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Shandong Tianxinda Special Steel Co., Ltd. provides you with q345h steel Leshan manufacturer. Leshan q345h steel manufacturer
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The international standards of h-beam products are divided into two categories: the imperial system and the metric system. The British system is adopted in the United States, Britain and other countries, while the metric system is adopted in China, Japan, Germany and Russia. Although the British system and the metric system use different measurement units, the specifications of h-shaped steel are mostly expressed in four dimensions, namely, web height h, flange width b, web thickness d and flange thickness t. Although the expression method for the size of h-shaped steel is different in different countries. However, there is little difference in the size range and tolerance of the products produced.
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Production method: h-shaped steel can be produced by welding or rolling. The welding of h-shaped steel is to cut the strip steel with proper thickness into proper width, and weld the flange and web together in the continuous welding unit. The welding of h-shaped steel has many disadvantages, such as high metal consumption, difficulty in uniform product performance, size and specification, etc. Therefore, h-beam is mainly produced by rolling method. In modern rolling production, h-beam is rolled by rolling mill. The web of the h-beam is rolled between the upper and lower horizontal rolls, and the flange is rolled between the side of the horizontal roll and the vertical roll at the same time. Since the edge of the flange cannot be pressed down by the rolling mill alone, it is necessary to set the edge rolling machine behind the stand, commonly known as the edge rolling machine, so as to press down the edge of the flange and control the flange width. In the actual rolling operation, these two stands are taken as a group to make the rolled piece pass through several times (Fig. 2a), or make the rolled piece pass through the continuous rolling mill consisting of several stands and one or two edge rolling end stands, and each pass applies --- reduction to roll the billet into products of the required specifications, shapes and sizes. At the flange of the rolled piece, due to the sliding between the side of the horizontal roll and the rolled piece, the wear of the roll is relatively large. In order to restore the original shape of the loaded roll, the side of the upper and lower horizontal rolls of the roughing mill and the corresponding vertical roll surface should be inclined at an angle of 3 °~8 °. In order to correct the inclination of the flange of the finished product, the finished product mill, also called finishing mill, is set. The side of the horizontal roll is perpendicular to the axis of the horizontal roll or has a small inclination angle, generally no more than 20 '. The vertical roll is cylindrical.
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When h-beam is rolled by rolling mill, the section of rolled piece can be extended evenly, and the speed difference between the inner and outer roll surfaces of flange is small, which can reduce the internal stress of products and the defects on the shape. H-beam of different specifications can be obtained by properly changing the reduction of horizontal and vertical rolls of the mill. The roll shape of the rolling mill is simple, ---, and the consumption of roll can be greatly reduced. The advantage of rolling h-beam by rolling mill is that only the thickness of web and flange is changed in the same size series, and the size of other parts is fixed. Therefore, the same series of h-shaped steel rolled by the same pass has a variety of web and flange thickness specifications, which greatly increases the number of h-shaped steel specifications and brings convenience for users to select appropriate sizes.
In case of no rolling mill, sometimes in order to meet the urgent need of production and construction, the ordinary two high rolling mill can also be equipped with a vertical roll frame to form a pass to roll h-beam. In this way of rolling h-shaped steel, the product size accuracy is low, it is difficult to form a right angle between the flange and the web, the cost is high, and the specifications are few. It is difficult to roll h-shaped steel for columns, so there are few users.
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