Current label: Rectangular tube manufacturer direct sales
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Introduction to rectangular tubes: 1. Consumption and manufacturing methods: ① The operating temperature of ordinary boiler tubes is below 450 ℃, and domestic tubes are mainly made of 10 # and 20 # carbon bonded steel hot-rolled tubes or cold drawn tubes. ② High pressure boiler tubes are often in high temperature and high pressure conditions when they are used. Under the action of high-temperature flue gas and water vapor, the tubes will be oxidized and corroded. The steel pipe is required to have high durability
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Identification method of rectangular tube: 1. Fake and inferior rectangular tubes are easy to fold. Folding is a variety of broken lines formed by the appearance of rectangular tubes, and this defect often runs through the longitudinal direction of the whole product. The reason for folding is that the fake and inferior manufacturers pursue efficiency, and the reduction is too large to produce ears. The folding will occur during the next rolling. The folded products will crack after bending, and the strength of steel will drop greatly. 2. Pseudo