7mm and thickness of 1.2mm, uncovering why these dimensions are crucial for certain industrial applications and how they outperform other materials.

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What Makes SS 347 a Special Grade?

SS 347 is particularly suited for prolonged exposure to high heat, resisting scaling and oxidation better than many other grades, including SS 304 and SS 316. It's also more resistant to intergranular corrosion, making it a go-to choice for industries like aerospace and chemical processing.

Composition of SS 347

The alloy composition of SS 347 includes:

  • Chromium (17-20%): Provides corrosion resistance.
  • Nickel (9-13%):Improves durability and resistance to oxidizing environments.
  • Niobium:Stabilizes the material and prevents carbide precipitation.
  • Carbon (max 0.08%): Small amount to improve hardness and strength without compromising weldability.

This specific chemical makeup makes SS 347 an excellent material for industries that deal with aggressive chemicals and high heat.

Benefits of SS 347 in High-Temperature Applications

One of the standout benefits of SS 347 is its resistance to oxidation and corrosion even at temperatures up to 1500°F (815°C). The material doesn't lose its structural integrity easily, making it an ideal choice for:

  • Heat exchangers
  • Boilers
  • Pressure vessels: These benefits ensure that the seamless tubes made from SS 347 continue to function effectively, even in demanding industrial environments where other metals might fail.

Overview of SS Welded Tubes

Welded tubes are manufactured without any joints or welds, offering higher structural integrity compared to welded tubes. This makes seamless tubes more resistant to pressure and mechanical stress, key factors in environments like chemical plants, aerospace, and oil and gas pipelines.

Diameter 13.7mm and 1.2mm Thickness: Why the Specific Dimensions Matter

The 13.7mm diameter and 1.2mm thickness are particularly important for applications requiring:

  • High precision and reliability:The small diameter ensures the tubes can be used in intricate systems like heat exchangers.
  • Flexibility without compromising strength: The 1.2mm wall thickness provides the necessary durability while maintaining flexibility in high-pressure environments. These dimensions are favored in industries where space constraints and performance under pressure are non-negotiable.

Applications of SS 347 Welded Tubes

SS 347 welded tubes are used across various industries due to their high strength, durability, and resistance to harsh environments. Some key industries include:

  • Aerospace and Aviation:For exhaust manifolds, afterburners, and other high-temperature components.
  • Chemical Processing: Ideal for heat exchangers, process pipes, and reaction vessels.
  • Power Generation: Utilized in boilers and superheater tubing in power plants.
  • Oil and Gas: Commonly used in refining processes and offshore platforms where corrosion resistance is crucial.

Advantages of Using SS 347 Welded Tubes in Industrial Projects

SS 347 offers numerous advantages over other stainless steel grades:

  • Long-Term Performance: The high resistance to heat and corrosion ensures that these tubes last longer in extreme conditions.
  • Minimal Maintenance: The material is inherently durable and resistant to oxidation, which reduces the frequency of maintenance.
  • Cost-Efficiency: While the initial investment may be higher, the reduced need for replacement and repairs makes SS 347 seamless tubes a cost-effective solution.

Stainless Steel Pipes Dimension – (S.S. Pipes)

Stainless Steel Pipes Dimension – (S.S. Pipes)
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.

Mechanical Properties

MECHANICAL PROPERTIES
Grade Tensile Strength
Mpa, (Min)		 Yield Strength
Mpa, (Min)		 %Age Elongation
in 50mm gauge
length min		 Hardness (Max)
BHN Rb
301 515 205 40 217 95
304 515 205 40 201 92
304L 485 170 40 201 92
310S 515 205 40 217 95
316 515 205 40 217 95
316L 485 170 40 217 95
317 515 205 35 217 95
317L 515 205 40 217 95
321 515 205 40 217 95
347 515 205 40 201 92
409 380 170 20 179 88
409M 430 275 20 187 90
410S 415 205 22 183 89
410 450 205 20 217 89
420 700( max ) – 15 217 95
430 450 205 22 183 89
JSL AUS 515 205 40 217 95
JS- 203 515 205 40 217 95
301M 515 205 40 217 95


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