... , which is one kind of sectional steel .the specifications is subjected to the waist high (h) * le 1)summary: ... girlder , which is one kind of sectional steel .the specifications is subjected to the waist high (h) * leg width (b) ... *357*19*19mm 2)usage:It is used for the struction of building, bridge,cars ,machinary and so ... thick, a ,b,c is added befor the type .for example32a#, 32b#, 32c#.. H beam