Stepping type heating furnace for heat treatment
A walking heating furnace and walking beam technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as increasing equipment operating costs, increasing enterprise production costs, affecting product qualification rates, etc., and reducing control accuracy requirements, energy savings, avoidance of tissue differences and effects of outer diameter deformation
Inactive Publication Date: 2014-04-09
TIANJIN UNIV OF COMMERCE
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Problems solved by technology
However, due to the design reasons of the tooth shape, pitch and horizontal stroke on the fixed beam of the walking heating furnace and the walking beam, when the casing rolls on the working edge of the tooth, it rolls from the top of the tooth to the bottom of the tooth. The bottom of the tooth stays for a certain period of time, which cannot completely change the problem of uneven heating caused by the structural design of the heating furnace itself
Moreover, it is difficult to implement strict temperature control requirements, which not only increases the operating cost of the equipment, but also increases the production cost of the enterprise. A slight error will cause the product to be unqualified and affect the pass rate of the product.
At the same time, increasing the number of burners also increases energy consumption
Method used
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Embodiment 1
[0075] The oil casing is taken as an example for description below.
[0076] The composition of the material is shown in Table 1.
[0077] Table 1
[0078]
[0079] The heating furnace is divided into two heating sections, heating and soaking, along the length of the furnace, and each section is divided into four areas in the direction of the furnace length for combustion and temperature control. The furnace uses high-speed end burners for heating. Each area is equipped with 2 high-speed natural gas burners, the number of burners, and the burner capacity is 4.56×10 5 kJ / h, heat supply per area 9.12×10 5 kJ / h; set 2 natural gas high-speed burners in each area of the soaking section, the number of burners, the burner capacity 1.53×10 5 kJ / h, heat supply per area 3.06×10 5 kJ / h. The temperature difference in the furnace in the first zone of the heating section shall not exceed ±20°C, the temperature difference in the second zone shall not exceed ±18°C, the temperature d...
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The invention discloses a stepping type heating furnace for heat treatment. The stepping type heating furnace has the advantages that the longest rolling distance of a sleeve is enabled to be smaller than the length of working sides, so that the sleeve cannot stop at tooth bottoms, the heating is more uniform, the requirements on heating temperature control accuracy can be lowered, and the energy sources are saved. According to the stepping type heating furnace, a right-angle triangle is formed by a vertical line passing through the tooth top of each working tooth, a horizontal line passing through the tooth bottom of the same working tooth, and a straight line interconnecting the tooth top and tooth bottom of the working tooth, the angle of the right-angle triangle in which the tooth top is located is 78 degrees, the angle in which the tooth bottom is located is 12 degrees, the connecting line of the tooth top and tooth bottom of the working tooth serves as one working side, the working side is of a tooth shape with an exponential curve, and the exponential curve is a formula shown in a drawing. Due to the tooth shape design, the longest rolling distance of the sleeve is enabled to be smaller than the length of working sides when the sleeve rolls on the working sides of the teeth of a stepping beam and a fixed beam, so that the sleeve cannot stop at the tooth bottoms, the heating is more uniform, the generation of tissue difference and external diameter deformation is avoided, and the quality of produces is improved.
Description
technical field [0001] The invention belongs to the field of heat treatment of metal materials, in particular to a walking heating furnace for heat treatment and a heat treatment method. Background technique [0002] Special oil pipe refers to a kind of oil pipe, casing and drill pipe specially used for oil and natural gas exploration, drilling and production. It is an important equipment in the oil industry. Domestic oil special pipe is mainly made of hot rolling or cold drawing. [0003] With the continuous increase of oil consumption and the improvement of the overall level of my country's equipment manufacturing industry, my country's oil drilling and production special equipment manufacturing industry has developed rapidly. However, due to the particularity of oil production safety, special oil pipes have the characteristics of high technological content and high added value. The required mechanical properties, corrosion resistance, and dimensional accuracy are very hig...
Claims
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IPC IPC(8): C21D9/08C21D1/52
Inventor 李连进王惠斌王东爱张海军乔志霞宗卫兵张传友
Owner TIANJIN UNIV OF COMMERCE