The application of erw steel pipe in oil and chemical industry

The oil and chemical industry needs thousands of tons steel pipe every year. Among them, the welded tubes occupies asuitable portion. The seamless pipe can be successfully instead by welded tubes because of technique progress insteel making, rolling, welding? Owning to the cost superiority, the erw steel pipe will be used more and more inreengineering of oil and chemistry industry.

In recent years, there has been a trend in the world to replace high-cost seamless steel pipes with high-quality welded pipes. This is mainly due to the continuous breakthrough in the production technology of welded pipes, which is reflected in the following aspects:
(1) Advances in desulfurization technology have reduced the sulfur content of steel and improved the welding quality of steel pipes.
(2) The application of vacuum degassing technology improves the purity of the tube blank strip, reduces inclusions, and improves the quality of the weld.
(3) Due to the addition of special elements such as V, Ti, and Nb, the carbon equivalent is lowered, and the toughness and strength of the steel pipe are improved.
(4) The development of hot rolling technology has improved the dimensional accuracy of the strip and thus reduced the dimensional deviation of the welded pipe.

(5) Improvement of quality inspection methods, such as ultrasonic non-destructive testing, hydraulic testing machines and other equipment, to ensure the quality of the final product.

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