Astm a53 6" Welded ERW Steel Pipe Electric Power Industry

4" 6" High Frequency Welded For Electric Power Industry ERW Steel Pipe

ERW steel tube.Due to the continuous improvement and perfection of the structure of the burr removal system and the cutting tool, the burr removal of large and medium caliber steel tubes has been better handled.

ERW steel pipe is straight seam Resistance Welding pipe, English Electric Resistance Welding, abbreviated as ERW, used for transporting oil, natural gas and other vapor liquid objects, can meet the high and low pressure requirements, currently in the world's transportation pipe field occupies a pivotal position.The biggest difference between ERW steel pipe and seamless steel pipe is that ERW has a weld, which is also the key to the quality of ERW steel pipe.Modern ERW steel tube production process and equipment, because of the international, especially the United States and other years of unremitting efforts, so that the seamless ERW steel tube has been a relatively satisfactory solution.

It is necessary to take measures to make it uniform and consistent.The high frequency welding thermal process of ERW steel tube results in the gradient of temperature distribution near the edge of the tube blank, and forms the characteristic areas such as melting zone, semi-melting zone, superheated structure, normalizing zone, incomplete normalizing zone and refiring zone.Among them, the austenite grains in the overheated area grow rapidly due to the welding temperature above 1000℃, and the hard and brittle coarse grain phase will be formed under the cooling condition.