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A kind of thick steel plate with high strength and toughness and low yield strength ratio and its production process

A technology with low yield ratio and production process, applied in the field of iron and steel materials, can solve the problem of low toughness and plasticity, and achieve the effects of small fluctuation in performance, improved low temperature toughness, and uniform structure

Active Publication Date: 2020-10-02
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention patent with the publication number CN105950997 proposes a high-toughness and high-strength thick plate and its production method. The rolled steel plate is heat-treated by quenching + sub-temperature quenching + tempering process, so that the yield strength can be ≥ 1200MPa, and the yield strength ratio ≤0.85, and can produce steel plate thickness ≥80mm, but elongation after fracture ≥12%, impact energy at -40°C ≥65J, low toughness and plasticity

Method used

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  • A kind of thick steel plate with high strength and toughness and low yield strength ratio and its production process
  • A kind of thick steel plate with high strength and toughness and low yield strength ratio and its production process
  • A kind of thick steel plate with high strength and toughness and low yield strength ratio and its production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The chemical composition of the billet by mass percentage is: C 0.06%, Si 0.11%, Mn 1.5%, Ni 4.5%, Cr 0.6%, Mo 0.4%, V 0.1%, Nb 0.1%, Al 0.1%, the balance is Fe and unavoidable impurities.

[0040] Thick slabs of the above chemical composition were rolled into steel plates with a thickness of 25 mm.

[0041] In the heat treatment process, the primary quenching temperature is 900°C, the secondary quenching temperature in the two-phase zone is 680°C, and the tempering temperature is 550°C. The mechanical properties of the steel plate obtained are shown in Table 1, and the microstructure photo of the steel plate is shown in Table 1. figure 1 As shown, its microstructure is ferrite and tempered lath martensite.

Embodiment 2

[0043] The chemical composition of the billet by mass percentage is: C 0.06%, Si 0.11%, Mn 1.5%, Ni 4.5%, Cr 0.6%, Mo 0.4%, V 0.1%, Nb 0.1%, Al 0.1%, the balance is Fe and unavoidable impurities.

[0044] Thick slabs of the above chemical composition were rolled into steel plates with a thickness of 45 mm.

[0045] In the heat treatment process, the primary quenching temperature is 880°C, the secondary quenching temperature in the two-phase zone is 700°C, and the tempering temperature is 550°C. The mechanical properties of the steel plate obtained are shown in Table 1, and the microstructure photo of the steel plate is shown in Table 1. figure 2 As shown, its microstructure is ferrite and tempered lath martensite.

Embodiment 3

[0047] The chemical composition of the billet by mass percentage is: C 0.06%, Si 0.11%, Mn 1.5%, Ni 4.5%, Cr 0.6%, Mo 0.4%, V 0.1%, Nb 0.1%, Al 0.1%, the balance is Fe and unavoidable impurities.

[0048] Thick slabs of the above chemical composition were rolled into steel plates with a thickness of 80 mm.

[0049] In the heat treatment process, the primary quenching temperature is 860°C, the secondary quenching temperature in the two-phase zone is 720°C, and the tempering temperature is 570°C. The mechanical properties of the steel plate obtained are shown in Table 1, and the microstructure photo of the steel plate is shown in Table 1. image 3 As shown, its microstructure is ferrite and tempered lath martensite.

[0050] Table 1 Mechanical properties of high-strength toughness and low yield ratio thick steel plates involved in the embodiments of the present invention

[0051]

[0052] Note: According to the GB / T 228.1-2010 test standard, the tensile sample adopts a rod...

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Abstract

The invention provides a thick steel plate with high strength and toughness and low yield ratio and a production process thereof, and belongs to the field of steel materials. The thick plate comprisesthe following chemical components, by mass: less than or equal to 0.07% of C, less than or equal to 0.2% of Si, 1.0-2.5% of Mn, 4.0-6.0% of Ni, 0.4-1.2% of Cr, 0.2-0.8% of Mo, and 0.1-0.4% of V, Nb and Al, with the balance being Fe and unavoidable impurities. The production process is to prepare the thick steel plate having a thickness of 20-80 mm with high strength and toughness and low yield ratio by controlled rolling and controlled cooling and off-line heat treatment processes on the basis of the components. The controlled rolling and controlled cooling process adopts two-stage rolling, and a pile is cooled to room temperature after the rolling. The heat treatment adopts a two-time quenching process and obtains the thick steel plate with high strength and toughness and low yield ratioafter primary quenching, two-phase zone secondary quenching and tempering in order. The thick steel plate of the invention has the advantages of high strength, high low temperature toughness and lowyield ratio, and can be used for hull structure construction under lower temperature environment.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and in particular relates to a thick steel plate with high strength and toughness and low yield ratio and a production process thereof. Background technique [0002] High-strength and tough thick plates are widely used in marine, mining, construction, nuclear power and other fields. The performance requirements of medium and thick plates for hull structures include high strength, high toughness, low yield ratio and good weldability. Precise control and high-clean steel metallurgy technology, low-cost high-performance micro-alloying technology, TMCP technology, off-line / on-line heat treatment strengthening technology for medium and thick plates, etc. [0003] At present, TMCP technology has been widely used in the production process of low-alloy high-strength steel. - High temperature tempering, QT) production process is still irreplaceable. Quenched and tempered high-strength s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/02C22C38/04C22C38/58C22C38/44C22C38/46C22C38/48C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/58
Inventor 康永林朱国明王九清郭呈宇
Owner UNIV OF SCI & TECH BEIJING
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