openPR Logo
Press release

Performance Comparison of ERW and Spiral Steel Pipe

11-23-2021 11:05 AM CET | Industry, Real Estate & Construction

Press release from: Permanent Steel Manufacturing Co.,Ltd

erw pipe vs spiral steel pipe

erw pipe vs spiral steel pipe

Performance comparison of carbon ERW steel pipe and spiral steel pipe:

1. Overview

The welding of ERW steel pipe is the skin effect and proximity effect of high-frequency current. The process of using high-frequency current and induced high-frequency current (rising at the end of the 20th century) resistance to heat and melt the edge of the tube blank, and apply squeezing force to weld together process.
The welding of SSAW steel pipe is a process in which the weldment, welding wire and flux are melted by the arc under the flux layer, and the molten flux forms a slag to isolate the air and the molten pool from contact, thereby forming a welding joint.

There are two main differences:
A) SSAW has metal fillers such as wire flux, but ERW does not.
B) SSAW forms a weld pool, ERW does not form a weld pool, only a molten state is formed at the edge of the billet.

2. Advantages of ERW steel pipe

A) Short weld length, HAZ is smaller than SSAW;
B)High geometric accuracy;
C) If the burr removal device is used, the weld reinforcement is lower than SSAW, and the conveying resistance is small;
D) The production efficiency is high, and the welding speed is 15-20m/min, which is more than 10 times that of SSAW.

3. Advantages of SSAW steel pipe

A) The direction of the weld avoids the direction of the main stress when the pipeline is under pressure;
B) A single defect on the weld is less framing;
C) Steel strips with the same width can be used to produce steel pipes with different outer diameters, or steel strips with different widths can be used to produce steel pipes with the same outer diameter.

4. Welding performance comparison

A) ERW has fast heating speed, highly concentrated heat, and no filler metal. It is not possible to use wire flux to add alloying elements to compensate for the burning of alloy elements in the welding process like SSAW, and it cannot effectively improve the structure and performance of welded joints like SSAW (microalloying is the main way to refine grains. Grain refinement is the only way to increase strength and toughness at the same time).

B) ERW does not form a welding pool, so the welding dross ability is poor. If there is slag inclusion on the edge of the raw material, it can only remain in the weld and become a quality hazard. However, SSAW forms a welding pool, which is beneficial for slag inclusions to float in the slag.

C) There is no slag/gas protection during ERW welding (SSAW has slag protection formed by flux), and the welded joint structure at high temperature is easily oxidized, which makes the welded joint have a tendency to embrittlement.

D) ERW has the characteristics of high local heating temperature and short cooling time. The welding temperature field has a large gradient, which is prone to hardening phase and large welding stress. The plasticity and toughness of the welded joint are not ideal. Therefore, all ERW steel pipes in the country require post-weld heat treatment (Q+T or Q+N), but the domestic post-weld heat treatment process is not yet mature.

E) Compared with SSAW, the ERW welding speed is too fast, the edge quality of the raw material cannot be tested by NDT, and the NDT test of the weld after welding is also difficult to ensure the quality.

F) Since ERW is welded by pressing molten metal, it is difficult to use NDT for effective inspection. Therefore, incomplete fusion and gray spots are the problems of eRw steel pipes, which have been difficult to effectively solve for decades. Groove corrosion in ERW pipeline failure is mainly caused by unfusion.

G) ERW will inevitably form more "D" joints during pipeline construction, while SSAW will not. As we all know, the "D" joint is the most concentrated part of the stress, which reduces the fatigue life of the welded joint.
H) The residual stress of traditional SSAW pipe is relatively large, and the dimensional accuracy is not as high as ERW. (In fact, the residual welding stress of ERW is also relatively large, of course, a part of it can be eliminated if proper heat treatment can be performed). Nowadays, advanced technologies such as low residual stress forming and mechanical expansion of pipe ends are commonly used for the production of SSAW pipes, and the quality is not much different from LSAW.

The spiral submerged arc welded pipe produced by the Permanent Steel Manufacturing Co.,Ltd can control the residual stress below 10% of the yield strength of the raw material, and the elasticity can be controlled below 20mm. The hydraulic test will further reduce the residual stress and make the residual stress tend to be evenly distributed.After the pipe ends are mechanically expanded, the dimensional accuracy can reach the level of LSAW or ERW steel pipes, which greatly reduces the amount of girth weld misalignment in field welding.

I) Since ERW has no filler metal, there is almost no reinforcement, which is conducive to FBE or 3PE anti-corrosion treatment. SSAW steel pipe has high welding seam reinforcement, and anti-corrosion requires high welding seam shape. Pay attention to the sudden transition between the welding seam and the base metal, forming a right angle or an acute angle. SSAW steel pipe factory generally adopts external welding double wire welding, the front wire guarantees the penetration, and the rear wire mainly guarantees the shape of the weld to achieve a smooth transition. Judging from the steel pipes produced by our factory, there is almost no right angle or acute angle.

