High-frequency straight seam electric-resistance welded steel pipe(erw steel pipe) is hot-rolled coil after forming machine, the use of high-frequency current skin effect and proximity effects, the tube edge heating and melting, squeeze roller under pressure welding to achieve production.

High-frequency resistance welding steel pipe, welding pipe and ordinary welding process is not the same, the weld is made of the base metal melt from the body, the mechanical strength is better than the general pipe. Smooth appearance, high precision, low cost weld high and small, favorable 3PE anti-corrosion coating. There are significant differences in the welding methods between high frequency welded pipe and submerged arc welded pipe. As the welding is done instantly at high speed, the difficulty of ensuring the quality of welding is much higher than that of submerged arc welding.

ASTM A513 ERW pipe advantages

ERW (Electric Resistance Welding) steel pipe is referred to as ERW pipe or HF welded pipe, it has many advantages as following:

1) high production efficiency, low cost, its price is about the the UOE straight seam submerged arc welded steel, 85%;

2) high dimensional accuracy, its roundness (Roundness) is superior to spiral welded pipe, the counterpart can save a lot of hours in the field;

3) smooth surface, beautiful appearance, which is conductive to inner and outer coating . In the past, poor reliability of ERW pipe welds, pipe there have been a large number of accidents, thus limiting the use of ERW pipe. Recently,,through the joint efforts of researchers and pipe manufacturers, this situation has been changed.Substantially of ERW steel pipe weld quality can be as well as that of LSAW.

ASTM A513 ERW pipe manufacturing process

ERW pipe process mainly depends on a variety of products from raw materials to finished products, which need to go through a series of processes, completion of these processes requires a variety of machinery and equipment and welding, electrical controls, detection devices, these devices and devices according to different. The process requires a variety of reasonable arrangements, the typical flow of high frequency welded pipe: Roll uncoiling – strip leveler – head and tail cut – strip butt – looper accumulator – molding – welding – clear the glitch – sizing – flaw -fly cut – Initial verification – tube Straightening – pipe processing – hydrostatic testing – flaw detection – Printing and coating – finished.

ASTM A513 ERW pipe Inspection

Hydrostatic testing, ultrasonic testing, eddy current testing, magnetic particle testing, impact testing,and hardness testing, etc.

ASTM A513 ERW pipe package and storage

Safe and Seaworthy packing suitable for export; As per customer’s requirement.

ASTM A513 ERW pipe quality inspection

1. Our factory has its own "experimental testing center".CNAS Laboratory Accreditation Certificate

2. Quality is controlled strictly.The first inspection is the quality inspection on the production line,The second inspection is full inspection of the production quality .

3.We have got internationally recognized certificates, ISO, CE, LR,Philippine certificate,also support third-party testing,as SGS, BV etc.

ERW steel pipes means Electric Resistance Welded Pipes.

ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.

ERW steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes.

All of the products we are supplying can reach the international standard like: ASTM, JIS, DIN, EN, API, BS.

Our company's production is carried out in accordance with TS EN ISO 9001:2000, API5 L, ISO 14001:2004 and ISO9001,SGS Integrated Management(quality) Systems.

Production in our facilities is also realized in accordance with the international standards such as TS, DIN, AWWA, ASTM, BS, UNI, JIS, GOST, ANSI, ISO.

Our product finds its usage for Agricultural purposes, Drinking Water for housings, in collieries for extraction of Water,

Thermal Powers, Transports- for all kind of pipeline usage.

Hand pumps for deep boring wells, as a strong protection for cables by Telecom Department, Structural Purposes etc.