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420MPa normalizing super-thick steel plate, and preparation method thereof

A structural steel plate and normalizing technology, applied in the field of 420MPa normalized extra-thick structural steel plate and its manufacturing, to achieve the effect of large thickness, low temperature toughness, high plasticity, mechanical properties and uniform structure

Active Publication Date: 2014-01-29
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Publication No. CN102061373A invention patent discloses a heat treatment process for improving the mechanical properties of high-strength extra-thick plates. Can meet the impact requirements of -20 degrees

Method used

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  • 420MPa normalizing super-thick steel plate, and preparation method thereof
  • 420MPa normalizing super-thick steel plate, and preparation method thereof
  • 420MPa normalizing super-thick steel plate, and preparation method thereof

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Embodiment 1

[0026] According to the composition design and production process provided by the present invention, an example of a 100mm thick steel plate is provided. In addition to what has been explained in this manual, the continuous casting slab size is 400mm×2050mm×2750mm, the finished steel plate size is 100mm×2300mm×L (length), cold-packed, the heating temperature is 1170°C, and the two-stand two-stage controlled rolling is adopted in this embodiment. , the finish rolling start temperature is 875°C, the final rolling temperature is 820°C, the thickness to be warmed is 120mm, the stack cooling is 72 hours after rolling, the normalizing temperature is 880°C, the furnace time is 150min, and the accelerated cooling temperature after the furnace is 620°C. The chemical composition of the steel plate is shown in Table 1, the mechanical properties are shown in Table 2, and the metallographic structure is shown in the appendix figure 1 and figure 2 .

[0027] Chemical composition of table...

Embodiment 2

[0032] According to the composition design and production process provided by the present invention, an example of a thickness specification of 120mm is provided. In addition to what has been explained in this manual, the continuous casting slab size is 400mm×1850mm×2750mm, the finished steel plate size is 120mm×2000mm×L (length), cold loading, heating temperature 1190°C, two-stand two-stage controlled rolling , the finish rolling start temperature is 860°C, the finish rolling temperature is 820°C, the thickness to be warmed is 140mm, the stack cooling is 72 hours after rolling, the normalizing temperature is 910°C, the furnace time is 150min, and the accelerated cooling temperature after the furnace is 630°C. The chemical composition of the steel plate is shown in Table 3, the mechanical properties are shown in Table 4, and the metallographic structure is shown in the attached image 3 and Figure 4 .

[0033] Table 3 Chemical composition of 120mm steel plate (weight, %)

...

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Abstract

The invention discloses a 420MPa normalizing super-thick steel plate, and a preparation method thereof. The 420MPa normalizing super-thick steel plate comprises following chemical components, by mass, 0.14 to 0.16% of C, 0.30 to 0.40% of Si, 1.0 to 1.60% of Mn, 0.015 to 0.025% of Als, 0.005 to 0.025% of Nb, 0.065 to 0.10% of V, 0.010 to 0.02% of Ti, 0.2 to 0.45% of Ni, 0.05 to 0.30% of Cu, P less than 0.01% , S less than 0.005%, and the balance Fe and unavoidable impurities. The preparation method comprises following steps: continuous casting steel slab, which contains the above chemical components and possesses a thickness of 400mm, is subjected to two stages of rolling without water cooling, is discharged rapidly, and is subjected to stacking slow-cooling for 72h or more; and after steel plate shot blasting, the steel plate is obtained by normalizing plus accelerated cooling heat treatment process. The normalizing 100-120mm steel plate prepared by the preparation method possesses excellent strength and toughness; yield strength is more than 420MPa; and the normalizing 100 -120mm steel plate can be used for preparation of key force support elements of buildings, bridges and tower structures with large span frameworks.

Description

technical field [0001] The present invention relates to a 420MPa level normalized steel plate for extra thick specification structure and its manufacturing method, in particular to a normalized steel plate for normalized welded structure with a yield strength of 420MPa and a thickness specification between 100-120mm and its manufacturing method. Manufacturing method. Background technique [0002] With the development of social economy, more and more long-span frame buildings, bridges, and tower structures are being built. The key stress-bearing members or positions of these structures often use 420MPa-level extra-thick steel plates. The design is convenient for these steel plates. The key stress-bearing members or positions of the structure replace the use of thicker low-strength steel plates to reduce the self-weight of the structure. Steel plates with a thickness greater than 100mm are especially required to be delivered in a normalized state to ensure stable and good per...

Claims

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Application Information

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IPC IPC(8): C22C38/16C21D8/02
Inventor 王彦锋李春智刘美艳狄国标郑会平李战军杨永达王根矶刘金刚隋鹤龙姜中行
Owner SHOUGANG CORPORATION
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