What is Stainless Steel Welded Pipe?

Stainless Steel Welded Pipe is a type of pipe that is made from stainless steel strips or plates and produced by welding process. There are two main welding methods for manufacturing stainless steel welded pipes: Electric Resistance Welding (ERW) and Electric Fusion Welding (EFW).

ERW is commonly used for producing small diameter pipes. The process involves passing an electric current through the edges of stainless steel strip, heating them to a welding temperature and pressing them together by rolls to form a bonded seam.

EFW is suitable for large diameter pipes. In this process, the edges of steel plates are heated up by an electric arc and then forged together to create a high-quality welded seam.

Compared with seamless pipes, welded pipes offer several advantages such as cost-effectiveness, shorter production cycle, flexibility in sizes and specifications. They are particularly suitable for large diameter pipe applications where seamless pipes are limited.

Stainless Steel Welded Pipe Specifications

Wenzhou Longxiang Steel Pipe Manufacturing Co., Ltd. produces stainless steel welded pipes in accordance with various international and industrial standards, including ASTM A312, A249, A213, A268, A269, A270, A778. We can manufacture pipes in a wide range of grades, sizes, lengths, shapes, and finishes to meet different application requirements.

1. Grades:

- 300 series: 304, 304L, 304H, 316, 316L, 316Ti, 321, 347

- 400 series: 409L, 410, 416, 410S, 430

- Duplex stainless steel: 2205, UNS31803

- Other grades: 310S, 317, 347H  

2. Size range:

- Outside Diameter: 1/8" NB to 36" NB (6mm to 630mm)

- Wall Thickness: 0.5mm to 40mm, SCH5S to SCH160S

3. Length: Single Random, Double Random & Cut Length

4. Shape: Round, Square, Rectangular

5. Surface finish: No.1 Pickled Finish, No.4 finish, BA Finish, Electropolished

6. End types: Plain End, Beveled End, Threaded

In addition to standard specifications, we can also produce pipes according to customers' specific requirements. Our experienced engineers and advanced manufacturing equipments enable us to meet the most demanding specifications while ensuring product quality and consistency.

Stainless Steel Welded Pipe Production Process

At Wenzhou Longxiang Steel Pipe Manufacturing Co., Ltd., we utilize advanced production technologies and strict quality control measures to ensure that every piece of stainless steel welded pipe meets the highest quality standards.

Our main production processes include:

1. Electric Resistance Welding (ERW) for small diameter pipes

- High frequency welding enables high production efficiency

- Precise control of welding parameters ensures consistent weld quality

2. Electric Fusion Welding (EFW) for large diameter pipes

- High-power electric arc generates sufficient heat for full penetration welding

- Heavy-duty welding machine produces high-strength welded seams

Throughout the production process, we carry out strict quality inspections, including:

- Mechanical properties testing

- Ultrasonic Testing (UT)

- Eddy Current Testing (ECT) for detecting surface defects

- Hydrostatic pressure testing

- Chemical composition analysis by advanced spectroscopes

Our unremitting pursuit of quality and innovation has made us one of the most trusted stainless steel welded pipe suppliers in the industry. Customers worldwide rely on our products for their critical applications.

Main Features of Stainless Steel Welded Pipe

Stainless steel welded pipes possess excellent properties that make them ideal choices for various applications. The main features include:

1. Superior Corrosion Resistance:

The chromium content in stainless steel forms a self-healing protective layer on the surface, making the pipes highly resistant to corrosion caused by most chemicals, acids, alkalis, and other corrosive media. This feature enables long service life and low maintenance costs.

2. High and Low Temperature Resistance:

Stainless steel maintains good mechanical properties over a wide range of temperatures. It can withstand high temperatures up to 1100°C and cryogenic temperatures down to -196°C. This makes stainless steel welded pipes suitable for applications involving extreme temperature conditions.

3. Excellent Mechanical Properties:

Stainless steel has high strength, good ductility, and excellent toughness. Welded pipes made from stainless steel can withstand high pressures, heavy loads, and severe impact without failure. The good fatigue resistance also enables pipes to endure cyclic stresses.

4. Smooth Surface Finish:

Our advanced production lines equipped with high-precision forming and sizing units ensure that the pipes have smooth inner and outer surfaces. The smooth surface reduces flow resistance, prevents scale buildup, and facilitates cleaning.

