There are many product specifications of H-beam, and there are several classification methods
(1) According to the width of the flange of the product is divided into wide flange, center flange and narrow flange H-beam. Wide and medium flange H-beam flange width B is greater than or equal to the web height H. Narrow flange H-beam flange width B is approximately equal to one-half of the web height H.
(2) According to the use of the product is divided into H-beam, H-beam column, H-beam pile, very thick flange H-beam. Sometimes also parallel leg channel steel and parallel flange d-beam steel is also included in the scope of H-beam. Generally narrow flange H-beam as a beam material, wide flange H-beam as a column material, according to which there are beam H-beam and column H-beam called
(3) according to the production method is divided into welded H-beam and rolled H-beam.
(4) According to the size specification size is divided into large, medium and small H-beam. Usually the web height H in 700mm above the product is called large, 300 ~ 700mm is called medium, less than 300mm is called small. By the end of 1990, the world's largest H-beam web height of 1200mm, flange width of 530mm.
Internationally, the product standard of H-beam is divided into two categories: the imperial system and the metric system. The United States, Britain and other countries using the British system, China, Japan, Germany and Russia and other countries using the metric system, although the British system and the metric system using different units of measurement, but the H-beam steel is mostly used in four sizes to indicate their specifications, that is: the web height h, the flange width b, the web thickness d and the flange thickness t. Despite the world's different countries of the size of the size of H-beam size of the method of expression. But the range of size specifications and size tolerances of the products produced do not differ much.
