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Cu-containing crack arrest steel and preparation method thereof

A technology of crack arrest and mass percentage, which is applied in the field of preparation of high-strength and high-toughness crack arrest steel for ships, and can solve the problems of low strength and no performance improvement of crack arrest steel

Active Publication Date: 2016-09-28
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] China has also carried out research and development on high-strength and high-toughness crack arrest steel for ships, such as: patent application number 201410469546.1; 201210408198.8 and other patent documents introduce the method of preparing extra-thick steel plates for container ships through controlled casting and rolling processes, but their strength is relatively Low, and the performance of crack arrest steel has not been improved by heat treatment
Relevant researches at home and abroad have not prepared crack arrest steel by generating copper-rich nanophases and using heat treatment to regulate copper-rich nanophases.

Method used

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  • Cu-containing crack arrest steel and preparation method thereof
  • Cu-containing crack arrest steel and preparation method thereof
  • Cu-containing crack arrest steel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0044] This example is a high-strength and high-toughness copper-containing crack arresting steel plate and its preparation method. The chemical composition is: C: 0.05%, Mn: 1.4%, Si: 0.14%, S: 0.003%, P: 0.004 %, Al: 0.034%, Cr: 0.18%, Ni: 0.75%, Cu: 0.38%, Nb: 0.024%, Ti: 0.012%, and the rest are Fe and unavoidable impurities. The rough rolling temperature is 1050°C, rolling 3 passes, with an average reduction of 18% each time, and a total reduction of 45%. The finish rolling start temperature is 900°C, the finish rolling temperature is 907°C, after rolling, it is watered and cooled to room temperature, and rolled for 5 passes, with an average reduction of 27% each time and a total reduction rate of 80%, to obtain a 12mm thick steel sheet. Crack plate. Does not undergo solidification, aging treatment and quenching partition treatment. Metallographic photos see figure 2 , the mechanical properties of the material see Figure 6 Table 1.

Embodiment 2

[0046] This example is a high-strength and high-toughness copper-containing crack arresting steel plate and its preparation method. The chemical composition is: C: 0.05%, Mn: 1.4%, Si: 0.14%, S: 0.003%, P: 0.004 %, Al: 0.034%, Cr: 0.18%, Ni: 0.75%, Cu: 0.38%, Nb: 0.024%, Ti: 0.012%, and the rest are Fe and unavoidable impurities. The rough rolling temperature is 1050°C, rolling 3 passes, with an average reduction of 18% each time, and a total reduction of 45%. The finish rolling start temperature is 900°C, the finish rolling temperature is 907°C, after rolling, it is watered and cooled to room temperature, and rolled for 5 passes, with an average reduction of 27% each time and a total reduction rate of 80%, to obtain a 12mm thick steel sheet. Crack plate. Solution treatment was carried out at 875°C, and the holding time was 1h. No aging treatment. Metallographic photos see image 3 , the mechanical properties of the material see Figure 6 Table 1.

Embodiment 3

[0048] This example is a high-strength and high-toughness copper-containing crack arresting steel plate and its preparation method. The chemical composition is: C: 0.05%, Mn: 1.4%, Si: 0.14%, S: 0.003%, P: 0.004 %, Al: 0.034%, Cr: 0.18%, Ni: 0.75%, Cu: 0.38%, Nb: 0.024%, Ti: 0.012%, and the rest are Fe and unavoidable impurities. The rough rolling temperature is 1050°C, rolling 3 passes, with an average reduction of 18% each time, and a total reduction of 45%. The finish rolling start temperature is 900°C, the finish rolling temperature is 907°C, after rolling, it is watered and cooled to room temperature, and rolled for 5 passes, with an average reduction of 27% each time and a total reduction rate of 80%, to obtain a 12mm thick steel sheet. Crack plate. Solution treatment was carried out at 925°C, and the holding time was 10h. No aging treatment. Metallographic photos see Figure 4 , the mechanical properties of the material see Figure 6 Table 1.

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Abstract

The invention provides Cu-containing crack arrest steel and a preparation method thereof. The components of the Cu-containing crack arrest steel include 0.02-0.10% of C, 0.1-1% of Cu, 0.1-0.4% of Si, 0.5-1.2% of Mn, 0-0.2% of Al, 0.1-0.3% of Cr, 0.5-1.5% of Ni, 0-0.8% of Mo, 0.01-0.05% of Nb, 0.03-0.2% of Ti, 0-0.005% of S, 0-0.01% of P and the balance Fe and unavoidable impurity elements. The preparation method of the Cu-containing crack arrest steel includes the steps of smelting and hot rolling in which the rough rolling temperature is 1000-1100 DEG C, and the finishing rolling starting temperature is 800-1000 DEG C. A copper-rich nanophase is generated by designing a proper micro alloy content proportion, the phase composition in the steel and the shape thereof, especially separating-out of the copper-rich nanophase are controlled through the rolling and heat treatment technology, and therefore the strength, rigidity and crack arrest performance of the Cu-containing crack arrest steel are improved.

Description

technical field [0001] The invention relates to a high-strength and high-toughness crack arresting steel for ships, and also relates to a preparation method for a high-strength and high-toughness crack arresting steel for ships. Background technique [0002] With the development of ocean trade, container ships are rapidly becoming larger, and the thickness of structural steel plates in their important parts has increased. Thick plates with a thickness of 60-80 mm have been used as high-strength component materials in hatch coamings and upper decks. However, the increase in plate thickness brings the risk that the steel plate cannot be cracked and the cracks penetrate the hull, causing the hull to break and cause a major disaster. In this regard, the International Association of Classification Societies formulated a new policy in 2013 and issued IACS UR S33 "Requirements for Use of Extremely Thick Steel Plates". The performance indicators of the crack arrest steel used in i...

Claims

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Application Information

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IPC IPC(8): C22C38/08C22C38/04C22C38/16C22C38/12C22C38/02C22C38/18C22C38/14C22C38/06C21D8/02
CPCC21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 张中武陈丹崔烨张建张静
Owner HARBIN ENG UNIV
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