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Manufacturing method of high-strength, toughness and layered tear-resistant steel plate with a thickness of 50-80 mm

A technology of anti-lamellar tearing and manufacturing method, which is applied in the field of plate rolling and post-rolling cooling process in the metallurgical industry, can solve problems such as uneven rolling deformation, poor anti-lamellar tearing performance, and uneven cooling, and achieve Fine grain and structure, good resistance to lamellar tearing, and the effect of reducing core defects

Active Publication Date: 2017-01-04
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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  • Manufacturing method of high-strength, toughness and layered tear-resistant steel plate with a thickness of 50-80 mm
  • Manufacturing method of high-strength, toughness and layered tear-resistant steel plate with a thickness of 50-80 mm
  • Manufacturing method of high-strength, toughness and layered tear-resistant steel plate with a thickness of 50-80 mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A high-strength, toughness-resistant lamellar tearing steel of this embodiment is composed of the following weight percentages: 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%, S0.002%, 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 high-strength, toughness-resistant lamellar tearing steel of this embodiment is composed of the following weight percentages: 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%, S0.002%, the rest is iron Fe and unavoidable impurities, and the grain size is 11. 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 high-strength, toughness-resistant layered tearing steel of this embodiment is composed of the following weight percentages: 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%, S0.002%, the rest is iron Fe and unavoidable impurities, 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 method for manufacturing a high-strength, toughness and layered tear-resistant steel plate with a thickness of 50-80 mm. The continuous casting slab with the same composition as the steel plate is heated to 1210-1250° C., and the heating time is controlled at 1.1-1.2 min / mm. The casting slab temperature is ≥1150°C, the starting rolling temperature in the recrystallization zone is ≥1050°C, rolling 6-7 passes, the intermediate slab is waiting for temperature, the starting rolling temperature in the non-recrystallization zone is controlled at 800-830°C, and the final rolling temperature is controlled at 800~830℃, rolling 8~9 passes, after rolling, the steel plate is cooled by laminar flow in the strong cooling zone and the intermediate cooling zone at the cooling rate of 6.5~13℃ / S and 2.0~6.0℃ / S respectively, ACC system The roll speed is 0.6~0.8m / s, and the grain size of the steel plate produced is 10.5~12 grades; the comprehensive properties of the steel plate are: yield strength ≥ 420MPa, ‑40°C longitudinal impact energy ≥ 200J, Z-direction performance sectional reduction rate ≥ 65%. The present invention obtains high-strength steel plates by precisely controlling rolling, and then reasonably opens the water groups in the strong cooling zone and the intermediate cooling zone to control the cooling rate, effectively refine the grain and structure of the steel, and reduce 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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Patent Type & Authority Patents(China)
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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