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Grain-oriented silicon steel (Fe-Si steel; transformer steel; electrical steel) is a soft magnetic polycrystalline metallic alloy that is used as core material in electrical transformer cores and electrical motors.

Grain-oriented silicon steel (Fe-Si steel; transformer steel; electrical steel) is a soft magnetic polycrystalline metallic alloy that is used as core material in electrical transformer cores and electrical motors.

ERW steel pipe is a straight seam electric resistance welded pipe, abbreviated as ERW pipe, which is a round pipe welded by steel plates. It is used to transport vapor and liquid objects such as oil and n atural gas, and can meet various requirements of high and low pressure.

Round steel belongs to carbon structural steel for construction and machinery, while square steel belongs to carbon structural steel for machinery. Both of them are simple section steel, and their section shapes are respectively round and square. Low carbon is mainly used for drawing wire, forging rivets, bolts, nuts and other metal products of raw materials. Medium carbon round steel and square steel are generally used to make mechanical structural parts.

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