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Super-thick low alloy high strength Q345C steel plate and production method thereof

A low-alloy, high-strength, production method technology, applied in the field of medium-thick steel plate production, can solve problems such as special requirements for process equipment and difficult production

Inactive Publication Date: 2012-03-07
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Q345C steel plate with a thickness of more than 180mm cannot be produced due to its difficulty in production and special requirements for process equipment. At present, there are few domestic manufacturers that stably produce this steel plate

Method used

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  • Super-thick low alloy high strength Q345C steel plate and production method thereof
  • Super-thick low alloy high strength Q345C steel plate and production method thereof
  • Super-thick low alloy high strength Q345C steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Through converter smelting, LF refining, vacuum refining, pouring, heating, rolling, controlled cooling, slow cooling, and heat treatment processes, the finished steel of extra-thick, low-alloy, high-strength Q345C steel plate with the chemical composition described in Table 1 below is obtained, and each process parameter And the mechanical properties are shown in Tables 4 and 5 below.

[0038] Table 1 Chemical composition of steel in Example 1

[0039] C(%) Si(%) Mn(%) P(%) S(%) Nb+Ni+Cr(%) AlS(%) 0.158 0.30 1.41 0.013 0.003 ≤0.20 0.035

Embodiment 2

[0041] Through converter smelting, LF refining, vacuum refining, pouring, heating, rolling, controlled cooling, slow cooling, and heat treatment processes, the finished product steel of ultra-thick, low-alloy, high-strength Q345C steel plate with the chemical composition described in Table 2 below is obtained, and each process parameter And the mechanical properties are shown in Tables 4 and 5 below.

[0042] Table 2 Chemical Composition of Steel in Example 2

[0043] C(%) Si(%) Mn(%) P(%) S(%) Nb+Ni+Cr(%) AlS(%) 0.160 0.36 1.45 0.013 0.004 ≤0.20 0.034

Embodiment 3

[0045] Through converter smelting, LF refining, vacuum refining, pouring, heating, rolling, controlled cooling, slow cooling, and heat treatment processes, the finished product steel of ultra-thick, low-alloy, high-strength Q345C steel plate with the chemical composition described in Table 3 below is obtained, and each process parameter And the mechanical properties are shown in Tables 4 and 5 below.

[0046] Table 3 Chemical Composition of Steel in Example 3

[0047] C(%) Si(%) Mn(%) P(%) S(%) Nb+Ni+Cr(%) AlS(%) 0.165 0.40 1.39 0.014 0.002 ≤0.20 0.040

[0048] The process route of the present invention: molten iron KR deep desulfurization→converter smelting→LF refining→VD vacuum treatment→casting ingot pouring→steel ingot slow cooling→heating→phosphorus removal→controlled rolling→controlled cooling→controlled straightening→off-line slow cooling →surface inspection→heat treatment→finishing→flaw detection→testing→judgment→qualified product stor...

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Abstract

The invention discloses a super-thick low alloy high strength Q345C steel plate which comprises the following chemical components by mass (unit: wt %): C 0.08 to 0.18, Si 0.20 to 0.40, Mn 1.15 to 1. 50, P <=0.018, S <=0.005, micro-alloying elements of (Nb+Ni+Cr) <=0.020 and Als <= 0.040, with the rest being Fe and residual elements. Carbon equivalent satisfies the following equation: [Ceq=C+Mn / 5+(Cr+Mo+V) / 5+(Ni+Cu) / 15]<=0.43. According to the invention, total grade level of a variety of impurities is enabled not to exceed 2.5 by carrying out a series of processes of converter smelting, LF refining, vacuum refining, casting, heating, rolling, controlled cooling, slow cooling and heat treatment, designing the chemical composition of multielement composite micro-alloy elements and guaranteeing the cleanliness of steel by using the technology of LF+VD, and the grain size of steel is enabled to reach grade 8.0-10.0 through the processing of controlled rolling, controlled cooling and normalization; effective implementation of above-mentioned measures enables the super-thick low alloy high strength Q345C steel plate to be successfully manufactured.

Description

[0001] technical field [0002] The invention belongs to the technical field of production of medium-thick steel plates, and in particular relates to an extra-thick, low-alloy, high-strength Q345C steel plate and a production method thereof. Background technique [0003] Q345C steel is a kind of extra-thick low-alloy high-strength steel plate, which has high strength, good cold deformation ability, good plasticity and low temperature impact resistance, and is widely used in daily production fields. Numerous studies. However, Q345C steel plate with a thickness of more than 180mm cannot be produced because of its difficulty in production and special requirements for process equipment. At present, there are few domestic manufacturers that stably produce this steel plate. Contents of the invention [0004] The purpose of the present invention is to avoid the disadvantages of the above-mentioned prior art, and to provide an extra-thick, low-alloy, high-strength Q345C steel pla...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C33/04C21D8/02
CPCY02P10/20
Inventor 朱书成袁少威许少普张立新崔冠军刘庆波陈景雪张智慧郭艳芳朱成杰庞百鸣雷文慧高照海
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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