SERVICES

serve end customers, subsidiaries, and professional companies to ensure customer satisfaction and exceed customer expectations.

Don't stick to stereotypes, dare to innovate marketing systems and mechanisms.

Improve the communication efficiency between the group and its subsidiaries, between subsidiaries and subsidiaries, between subsidiaries and major customers, and between the group and major customers, so that the support team can respond quickly and operate efficiently.

not conservative, face the market, all subsidiaries, and all major customers with an open mind and approach.

breaking the shackles of regions and rules, all resources are shared in the whole group to maximize the benefits of the group.

(1) Higher strength (tensile strength fu and yield point fy);
(2) Sufficient deformation capacity (plasticity and toughness);
(3) Good process performance (cold working, hot working and weldability);
(4) According to the specific working conditions of the structure, steel is sometimes required to have the ability to adapt to low temperature, high temperature and corrosive environment).

The actual steel structure members sometimes have holes, notches, concave corners, sudden changes in section and internal defects of steel. At this time, the stress distribution in the component will no longer be uniform, but will produce local peak stress in some areas, and reduce the stress in other areas, that is, produce a stress concentration image. Under the action of negative temperature or dynamic load, the adverse effect of stress concentration will be very prominent, which is often the source of brittle failure.

The fatigue fracture of steel is a brittle failure in which the micro cracks continue to expand until fracture under continuous repeated load.

Importance of structure or component; Load nature; Connection method; Working conditions of the structure; Thickness of steel

The connection methods of steel structure can be divided into welding connection, bolt connection and rivet connection.

The connection methods of steel structure can be divided into welding connection, bolt connection and rivet connection.

The main difference between high-strength bolted connection and ordinary bolted connection is that ordinary bolted connection relies on the bolt shank to bear pressure and transmit shear force during shearing. The pretension generated by the bolt when tightening the nut is very small, and its impact can be ignored. In addition to the high material strength of high-strength bolts, tightening the bolts also exerts a great pre tension, which generates a compression force between the contact surfaces of the connected plates, so there is a great friction between the plates.

With the increase of carbon content, the strength increases, the plasticity, toughness and fatigue strength decrease, and the weldability and corrosion resistance deteriorate at the same time. Sulfur makes steel hot and phosphorus cold. But phosphorus can also improve the strength and rust resistance of steel.

Plastic failure is caused by excessive deformation, which exceeds the possible strain capacity of the material or component. It only occurs when the stress of the component reaches the tensile strength fu of the steel. Before failure, the component produces large plastic deformation; Brittle failure refers to the failure form in which the plastic deformation is very small, or even no plastic deformation, the calculated stress may be less than the yield point fy of steel, and the fracture starts from the stress concentration.

(1) It shall be able to withstand various situations that may occur during normal construction and normal use, including load and temperature changes, uneven settlement of the foundation, earthquake action, etc;

(2) The structure has good working performance under normal use;

(3) The structure has sufficient durability under normal maintenance;

(4) The necessary overall stability can still be maintained in the event of and after the occurrence of accidental events.