ERW(Electric Resistance Welding)
ERW welded pipes are divided into ordinary welded steel pipes and low pressure flow welded steel pipes. The latter has an additional hydraulic test, and the price is also about 80 per ton higher than that of ordinary welded pipes. Mainly used for low-pressure fluid transmission pipelines such as steel structure engineering, machinery manufacturing, construction water and oil pipelines
Spiral welded pipe
Spiral welded pipe is made by rolling low-carbon carbon structural steel or low alloy structural steel strip into pipe blank according to a certain helix angle (called forming angle), and then welding the pipe seam. It can produce large-diameter steel pipe with narrow strip steel.
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Standard
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API5L, ASTM A106 Gr.B, ASTM A53 Gr.B, ASTM A270, ASTM A249, ASTM A511,ASTM A778 ,ASTM A312,ASTM A358,ASTM A409,ASTM A213,ASTM
A790,ASTM A268,ASTM A269,ASTM A554,ASTM B338,ASTM B673,ASTM B674,ASTM B677,ASTM B675, ASTM B676, ASTM B690,ASTM A928,ASME B36.19,ASMEB36.10,ASTMA179/A192/A213/A210/370WP91,WP11,WP2 |
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GB5310-2009,GB3087-2008,GB6479-2013,GB9948-2013,GB/T8163-2008, GB8162-2008,GB/T17396-2009
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EN10216-5,EN10217-7,DIN 17456,DIN 17458
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JIS G3463,JIS G3119,JIS G3446,JIS G3218,JIS G3258,JIS G3448,JIS H4631
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DEP 31,DEP 40,DEP 20,DEP 32,DNV-OS-F101
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Grade
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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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Q345 = S355JR / A500 Grade B Grade C
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Outer Diameter
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ERW / HFW
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LSAW / DSAW
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SSAW / HSAW
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RHS
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SHS
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1/8 - 20 inch
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12 - 56 inch
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8 - 126 inch
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40 x 20 mm
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15 x 15 mm
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(10.3-508 mm)
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(323.8-1,420 mm)
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(219.1-3,200 mm)
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-1,000 x 800 mm
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-1,000× 1,000 mm
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Wall Thickness
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0.4 - 16 mm
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6.0 - 40 mm
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6.0 - 26 mm
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1.0 - 30 mm
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0.6 - 30 mm
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Length
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5.8~12.0 m or as customized
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Surface Treatment
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Prime quality (bared, oiled, color paint, 3LPE, or other anti-corrosive treatment)
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Seamless pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow - liquids and gases (fluids), slurries, powders and masses of small solids.
1. Steel tubing is a hollow steel shape intended for structural purposes and made from carbon, stainless, or galvanized steel further divided as:
· Mechanical Tubing is used in low stress applications such as fences, kitchens, restaurants, hospitals, solar panels and made with wall thicknesses up to 10 gauge.
· Structural Tubing is for high stress structural application like bridges, buildings, roll cages, and underwater platforms with wall thickness from 3/16" and up. It is often referred to as Hollow Structural Sections or just the acronym HSS.
2. Pipe is a hollow structure that is intended to carry material such as liquids, gasses, or even solids. Its wall thickness is described by its Schedule and it is often broken down by type using the method of manufacturing it, either ERW or Seamless.
Seamless pipe (and tubing) is made by extruding a steel block or by drilling a solid steel bar. Next, the extrusion or the drilled steel bar is cold drawn through a dye to achieve the diameter and thickness needed. Because this process can cause mechanical hardening, sometimes the material is annealed and straightened as a final process. Seamless Pipe & Tubing is subdivided as:
Cold Drawn Seamless, or CDS, exhibits precise tolerances and a good surface finish.
| Grade | Chemical Compositions | |||||||||
| C | Mn | P | S | Si | Cr | Cu | Mo | Ni | V | |
| A106-A | ≤0.25 | 0.27-0.93 | ≤0.035 | ≤0.035 | ≥0.10 | ≤0.40 | ≤0.40 | ≤0.15 | ≤0.40 | ≤0.08 |
| A106-B | ≤0.30 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≥0.10 | ≤0.40 | ≤0.40 | ≤0.15 | ≤0.40 | ≤0.08 |
| A106-C | ≤0.35 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≥0.10 | ≤0.40 | ≤0.40 | ≤0.15 | ≤0.40 | ≤0.08 |
| Grade | Mechanical Properties | |||||||||
| Tensile Strength(Mpa) | Yield Strength(Mpa) | Elongation(%) | ||||||||
| A106-A | ≥330 | ≥205 | 30 | |||||||
| A106-B | ≥415 | ≥240 | 30 | |||||||
| A106-C | ≥485 | ≥275 | 30 | |||||||
Application
Carbon steel pipe and tube are used in high-pressure conditions. They are highly resistant to shock and vibration, making it ideal to transport fluids. Carbon steel pipes are widely used in a number of industries, such as construction material, buidlings, bridges, transporting water and sewage, oil and gas industries, boiler and condenser tubes, high-pressure applications, and chemical processing.
- Construction material / bridges
- Transporting water and sewage
- Oil and gas industries
- Boiler and condenser tubes
- High-pressure applications
- Chemical processing
Hot Finished Seamless, or HFS, has less critical tolerances and somewhat scaly finish and is not as strong as CDS.
