Low compression ratio 690MPa grade extra thick steel plate and production method thereof

A technology of extra-thick steel plate and low compression ratio, which is applied in the field of high-strength quenched and tempered steel plate, which can solve the problems of restricting the popularization and application of extra-thick ultra-high-strength steel plate and high cost, so as to shorten the cooling time, improve the rolling rhythm, and reduce the rough rolling pass times the effect

Inactive Publication Date: 2017-01-11
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are very few continuous casting slabs with super-large cross-sections above 300mm in China, and the cost of producing extra-thick ultra-high-strength steel plates by using large steel ingots or electroslag remelting technology is too high, which seriously restricts the popularization and application of extra-thick ultra-high-strength steel plates

Method used

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  • Low compression ratio 690MPa grade extra thick steel plate and production method thereof
  • Low compression ratio 690MPa grade extra thick steel plate and production method thereof
  • Low compression ratio 690MPa grade extra thick steel plate and production method thereof

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Embodiment Construction

[0036] The present invention is further illustrated by some examples below.

[0037] The chemical composition of each embodiment of the steel of the present invention is shown in Table 1. The thickness of the finished steel plate is 80 mm to 115 mm, and the preparation process parameters are shown in Table 2. The comprehensive mechanical properties of the inventive steel are as shown in Table 3, and the microstructure of the finished steel plate of the inventive steel embodiment 1 is as follows figure 1 , 2 shown.

[0038] Table 1 Invention Steel Chemical Composition (wt%)

[0039]

[0040] Table 2 Invention Steel Preparation Process Parameters

[0041]

[0042]

[0043] Table 3 Invention Steel Mechanical Properties

[0044]

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PUM

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Abstract

The invention discloses a low compression ratio 690MPa grade extra thick steel plate and a production method thereof, and the low compression ratio 690MPa grade extra thick steel plate comprises the following components by weight: 0.05%-0.14% of C, 0.12%-0.45% of Si, 0.70%-1.40% of Mn, < = 0.010% of P, < = 0.005% of S, 0.025%-0.065% of Als, < = 0.005% of N, 0.10%-0.50% of Cu, 0.50%-1.00% of Ni, 0.10%-0.40% of Cr, 0.10%-0.45% of Mo, also comprises one or more than two components selected from the following chemical components: 0.03%-0.08% of V, 0.005%-0.04% of Nb, 0.005%-0.03% of Ti, 0.0008-0.004% of B and 0.002%-0.006% of Ca, and also comprises balance of Fe and inevitable impurities, wherein the total ratio of precious and strengthening elements of Cr, Mo, Ni and Cu is less than or equal to 1.5%.

Description

technical field [0001] The invention belongs to the technical field of structural steel manufacturing, and relates to an ultra-high-strength quenched and tempered steel plate with a thickness of 80-115 mm and a yield strength of 690 MPa obtained by using a low compression ratio (≤3:1) technology. Background technique [0002] 690MPa ultra-high-strength and extra-thick steel plates are widely used in various fields of important national economy and equipment construction such as construction machinery, offshore platforms, boiler containers, and ships. In recent years, the development trend of large-scale engineering equipment and safe components has made the demand for ultra-high-strength extra-thick steel plates increasing. At the same time, higher requirements are put forward for the comprehensive properties of ultra-high-strength and extra-thick steel plates, such as good strength, low-temperature toughness, weldability, lamellar tear resistance, and so on. The production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/54C22C38/48C22C38/46C22C38/44C21D8/02
Inventor 严玲黄松李静韩鹏王勇周成张坤
Owner ANGANG STEEL CO LTD
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