ERW (Electric Resistance Welded) pipes are known for their strength, cost-effectiveness, and versatility. They are commonly used in industries like oil and gas, construction, and water transmission. Understanding the key specifications of ERW pipes, such as outer diameter (OD), wall thickness (WT), and material grade, is crucial for selecting the right pipe for specific applications.
What Are ERW Pipes?
An ERW pipe (Electric Resistance Welded pipe) is a type of steel pipe produced by rolling metal strips or coils and welding them longitudinally along their length using electric resistance heat. The process involves passing an electrical current through the edges of the metal strip, heating it until the edges are hot enough to be welded together under pressure. This results in a pipe with a welded joint along its length. ERW pipes are commonly used in a variety of industries such as oil and gas, construction, and water transmission due to their strength, cost-effectiveness, and availability in different sizes (typically up to 24 inches in diameter).
ERW Pipe Specifications
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roducts
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ERW steel pipe
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Material
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Q195 = S195 / A53 Grade A
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Q235 = S235 / A53 Grade B / A500 Grade A / STK400 / SS400 / ST42.2
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Q355 = S355JR / A500 Grade B Grade C
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Surface Treatment
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1. Galvanized
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2. Black and color painting
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3. Transparent oil,anti-rust oil
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4. According to clients requirement
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Alloy Or Not
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Non-Alloy
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Size
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DN15-600mm
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Thickness
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2- 20 mm(accroding to the buyer's request)
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Length
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12m, 6m, 1-12m(accroding to the buyer's request)
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Standard
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ASTM A53, API 5L, ASTM A252, ASTM A795, ISO65, DIN2440, BS1387. BS1139, EN10255, EN39, JIS3444, GB/T 3091 & GB/T13793
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Certificate
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API, CE, BSI, JIS
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Pipe Ends
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Bevelled or plain ends.
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End Protection
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With or Without caps(accroding to the buyer's request)
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Packing
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Packed in bundles with nylon slings or piece by piece
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Application
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1.low pressure such as water, gas, alr, oil and steam and for machine structural purposes
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2. Fence, greenhouse, door pipe
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3. For both indoor and outdoor the building construction
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ERW Pipe Specification Size Table
Outer Diameter (OD): Determines the pipe’s flow capacity.
Wall Thickness (WT): Affects strength and pressure resistance.
Material Grade: Influences mechanical properties and suitability for different environments.
To give you a clearer understanding of the various sizes and specifications for ERW pipes, here's a typical ERW pipe specification size table:
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Outside Diameter
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Wall Thickness
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DN
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Inch
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mm
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mm
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15
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1/2"
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20~21.3
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0.95~2.77
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20
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3/4"
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25~26.9
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1.1~2.87
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25
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1"
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32~33.7
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1.1~4.0
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32
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11/4"
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40~42.4
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1.1~4.0
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40
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11/2"
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47~48.3
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1.5~7.0
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50
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2"
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58~60.3
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1.8~7.0
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65
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21/2"
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73~76.1
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2.0~7.0
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80
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3"
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87~88.9
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2.2~8.0
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90
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31/2"
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101.6~102.1
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2.2~9.0
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100
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4"
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113~114.3
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2.2~9.0
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125
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5"
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140~141.3
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2.5~10.0
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150
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6"
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165~168.3
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2.5~10.0
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200
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8"
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216~219.1
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2.75~12.0
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250
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10"
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272.8~273.2
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5.0~13.75
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300
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12"
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323.8~325
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5.5~13.75
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350
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14"
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355.6~356
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5.5~13.75
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400
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16"
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406~406.4
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5.75~13.75
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450
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18"
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457~457.2
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5.75~17.75
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500
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20"
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507.9~508.1
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5.75~17.75
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600
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24"
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609~610
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5.75~17.75
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Common ERW Pipe Grades
Different applications require different steel grades. Common ERW pipe grades include:
ASTM A53 Grade A & B
Widely used for water, steam, air, and gas pipelines. Grade B provides higher tensile strength than Grade A.
API 5L Grade B
Commonly used in oil and natural gas transportation systems.
ASTM A500 Grade B/C
Primarily used for structural steel tubing in buildings and bridges.
EN S235 / S275 / S355
European structural steel grades with different yield strengths.
How to Choose the Right ERW Pipe Specification？
When selecting an ERW pipe, consider the following:
Pressure Requirements: Choose pipes with appropriate wall thickness and material grade for high-pressure applications.
Corrosion Resistance: For harsh environments, select corrosion-resistant materials or coatings.
Regulatory Standards: Ensure the pipes meet relevant standards (e.g., API,
ASTM) for quality and reliability.
Pipe Fabrication: Verify if the ERW pipes can be fabricated (e.g., threading or bending) to meet your project needs.
Conclusion
ERW pipes are typically available in lengths of 6 meters, 12 meters, or custom-made to customer specifications. Specific lengths can be customized based on project and transportation requirements. ERW pipe specifications refer to the outer diameter, wall thickness, length, and corresponding standard parameters of resistance welded steel pipes (ERW Pipe). They are commonly classified according to standards such as DN, NPS, and Schedule, and are widely used in water transmission, oil and gas, and structural engineering fields.
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