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A kind of longitudinal variable thickness high-strength ship plate and production method

A longitudinally variable thickness, high-strength technology, applied in manufacturing tools, metal rolling, workpiece cooling devices, etc., can solve the problems of poor uniformity of mechanical properties of steel plates, high production costs, and high alloying elements, and achieve excellent mechanical properties and uniform mechanical properties. good effect

Active Publication Date: 2022-07-22
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) High alloying elements and high production costs
[0006] 2) The uniformity of the mechanical properties of the steel plate along the length direction is poor
[0007] 3) The production process is complex

Method used

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  • A kind of longitudinal variable thickness high-strength ship plate and production method
  • A kind of longitudinal variable thickness high-strength ship plate and production method
  • A kind of longitudinal variable thickness high-strength ship plate and production method

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Embodiment Construction

[0034] The following examples are only some optimal embodiments of the present invention, and do not limit the scope and technical means of the foregoing invention.

[0035] Smelting is carried out according to the designed chemical composition range of the present invention, the chemical composition is shown in Table 1, and the smelting process is shown in Table 2.

[0036] The smelting process and chemical composition (wt%) of table 1 embodiment steel of the present invention

[0037]

[0038]

[0039]Table 2 embodiment steel smelting process

[0040] Numbering Nitrogen blowing treatment time / min Superheat / ℃ 1 15 22 2 18 26 3 24 21 4 28 27 5 34 29 6 32 28

[0041] The obtained continuous casting slab is heated, rolled and other processes to obtain the longitudinally variable thickness steel plate of the present invention. The heating process is shown in Table 3, and the rolling process is shown in Table 4.

[004...

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Abstract

The invention discloses a longitudinally variable thickness high-strength ship plate and a production method. The chemical composition of the steel plate is: C: 0.140%-0.180%, Si: 0.20%-0.40%, Mn: 1.00%-1.40%, V: 0.030%-0.070 %, Ti: 0.003%-0.018%, N: 0.0100%-0.0150%, P≤0.010%, S≤0.005%, Als: 0.015%-0.030%. The molten steel is nitrogen blown in a converter or RH, and the slab is heated to 1100-1250°C and kept for 0.5-5.0h; the rolling temperature is 1050-1130°C, and the thickness of the slab is rolled to 2.0-3.0 times the maximum thickness of the final LP steel plate; The intermediate billet is rolled at a temperature of 880-920°C, and the rolling thickness is 1.5-2.0 times the maximum thickness of the final LP steel plate; variable-thickness rolling is adopted, and the final rolling temperature of the steel plate is controlled to 800-850°C; the steel plate is air-cooled to room temperature to obtain the final LP steel plate. The steel plate of the invention has good uniformity of mechanical properties along the length direction, the strength difference between thick and thin positions is within 15MPa, the toughness and plasticity are consistent, and it is suitable for longitudinally variable thickness high-strength ship plates of any shape.

Description

technical field [0001] The invention belongs to the technical field of metal material production, and particularly relates to a longitudinally variable thickness high-strength ship plate and a production method thereof. Background technique [0002] Longitudinal variable thickness (LP) steel plate is a steel plate with thickness variation along the length direction. During the rolling process, the longitudinal thickness is changed by continuously changing the opening of the rolls. According to the different thickness changes, it can be divided into 10 different shapes. . Since the thickness of LP steel plate can be changed according to the load, it has unique advantages in optimizing the design of structural sections such as hulls. In recent years, with the increasing demand for lighter ships, the amount of LP steel plate is increasing. Therefore, LP steel plate is a kind of reduction and saving steel plate, which is favored by domestic and foreign manufacturers and users....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/06B21B1/46B21B1/22B21B45/02
CPCC22C38/02C22C38/04C22C38/12C22C38/14C22C38/001C22C38/06B21B1/46B21B1/22B21B45/0203
Inventor 李广龙李靖年严玲李文斌张鹏韩鹏王刚王晓航陈华罗志华
Owner ANGANG STEEL CO LTD
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