Permanent Steel Manufacturing Co.,Ltd: or
Address: #668,Lugu Avenue,Hi-Tech Industrial Development Zone,Changsha,China
LSAW steel pipe:
ERW steel pipe:
ASTM A53 ERW pipe:
Seamless steel pipe:

Permanent Steel Manufacturing Co.,Ltd have years of experience in manufacturing of carbon steel pipe, stainless steel tube, hollow section, pipe fittings.(Fluid Pipe/Boiler Tube/Fire Pipe/Line Pipe/Structure Tube)

As a factory,which specializing in the production, processing and sales of various steel pipes and pipe fittings size enterprises, headquartered in Hunan, the production base is located in Shandong and Tianjin. So far, the facility occupies more than 228,000 square feet under roof and includes two working mills and quality assurance chemical- and strength-testing laboratories on site and located on a 2,000-acre site with more than 60 acres under roof, is home to one of the world’s largest cupolas; and the Contiarc, the first-of-its-kind continuous arc furnace.

This release was published on openPR.

Permanent link to this press release:

Please set a link in the press area of your homepage to this press release on openPR. openPR disclaims liability for any content contained in this release.

You can edit or delete your press release Performance Comparison of ERW and Spiral Steel Pipe here

News-ID: 2470826 • Views: 551

More Releases from Permanent Steel Manufacturing Co.,Ltd

Quality Defects and Prevention of Oil Well Pipe
The quality defects of oil well pipes mainly come from three aspects: The first is the quality defect of the oil well pipe body itself, such as the mechanical properties of the pipe body, the inner connection, the weighing, etc., which do not meet the requirements; The second is the quality defect produced during the processing of the oil well pipe, such as the thread parameters (taper, thread pitch, tooth
Analysis and Comparison of Eddy Current Testing and Magnetic Flux Leakage Testin …
Analysis and comparison of eddy current testing (ET) and magnetic flux leakage testing (MFL) of seamless tube(SMLS): With the development of the national economy, all kinds of seamless tubes are widely used in petrochemical and boiler manufacturing industries, especially in harsh working conditions such as high temperature and high pressure, which have higher requirements for the quality of seamless steel tubes. Seamless steel tubes are generally made through the processes of
Submerged Arc Welding - the Most Practical Steel Pipe Welding Technology
Submerged arc welding (SAW) is one of the most efficient mechanized welding methods today. Its full name is automatic submerged arc welding, also known as automatic arc welding under the flux layer. Submerged arc welding technology is ideal for important applications such as pipelines, pressure vessels and storage tanks, rail manufacturing and large-scale construction. Available in the simplest form of single wire, double wire construction , series double-filament structure, multi-filament structure. Submerged
Innovation of Cold Drawing Process of Seamless Steel Pipe and its Existing Probl …
Speeding up and strengthening the drawing process of seamless steel pipes, improving the quality of pipe making, and improving the intermediate process are the keys to simplifying the cold drawing process of seamless steel pipes and winning "high yield, high quality, multiple varieties, and low consumption". The following seamless steel pipe manufacturers will introduce to you the main experience and exploration work in this regard. 1. Hammer Technique Change to hot rolling

All 5 Releases

More Releases for ERW

Seamless casing pipe vs ERW casing pipe
Seamless steel casing pipes-casing made of seamless steel pipe as raw material Seamless pipe refers to a steel pipe manufactured by four methods: hot rolling, cold rolling, hot drawing, and cold drawing. There is no weld seam on the pipe body itself. ERW casing pipe-casing made of electric welded pipe as raw material ERW pipe refers to a straight seam welded pipe manufactured through a high-frequency resistance welding process. The raw material steel
Non-destructive Testing of A53 ERW Welded Pipe
In order to protect the quality of the ERW welded pipe we produce, we will conduct quality inspection on each welded pipe produced. So what are the inspection methods for welded pipe? Today we will follow the editor of the Permanent Steel Manufacturing Co., Ltd welded pipe manufacturer to understand a bit. At present, the most common detection method we use is to use magnetic powder to detect the quality of
ERW Steel Pipes And Tubes Market Research Technology Outlook 2019-2024
The ERW Steel Pipes And Tubes Market recently launched by Market Insights Reports for its clients. This report offers to clients with factual data validated by industry experts and business heads. The report highly involves chapter wise explanation for every aspect of the market wherein the drivers, trends, opportunities, leading and trending segments are discussed in detail with specific examples. Profiles of leading players are also discussed along with their
ERW Steel Pipes and Tubes Market
According to a research report published by Azoth Analytics in June 2019, the Global Electric Resistance Welded (ERW) Steel Pipes and Tubes Market was valued at USD 86.6 billion in the year 2018. Global ERW Steel pipes and tubes market is expected to grow mainly due to rapid urbanization in emerging economies, development of larger projects in construction, water and waste water sector along with robust industrialisation growth in automotive,
Global ERW Steel Pipes and Tubes Market Growth 2019-2024
Market Research Report Store offers a latest published report on ERW Steel Pipes and Tubes Market Analysis and Forecast 2019-2025 delivering key insights and providing a competitive advantage to clients through a detailed report. This report focuses on the key global ERW Steel Pipes and Tubes players, to define, describe and analyze the value, market share, market competition landscape, SWOT analysis and development plans in next few years.To analyze the
ERW Steel Pipes and Tubes Market Size, Share, Development by 2024
Global Info Research offers a latest published report on ERW Steel Pipes and Tubes Market Analysis and Forecast 2019-2025 delivering key insights and providing a competitive advantage to clients through a detailed report. This report focuses on the key global ERW Steel Pipes and Tubes players, to define, describe and analyze the value, market share, market competition landscape, SWOT analysis and development plans in next few years. To analyze the ERW