ERW vs seamless pipe cost

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Seamless steel pipes are made of steel ingots or solid tube billets through perforation into capillary tubes, and then made by hot rolling, cold rolling or cold drawing. Seamless steel pipes have a hollow cross-section and are used in large quantities as pipes for conveying fluids. Welded pipe refers to a steel pipe with seams on the surface that is welded after bending and deforming a steel strip or steel plate into a round shape.

ERW steel pipe refers to a steel pipe with seams on the surface that is welded after bending and deforming a steel strip or steel plate into a round shape. The billet used for welded pipe is steel plate or strip steel. Generally, the length is 6 meters, and the strength is lower than that of seamless steel pipes.

1. Process difference:
Seamless steel pipe: hot-rolled forming process is adopted. The raw material composition of the steel pipe, the cooling condition and the cooling state of the roll have a great influence on its outer diameter, so it is difficult to accurately control the outer diameter and has a large fluctuation range. Seamless steel pipes are mainly divided into hot-rolled seamless pipes and cold-drawn seamless pipes. Hot-rolled pipes are forged, pierced, rolled, and shaped. Generally, large-diameter and thick-walled seamless pipes adopt this form; cold-drawn pipes are formed by cold-drawn pipe blanks. The material strength is relatively low, and the external and internal control surfaces are smooth. Thin-walled seamless pipes are mostly in this form.

ERW steel pipe: It adopts cold-formed, high-frequency welding, and the sizing is completed by 0.6% reduction. The process temperature is basically constant at room temperature, so the outer diameter is controlled accurately and the fluctuation range is small.

2.Different prices:
The price of seamless steel pipes of the same specification is generally about 30% higher than that of welded pipes, and the difference between large diameters is even greater.

ERW is a high-frequency welded pipe, which is made of strip steel and has a lower cost.
The seamless steel pipe is made by heating and perforating a tube blank. The production process is more complicated and the cost is higher!

3.Different pressure-bearing capacity:
The pressure of seamless pipes is higher. Welded pipes are generally around 10 MPa. Now welded pipes are also seamlessly treated.

Seamless steel pipe: hot-rolled forming process is adopted. The raw material composition of the steel pipe, the cooling condition and the cooling state of the roll have a great influence on its outer diameter, so it is difficult to accurately control the outer diameter and has a large fluctuation range. Seamless steel pipes are mainly divided into hot-rolled seamless pipes and cold-drawn seamless pipes. Hot-rolled pipes are forged, pierced, rolled, and shaped. Generally, large-diameter and thick-walled seamless pipes adopt this form; cold-drawn pipes are formed by cold-drawn pipe blanks. The material strength is relatively low, and the external and internal control surfaces are smooth. Thin-walled seamless pipes are mostly in this form.ERW steel pipe: It adopts cold-formed, high-frequency welding, and the sizing is completed by 0.6% reduction. The process temperature is basically constant at room temperature, so the outer diameter is controlled accurately and the fluctuation range is small.The price of seamless steel pipes of the same specification is generally about 30% higher than that of welded pipes, and the difference between large diameters is even greater.ERW is a high-frequency welded pipe, which is made of strip steel and has a lower cost.The seamless steel pipe is made by heating and perforating a tube blank. The production process is more complicated and the cost is higher!The pressure of seamless pipes is higher. Welded pipes are generally around 10 MPa. Now welded pipes are also seamlessly treated.

Seamless Pipe vs ERW Pipe Cost

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1. Different production processes

The seamless steel pipe is a steel pipe perforated from a whole round steel without welds on the surface.

ERW steel pipe refers to a steel pipe that is bent and deformed into a round shape by a steel strip or a steel plate, and then welded to a steel pipe with seams on the surface. The welding method of ERW steel pipe is high-frequency induction heating, which uses high-frequency induction current to heat the edge of the formed coil, and uses squeeze rollers for extrusion welding.

