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High-toughness and high-strength thick steel plate and production method thereof

A production method and high toughness technology, applied in the field of metallurgy, can solve the problems of difficult to achieve steel plates, poor impact toughness, unfavorable toughness, etc., and achieve the effects of small hardness fluctuation, lower yield ratio and excellent plasticity.

Active Publication Date: 2016-09-21
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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Problems solved by technology

[0004] Among the many patents introduced above, in terms of composition, the patents CN104513936A, CN104561827A, CN102181788A, CN103194684A, CN102828126A, CN103194676A etc. basically use B or B+V or B+ high Ti composition system, B is easy to segregate at the grain boundary, V , Ti is easy to form large-size precipitates, which is not good for toughness, especially under the action of ultra-high-speed impact load, it is easy to produce cracks on the precipitated hard points, resulting in fracture; Basically, off-line quenching + tempering, on-line quenching + tempering, on-line quenching, etc. are adopted. The structure is a full martensitic structure, and there is no soft phase in the structure; from the perspective of thickness specifications, the existing inventions are basically coiled plates. , a small amount is a thick plate, and its maximum thickness is only 50mm (patent CN102828126A); from the performance point of view, the yield strength of the existing invention steel plate is generally less than 1200MPa, the strength is low, and at the same time, its impact toughness is poor with the increase of strength
Therefore, it is difficult for the existing steel plate production technology to achieve ultra-high strength (yield strength ≥ 1200MPa), high toughness (-40°C impact energy ≥ 65J) and large thickness (thickness ≥ 80mm)

Method used

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  • High-toughness and high-strength thick steel plate and production method thereof

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Effect test

Embodiment 1

[0038] The steel plate is composed of the following components (wt%): C: 0.22%, Si: 0.31%, Mn: 0.62%, Cr: 1.01%, Ni: 1.99%, Mo: 0.38%, Nb: 0.014%, Ti: 0.010% , and the rest are Fe and unavoidable impurities. Mn

[0039] (1) Smelting, casting and rolling into steel plates according to the weight percentage of the above chemical composition, the thickness of the steel plate is 80mm;

[0040] (2) In the heat treatment process, the quenching temperature is A c3 +60℃~A c3 +100℃, where A c3 =910-203×C 1 / 2 -15.2×Ni+44.7×Si+104×V+31.5×Mo+13.1×W=810°C, that is, the quenching temperature is 870-910°C, which is selected as 900°C; the sub-temperature quenching temperature is A c3 -40℃~A c3 -5°C, that is, 770-805°C, 800°C is selected; the tempering temperature is 220°C. The mechanical properties of the obtained steel plate are shown in Table 1, and the microstructure photos at 1 / 4 of the longitudinal section of the steel ...

Embodiment 2

[0046] The steel plate is composed of the following components (wt%): C: 0.21%, Si: 0.29%, Mn: 0.59%, Cr: 1.17%, Ni: 2.21%, Mo: 0.40%, Nb: 0.013%, Ti: 0.011% , and the rest are Fe and unavoidable impurities. Mn

[0047] (1) Smelting, casting and rolling into steel plates according to the weight percentage of the above chemical composition, the thickness of the steel plate is 80mm;

[0048] (2) In the heat treatment process, the quenching temperature is A c3 +60℃~A c3 +100℃, where A c3 =910-203×C 1 / 2 -15.2×Ni+44.7×Si+104×V+31.5×Mo+13.1×W=808°C, that is, the quenching temperature is 868~908°C, which is selected as 900°C; the sub-temperature quenching temperature is A c3 -40℃~A c3 -5°C, that is, 760-803°C, 800°C is selected; the tempering temperature is 250°C. The mechanical properties of the obtained steel plates are listed in Table 1.

Embodiment 3

[0054] The steel plate is composed of the following components (wt%): C: 0.23%, Si: 0.27%, Mn: 0.65%, Cr: 1.11%, Ni: 1.81%, Mo: 0.30%, Nb: 0.010%, Ti: 0.009% , and the rest are Fe and unavoidable impurities. Mn

[0055] (1) Smelting, casting and rolling into steel plates according to the weight percentage of the above chemical composition, the thickness of the steel plate is 80mm;

[0056] (2) In the heat treatment process, the quenching temperature is A c3 +60℃~A c3 +100℃, where A c3 =910-203×C 1 / 2 -15.2×Ni+44.7×Si+104×V+31.5×Mo+13.1×W=808°C, that is, the quenching temperature is 868~908°C, which is selected as 900°C; the sub-temperature quenching temperature is A c3 -40℃~A c3 -5°C, that is, 760-803°C, 800°C is selected; the tempering temperature is 280°C. The mechanical properties of the obtained steel plates are listed in Table 1.

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Abstract

The invention relates to a high-toughness and high-strength thick steel plate and a production method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.20-0.24% of C, 0.25-0.36% of Si, 0.50-0.75% of Mn, 1.00-1.20% of Cr, 1.65-2.4% of Ni, 0.28-0.42% of Mo, 0.006-0.018% of Nb, 0.005-0.015% of Ti, and the balance Fe and inevitable impurities. According to the steel plate and the production method thereof, which are disclosed by the invention, an ingredient B-free system is adopted, a reasonable design is carried out on the alloy elements of Mn, Ni, Cr and Mo, the conditions that Mn+Cr is less than Ni, and Si+Mn+Cr+Ni+Mo is greater than 3.8% and less than 5% are met; and through a process of combining quenching, intercritical quenching and tempering, the produced steel plate has a thickness of not less than 80mm, a yield strength Rp0.2 of not less than 1200MPa, a tensile strength Rm of not less than 1450MPa, a percentage elongation of not less than 12% after fracture, a yield ratio of not greater than 0.85, and an impact energy of not less than 65J at minus 40 DEG C, the structure and properties in the whole thickness direction are uniform, the hardness fluctuation is low, and the fluctuation amplitude of the Brinell hardness value of the section is less than 10HB. The steel plate can be widely used in the high-strength and high-toughness super-thick steel plate application fields of various heavy engineering machinery, mining machinery, coal mine machinery, large buildings, bridges, hydroelectric power, ocean platforms and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a thick steel plate with high toughness and high strength and a production method thereof. Background technique [0002] With the large-scale of heavy equipment, high-rise building structure and long-span railway bridges in China, nuclear power, military industry, shipbuilding, marine engineering, energy, transportation, construction, machinery manufacturing and other industries have developed rapidly. The steel structure is constantly developing towards large-scale, high-strength, and lightweight. The binding force of some structural parts is getting bigger and bigger. Steel plates with ordinary strength levels, toughness levels, and thickness specifications can no longer meet the design requirements of steel structures. High-strength (≥ 690MPa), large thickness (≥80mm) steel plate demand is increasing. For example, for extra large and heavy excavators used in mi...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/14C22C38/12C22C38/08C22C38/02C22C38/04C22C33/04C21D1/18
CPCC21D1/185C22C33/04C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/18
Inventor 镇凡张宽曲锦波
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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