SS 304 pipe is made by heating a solid round steel billet and then pushing or pulling it over a form to shape it into a hollow tube. These billets are sourced from both domestic and international suppliers. The types of pipes include Stainless Steel 304 Seamless Pipes, SS TP 304 Welded Pipes, ASTM A312 TP 304L Stainless Steel Pipes, and 304H Stainless Steel Pipes. Each type serves various applications with specific needs, such as seamless pipes for high-pressure uses and welded pipes for lower pressure systems. Solitaire Overseas is a manufacturer of 304L stainless steel pipes in India.
A seamless steel tube is produced from a round steel billet which is heated and pushed or pulled over a shape until the steel is cast into a hollow tube. The billets are purchased from local and foreign suppliers.
What are erw tubes?
Electric Resistance Welding (ERW) tube is made by wrapping the metal and then welding it longitudinally along its entire length. ERW tubing is longitudinally welded, fabricated from tape or coils, and can be fabricated up to 24 OD. ERW tube cold formed from a steel strip pulled through a series of rollers and formed into a tube which is melted by an electric charge. Common sizes for SS304 ERW TUBE range from 2 3/8 inches outside diameter to 24 inches outside diameter in a variety of lengths up to over 100 feet. Surface finishes are available in different formats and processing can be done on-site according to customer specifications.
What are seamless tubes?
The SS304 Seamless Tube is produced by extruding the metal to the desired length; so the ERW tube has a weld joint in its cross-section, while the seamless pipe has no joint in its cross-section along its entire length. Seamless pipe is finished to dimensional and wall thickness specifications in sizes ranging from 1/8 inch to 26 inches outside diameter. Applicable to high-pressure applications such as refineries in the hydrocarbon, oil and gas industries, Exploration & Drilling, Oil & Gas Transportation, and Air and Hydraulic cylinders, Bearings, Boilers, Automobiles.
What Technologies are used to manufacture Seamless & ERW Pipes
Seamless manufacturing technologies and ERW Pipes CPE technology used for the production of seamless pipes up to 7 inches outside diameter is the world-famous technology. “Plug Mill” Technology used for Higher Dia.
Seamless Tubes The production of tubes from 7 to 14 is the most reliable technology, in larger diameters.
Segment High-frequency Induction Welding Technology is used for ERW Pipes &Tubes up to 21-inches.
How to Identify Seamless or ERW Stainless Steel Pipes
Identifying whether a stainless steel pipe is seamless or ERW (Electric Resistance Welded) is straightforward. Simply the read the Seamless or ERW Stainless Steel Pipes
ASTM A53, Type S indicates the pipe is seamless.
Type F means the pipe is a furnace but welded.
Type E denotes electrical resistance welded (ERW).
Seamless pipes are often marketed on the outdated belief that they are free of flaws, while welded pipes are perceived to have inherent flaws along their length. This misconception is easily accepted by those with limited experience in pipe products. However, each type of pipe has its own set of potential issues and defects, depending on the manufacturing process.
The seamless pipes will not have tracks or joints of welding even on the inside of the pipes. There can be a difference seen in the welded pipes that identify the welded joint. Some markings verify if the pipe is seamless or erw.
Different application types use different types of pipes. Both the pipes come in various sizes but the erw pipes can be produced in larger diameters than the drawn seamless pipes.
Consumers need to understand these potential problems and how they might impact specific applications. Making an informed decision based on facts, rather than myths, is crucial.
For more insight, watch a video on the ERW stainless steel manufacturing process.
Solitaire Overseas is one of the leading manufacturers and exporters of ERW Stainless Steel pipes from India. We manufacture ERW steel pipes in various dimensions and shapes. We are also one of the largest Stainless Steel pipes exporter from India.
Conclusion
If you require high strength, precision, and durability, SS304 Seamless Tubes are the better choice. However, if cost-effectiveness and standard strength are the priorities, SS304 ERW Tubes are a more practical option.
FAQ
What is SS 304 pipe grade?
SS 304 pipes, also known as Type 304 stainless steel pipes, are known for their high strength, with a minimum yield strength of 205 MPa and a tensile strength of 515 MPa. They are available in various shapes, such as round, square, and rectangular, and can be manufactured as seamless, welded, and other forms. This grade is widely used for its durability and resistance to corrosion.
How to identify 304 stainless steel?
To identify 304 stainless steel, you can use a grinder test. When grinding 304 stainless steel, it produces thin reddish-orange sparks that continue for a longer duration due to its higher nickel content. In contrast, grade 202 stainless steel produces thicker yellow sparks.
What are the common sizes of SS304 seamless and ERW tubes?
SS304 seamless and ERW tubes are manufactured in a broad spectrum of sizes to suit diverse applications. While custom sizes can often be produced, some common ranges exist. SS304 seamless tubes, frequently chosen for high-pressure and critical applications, typically range from 1/8 inch (approximately 3.2 mm) up to 26 inches (approximately 660 mm) in outer diameter (OD). Wall thickness varies considerably based on the OD and intended pressure service. Lengths are typically random, though fixed lengths are available. SS304 ERW tubes, often preferred for general-purpose and cost-sensitive applications, commonly range from 2 3/8 inches (approximately 60 mm) to 24 inches (approximately 610 mm) in OD, although larger sizes are technically feasible but less common. Wall thickness also varies but often tends to be less than comparable seamless tubes, especially in larger diameters.
How do I choose between seamless and ERW SS304 for my application?
If your application demands high pressure resistance, operation in a highly corrosive environment, or requires extremely high reliability, seamless SS304 is usually the better choice. If cost is a primary concern and the application is less demanding, ERW SS304 can be a viable and economical alternative.
What are the different types of surface finishes available for SS304 tubes?
SS304 stainless steel tubes come in various surface finishes. Common mill finishes include 1D (rough), 2B (smooth, bright), and 2D (dull, matte). Mechanically polished finishes range from No. 3 (coarse) to No. 8 (mirror). Patterned finishes can be embossed or textured. Colored finishes are achieved through oxidation, painting, or coating. Other options include bead blasting, electropolishing, and passivation.
