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Low-alloy high-strength structural-steel extra-thick board Q460C and production method thereof

A low-alloy, high-strength, production method technology, applied in the field of steel production, can solve the problems of low guarantee of flaw detection, single heavy, thick specifications, etc.

Active Publication Date: 2011-05-04
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are not many domestic steel mills that can produce the known Q460C extra-thick plate, and there are few researches and reports at home and abroad.
In particular, Q460C steel plate, a low-alloy high-strength structural steel with a thickness of more than 100mm, cannot be produced because of its difficulty in production and special requirements for process equipment, especially for thicker specifications and large single pieces, and the steel ingot rolling yield rate extremely low

Method used

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  • Low-alloy high-strength structural-steel extra-thick board Q460C and production method thereof
  • Low-alloy high-strength structural-steel extra-thick board Q460C and production method thereof

Examples

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Effect test

Embodiment 1

[0022] Through KR desulfurization of molten iron, converter smelting (argon station), LF refining, VD vacuum degassing (Ca treatment), die casting pouring, ingot heating, descaling, 3800 rolling mill rolling, ACC cooling, straightening, steel plate stack cooling, normalization The pyrothermal treatment process obtains Q460C finished steel with the chemical composition described in Table 1 below, and its process parameters and mechanical properties are shown in Table 3 and 4 below.

[0023] Table 1: Chemical Composition of Steel in Example 1

[0024] C％

Embodiment 2

[0026] Through KR desulfurization of molten iron, converter smelting (argon station), LF refining, VD vacuum degassing (Ca treatment), die casting pouring, ingot heating, descaling, 3800 rolling mill rolling, ACC cooling, straightening, steel plate stack cooling, normalization The pyrothermal treatment process obtains Q460C finished steel with the chemical composition described in Table 2 below, and its process parameters and mechanical properties are shown in Table 3 and 4 below.

[0027] Table 2: Chemical composition of steel in Example 2

[0028] C％

Si%

Mn%

P％

S％

Als%

(Nb+Ti+V+Ni)%

0.162

0.34

1.56

0.012

0.003

0.029

0.217

[0029] The process route of the present invention: molten iron KR desulfurization → converter smelting (argon station) → LF refining → VD vacuum degassing (Ca treatment) → mold casting pouring → slow cooling of steel ingots → heating → descaling → 3800 mill rolling → ACC cool...

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Abstract

The invention discloses a low-alloy high-strength structural-steel extra-thick board Q460C and a production method thereof, the extra-thick board comprises the following chemical constituents in percentage by weight (with wt% as a unit): C: not more than 0.20, Si: not more than 0.60, Mn: 1.40-1.60, P: not more than 0.020, S: not more than 0.005, microalloying elements (V+Nb+Ti+Ni): not more than 0.25, Als: not less than 0.015, and the balance of Fe and residual elements. The microalloying elements are selected reasonably, the elements V, Nb, Ti, and Ni are added in best match, and therefore, the double effects of precipitation strengthening and fine-grain strengthening are fully exerted to ensure that each performance index of a pressure vessel board can meet the requirement of national standard on 120mm under the premise of not reducing plasticity and toughness.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a low-alloy high-strength structural steel Q460C extra-thick plate and a production method thereof. Background technique [0002] With the economic construction and social development of our country, it is required to greatly improve the strength and toughness of steel, develop varieties that meet different requirements, improve steel quality, reduce production costs, and develop human-friendly basic materials in accordance with the requirements of sustainable development. Become the main research direction of steel materials. At present, there are not many domestic steel mills capable of producing known Q460C extra-thick plates, and there are few researches and reports at home and abroad. In particular, Q460C steel plate, a low-alloy high-strength structural steel with a thickness of more than 100mm, cannot be produced because of its difficulty in production and specia...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C33/04C21D8/02
CPCY02P10/20
Inventor 郭艳芳朱书成许少普张立新崔冠军刘庆波雷文慧庞百鸣陈平张兵朱成杰乔华伟
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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