Seamless steel pipe is a steel that is perforated from a whole round steel and has no welds on the surface. The seamless steel pipe has a hollow section and is widely used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. ERW steel pipe " is Electric Resistance Welding, abbreviated as ERW. It is used to transport oil, natural gas and other vapor and liquid objects. It can meet various requirements of high and low pressure. It currently plays a pivotal role in the field of transportation pipes in the world.The seamless steel pipe is a steel pipe perforated from a whole round steel without welds on the surface.ERW steel pipe refers to a steel pipe that is bent and deformed into a round shape by a steel strip or a steel plate, and then welded to a steel pipe with seams on the surface. The welding method of ERW steel pipe is high-frequency induction heating, which uses high-frequency induction current to heat the edge of the formed coil, and uses squeeze rollers for extrusion welding.

2. Different prices

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The price of seamless steel pipe is more expensive than ERW steel pipe and the quality is better. The price of seamless steel pipes of the same specification is generally about 30% higher than that of welded pipes, and the price difference for large diameters is even greater. The required stress of seamless steel pipes can be much higher, and welded steel pipes are generally about 10Mpa, so seamless steel pipes are more expensive.

The price of seamless steel pipe is more expensive than ERW steel pipe and the quality is better. The price of seamless steel pipes of the same specification is generally about 30% higher than that of welded pipes, and the price difference for large diameters is even greater. The required stress of seamless steel pipes can be much higher, and welded steel pipes are generally about 10Mpa, so seamless steel pipes are more expensive.

3. Different application scope

Seamless steel pipes: general-purpose seamless steel pipes are rolled from ordinary carbon structural steel, low-alloy structural steel or alloy structural steel, and have the largest output. They are mainly used as pipelines for conveying fluids or manufacturing structural parts and mechanical parts, such as oil drills. Rods, automobile drive shafts, bicycle frames, and steel scaffolds used in building construction are made of steel pipes to make ring parts, which can improve material utilization, simplify manufacturing procedures, and save materials and processing man-hours.

ERW steel pipe: ERW longitudinally welded pipe is mainly used in water supply engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, and urban construction. For liquid transportation: water supply and drainage. For gas transportation: coal gas, steam, liquefied petroleum gas. For structural purposes: as piling pipes and bridges; pipes for docks, roads, and building structures.

ERW straight seam welded pipes are generally used as wire casings in the power industry. Performance characteristics: 100% ultrasonic testing of the base material to ensure the internal quality of the pipe body; no uncoiling-disc shearing process, base material pressure pit , Less scratches; After the stress is eliminated, the finished pipe basically has no residual stress; the weld seam is short, and the probability of defects is small; it can conditionally transport the moist sour natural gas; After the diameter is expanded, the geometrical size of the steel pipe is high; welding It is carried out in a straight line in the horizontal position after the forming is completed. Therefore, the control of staggered edges, slits, pipe diameter and circumference is better, and the welding quality is excellent.

Seamless steel pipes: general-purpose seamless steel pipes are rolled from ordinary carbon structural steel, low-alloy structural steel or alloy structural steel, and have the largest output. They are mainly used as pipelines for conveying fluids or manufacturing structural parts and mechanical parts, such as oil drills. Rods, automobile drive shafts, bicycle frames, and steel scaffolds used in building construction are made of steel pipes to make ring parts, which can improve material utilization, simplify manufacturing procedures, and save materials and processing man-hours.ERW steel pipe: ERW longitudinally welded pipe is mainly used in water supply engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, and urban construction. For liquid transportation: water supply and drainage. For gas transportation: coal gas, steam, liquefied petroleum gas. For structural purposes: as piling pipes and bridges; pipes for docks, roads, and building structures.ERW straight seam welded pipes are generally used as wire casings in the power industry. Performance characteristics: 100% ultrasonic testing of the base material to ensure the internal quality of the pipe body; no uncoiling-disc shearing process, base material pressure pit , Less scratches; After the stress is eliminated, the finished pipe basically has no residual stress; the weld seam is short, and the probability of defects is small; it can conditionally transport the moist sour natural gas; After the diameter is expanded, the geometrical size of the steel pipe is high; welding It is carried out in a straight line in the horizontal position after the forming is completed. Therefore, the control of staggered edges, slits, pipe diameter and circumference is better, and the welding quality is excellent.

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