Low-cost chromium-containing Q460MC steel plate and production method thereof

A production method and low-cost technology, applied in the field of steel rolling, can solve problems such as unfavorable green development and increased production costs, and achieve the effects of reducing production costs, improving weldability, and improving welding performance

Active Publication Date: 2020-07-31
HEBEI PUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the Q460C low-alloy steel plates developed by major domestic steel mills adopt high C-Nb-V alloying design. If the energy-saving and environmental protection technology of TMCP controlled rolling and controlled cooling is used instead, more precious metals such as V need to be added, which is relatively expensive. The addition of precious metals such as multi-V is not conducive to the needs of green development, and at the same time, the production cost will also be greatly increased. Taking the current 50-grade ferrovanadium as an example, the price per ton is between 200,000 and 250,000. The conventional addition in the industry Calculated with 0.060% V, the cost per ton of steel is not less than 250 yuan. Therefore, the research and development does not add V elements and adopts a lower C content design. While obtaining excellent strength and toughness indicators, the alloy cost is greatly reduced to meet the requirements of Q460MC Various performance requirements for steel plates are imminent

Method used

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  • Low-cost chromium-containing Q460MC steel plate and production method thereof
  • Low-cost chromium-containing Q460MC steel plate and production method thereof
  • Low-cost chromium-containing Q460MC steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A low-cost chromium-containing Q460MC steel plate, the chemical composition and weight percentage of each component are: C: 0.08%-0.11%, Si: 0.10%-0.20%, Mn: 1.30%-1.60%, P: ≤0.020 %, S: ≤0.005%, Als: 0.015%~0.035%, Nb: 0.030%~0.040%, Cr: 0.15%~0.25%, Ti: 0.010%~0.020%, and the rest are Fe and unavoidable impurities;

[0054] In step A, the slag thickness is 42mm, the oxygen concentration in the converter is 363ppm, and the tapping time is 4min;

[0055] In step B, the retention time of white slag is 16 minutes, and the time of soft argon blowing is 9 minutes;

[0056] In step D, the temperature in the heating section is 1200°C, the temperature in the soaking section is 1130°C, and the heating time is 3.5h;

[0057] In step E, the rough rolling start temperature is 1050°C, the rough rolling finish temperature is 965°C, the rolling pass is 10 passes, the rough rolling final pass pressure ratio is 21%, and the minimum intermediate billet thickness is 50mm;

[0058] In s...

Embodiment 2

[0068] A low-cost chromium-containing Q460MC steel plate, the chemical composition and weight percentage of each component are: C: 0.08%-0.11%, Si: 0.10%-0.20%, Mn: 1.30%-1.60%, P: ≤0.020 %, S: ≤0.005%, Als: 0.015%~0.035%, Nb: 0.030%~0.040%, Cr: 0.15%~0.25%, Ti: 0.010%~0.020%, and the rest are Fe and unavoidable impurities;

[0069] In step A, the slag thickness is 40mm, the oxygen concentration in the converter is 457ppm, and the tapping time is 4min;

[0070] In step B, the retention time of white slag is 18 minutes, and the time of soft argon blowing is 9 minutes;

[0071] In step D, the temperature in the heating section is 1250°C, the temperature in the soaking section is 1180°C, and the heating time is 3.0h;

[0072] In step E, the starting temperature of rough rolling is 1075°C, the finishing temperature of rough rolling is 985°C, the rolling pass is 10 passes, the pressure ratio of the final pass of rough rolling is 20%, and the minimum thickness of the intermediate b...

Embodiment 3

[0083] A low-cost chromium-containing Q460MC steel plate, the chemical composition and weight percentage of each component are: C: 0.08%-0.11%, Si: 0.10%-0.20%, Mn: 1.30%-1.60%, P: ≤0.020 %, S: ≤0.005%, Als: 0.015%~0.035%, Nb: 0.030%~0.040%, Cr: 0.15%~0.25%, Ti: 0.010%~0.020%, and the rest are Fe and unavoidable impurities;

[0084] In step A, the slag thickness is 40mm, the oxygen concentration in the converter is 423ppm, and the tapping time is 4min;

[0085] In step B, the retention time of white slag is 16 minutes, and the time of soft argon blowing is 10 minutes;

[0086] In step D, the temperature in the heating section is 1250°C, the temperature in the soaking section is 1160°C, and the heating time is 3.2h;

[0087] In step E, the rough rolling start temperature is 1100°C, the rough rolling finish temperature is 990°C, the rolling pass is 8 passes, the rough rolling final pass pressure ratio is 24%, and the minimum intermediate billet thickness is 80mm;

[0088] In s...

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Abstract

The invention discloses a low-cost chromium-containing Q460MC steel plate and a production method thereof. The low-cost chromium-containing Q460MC steel plate comprises the following chemical components in percentages by weight: 0.08%-0.11% of C, 0.10%-0.20% of Si, 1.30%-1.60% of Mn, less than or equal to 0.020% of P, less than or equal to 0.005% of S, 0.015%-0.035% of Als, 0.030%-0.040% of Nb, 0.15%-0.25% of Cr, 0.010%-0.020% of Ti and the balance of Fe and inevitable impurities. The production method comprises the steps of converter smelting, refining, continuous casting, heating, rough rolling, finish rolling and cooling. Through the design of alloy components, no V element is added, the cheap Cr element is used for solution strengthening and hardenability improvement, the TMCP production process is optimized, and finally the steel plate with high strength, high toughness and low cost is obtained.

Description

technical field [0001] The invention relates to a low-cost chromium-containing Q460MC steel plate and a production method thereof, belonging to the technical field of steel rolling. Background technique [0002] The Q460C steel plate produced in China is mainly used in construction machinery, and is one of the important engineering structural materials. It is used in the field of construction machinery such as coal mine hydraulic supports. In order to respond to the needs of customers in the construction machinery industry such as coal mining machinery for weldability, toughness and ductility, and to implement the national green development plan, the production process of Q460C steel plate is gradually changing from the initial hot rolling and controlled rolling to TMCP controlled rolling and controlled cooling. With the development of energy-saving and environmental protection technology, my country officially implemented the new version of the national standard GB / T 1591-20...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/26C22C38/28C22C38/06C22C38/04C22C38/02C22C33/06C21D8/02
CPCC21D8/0205C21D8/0226C22C33/06C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C38/38
Inventor 付中原郑磊关秀格庞洪轩王智聪郭恩元郭龙鑫陈建超郭潇和珍宝任新凯
Owner HEBEI PUYANG IRON & STEEL
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