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A kind of high-strength extra-thick steel plate and production method thereof

A technology of extra-thick steel plate and production method, applied in the field of metallurgy, can solve the problems of high alloy content, large structure stress, difficult to guarantee plate shape, etc., and achieve the effect of simple rolling process, uniform structure and performance, and fast rolling rhythm

Active Publication Date: 2017-08-25
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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Problems solved by technology

However, for large-thickness steel plates, there are also problems such as poor plate shape and uneven structure and properties in the thickness direction.
[0004] At present, there are many patents for the manufacture of high-strength extra-thick steel plates. From the perspective of composition, patents CN101463449A, CN102080190A, etc., in order to obtain high strength, they all use a medium-carbon composition system. Excessive carbon content is not good for the welding performance of steel plates. From the perspective of technology, the existing high-strength extra-thick steel plate patents basically use off-line / on-line quenching + tempering heat treatment process to obtain high strength, such as patent CN101633996A, etc., the quenching process is limited by the thickness of the steel plate, the steel plate The thicker it is, the hardened core cannot be hardened, and there is a thickness effect on the performance of the steel plate. At the same time, for high-strength extra-thick steel plates, the alloy content is high, and cracking is easy to occur after quenching; from the perspective of the strengthening mechanism, the existing patents are obtained through Martens Solid phase transformation strengthening to achieve high strength, such as patent CN102226255A, etc., while the martensitic transformation is accompanied by volume expansion, there will be a large structural stress in the steel plate
[0005] Therefore, there are the following problems in the existing production technology of extra-thick plates: 1) The steel plate is produced by on-line / off-line quenching / controlled cooling process. Uniform, the structure and properties of the core and the surface are quite different; 2) Due to the high alloy of the steel plate, the internal stress of the steel plate after water cooling is relatively large, easy to crack, and the shape of the plate is difficult to guarantee; 3) In the production of extra-thick plates, in order to ensure Hardenability of steel plate, high carbon content, unfavorable for welding

Method used

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  • A kind of high-strength extra-thick steel plate and production method thereof
  • A kind of high-strength extra-thick steel plate and production method thereof
  • A kind of high-strength extra-thick steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The steel consists of the following components (wt%): C: 0.010%, Si: 0.20%, Mn: 0.90%, Ni: 3.90%, Cu: 1.20%, Ti: 0.025%, Al: 1.20%, and the rest is Fe and unavoidable impurities.

[0034] (1) In the smelting and casting process, smelting and casting into steel ingots according to the above-mentioned chemical composition weight percentage;

[0035] (2) In the heating process, the heating temperature of the steel ingot is 1160-1240°C;

[0036] (3) In the rolling process, the starting rolling temperature is ≤1120°C, the finishing rolling temperature is ≥940°C, air-cooled to room temperature after rolling, and the thickness of the steel plate is 135mm.

[0037] (4) In the heat treatment process, the normalizing + tempering process is adopted, the normalizing temperature is 860-920°C, and the holding time is 2-4h; after that, tempering is carried out, the tempering temperature is 500°C, and the holding time is 4-10h . The mechanical properties of the obtained steel plates...

Embodiment 2

[0039]The steel consists of the following components (wt%): C: 0.015%, Si: 0.25%, Mn: 1.00%, Ni: 3.00%, Cu: 1.00%, Ti: 0.015%, Al: 1.00%, and the rest is Fe and unavoidable impurities.

[0040] (1) In the smelting and casting process, smelting and casting into steel ingots according to the above-mentioned chemical composition weight percentage;

[0041] (2) In the heating process, the heating temperature of the steel ingot is 1160-1240°C;

[0042] (3) In the rolling process, the starting rolling temperature is ≤1120°C, the finishing rolling temperature is ≥940°C, air-cooled to room temperature after rolling, and the thickness of the steel plate is 135mm.

[0043] (4) In the heat treatment process, the normalizing + tempering process is adopted, the normalizing temperature is 860-920°C, and the holding time is 2-4h; after that, tempering is carried out, the tempering temperature is 510°C, and the holding time is 4-10h . The mechanical properties of the obtained steel plates ...

Embodiment 3

[0045] The steel is composed of the following components (wt%): C: 0.020%, Si: 0.30%, Mn: 1.10%, Ni: 2.70%, Cu: 0.90%, Ti: 0.010%, Al: 0.90%, and the rest is Fe and unavoidable impurities.

[0046] (1) In the smelting and casting process, smelting and casting into steel ingots according to the above-mentioned chemical composition weight percentage;

[0047] (2) In the heating process, the heating temperature of the steel ingot is 1160-1240°C;

[0048] (3) In the rolling process, the starting rolling temperature is ≤1120°C, the finishing rolling temperature is ≥940°C, air-cooled to room temperature after rolling, and the thickness of the steel plate is 135mm.

[0049] (4) In the heat treatment process, the normalizing + tempering process is adopted, the normalizing temperature is 860-920°C, and the holding time is 2-4h; after that, tempering is carried out, the tempering temperature is 525°C, and the holding time is 4-10h . The mechanical properties of the obtained steel pla...

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Abstract

The invention relates to a high-strength extra-thick steel plate and a production method thereof. The chemical composition of the steel plate includes: C 0.0025-0.025%, Si 0.16-0.36%, Mn 0.85-1.15%, Ni 2.1-4.5%, Cu 0.8-1.2%, Ti 0.008-0.035%, Al 0.8-1.2%, and the rest are Fe and unavoidable impurities. The invention adopts ultra-low carbon components, rationally configures Ni, Cu, Al and Ti alloy content, supplemented by normalizing + tempering process, so that it can fully form three kinds of intermetallic intermetallics of Ni3Al, Ni3Cu and Ni3Ti in the tempering process. compound and Cu-rich phase. The steel plate prepared by using this composition and process has a thickness of ≥100mm, yield strength Rp0.2≥900MPa, tensile strength Rm≥1000MPa, elongation after fracture ≥12%, good welding performance, cold bending performance and plate shape, and good thickness direction. Uniform tissue performance, no plate thickness effect. The steel plate produced by the invention can be widely used in various application fields of heavy-duty construction machinery, large-scale building structures, bridge structures and other large-thickness steel plates.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a high-strength extra-thick steel plate and a production method thereof, in particular to a multi-phase nano-precipitation composite strengthened ultra-low carbon high-strength extra-thick steel plate and a production method thereof. Background technique [0002] High-strength steel is one of the important engineering structural materials, widely used in various construction machinery, mining machinery, bridge structures, building structures and other fields. With the vigorous rise of infrastructure such as high-rise buildings, cross-sea bridges, deep-sea oil production platforms, and large-scale hydropower stations, steel structures are constantly developing towards large-scale and heavy-duty. The larger the steel plate is, the steel plate with ordinary strength level and thickness level can no longer meet the construction needs of steel structure, and the market demand for high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C21D8/02
Inventor 镇凡曲锦波张宽
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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