Q420E steel plate with low carbon equivalent and high toughness and production method of Q420E steel plate

A production method and carbon equivalent technology, applied in the field of metal materials, can solve the problems of complex production process, low impact toughness and high production cost, and achieve the effects of simple production process, good toughness and low production cost

Active Publication Date: 2014-09-03
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current production of Q420E steel plates is faced with problems such as complex production process, high production cost, high carbon equivalent, or low impact toughness.

Method used

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  • Q420E steel plate with low carbon equivalent and high toughness and production method of Q420E steel plate
  • Q420E steel plate with low carbon equivalent and high toughness and production method of Q420E steel plate
  • Q420E steel plate with low carbon equivalent and high toughness and production method of Q420E steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The thickness of the slab is 250mm, the temperature of the slab out of the furnace is 1220°C, the heating time of the slab is 290 minutes, and the chemical composition (percentage by weight) of the slab is: C0.08%, Si0.45%, Mn1.5%, P0 .02%, S0.002%, Nb0.035%, Als0.017%, Ca0.0015%, and the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 10 mm, the detailed rolling and cold removal process is shown in Table 1, and its mechanical properties are shown in Table 2.

[0049] Such as figure 1 Shown is the metallographic structure diagram of the steel plate in Example 1 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is mainly polygonal ferrite, and there are a small amount of acicular ferrite and pearlite, and the grains are fine. Since both polygonal ferrite and acicular ferrite have good plasticity and toughness, the steel plate with this structure has good toughness.

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Embodiment 2

[0055] Adopting thickness is 250mm slab, and slab furnace temperature is 1190 ℃, and slab heating time is 430 minutes, and the (weight percentage) chemical composition of slab is: C0.07%, Si0.35%, Mn1.3%, P0 .015%, S0.001%, Nb0.03%, Als0.03%, Ca0.003%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 16 mm, the detailed rolling and cold removal process is shown in Table 3, and its mechanical properties are shown in Table 4.

[0056] Such as figure 2 Shown is the metallographic structure diagram of the steel plate in Example 2 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is mainly polygonal ferrite, and there are a small amount of acicular ferrite and pearlite, and the grains are fine. Since both polygonal ferrite and acicular ferrite have good plasticity and toughness, the steel plate with this structure has good toughness.

[0057] Table 3 Rolling and cooling proce...

Embodiment 3

[0062] Adopting thickness is 250mm slab, and slab furnace temperature is 1190 ℃, and slab heating time is 430 minutes, and the (weight percentage) chemical composition of slab is: C0.06%, Si0.42%, Mn1.41%, P0 .011%, S0.002%, Nb0.025%, Als0.021%, Ca0.0023%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 12 mm, the detailed rolling and cold removal process is shown in Table 5, and its mechanical properties are shown in Table 6.

[0063] Such as image 3 Shown is the metallographic structure diagram of the steel plate in Example 3 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is mainly polygonal ferrite, and there are a small amount of acicular ferrite and pearlite, and the grains are fine. Since both polygonal ferrite and acicular ferrite have good plasticity and toughness, the steel plate with this structure has good toughness.

[0064] Table 5 Rolling and cooling pr...

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Abstract

The invention discloses a Q420E steel plate with low carbon equivalent and high toughness. The steel plate comprises the following chemical components in percentage by weight: 0.06-0.08% of C, 0.35-0.45% of Si, 1.3-1.5% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.025-0.035% of Nb, 0.0015-0.003% of Ca, 0.017-0.03% of Als and the balance of iron and impurities. The invention also discloses a production method of the Q420E steel plate with low carbon equivalent and high toughness. The Q420E steel plate disclosed by the invention is simple in preparation process, low in production cost and good in surface quality; the Q420E steel plate with low carbon equivalent, high toughness and good surface quality can be obtained by adding a trace amount of Nb on the basis of a conventional C-Mn steel by virtue of appropriate heating, controlled rolling and controlled cooling processes.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a low-carbon equivalent high-toughness Q420E steel plate and a production method thereof. Background technique [0002] Q420E low-alloy high-strength structural steel plate is widely used in the manufacture of various construction machinery and other structural parts. A large number of steel plates need to be welded together in the manufacture of construction machinery and structural parts. At the same time, construction machinery and structural parts often carry dynamic loads and are used in low temperature environments. In order to improve work efficiency and ensure welding quality, the welding performance of the material is required to be good, and the welding performance is closely related to the carbon equivalent of the material. The lower the carbon equivalent, the better the welding performance. Therefore, downstream enterprises hope that the carbon equivalent of the materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/02
Inventor 温利军薛越张大治李浩刘海涛徐建东
Owner INNER MONGOLIA BAOTOU STEEL UNION
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