Comparison of Performance and Technical Indicators of ERW and SML

1. Tube blank quality
ERW steel pipe special steel has high purity. Through de-S, de-P, de-aeration, Ca treatment and other methods, the S and P content can be controlled below 0.005%, the N content can be controlled below 0.008%, the shape of the inclusions can be controlled to be spherical and the number can be greatly reduced. The C content is controlled below 0.1%, which has good welding performance, and the increase in strength is to prevent the growth of austenite grains by adding trace alloy elements such as Nb, V, Ti, etc., while increasing the gap strengthening to improve the steel Toughness and strength. The billet of SML steel pipe is generally made of A3, 20 steel, 16Mh and other materials. The purity of the material is poor, and the C content is high, generally about 0.2%, which is not conducive to girth welding during construction, and the strength is acceptable. But toughness is poor.

ERW steel tube blanks are manufactured by cold-rolling hot-rolled steel strips, while SML steel tube blanks are perforated in round steel in the hot-rolled state. The grain size and microstructure density of SML tube blanks formed by hot rolling are far from those of ERW tube blanks.

2. Geometry
The SML steel pipe is continuously perforated in a hot rolling mill, while the ERW steel pipe is formed by cold-rolling a steel strip. ERW is easier to control in terms of appearance and size. Therefore, the appearance quality defects of ERW steel pipes are fewer and better than SML steel pipes.

Due to the use of computer flying saws, the precision of the high-frequency welded pipe and the fixed-length length are high.

Because the high-frequency welded pipe is made of hot-rolled steel strip with high rolling accuracy, its thickness is easy to control, and it can be produced according to design requirements with thinner wall thickness and higher steel grade. The wall thickness of seamless steel tubes is often limited by perforation technology and production costs, and thin-walled steel pipes are very difficult.

New service from OilVoice
Trip Shepherd is for companies who need to track their staff in areas of risk.
It's free to use, so we invite you to try it.

Visit source site

ERWSMLSTechnical Indicatorsperformance

More items from lvy

The Technological Development Process of ERW Steel Pipe

High frequency straight seam welded pipe (ERW) is the hot rolled coil plate formed by the forming machine, using the skin effect and proximity effect of high frequency current to heat and melt the edge of the tube blank, and pressure welding under the action of the squeeze roller To achieve product ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd

Posted 3 days agoPress > erw steel pipeTechnological Developmentwelded pipe +1

Analysis of Main Causes of Gas Pipeline Leakage

There are many causes of gas pipeline leakage accidents. In an industrial system dominated by diversified mechanisms, management and maintenance and construction quality are the main causes of gas pipeline leakage. Find out the basic causes of the accident and take timely preventive work. It is an ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd

Posted 13 days agoPress > Gas Pipeline LeakageChina Pipe manufacturerOil and Gas

How to Get Out of Trouble for Seamless Steel Pipe Manufacturers

The seamless steel pipe industry has been in a downturn for nearly a year. Faced with this phenomenon, many seamless steel companies are demanding a new way out. So, in the face of this phenomenon, what exactly do companies need to survive in such a market environment and even make a profit? Seam ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd

Posted 1 month agoPress > seamless steel pipe manufacturerBusiness

Causes of Cracking of ERW Welded Pipes and Countermeasures

Thermal cracking refers to the cracks generated at high temperature, also known as high temperature cracks or crystal cracks, which usually occur inside the weld, and sometimes may also appear in the heat affected zone. The manifestations are: longitudinal cracks, transverse cracks, root cracks, cra ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd

Posted 1 month agoPress > ERW Welded PipeChina Pipe manufacturer

Electric Resistance Welded (ERW) Pipe Manufacturing Process

Electric resistance welding ( ERW Pipe ) is used to transport oil, natural gas and other vapor and liquid objects, which can meet various requirements of high and low pressure, and currently occupies a pivotal position in the field of transportation pipes in the world. The electric resistance weld ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd

Posted 1 month agoPress > electric resistance welded pipeERW pipeManufacturing Process
All posts from lvy