Stainless Steel Welded Pipes & Tubes Manufacturer and Supplier

Solitaire Overseas is a leading manufacturer and supplier of high-quality stainless steel welded pipes & stainless steel welded tubes. Our products are crafted from certified stainless steel and are known for their exceptional durability, corrosion resistance, and cost-effectiveness. By utilising advanced manufacturing techniques, we produce pipes that consistently meet and exceed international standards, ensuring reliable performance and a long service life across a wide range of industrial applications.

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What are Stainless Steel Welded Pipes & Tubes?

Stainless steel welded pipes and stainless steel welded tubes are crafted from stainless steel using various welding procedures. While they can be made in shapes like square, rectangular, and hexagonal, round pipes are the most common. These pipes are valued for their exceptional functionality and are produced in a range of grades, including 304, 309, 310, 316, 317, and 321. Due to their durability and long lifespan, they are often a preferred choice over seamless pipes. They offer greater flexibility in size and shape and require less concrete encasing during installation.

Stainless steel welded pipes are increasingly in demand due to their excellent corrosion resistance and robust features. They are commonly used in the oil and gas industry and in vehicle exhausts and mufflers. Compared to seamless pipes, welded pipes can have a thick wall, which is essential for large-diameter applications. Their primary advantages include cost-effectiveness and high corrosion resistance, a benefit derived from the chromium oxide layer on the steel. This layer protects the pipe from rust, pitting, and crevice corrosion, making it a reliable option for many demanding applications.

These pipes are known for their excellent thermal stability in high-temperature environments. Key features of stainless steel welded pipes include high tensile strength, a rugged and durable construction, precise dimensional accuracy, and superior surface finishes. They are also valued for their easy machinability and overall a strong finish, which contributes to their long-lasting performance in various settings.

Specification of Stainless Steel Welded Pipes
Manufacturing of Stainless Steel Welded Pipes
Types of Stainless Steel Welded Pipes
Application of Stainless Steel Welded Pipes

Specification of Stainless Steel Welded Pipes

Our SS welded pipes & tubes are available in a comprehensive range of specifications to meet diverse client needs.

Category	Specifications
Material Grades	TP304/304L, TP316/316L, TP317/317L, TP321/321H, TP347/347H, Duplex, Super Duplex, and more.
Standard	ASTM A312, ASTM A358, ASTM A778, ASTM A409, ASTM A928, EN 10217-7, and others.
Size Range	1/2" (15 NB) to 72" (1800 NB)
Wall Thickness	SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160
Length	Single Random, Double Random & Required Length
End Finish	Plain End, Beveled End
Surface Finish	Mill Finish (MF), Annealed and Pickled (AP), Bright Annealed (BA)

Chemical Composition & Mechanical Properties of Stainless Steel Welded Pipes and Tubes

Below are the standard property ranges for widely used austenitic stainless steel welded pipes and tubes. Exact figures may vary slightly and are verified through Mill Test Certificates (MTCs).

Typical Chemical Composition (wt%) of Common Austenitic Stainless Steels

Element	304L (UNS S30403) (%)	316L (UNS S31603) (%)
Carbon (C)	≤ 0.03	≤ 0.03
Chromium (Cr)	18.0 – 20.0	16.0 – 18.0
Nickel (Ni)	8.0 – 12.0	10.0 – 14.0
Molybdenum (Mo)	—	2.00 – 3.00
Manganese (Mn)	≤ 2.00	≤ 2.00
Silicon (Si)	≤ 0.75	≤ 0.75

Typical Mechanical Properties of Austenitic Stainless Steels

The table below highlights the general mechanical property ranges for commonly used austenitic stainless steel welded pipes and tubes. These values represent the minimum typical requirements as per industry standards.

Property	304L (Minimum Typical)	316L (Minimum Typical)
Tensile Strength	70 ksi (485 MPa)	70 ksi (485 MPa)
Yield Strength	25 ksi (170 MPa)	25 ksi (170 MPa)
Elongation (in 2")	40%	40%
Hardness	Rockwell B 90 / Brinell 187	Rockwell B 90 / Brinell 187

Dimensions, Wall Thickness, and Tolerances for Stainless Steel Welded Pipes & Tubes

Solitaire Overseas maintains strict dimensional accuracy across all its stainless steel welded pipes and tubes:

Parameter	Description
Outside Diameter & Wall Thickness (OD & WT)	Available in a wide range to meet diverse industrial and commercial requirements.
Tolerances	Manufactured according to ASTM standards, including A554 for mechanical/ornamental tubing and A999/A999M for general pipe requirements (A312).
Lengths	Standard 6-meter lengths, with custom cut-to-length options for efficient handling and reduced waste.

