Round Steel Tube
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ERW Round Steel Tube

Electric resistance welded pipe

Our ERW round steel pipes are longitudinally welded pipes that are manufactured by forming steel strip into hollow shape, and then welded along the length of the steel pipe. Through the high-frequency electric resistance welding (ERW) process, this type of round steel pipes yields strong joints due to the heat from the electric current can deeply penetrate the metal material. This makes the steel pipe durable and highly customizable, having a wide variety of structural, architectural and construction applications.

As an expert manufacturer of ERW longitudinally welded pipes, we supply custom round steel pipes that are available in a wide range of sizes, such as 21.3mm to 609.6mm in outside diameter and 0.8mm to 17.5mm in wall thickness. Besides, we can also provide ERW carbon steel pipes to satisfy your applications requiring capability of withstanding high pressure.

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Standard

  • ASTM A53
  • ASTM A500
  • API 5L
  • ASTM A795
  • IS065
  • BS1387. BS1139,
  • GBT 3091 & GB/T13793

Applications

  • Structural Pipe/ Structural Tubing
  • Pipe Railing
  • Scaffolding Pipe
  • Fire Fighting Pipe
  • Greenhouse Pipe
  • Low Pressure Liquid Delivery Pipe

Size

  • Outside Diameter: 21.3mm to 609.6mm
  • Wall Thickness: 0.8mm to 17.5mm
  • Regular Length: 5.8m or 6m or 12m
  • Custom Cut-to-Length: 3m to 12m
Surface Finish
Pipe End
  • ERW Round Steel Tube Plain End
  • ERW Round Steel Tube Beveled End
  • ERW Round Steel Tube Grooved End
  • ERW Round Steel Tube Threaded End
Specifications
BS 1387-85 XL
BS 1387-85L
BS 1387-85 M
ASTM A53 GRADE A SCH40
British Standards: BS 1387-85 XL
DN Designation of Thread Outside Diameter Wall Thickness
(mm) (inch) (mm) (inch)
15 1/2 21.40-21.00 0.843-0.827 1.80 0.071
20 3/4' 26.90-26.40 1.059-1.039 2.00 0.079
25 1' 33.80-33.20 1.331-1.307 2.00 0.079
32 1-1/4' 4250-41.90 1673-1.650 2.00 0.079
40 1-1/2' 48.40-47.80 1.906-1.882 2.3 0.091
50 2' 60.20-59.60 2.370-2.346 2.30 0.091
65 2-1/2' 76.00-7520 2.992-2.961 2.60 0.102
80 3' 88.70-87.90 3.492-3.461 2.60 0.102
100 4' 113.90-113.00 4.484-4.449 3.20 0.126
British Standards: BS 1387-85L
DN Designation of Thread Outside Diameter Wall Thickness
(mm) (inch) (mm) (inch)
15 1/2' 21.40-21.00 0.843-0.827 2.00 0.079
20 3/4' 26.90-26.40 1.059-1.039 2.30 0.091
25 1' 33.80-33.20 1.331-1.307 2.60 0.102
32 1-1/4' 4250-41.90 1.673-1.65 2.60 0.102
40 1-1/2' 48.40-47.80 1.906-1.882 2.90 0.11
50 2' 60.20-59.60 2.370-2.346 2.90 0.114
65 2-1/2' 76.00-75.20 2.992-2.961 3.2 0.126
80 3' 88.70-87.90 3.492-3.461 3.20 0.126
100 4' 113.90=113.00 4.484-4.449 3.60 0.142
British Standards: BS 1387-85 M
DN Designation of Thread Outside Diameter Wall Thickness
(mm) (inch) (mm) (inch)
15 1/2' 21.70-21.10 0.854-0.831 2.6 0.102
20 3/4' 27.20-26.60 1.071-1.047 2.6 0.102
25 1' 34.20-33.40 1.346-1.315 3.2 0.126
32 1-1/4' 42.90-42.10 1.689-1.657 3.2 0.126
40 1-1/2' 48.80-48.00 1.921-1.890 3.2 0.126
50 2' 60.80-59.80 2.394-2.354 3.6 0.142
65 2-1/2' 76.60-75.40 3.016-2.969 3.6 0.142
80 3' 89.50-88.10 3.524-3.469 4 0.157
100 4' 114.90-113.30 4.524-4.461 4.5 0.177
150 6' 166.10-164.10 6.539-6.461 5 0.197
ANSI Standards: ASTM A53 GRADE A SCH40
