HSTECH is specializing in supply ERW (Electrical Resistance Welding) pipes produced by HUSTEEL, which are manufactured by cold forming of steel coil into a round cylindrical shape are used in various engineering purposes.
Manufacturing process
ERW steel pipe is formed by rolling plate and welding the seam.
Tolerance of outside diameter
| Out Diameter | Tolerance of Pipe End | Tolerance of Pipe Body |
| 219.1-273.1 | +1.6mm, -0.4mm | ±0.75% |
| 274.0-320 | +2.4mm, -0.8mm | ±0.75% |
| 323.9-457 | +2.4mm, -0.8mm | ±0.75% |
| 508 | +2.4mm, -0.8mm | ±0.75% |
| 559-610 | +2.4mm, -0.8mm | ±0.75% |
Tolerance of wall thickness
| Grade | Out Diameter | Wall Thickness |
| / | 219.1-457 | +15%, -12.5% |
| B | 508-610 | +17.5%, -12.5% |
| X42-X80 | 508-610 | +19.5%, -8% |
ERW pipe FAQs
ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.
| ERW Pipe coating | The surface condition of steel pipe is known as the environment that this is through the steel pipe coating with the surrounding soil insulation, pipe surface condition is different from the four weeks the soil. |
| Advantage of ERW pipe | The alloy content of the coil is often lower than similar grades of steel plate, improving the weldability of the spiral welded pipe. Due to the rolling direction of spiral welded pipe coil is not perpendicular to the pipe axis direction, the crack resistance of the spiral welded pipe materials. |
| Electric resistance welded | Current is then passed between the two edges of the steel to heat the steel to a point at which the edges are forced together to form a bond without the use of welding filler material. Initially this manufacturing process used low frequency A.C. current to heat the edges. This low frequency process was used from the 1920’s until 1970. In 1970, the low frequency process was superseded by a high frequency ERW process which produced a higher quality weld. |
| Difference between ERW, SSAW, LSAW | Steel pipe for pipe technology, can be divided into (SML), mainly as the Oilfield internal transportation pipeline and small-diameter high-pressure natural gas pipeline, used for a small number of long-distance gas pipeline, the vast majority of long-distance pipeline with Direct seam high frequency (ERW), spiral submerged arc (SSAW), LSAW three (LSAW). |
| High Frequency Resistance Welding | A continuous helical fin is attached to the base tube by high frequency electric resistance welding in order to give an efficient and thermally reliable bond. Fins can be either solid or serrated (segmented). The weld produced in this process is a true forge, blacksmith weld. This type of weld is comprised of a fusion between two portions of parent metal without the introduction of a filler material. The weld is simply produced by heating the interfaces to be joined to a plastic state and applying pressure. Used in boilers, furnaces and fired heaters for efficient heat recovery. |
| ERW pipe technical requirements | ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc. |
| Manual ultrasonic testing of ERW steel pipe welding joint | The residual defects in erw steel pipe ultrasonic testing is an important reason for failure of the weld, causing defects missed is inappropriate due to a probe parameter selection, disturbing wave effects and burr flaw echo echo does not distinguish between such a variety of factors. |
| Manual ultrasonic testing of ERW steel pipe welding joint | The residual defects in erw steel pipe ultrasonic testing is an important reason for failure of the weld, causing defects missed is inappropriate due to a probe parameter selection, disturbing wave effects and burr flaw echo echo does not distinguish between such a variety of factors. |
| ERW pipe weld contour shape |
Scrape the inside welds very smooth burr, weld and base metal transition very smooth. Usually a steel pipe wall thickness is 11.9mm, a thickness range of extrusion welds typically range from about 25mm to either side of each weld, the weld portion after the removal of burr than other parts of the base material thickness of about 10%. |
| ERW steel pipe products range | ERW steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes. |
| The welding pressure of erw pipe | Straight seam welded steel pipe, according to welding process can be divided into high frequency resistance welding and submerged arc welding, longitudinal submerged arc welded is short for SAWL, high-frequency straight seam resistance welding is short for ERW. |
| ERW pipe issues and defects | ERW pipe issues and defects is related to raw materials, production methods, process conditions, equipment status and personnel. Product defects that appear in the production process by the above factors and constraints. |
| ERW pipe weld surface | High-frequency electric resistance welding (ERW) steel pipe production, internal weld surface treatments are generally incomplete curettage (left weld reinforcement) and complete curettage (scraping will form the inner surface of the groove) in two ways, and the results were not ideal, will affect the overall performance of the steel pipe. Taking into account the thickness of ERW pipe welds, strength and reliability of ultrasonic testing, squeeze through thick welds – calibrating processing, optimized contour shape welds to improve the overall performance of ERW pipe. |