5. Clean and Hygienic:

Stainless steel is non-toxic, non-contaminating, and easy to clean and sterilize. Welded pipes with smooth surfaces and minimal crevices minimize the risk of bacterial growth, making them ideal for hygienic applications such as food and pharmaceutical industries.

6. Easy Fabrication:

Stainless steel welded pipes are easy to cut, bend, form, and weld. They can be readily fabricated into various shapes and sizes to suit specific application needs. The good weldability allows for easy assembly and installation on site.

With these outstanding features, our stainless steel welded pipes provide reliable and long-lasting solutions for a wide spectrum of industrial applications.

Stainless Steel Welded Pipe Applications

Stainless steel welded pipes find extensive applications across various industries due to their excellent corrosion resistance, high strength, and good formability. Some of the key application areas include:

1. Chemical and Petrochemical Industries:

- Transportation of corrosive fluids and gases

- Process piping systems

- Heat exchangers and condensers

2. Food and Beverage Processing:

- Hygienic pipelines for liquid food and beverages

- Dairy equipment and brewery systems

- Food processing and packaging machines  

3. Pharmaceutical and Biotech Industries:

- High-purity process piping

- Clean-in-place (CIP) systems

- Bioreactors and fermenters

4. Pulp and Paper Mills:

- Pulping and bleaching process piping  

- Chemical recovery systems

- Wastewater treatment facilities

5. Power Generation Plants:

- Boiler tubes and heat exchanger tubes

- Condensate and feedwater piping

- Flue gas desulfurization systems

6. Water and Wastewater Treatment:

- Potable water distribution pipelines

- Desalination plant piping

- Sewage collection and treatment systems

7. Oil and Gas Industry:

- Offshore platform piping  

- Refinery and petrochemical plant piping

- Natural gas distribution pipelines  

8. Automotive Industry:

- Exhaust tubing and mufflers

- Fuel injection lines

- Decorative trims and accessories

9. Architecture and Construction:

- Structural pipes for buildings and bridges

- Handrails and balusters

- Decorative pipes for facades and interiors

10. Other Applications:

- Marine engineering and shipbuilding

- Mining and mineral processing

- Textile machinery and equipment

With our extensive production capabilities and deep understanding of various industrial applications, we are able to provide the most suitable stainless steel welded pipe solutions to customers worldwide. Our high-quality products have been extensively used in these fields and proven their outstanding performance and reliability.

Value-added Services

At Wenzhou Longxiang Steel Pipe Manufacturing Co., Ltd., we are committed to providing customers with comprehensive solutions and value-added services to meet their specific needs. In addition to high-quality products, we offer the following services:

1. Customized Manufacturing:

We can produce stainless steel welded pipes according to customers' drawings, samples, or special requirements in terms of grade, size, tolerance, surface treatment, and testing. Our flexible manufacturing system enables us to handle small or large quantities with short lead times.

2. Secondary Processing:

To help customers save time and cost, we can perform various secondary operations on the pipes before shipping, such as:

- Beveling: Weld end preparation for easy on-site welding

- Heat treatment: Annealing, solution treatment, and stress relieving

- Polishing: Mechanical polishing or electropolishing for improved surface finish

- Cutting: Cut to fixed lengths or random lengths as required

- End finishing: Plain end, threaded end, or flange end

3. Marking and Packing:

We can mark the pipes with customer-specified information such as heat number, size, grade, and standard using laser marking, stenciling, or ink-jet printing. The pipes are properly packed in wooden boxes, bundles, or according to customer's packing instructions to ensure safe transportation.

4. Quality Assurance:

We have a strict quality management system in accordance with ISO 9001 standard. Every batch of products undergoes rigorous testing and inspection before shipment. Test certificates such as mill test report (MTC), material test report (MTR), and inspection test report (ITR) are provided with each order.  

5. Technical Support:

Our experienced technical team is always ready to provide professional advice and support to customers. From material selection, design optimization, to installation guidance and after-sales service, we strive to help customers solve their problems and achieve the best results.

6. Timely Delivery:

With our strategic location and well-established logistics network, we can deliver products to customers worldwide in a timely and efficient manner. We work with reliable shipping companies and freight forwarders to ensure on-time delivery and door-to-door service.

By providing these value-added services, we aim to be a one-stop solution provider for customers' stainless steel welded pipe needs. Our ultimate goal is to build long-term partnerships with customers based on trust, reliability, and mutual success.