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A method for improving the qualified rate of flaw detection of 14-30mm q345c steel plate

A pass rate, steel plate technology, applied in the manufacture of converters, etc., can solve the problems of low pass rate of flaw detection, high production cost, waste of raw materials, etc.

Active Publication Date: 2022-04-22
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Both of the above two Q345C steel plates can meet the requirements of use, but the pass rate of flaw detection is low, the production cost is high, and the waste of raw materials is caused

Method used

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  • A method for improving the qualified rate of flaw detection of 14-30mm q345c steel plate
  • A method for improving the qualified rate of flaw detection of 14-30mm q345c steel plate
  • A method for improving the qualified rate of flaw detection of 14-30mm q345c steel plate

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Embodiment

[0027]A method for improving the qualified rate of flaw detection of 14-30mm Q345C steel plate, comprising Q345C steel plate and the production method of said Q345C steel plate; the chemical composition (unit, wt%) of said Q345C steel plate is: C: 0.15-0.18, Si: 0.20~0.40, Mn: 1.25~1.35, P: ≤0.025, S: ≤0.005, Ti: 0.015~0.025, Als: 0.015~0.030, others are Fe and residual elements.

[0028] The production method of described Q345C steel plate comprises the following steps: hot metal KR desulfurization, converter smelting, LF refining, continuous casting, billet sending and rolling;

[0029] Hot metal KR desulfurization: shallow desulfurization is adopted according to the S content of molten iron to ensure that the sulfur content of molten iron in converter smelting after desulfurization is ≤0.010%;

[0030] Converter smelting: C content at the end of the converter tapping ≥ 0.06%, to prevent over-oxidation of molten steel; tapping temperature ≥ 1650 ° C, to ensure that the tempe...

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Abstract

The invention provides a method for improving the qualified rate of flaw detection of Q345C steel plates with a specification of 14 to 30 mm, which belongs to the technical field of production of medium-thick steel plates, and includes Q345C steel plates and a production method of the Q345C steel plates; the chemical composition of the Q345C steel plates (unit, wt%) ) is: C: 0.15-0.18, Si: 0.20-0.40, Mn: 1.25-1.35, P: ≤0.025, S: ≤0.005, Ti: 0.015-0.025, Als: 0.015-0.030, and others are Fe and residual elements. In the production of the present invention, the Q345C process technology is strictly controlled, including strict control of the sulfur content and manganese content of the finished product; when the billet surface temperature is higher than the third brittle temperature range of steel at 900°C or higher when the billet is straightened, when the secondary cooling water temperature is ≤35°C , The specific water volume of the secondary cooling is controlled by 0.42L / kg. When the temperature of the secondary cooling water is > 35°C, the specific water volume of the secondary cooling is controlled by 0.48L / kg; Through the implementation of the invention, the passing rate of flaw detection of rolled 14-30mm Q345C steel plate is increased from 98.40% to 99.80%, and the passing rate has been improved.

Description

technical field [0001] The invention relates to the technical field of production of medium-thick steel plates, in particular to a method for improving the qualified rate of flaw detection of Q345C steel plates with a specification of 14 to 30 mm. Background technique [0002] With the development of the economy, the demand for steel products in all walks of life is increasing day by day, and the requirements are getting higher and higher. Q345C is a low-alloy high-strength steel with good comprehensive mechanical properties and process properties, and is widely used in engineering fields such as steel structures and wind towers. Domestically produced steel sheets of this specification are mainly designed with C, Mn and other elements in the composition design, of which the C content is about 0.11-0.17wt%, and the Mn content is about 1.30-1.60wt%. The qualified rate of flaw detection of Q345C steel plate has not been broken through, especially the qualified rate of flaw det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/14C21C1/02C21C5/28C21C7/06C21C7/064C21C7/072
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/14C21C1/02C21C5/28C21C7/06C21C7/072C21C7/064
Inventor 康文举许少普赵迪冯晓光朱先兴袁高俭任义杨春李嘎子白艺波王勇
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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