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Making method of high strength and toughness lamellar tearing-resistant steel plate with thickness of 50-80mm

A technology of anti-lamellar tearing and manufacturing method, which is applied in the field of sheet rolling and post-rolling cooling process in metallurgical industry, can solve the problems of uneven rolling deformation, poor anti-lamellar tearing performance, and uneven cooling, etc. Refinement of grain and structure, good resistance to lamellar tearing, and reduction of heart defects

Active Publication Date: 2015-03-11
XINYU IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for high-strength steel plates with a thickness of more than 50mm as described in the present invention, TMCP temperature-controlled rolling is relatively seldom used at present. Larger width, it is easy to produce some defects, such as continuous casting slab composition segregation, uneven rolling deformation, uneven cooling, especially in the thickness direction, it is more difficult to control the uniformity of the structure, which causes the performance difference between the surface and core of the steel plate Large, unsatisfactory match between strength and toughness, and poor lamellar tear resistance, resulting in large fluctuations in product quality and low yield, which have a negative impact on the economic benefits of enterprises

Method used

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  • Making method of high strength and toughness lamellar tearing-resistant steel plate with thickness of 50-80mm
  • Making method of high strength and toughness lamellar tearing-resistant steel plate with thickness of 50-80mm
  • Making method of high strength and toughness lamellar tearing-resistant steel plate with thickness of 50-80mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of high-strength toughness anti-lamellar tearing steel of the present embodiment is made up of following percentage by weight: C 0.12%, Mn 1.43%, Si 0.15%, Als 0.023%, Ni 0.21%, Nb 0.03%, Ti 0.013%, Cu 0.15%, P 0.011%, S 0.002%, the rest is iron Fe and unavoidable impurities, and the grain size is 10.5. The thickness of the steel plate is 50mm.

[0026] The billet size is 300mm×1870mm×2400mm, the billet is heated to 1250°C, and the heating time is controlled at 1.1min / mm.

[0027] The parameters of recrystallization rolling (rough rolling) are shown in Table 1.

[0028] Table 1.

[0029] .

[0030] The parameters of non-recrystallized rolling (finish rolling) are shown in Table 2.

[0031] Table 2.

[0032] .

[0033] The process parameters of the ACC cooling system are shown in Table 3.

[0034] table 3.

[0035] .

Embodiment 2

[0037] A kind of high-strength toughness anti-lamellar tearing steel of the present embodiment is made up of following percentage by weight: C 0.12%, Mn 1.43%, Si 0.15%, Als 0.023%, Ni 0.21%, Nb 0.03%, Ti 0.013%, Cu 0.15%, P 0.011%, S 0.002%, the rest is iron Fe and unavoidable impurities, and the grain size is 11 grades. The thickness of the steel plate is 60mm.

[0038] The billet size is 300mm×1870mm×2400mm, the billet is heated to 1230°C, and the heating time is controlled at 1.2min / mm.

[0039] The rough rolling parameters are shown in Table 4.

[0040] Table 4.

[0041] .

[0042] The finishing rolling parameters are shown in Table 5.

[0043] table 5.

[0044] .

[0045] The process parameters of ACC cooling system are shown in Table 6.

[0046] Table 6.

[0047] .

Embodiment 3

[0049] A kind of high-strength toughness anti-lamellar tearing steel of the present embodiment is made up of following percentage by weight: C 0.09%, Mn 1.45%, Si 0.15%, Als 0.039%, Ni 0.21%, Nb 0.03%, Ti 0.011%, Cu 0.17%, P 0.012%, S 0.002%, the rest is iron Fe and unavoidable impurities, and the grain size is 12 grades. The thickness of the steel plate is 70mm.

[0050] The billet size is 360mm×1870mm×5300mm, the billet is heated to 1240°C, and the heating time is controlled at 1.2min / mm.

[0051] The rough rolling parameters are shown in Table 7.

[0052] Table 7.

[0053] .

[0054] The finishing rolling parameters are shown in Table 8.

[0055] Table 8.

[0056] .

[0057] The process parameters of the ACC cooling system are shown in Table 9.

[0058] Table 9.

[0059] .

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Abstract

The invention discloses a making method of a high strength and toughness lamellar tearing-resistant steel plate with the thickness of 50-80mm. The method comprises the following steps: heating a continuously cast blank having same components with the steel plate to 1210-1250DEG C, controlling the heating time according to 1.1-1.2min / mm, setting the casting temperature of the cast blank not lower than 1150DEG C and the rolling temperature of a recrystalization region not lower than 1050DEG C, rolling 6-7 passes, carrying out holding delay, controlling the rolling temperature of an un-recrystalized region in a range of 800-830DEG and the finishing temperature in a range of 800-830DEG C, rolling 6-7 passes, carrying out laminar cooling on the rolled steel plate according to a strong cooling region cooling speed of 6.5-13DEG C / S and a medium cooling region cooling speed of 2.0-6.0DEG C / S, and controlling the roll speed of an ACC system in a range of 0.6-0.8m / s to make the steel plate with the grain size of 10.5-12 grades. The yield strength, the longitudinal impact energy at -40DEG C and the Z-direction performance section shrinkage of the steel plate are not lower than 420MPa, not lower than 200J and not lower than 65% respectively. The high strength steel plate is obtained through accurate controlled rolling, and the cooling speed is controlled by reasonably starting the strong cooling region and medium cooling region water group in order to effectively refine the crystal grins and structure of the steel and reduce the core defects.

Description

technical field [0001] The invention relates to the technical field of plate rolling and cooling after rolling in the metallurgical industry, in particular to a method for manufacturing a high-strength, toughness and layered tearing-resistant steel plate with a thickness of 50-80 mm. Background technique [0002] With the rapid development of international trade and the development of offshore oil and gas resources, the shipbuilding industry and marine engineering require high-strength, high-strength, high-strength, lamellar tear resistance (also called thickness direction performance or Z-direction performance) steel plates with a thickness of more than 50mm. Also getting bigger and bigger. The marine environment is harsh. In addition to bearing gravity loads, ships and offshore platforms must also consider the influence of wind loads, wave loads, ocean current loads, ice loads, etc., and high-strength steel plates with a thickness of more than 50mm are used in important pa...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/16
Inventor 赵和明熊文名陈英俊王洪冯小明熊雄王国文周焱民杨帆刘志芳黄珍傅清霞闫博
Owner XINYU IRON & STEEL CO LTD
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