Heat treatment process for steel of transmission line tower
A transmission line, chemical heat treatment technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problem that the strength and specifications are not suitable for large-capacity and high-voltage transmission lines, and can not meet the requirements of large-load towers. and other problems, to achieve the effect of low crack sensitivity, increased strength and high yield strength
Inactive Publication Date: 2015-05-06
STATE GRID CORP OF CHINA +1
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[0004] With the development, there have been multi-circuit 110KV, 220KV, 330KV, 500KV lines on the same tower and 750KV, 1000KV transmission lines with higher and higher voltage levels. The bigger the tower, the higher the tower. The strength and specifications of the traditional hot-rolled angle steel are not suitable for the development of large-capacity and high-voltage transmission lines, and cannot meet the requirements for the use of large-load towers.
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[0030] The invention adopts a chemical heat treatment process for the steel used in the transmission line pole tower, and uses a special heat treatment stove to firstly carry out carburizing treatment on the steel material, perform quenching, and then perform low-temperature tempering treatment on the steel material.
[0031] The temperature range of tempering treatment is controlled at 160°C--200°C;
[0032] First, the process of putting the workpiece into a chemical heat treatment furnace and heating it in a gas medium, and carburizing it is called gas carburizing. Gas carburizing is generally composed of enriched gas (seeding agent) and diluted gas. A certain positive pressure should be maintained in the gas carburizing furnace, and a fan should be installed to make the atmosphere in the furnace uniform, so as to correctly control the carbon potential and ensure the quality of carburizing (carbon potential refers to the change of carbon quality on the surface of the workpie...
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The invention relates to a heat treatment process for steel of a transmission line tower. The heat treatment process comprises the following steps of: putting a workpiece into a chemical heat treatment process furnace; heating in a gas medium; performing gas carburization, wherein the dripping amount of a penetrating agent is controlled by a two-stage method; and quenching, and performing low-temperature tempering treatment, wherein the temperature range of the tempering treatment is controlled to be between 160 and -200 DEG C. Low-carbon carbon structure steel with low cost is adopted and is converted into a composite material with high-carbon steel on the surface layer and low-carbon steel in the core by the chemical heat treatment process. The structural material of angle steel applied to the transmission line tower is subjected to the chemical heat treatment, and the strength, rigidity, fatigue resistance, tensile yield strength, corrosion resistance, high plasticity and high toughness of the steel are improved. The steel subjected to the chemical heat treatment has high strength, high tensile yield strength, low crack sensitivity, high corrosion resistance and high toughness, and can be naturally recovered after bent by force.
Description
technical field [0001] The invention relates to a heat treatment process for steel materials, in particular to a heat treatment process for angle steel, a pole and tower structural material of a power transmission line. Background technique [0002] Since the angle steel used in the transmission line pole tower structure in the past is mostly made of high-quality carbon structural steel, which is directly assembled with the iron tower, its tensile strength value, yield strength value, impact toughness, etc., can only rely on the properties of the steel itself. Regardless of the country, so far, the load on the tower has relied on the strength, stiffness and yield strength of the steel itself. The performance of the steel itself determines the strength, high plasticity and toughness, low crack sensitivity, corrosion resistance, etc. of the steel. [0003] With the rapid development of the power industry, large-capacity and high-voltage transmission lines have been rapidly de...
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IPC IPC(8): C23F17/00C23C8/22C21D1/18
Inventor 杜中庆闵尊南陈跃中黄文华钟庭剑叶茂王美英涂强
Owner STATE GRID CORP OF CHINA