SS welded pipes grade Super Duplex Diameter 114.3 mm X Sch 10

SS welded pipes grade Super Duplex Diameter 114.3 mm X Sch 10,Suppliers & Exporters in India.

Super Duplex Stainless Steel (SDSS) is an advanced alloy known for its excellent corrosion resistance and high strength. It combines the properties of both austenitic and ferritic stainless steels, making it suitable for demanding environments. The unique microstructure of Super Duplex allows it to perform exceptionally well in both acidic and chloride-rich conditions.

SS seamless Tubes
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What is Super Duplex Stainless Steel?

Super Duplex Stainless Steel (SDSS) is a hybrid alloy combining the best features of both austenitic and ferritic stainless steels. It typically contains a higher chromium (around 25%) and molybdenum (around 4-7%) content, resulting in enhanced resistance to corrosion, particularly in environments containing chlorides. The dual-phase structure (approximately 50% austenite and 50% ferrite) gives SDSS its exceptional mechanical properties.

Properties of Super Duplex Stainless Steel

  • Corrosion Resistance: Exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking. This makes it suitable for aggressive environments.
  • High Strength:Super Duplex possesses a high tensile strength, allowing it to withstand significant pressure, which is critical in oil and gas applications.
  • Impact Toughness: Maintains toughness at low temperatures, ensuring performance in harsh conditions.
  • Thermal Conductivity: Good thermal conductivity properties, making it effective for heat exchangers and thermal management systems.

Specifications: Diameter and Schedule

  • Diameter (114.3 mm): This measurement refers to the outer diameter of the pipe, a crucial factor in determining flow rates and fitting compatibility in various applications.
  • Schedule 10 (Sch 10):The wall thickness for Schedule 10 is relatively thin, which contributes to a lightweight construction while still providing sufficient strength for low-pressure applications. It is commonly used in systems where weight reduction is necessary, such as offshore platforms.

Manufacturing Process of Welded Pipes

The production of SS seamless welded pipes typically involves the following steps:

  • Billet Preparation: Starting with a solid steel billet, it is heated to a temperature above its recrystallization point.
  • Piercing:The heated billet is pierced to create a hollow tube.
  • Elongation: The hollow tube is then elongated and reduced in diameter through a series of rollers.
  • Heat Treatment: Pipes undergo heat treatment to relieve stresses and enhance mechanical properties.
  • Finishing: The pipes are cut to length, and surface finishes are applied based on customer requirements.

Standards and Certifications

Pipes made from Super Duplex stainless steel should comply with various international standards, including:

  • ASTM A789/A790: These standards cover seamless and welded austenitic/ferritic stainless steel pipes for general corrosion-resistant applications.
  • ISO 9001: Quality management system standard ensuring consistent product quality.
  • NACE MR0175/ISO 15156: Specifications for materials used in H2S-containing environments.

Applications of Super Duplex SS Welded Pipes

  • Oil and Gas Exploration: Utilized in drilling operations and piping systems that require high strength and resistance to corrosive environments.
  • Chemical Processing Plants: Essential for transporting chemicals, where resistance to corrosive agents is critical.
  • Desalination Plants: Used in seawater intake and outfall piping due to its ability to withstand seawater corrosion.
  • Pharmaceutical Industry:Ideal for equipment and piping systems that require strict hygiene and corrosion resistance.
  • Pulp and Paper Industry: Effective in handling aggressive chemicals used in pulp processing.

Advantages of SS Welded Pipes

  • Reduced Risk of Leaks: Seamless pipes eliminate the weaknesses associated with welded joints, reducing the risk of leaks and failures.
  • Increased Flow Efficiency: The absence of seams means smoother internal surfaces, which can enhance flow rates and reduce pressure drops.
  • Lower Maintenance Costs: High durability and resistance to wear and corrosion translate to lower maintenance needs over the lifespan of the pipe.
  • Environmental Benefits: Their longevity and resilience lead to reduced replacement and disposal rates, contributing to a more sustainable approach.

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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