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Method for producing level 600MPa fine-grain high-strength aseismic reinforced bars

An earthquake-resistant steel bar and a production method technology, applied in the field of steel bar production technology, can solve problems such as blanks of 600MPa-level fine-grained high-strength seismic-resistant steel bars, and achieve the effects of improving seismic performance, increasing tensile strength, and increasing strength.

Inactive Publication Date: 2014-07-09
张家港联峰钢铁研究所有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A few countries such as South Korea, Japan, and the United States have started 600MPa high-strength rebar. At present, a few manufacturers in my country have tried to produce 600MPa high-strength rebar, but there is still no 600MPa fine-grained high-strength seismic rebar.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of 600MPa class φ 10mm fine-grained high-strength seismic steel production method, comprises the following steps: 1, steel billet inspection furnace loading: the chemical composition of steel billet comprises carbon 0.25%, silicon 0.65%, manganese 1.00%, phosphorus 0.009%, sulfur by mass percentage 0.015%, vanadium 0.150%, chromium 0.32%, and the rest is iron; Ⅱ. Heating furnace heating and bar rolling mill: heating the billet in the heating furnace, and sending it into the bar rolling mill at a temperature of 1000℃~1200℃ Rolled into semi-finished steel bars, the temperature control of the specific rolling process is as follows: the rolling start temperature is about 1080 ° C, the temperature of the upper cooling bed is about 980 ° C; MPa, and set different water penetration pressures according to the specifications of the steel bars to ensure that the steel bars are put into the cooling bed when the temperature drops below 1000°C; the final rolling speed is 15m / s...

Embodiment 2

[0029] The difference between embodiment 2 and embodiment 1 is that the steel bar of φ16mm is produced, and the chemical composition of the billet in terms of mass percentage includes 0.25% carbon, 0.66% silicon, 1.05% manganese, 0.012% phosphorus, 0.017% sulfur, 0.152% vanadium, chromium 0.33%, the rest is iron. The temperature control of the rolling process is as follows: the rolling start temperature is about 1060°C, and the upper cooling bed temperature is about 970°C. The water penetration pressure is 0.7MPa, and the final rolling speed is 13m / s.

[0030] The final mechanical properties Rel is 640-658 MPa, Rm is 822-838 MPa, Rm / Rel is 1.25-1.27, A is 18-20%, Agt is 10.5-11.5%, grain size is 10-10.5; yield strength reaches 600MPa , the strength-to-yield ratio and Agt index meet the seismic requirements, and the grain size meets the fine-grain requirements. The metallographic structure of the steel bar is: both the edge and the core are "ferrite + pearlite", and there is ...

Embodiment 3

[0032] The difference between embodiment 3 and embodiment 1 is that the φ40mm steel bar is produced, and the chemical composition of the steel billet in step I includes 0.26% carbon, 0.63% silicon, 1.08% manganese, 0.010% phosphorus, 0.016% sulfur, and 0.155% vanadium. %, 0.35% chromium, and the rest is iron. The temperature control in the rolling process is as follows: the rolling start temperature is about 1040°C, and the upper cooling bed temperature is about 940°C. The water penetration pressure is 0.8MPa, and the final rolling speed is 5m / s.

[0033] The final mechanical properties Rel is 619-644MPa, Rm is 794-812 MPa, Rm / Rel is 1.26-1.28, A is 18-20%, Agt is 11.5-14.0%, grain size is 9.5-10; yield strength reaches 600MPa , the strength-to-yield ratio and Agt index meet the seismic requirements, and the grain size meets the fine-grain requirements. The metallographic structure of the steel bar is: both the edge and the core are "ferrite + pearlite", and there is no bain...

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Abstract

The invention discloses a method for producing level 600MPa fine-grain high-strength aseismic reinforced bars, which comprises the following steps of firstly, detecting a steel billet and putting the steel billet into a furnace, wherein the steel billet comprises the following chemical compositions in percentage by mass: 0.24-0.28% of carbon, 0.62-0.80% of silicon, less than 1.30% of manganese, less than 0.035% of phosphorus, less than 0.035% of sulfur, 0.10-0.20% of vanadium, 0.20-0.50% of chromium, and the balance of iron; then, heating the steel billet by using a heat furnace, and rolling the steel billet by using a bar mill; enabling the obtained object to pass through water so as to control the obtained object to be cooled; naturally cooling by using a cooling bed, shearing, finishing and warehousing. In the method for producing level 600MPa fine-grain high-strength aseismic reinforced bars, chrome and vanadium microalloyed components are adopted, so that a V (C, N) compound is formed in steel by using vanadium, thereby greatly increasing the strength of the steel; meanwhile, a certain amount of chromium is added, so that the aseismic performance of reinforced bars is obviously improved, and finally, the mechanical performance index of the reinforced bars meets the level 600MPa fine-grain high-strength aseismic requirements. The metallographic structure of each reinforced bar is as follows: an edge part and a core part are respectively of ferrite and pearlite as well as bainite and edge tempered structure having no influence on usability.

Description

technical field [0001] The invention relates to a steel bar production process, in particular to a production method for 600MPa fine-grained high-strength earthquake-resistant steel bars. Background technique [0002] At present, the country is vigorously promoting the application of high-strength steel bars. The widespread use of high-strength steel bars can effectively promote the reduction of the steel industry and at the same time effectively reduce the consumption of resources. [0003] A few countries such as South Korea, Japan, and the United States have started 600MPa high-strength rebar. At present, a few manufacturers in my country have tried to produce 600MPa high-strength rebar, but there is still no 600MPa fine-grained high-strength seismic rebar. Contents of the invention [0004] In view of the fact that there is no production process for 600MPa grade fine-grained high-strength seismic steel bars in China, the purpose of this invention is to propose a produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C21D8/08
Inventor 王云川张先轶庄清玉朱爱华王传超
Owner 张家港联峰钢铁研究所有限公司
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