Just choose the steel we need to pay attention to some problems.

    In general, the direct receiving member and the structural dynamic loads (such as crane beams, a working platform beams or directly bear the load of the vehicle trestle member, etc.), an important component or structure (such as trusses, floor roof girders, beams and other frameworks subject to greater tension and other similar structures and components), the use of structural welded connections, as well as the structure of the work is at a low temperature, it should be a higher quality of steel. To withstand static load of tension and welded components and structures important in bending, and should use a thin steel and plate material; elected with large thickness profiles or sheet, it should adopt higher quality steel, to prevent Steel larger residual stress and defects and External Force formed a three-way tensile stress field, causing brittle failure.

    Load-bearing structure of steel should have a tensile strength, elongation, yield strength, and sulfur, and phosphorus content of qualified assurance of welded structures still should have a carbon content of assurance of conformity. Welding load-bearing structure and the important non-load-bearing structure of welded steel, cold-formed should have qualified assurance tests.

    The selection also must go through a number of related quality assurance in order to ensure the reliability of the strength of steel carrying capacity to ensure the safety of steel used in construction and engineering. To avoid some of the accidents. Steel works in the choice of building materials must be used in accordance with the relevant regulations. Strict norms to purchase reliable products, is responsible for the successful completion of the steel structure engineering and use.