H-beam is a kind of Economic section steel, which  sectional area distribution is more optimized, the  ratio of  strength to weight is more reasonable, Mechanical properties of section is more better.It is developed from the I-section steel optimization of a better section mechanical properties of the economic section steel, because its section is same as  the English letter "H" ,so be named as H-Beam. Because the various  part of H-beam is arranged at right angles, H-beam has the advantages of strong bending resistance, simple construction, cost saving and light structural weight in all directions, so it has been widely used.

Size:Ф20～350 Round steel belongs to carbon structural steel for construction and machinery, while square steel belongs to carbon structural steel for machinery. Both of them are simple section steel, and their section shapes are respectively round and square. Low carbon is mainly used for drawing wire, forging rivets, bolts, nuts and other metal products of raw materials. Medium carbon round steel and square steel are generally used to make mechanical structural parts.

1. Power industry -- fan blades, burner pipelines, feeder and hopper lining, crusher parts, coal grinder parts, ash pipes, air handling systems and conveyors; 2. Have spentIron and steel industry - hopper lining, grille, feeder and base, dump truck, hopper, pipe, pump shell, crusher parts, slag trough, various chassis, vibrating screen;

This specification covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. The pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. All seamless and welded pipes shall be treated to control their micro-structure. Tensile tests, impact tests, hydro-static tests, and nondestructive electric tests shall be made in accordance to specified requirements.