Stainless Steel Grades We Offer

We provide a wide range of stainless steel welded pipes and tubes to meet diverse industrial needs. Our most popular grades are selected for their corrosion resistance, high-temperature strength, and durability, making them ideal for applications in chemical processing, marine, power, and food industries.

Grade	Full Name	Key Features	Common Uses
304 / 304L	ASTM A312 TP304 / TP304L	Excellent corrosion resistance, easy to weld and form	Kitchen equipment, tanks, pipelines
316 / 316L	ASTM A312 TP316 / TP316L	Superior resistance to chlorides and acids	Marine, chemical processing, pharmaceuticals
316H	ASTM A312 TP316H	High-carbon version for high-temperature strength	Boilers, pressure vessels, heat exchangers
310 / 310S	ASTM A312 TP310 / TP310S	High-temperature and oxidation resistance	Furnaces, heat treatment, power plants
321 / 321H	ASTM A312 TP321 / TP321H	Stabilized with titanium, resists intergranular corrosion	Aerospace, exhaust systems
410	ASTM A312 TP410	Martensitic grade, good wear resistance, magnetic	Automotive, cutlery, industrial tools
317 / 317L	ASTM A312 TP317 / TP317L	High molybdenum content for better pitting resistance	Pulp and paper, chemical plants
310H / 310S	ASTM A312 TP310H / TP310S	Heat-resistant versions with excellent strength	Oil refining, power stations
JIS Grades (3459, 3468)	JIS G3459, G3468	Japanese standards, high strength and durability	Global pipeline projects, custom industrial applications

Manufacturing of Stainless Steel Welded Pipes & Tubes

Raw Material and Forming: The process begins with flat sheets or coils of certified stainless steel, which are cut to the required dimensions. These sheets are then progressively formed into a cylindrical shape using a series of rollers to create a clean, tight seam for welding.

Advanced Welding Techniques: The longitudinal seam is welded using specialized techniques to ensure strength and integrity. We use TIG (Tungsten Inert Gas) Welding for precise, high-quality welds; ERW (Electric Resistance Welding) for fast, efficient seams without filler metal; and EFW (Electric Fusion Welding) for large-diameter pipes requiring a continuous, robust weld.

Post-Welding Treatment: After welding, the pipes undergo a multi-stage finishing process. This includes heat treatment like annealing to relieve stress, followed by cleaning and passivation to enhance corrosion resistance. Finally, the pipes are subjected to rigorous tests, such as hydrostatic and non-destructive testing (NDT), to guarantee a defect-free product.

Types of Stainless Steel Welded Pipes & Tubes

The variety of stainless steel welded pipes & tubes is based on their manufacturing method and intended use.

Electric Fusion Welded (EFW) Pipes: These pipes are known for their exceptional strength and are the go-to choice for large-diameter and high-pressure applications. They are commonly used in the oil and gas industry, as well as for pipelines and high-capacity fluid transport.

Electric Resistance Welded (ERW) Pipes: Characterized by a clean and smooth finish, ERW pipes are highly suitable for general-purpose applications where a high-quality aesthetic is desired. They are often found in plumbing systems, general engineering, and some low-pressure fluid transport lines.

Fabricated Pipes: When standard sizes are not sufficient, fabricated pipes are custom-made from stainless steel plates. This allows for the production of very large diameters or unique shapes for specialized projects, offering flexibility in design and application.

Square & Rectangular Welded Tubes: Unlike circular pipes, these are primarily used for structural support, frameworks, or architectural features. Their flat surfaces and precise angles make them ideal for applications where a non-circular profile is required for both functional and aesthetic reasons.

Application of Stainless Steel Welded Pipes & Tubes

The versatility and durability of stainless steel welded pipes & tubes make them indispensable in a wide range of industries:

Oil & Gas: Transporting crude oil and natural gas in both offshore and onshore operations.
Chemical & Petrochemical: Handling corrosive chemicals and fluids.
Food & Beverage: Used in processing and transportation lines for sanitary and hygienic applications.
Power Generation: Components for heat exchangers and condensers in power plants.
Pulp & Paper: Resistant to the harsh chemicals used in the paper manufacturing process.
Water Treatment: For clean water and wastewater treatment facilities.

FAQ’s About Stainless Steel Welded Pipe & Tubes

What is stainless steel welded pipe?

A stainless steel welded pipe is made by rolling a flat stainless steel sheet into a tube and joining the edges using heat or pressure. It is strong, durable, and widely used for industrial, commercial, and plumbing applications.

Which is better, SS 304 or 316?

SS 304 is ideal for general corrosion resistance and cost-effective applications, while SS 316 offers superior resistance to chlorides and chemicals, making it better for marine, chemical, and high-corrosion environments.

Which is better, seamless or welded pipe?

Seamless pipes are stronger and ideal for high-pressure applications, whereas welded pipes are cost-effective, available in larger sizes, and suitable for moderate-pressure environments.