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700MPa-grade hot-rolled coiled steel and production method thereof

A production method, the technology of coiling snails, applied in the field of metallurgy, can solve the problems of incompatibility of strength, toughness, and plasticity, etc., and achieve the effects of suppressing recovery and recrystallization problems, improving strength, and suppressing phase transformation

Active Publication Date: 2021-03-09
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the strength of the existing high-strength hot-rolled coil steel needs to be further improved, and the strength, toughness and plasticity cannot be matched, the present invention provides a 700MPa grade hot-rolled coil steel and its production method

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  • 700MPa-grade hot-rolled coiled steel and production method thereof

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Effect test

Embodiment 1

[0034] The embodiment of the present invention provides a kind of 700MPa grade hot-rolled coil steel, the specification is 6mm, and its chemical composition is:

[0035] C 0.23%, Si 0.20%, Mn 0.90%, V 0.22%, N 0.0258%, Cr 0.25%, Nb 0.022%, P 0.018%, S 0.019%, and the balance is Fe and inevitable impurities.

[0036] The production method of the above-mentioned 700MPa grade hot-rolled coil steel is as follows:

[0037] Step 1, continuous casting process: using scrap steel as raw material, the continuous casting billet with the above chemical composition is obtained through the steelmaking process, and the temperature of the billet hot charging into the furnace is 680°C;

[0038] Step 2. Heating process: the temperature of the preheating section is 850 °C, the temperature of the heating section is 1110 °C, the temperature of the soaking section is 1180 °C, and the temperature of the casting billet is 1160 °C;

[0039] Step 3, rolling process: the temperature at the beginning of r...

Embodiment 2

[0043] The embodiment of the present invention provides a 700MPa-grade hot-rolled coil steel with a specification of 8mm, and its chemical composition is:

[0044] C 0.24%, Si 0.22%, Mn 0.95%, V 0.225%, N 0.0285%, Cr 0.28%, Nb 0.025%, P 0.020%, S 0.022%, and the balance is Fe and inevitable impurities.

[0045] The production method of the above-mentioned 700MPa grade hot-rolled coil steel is as follows:

[0046] Step 1, continuous casting process: using scrap steel as raw material, the continuous casting billet with the above chemical composition is obtained through the steelmaking process, and the temperature of the billet hot charging into the furnace is 650°C;

[0047] Step 2, heating process: the temperature of the preheating section is 880 °C, the temperature of the heating section is 1160 °C, the temperature of the soaking section is 1180 °C, and the temperature of the casting billet is 1120 °C;

[0048] Step 3, rolling process: the temperature at the start of rough ro...

Embodiment 3

[0052] The embodiment of the present invention provides a 700MPa-grade hot-rolled coil steel with a specification of 10mm, and its chemical composition is:

[0053] C 0.25%, Si 0.25%, Mn 1.00%, V 0.230%, N 0.030%, Cr 0.32%, Nb 0.030%, P 0.028%, S 0.025%, and the balance is Fe and inevitable impurities.

[0054] The production method of the above-mentioned 700MPa grade hot-rolled coil steel is as follows:

[0055] Step 1, continuous casting process: using scrap steel as raw material, the continuous casting billet with the above chemical composition is obtained through the steelmaking process, and the temperature of the billet hot charging into the furnace is 620°C;

[0056] Step 2. Heating process: the temperature of the preheating section is 900 °C, the temperature of the heating section is 1180 °C, the temperature of the soaking section is 1200 °C, and the temperature of the casting billet is 1140 °C;

[0057] Step 3, rolling process: the temperature at the beginning of roug...

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Abstract

The invention relates to the technical field of metallurgy, and particularly discloses 700MPa-grade hot-rolled coiled steel and a production method thereof. The 700MPa-grade hot-rolled coiled steel comprises the following components of, in percentage by weight, 0.23%-0.28% of C, 0.20%-0.40% of Si, 0.90%-1.15% of Mn, 0.22%-0.24% of V, 0.025%-0.040% of N, 0.25%-0.45% of Cr, 0.02%-0.04% of Nb, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the balance Fe and inevitable impurities, and the 700MPa-grade hot-rolled coiled steel is prepared through the procedures of steelmaking, continuous casting, heating, rolling and cooling. Through component adjustment and process optimization, the prepared hot-rolled coiled steel can meet the performance requirements of 700MPa-grade hot-rolled coiled steel, and has the advantages of higher strength, higher toughness, higher plasticity, low production cost, high production efficiency and wide application prospects.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a 700MPa-grade hot-rolled coil steel and a production method thereof. Background technique [0002] Rebars with tensile strength and yield strength of 400MPa and above are called high-strength steel bars, and threaded steel bars with a diameter of 6mm to 12mm are called coiled steel bars. Compared with ordinary steel bars, coiled steel is a kind of steel bar material with high strength, excellent comprehensive performance, energy saving and environmental protection, long service life and high safety. With the continuous development of my country's construction industry, the demand for high-strength construction coil steel continues to increase, and the quality requirements for steel are increasingly demanding. Reinforced concrete will still be the main material used in building structures at this stage and even for a long time in the future. In order to make buildings have be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/26C21D8/06
CPCC22C38/02C22C38/04C22C38/24C22C38/26C22C38/001C21D8/065C21D2211/005C21D2211/009
Inventor 贾元海张俊粉张春雷高海刘效云张贺佳王晓飞高玲玲
Owner HEBEI IRON AND STEEL
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