NPS Outside Diameter Wall Thickness
(mm) (inch) (mm) (inch)
1/2' 21.30 0.840 2.77 0.109
3/4' 26.70 1.050 2.87 0.113
1' 33.40 1.315 3.38 0.133
1-1/4' 42.20 1.660 3.56 0.140
1-1/2' 48.30 1.900 3.68 0.145
2' 60.30 2.375 3.91 0.154
2-1/2' 73.00 2.875 5.16 0.203
3' 88.90 3.500 5.49 0.216
4' 114.30 4.500 6.02 0.237
6' 168.30 6.625 7.11 0.280
8' 219.10 8.625 8.18 0.322
ERW Steel Pipe Production Process
  • Leveling
  • Ends Cutting
  • Slitting
  • Recoiling
  • Coil Ramp
  • Uncoiling
  • Leveling
  • Ends Cutting
  • Trimming & Welding
  • Coil Accumulator
  • Strip Ultrasonic Testing (UT)
  • Forming
  • High Frequency Welding
  • Welding
  • Deburring
  • Seam Annealing
  • Air/Water Cooling
  • Sizing (Round Tube)
  • Online Ultrasonic Testing (U.S. Test)
  • Straightening
  • Flying Cut-off
  • Flattening Test
  • End Finishing
  • Hydrostatic Test
  • Appearance Inspection
  • Offline Ultrasonic Testing (U.S. Test)
  • Marking
  • Oil Coating
  • Packaging & Storage
  • Round Steel Tube
  • Round Steel Tube
  • Round Steel Tube
FAQs
What steels are used for ERW Steel Pipe Production?
We select carbon steel in grades well suited to your specific applications, aiming at providing optimal properties in terms of strength and toughness.
These ERW steel pipes ensure compliance with ASTM, GB/T and BS standards.
The material quality of ERW pipes is guaranteed by these standards, to make sure that the mechanical properties of steel conform to the specified requirements.
Carbon steel is an alloy made primarily of carbon and iron. Based on the carbon content, it can be classified into low carbon steel, medium carbon steel, and high carbon steel. The carbon steel used in our welded pipes primarily includes Q195, Q235, and Q355, and can be selected according to customer requirements.
The carbon steel pipes are extensively used in construction and structural applications for their dependable load-bearing capabilities. They are also applicable to other purposes such as liquid or gas transmission, shipbuilding, cooling systems, etc.
When compared with seamless steel pipes, longitudinally welded pipes are an economical option with accurate wall thickness and diameter. They can be formed into a wide variety of sizes and shapes since there is no limit to the quantities of weld seams.
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As an experienced manufacturer in the steel pipes, our commitment extends beyond merely supplying products.
Steel Tube Manufacturer

Established in 2003, China Steel Pipe Group Corp.,Ltd . is a manufacturer in the steel pipes and PC strand wire industry. Our primary products include ERW pipes, SSAW pipes, LSAW pipes, high-precision welded pipes, prestressed steel wires, and prestressed steel strands. We also offer extensive processing services such as welding, grooving, threading, painting, and coating to meet your specific requirements. Our steel products are widely used in firefighting, cable management, material transportation, steel structures, railings, piling, construction, and machinery manufacturing.

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  • Annual production capacity reaches 500,000 tons.
  • Stainless steel processing experience 21 years
  • Production scale houses more than 20 production lines