Measures to adjust the structure of the power grid, adjust the investment ratio of the power grid and the power source, and implement the principle of strengthening the power grid to increase the proportion of power grid investment. In the past two years, the proportion of power grid investment has increased significantly. The investment in power grid construction during the “Tenth Five-Year Plan†period should reach 40% of the total power construction investment. The power grid construction will be gradually delayed behind the power supply construction, and the goal of coordinated development of power grid and power supply will be achieved. . The development of the power grid adheres to the four unification. In accordance with the principle of “national power gridâ€, power grid development should implement unified planning, unified construction, unified management and unified dispatch. Focus on strengthening, transforming and improving the transmission network and the receiving power grid, combining the far and near, optimizing the structure, and gradually achieving coordinated development of hierarchical and zoning. Strengthen the province's 500 (330) kV main grid, the regional backbone grid and the receiver grid, and build a large channel for the west to east to ensure the safe and stable operation of the grid. Accelerate the construction and transformation of urban and rural power grids. The dual task of construction and transformation of distribution network should be implemented under the premise of optimizing the structure of power sales network. According to the construction and transformation planning standards, after several years of efforts, the operation status of the distribution network has been fundamentally improved, and it has become electricity supply. A grid that is economical, flexible, and highly reliable, and fully meets the needs of users. It is necessary to decompose the power grid construction and transformation objectives, strengthen management of specific projects, and control the efficiency of capital investment.
The cold working methods of steel pipes mainly include cold drawing and cold rolling. The raw materials of cold-rolled steel pipes can be hot-rolled seamless steel pipes or welded pipes. The common characteristics of the cold working method of steel pipes are high dimensional accuracy and good surface roughness. It can produce very thin (up to 0.05~0.01mm) thin-walled tubes and very thin (up to 0.3~0.1 mm in diameter) capillaries.
Precision Steel Tube,Cold Drawn Steel Pipe,Cold Rolled Steel Pipe,Precision Seamless Tube Shandong Guanzhou Iron and Steel Group Co., Ltd. , https://www.guanzhouiron.com
Generally, the production process of seamless Steel Pipe can be divided into cold rolling and hot rolling. The appearance of cold-rolled seamless steel pipe is shorter than that of hot-rolled seamless steel pipe. The wall thickness of cold-rolled seamless steel pipe is generally smaller than that of hot-rolled seamless steel pipe. But the surface looks brighter than that of thick wall seamless steel pipe. The surface is not too rough, and the diameter is not too much burr.
In order to obtain seamless pipes with smaller size and better quality, cold rolling, cold drawing or a combination of the two methods must be used.
High precision cold drawn precision steel pipe is a new type of steel pipe, which is mainly characterized by high precision. There are usually two production processes of two high mill and three high mill. The precision of three high mill in producing cold rolled seamless steel pipe is higher, which can be controlled within a few wires, but the price is relatively higher.
The product specification range of cold rolled steel pipe is: outer diameter 4.0 ~ 450mm; The wall thickness is 0.04 ~ 60mm. Compared with the cold drawing method, the advantage of the periodic cold rolling method is that the shrinkage of the pass surface is large, there is no need for difficult head, and the yield is high.
Implementing the principle of strengthening the power grid on the increase of the proportion of power grid investment