There are many product specifications of H-beam, and the classification methods are as follows.
(1) According to the flange width of the product, it is divided into wide flange, middle flange and narrow flange H-section steel. The flange width b of wide flange and middle flange H-shaped steel is greater than or equal to the web height H. The flange width b of narrow flange H-shaped steel is about half of the web height H.
(2) According to the purpose of the product, it is divided into H-shaped steel beam, H-shaped steel column, H-shaped steel pile and H-shaped steel beam with extremely thick flange. Sometimes, parallel leg channel steel and parallel flange T-shaped steel are also included in the scope of H-section steel. Generally, narrow flange H-section steel is used as beam material and wide flange H-section steel is used as column material. Therefore, it is also known as beam H-section steel and column H-section steel.
(3) According to the production mode, it is divided into welded H-section steel and rolled H-section steel.
(4) According to the size, it is divided into large, medium and small H-section steel. Generally, products with a web height h of more than 700mm are called large, those with a web height of 300 ~ 700mm are called medium, and those with a web height of less than 300mm are called small. By the end of 1990, the web height of H-section steel in the world was 1200mm and the flange width was 530mm.
Internationally, the product standards of H-beam are divided into British system and metric system. The United States, Britain and other countries adopt the British system, while China, Japan, Germany and Russia adopt the metric system. Although the measurement units used in the British system and the metric system are different, most of the H-section steel uses four dimensions to express their specifications, namely: web height h, flange width b, web thickness D and flange thickness t. Although different countries in the world express the size of H-section steel differently. However, the size range and dimensional tolerance of the products produced are not much different.