Method for producing 500 Mpa high strengh threaded reinforced bar

A threaded steel bar and production method technology, applied in temperature control, workpiece surface treatment equipment, metal rolling, etc., can solve problems such as increased production costs and complex smelting production processes, so as to save steel, shorten project construction period, and increase benefits Effect

Inactive Publication Date: 2006-06-28
双菱钢铁集团控股有限公司
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Problems solved by technology

However, due to the addition of alloying elements, the smelting production process is more complicated, which will inevitably increase the production cost

Method used

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  • Method for producing 500 Mpa high strengh threaded reinforced bar

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Embodiment Construction

[0017] figure 1 Shown is the embodiment of the production method of 500Mpa high-strength threaded steel bar of the present invention, comprises the following steps:

[0018] a. Use ordinary 20MnSi steel billet, whose chemical composition is shown in Table 1, and keep the starting rolling temperature at 880-950°C in an ultra-low temperature method. Cooling through water cooling, the number of pre-piercing water sections can be 1-3, the water pressure is normal pressure, and the temperature after pre-piercing water is 850-950°C;

[0019] b. After the steel passes through the water-piercing section, it enters the finish rolling unit, and the power of the main motor is 1350KW; then it enters the water-piercing cooling section to rapidly reduce the surface temperature of the rolled piece. The number of sections in the water-piercing cooling section is 1 to 5 sections, The water pressure is 0.8-1.2Mpa, so that the surface temperature of the steel upper cooling bed is controlled at ...

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Abstract

A method for manufacturing the high-strength (500 MPa) threaded reinforcing bar includes such steps as providing 20MnSi steel bullet at 880-950 deg.C, cogging, middle rolling, pre-cooling by passing through water curtain, final rolling, cooling by passing through water curtain, and air cooling to release heat from its core for self tempering.

Description

technical field [0001] The invention relates to a production process method of steel bars, in particular to a production method of 500Mpa high-strength threaded steel bars. Background technique [0002] Threaded steel bars play a skeleton role in industrial plants, reservoir dams, road bridges and other buildings. At present, all domestic iron and steel enterprises use 20MnSi billets to produce HRB335 rebar. However, the strength of the existing HRB335 grade threaded steel bar is low, especially in the construction of large-scale projects, the shortcomings of the steel structure are relatively large, the cost of the project is high, and the construction period of the project is long. Advanced industrial countries have already eliminated HRB335. Grade steel bars. In order to improve the strength of steel bars, iron and steel enterprises all use microalloying elements in steel billets, that is, vanadium (V), niobium (Nb), titanium (Ti) and other alloys are added when smeltin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/16B21B37/46B21B37/74B21B45/02
Inventor 丁之坤吴少文康胜利李勤川朱席龙
Owner 双菱钢铁集团控股有限公司
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