SS welded pipes grade Super Duplex Diameter 88.9 mm X Sch 10

SS welded pipes grade Super Duplex Diameter 88.9 mm X Sch 10,Suppliers & Exporters in India.

Super Duplex stainless steel have emerged as a preferred choice due to their exceptional strength, corrosion resistance, and versatility. This guide delves into the specifications and advantages of Super Duplex seamless welded pipes, particularly focusing on the 88.9 mm diameter and Schedule 10.

Understanding Super Duplex Stainless Steel Super Duplex stainless steel is a category of stainless steel that boasts a dual-phase microstructure, combining both austenitic and ferritic properties. This unique composition provides superior mechanical strength and resistance to pitting and stress corrosion cracking, making it ideal for challenging environments such as oil and gas, chemical processing, and marine applications.

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Key Specifications

  • Diameter:88.9 mm
  • Schedule:10
  • Material Grade: Super Duplex (commonly ASTM A790/A789)

These pipes are designed for high-pressure applications, and the Schedule 10 designation indicates a wall thickness that balances strength and weight, making them suitable for various installations.

Advantages of SS Welded Pipes

  • Corrosion Resistance: The Super Duplex grade offers remarkable resistance to chloride-induced stress corrosion cracking, making these pipes ideal for offshore and coastal applications.
  • Strength and Durability: The dual-phase structure contributes to a high yield strength, allowing these pipes to withstand extreme pressures and mechanical stresses.
  • Weldability:Seamless welded pipes facilitate easier welding and fabrication processes, ensuring strong joints and reliable performance in critical applications.
  • Versatility: These pipes are suitable for various industries, including oil and gas, water treatment, and chemical manufacturing, providing reliable solutions for diverse applications.

What is Super Duplex Stainless Steel?

Super Duplex stainless steel is an advanced alloy known for its high chromium (around 25%) and molybdenum (about 4%) content, along with a balanced nitrogen level. This unique composition gives it outstanding corrosion resistance, particularly in chloride environments, as well as superior mechanical properties. The dual-phase microstructure (approximately 50% austenite and 50% ferrite) ensures enhanced strength and toughness

Key Specifications

  • Diameter: 88.9 mm (3.5 inches)
  • Schedule:10 (which indicates a specific wall thickness)
  • Material Grade: Super Duplex, typically conforming to ASTM A790/A789 standards
  • Typical Wall Thickness: Approximately 5.56 mm

Manufacturing Process

  • Billet Preparation: The manufacturing process begins with the preparation of high-quality steel billets.
  • Extrusion/Hot Working: The billets are then heated and extruded into the desired pipe shape, maintaining the material's integrity.
  • Cold Working:: Post-extrusion, the pipes undergo cold working processes to refine their dimensions and mechanical properties.
  • Heat Treatment: Pipes are subjected to heat treatment to optimize their microstructure and enhance corrosion resistance.
  • Testing and Inspection: Rigorous testing, including non-destructive testing (NDT) methods, ensures that the pipes meet industry standards and specifications.

Advantages of SS Seamless Welded Pipes

  • Exceptional Corrosion Resistance:: Super Duplex pipes can withstand harsh environments, making them ideal for applications exposed to saltwater, acids, and chlorides.
  • High Strength-to-Weight Ratio: Their high yield strength allows for thinner walls without compromising performance, making them lighter and easier to handle.
  • Weldability and Fabricability: The seamless nature allows for uniform wall thickness and better weldability, reducing the risk of defects in welded joints.
  • Temperature Resistance: They maintain their strength and corrosion resistance in high-temperature environments, making them suitable for a range of applications.
  • Sustainability:: Super Duplex stainless steel is 100% recyclable, contributing to environmentally sustainable practices in industrial sectors.

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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