A preparation method of 600mpa ultra-high-strength anti-seismic steel bar

An anti-seismic reinforcement and ultra-high-strength technology, which is applied in the manufacturing process of reinforcement, can solve problems such as unevenness, excessive pearlite structure, and insufficient reinforcement strength, and achieve the effects of uniform distribution, excellent mechanical properties, and uniform size

Active Publication Date: 2021-07-20
福建三宝钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problems that the present invention aims to solve include improving the strength of steel bars, preventing brittle fracture, and avoiding excessive and uneven pearlite structures inside steel bars.

Method used

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  • A preparation method of 600mpa ultra-high-strength anti-seismic steel bar
  • A preparation method of 600mpa ultra-high-strength anti-seismic steel bar

Examples

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specific Embodiment

[0032] Billet smelting is carried out in the production mode of large tonnage (100T) converter-LF furnace refining-RH furnace vacuum treatment-250mm section casting machine. Converter smelting molten iron requires P≤0.110%, S≤0.010%, molten iron temperature ≥1300°C, after smelting, the steel is deoxidized by elements forming weak oxides during the tapping process, and the feeding sequence of tapping is: active lime-manganese alloy-silicon system alloy. The amount of active lime added is 350-450kg, and 30kg of calcium carbide is added when tapping. Keep the argon fully open from the beginning of tapping to 3 / 4 of tapping, and then switch to a small flow rate. After tapping, the small flow rate is turned on at 200L / min×3-5 minutes. The temperature after the furnace is ≥1540°C. During the treatment process of LF furnace, it is required to keep the white slag for ≥15 minutes, and adjust the composition to the target composition. When heating, maintain the submerged arc operatio...

Embodiment 1

[0042] 1) Adding carbide alloying elements: feeding V alloy wire, the feeding amount is 490 meters, and the total amount of the alloying elements after the control is increased to 450PPm. Then immediately blow argon gas weakly through the bottom of the tank and stir. The flow rate of argon gas is controlled according to the diameter (average diameter length) of the exposed surface of the molten steel at the gas outlet point of 78 mm. The stirring time is 8 minutes, and the temperature is controlled at 1100 ° C.

[0043] 2) After the addition of carbide alloy elements is completed, cast on the continuous casting machine within 9 minutes, control the superheat of the tundish at 15-25°C, and control the size of the cast slab. The cast slab obtained is soaked in a temperature range of 1150° C., and then sprayed with high-pressure water to remove the iron oxide scale on the surface of the slab.

[0044] 3) Cast billets are rolled: the rolling temperature range is 1000°C, and the ti...

Embodiment 2

[0047] 1) Adding carbide alloying elements: feeding Nb alloy wire, the feeding amount is 350 meters, and the total amount of the alloying elements after the control is increased to 340PPm. Then immediately blow argon gas weakly through the bottom of the tank and stir. The flow rate of argon gas is controlled according to the diameter (average diameter length) of the exposed surface of the molten steel at the gas outlet point of 69 mm. The stirring time is 8 minutes, and the temperature is controlled at 1050 ° C.

[0048] 2) After the addition of carbide alloy elements is completed, cast on the continuous casting machine within 9 minutes, control the superheat of the tundish at 15-25°C, and control the size of the cast slab. The cast slab obtained is soaked in a temperature range of 1150° C., and then sprayed with high-pressure water to remove the iron oxide scale on the surface of the slab.

[0049] 3) Cast billets are rolled: the rolling temperature range is 1100°C, and the f...

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Abstract

The preparation method of the ultra-high-strength anti-seismic steel bar of the present invention prepares the steel bar by controlling the microstructure and morphology of the steel bar, and the steps include adding alloy elements, continuous casting, hot rolling and cooling. The manufactured high-strength and high-toughness steel bar has the following characteristics: 1) By controlling the process steps and parameters, the finished steel bar with almost all pearlite structure is obtained. The size of the pearlite structure is uniform, the average distribution is below 35 μm, and the distribution is uniform; 2) Regulate the type and content of alloying elements, cooperate with the process parameters, control the formation of non-chromium carbides, and evenly distribute the ferrite between the pearlite layers Above; 3) The finished steel bar has excellent mechanical properties, its yield strength and tensile strength exceed 600MPa, taking into account both high strength and toughness, and has ultra-high strength and anti-seismic performance.

Description

technical field [0001] The invention relates to a manufacturing process of steel bars, in particular to a method for preparing 600MPa ultra-high-strength earthquake-resistant steel bars. Background technique [0002] Steel bars are the basic materials of modern buildings, widely used in the construction of houses, bridges, roads, etc., and their performance directly affects the life and safety of concrete components. At present, my country is in the stage of rapid urbanization development, real estate and infrastructure construction are booming, and the production and consumption of steel bars rank first in the world. [0003] By increasing the strength and corrosion resistance of steel bars, reducing the amount of steel used and prolonging the service life to achieve the effect of energy saving and emission reduction, it has attracted more and more attention from metallurgical science and technology workers and government industries. Before the 1990s, Western Europe, North...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21D8/08C21C7/00C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/06
CPCC21C7/0056C21D8/08C21D2211/002C21D2211/004C21D2211/009C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 王光文唐名标熊科林涂文兴
Owner 福建三宝钢铁有限公司
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