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Non-broadening low-temperature-toughness ship plate marine steel and manufacturing method thereof

A low-temperature toughness and broadening technology, applied in temperature control and other directions, can solve problems such as limited production of steel plates, pauses in the rolling process, and restrictions on the length of steel billets, so as to ensure the performance of steel plates, refine the original grains, and improve uniformity Effect

Inactive Publication Date: 2021-01-29
SD STEEL RIZHAO CO LTD
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Problems solved by technology

However, this production mode also has certain disadvantages. For example, during the widening process, the steel billet needs to be rotated 90° forward and backward on the roller table, causing the rolling process to stop and reduce the production rhythm; The single weight of steel plate that can be produced is limited

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  • Non-broadening low-temperature-toughness ship plate marine steel and manufacturing method thereof
  • Non-broadening low-temperature-toughness ship plate marine steel and manufacturing method thereof
  • Non-broadening low-temperature-toughness ship plate marine steel and manufacturing method thereof

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Embodiment Construction

[0046] The specific implementation of the present invention will be further described below in conjunction with the examples, and the present invention is not limited to the scope of the examples.

[0047] A low-temperature ductile marine steel without broadening, the mass fraction of its chemical composition is: C 0.15-0.18%, Si 0.10-0.30%, Mn 1.15-1.45%, P≤0.015%, S≤0.005%, Als 0.008-0.020%, Nb 0.008-0.025%, Ti 0.008-0.014%, Ceq≤0.43%. The rest is Fe and unavoidable impurities.

[0048] The thickness range of the marine engineering steel plate of the ship plate is 4-50mm. Transverse yield strength is 380-420MPa, longitudinal yield strength is 375-415MPa, transverse tensile strength is 515-555MPa, longitudinal tensile strength is 510-550MPa, transverse impact energy at -60°C is 180-250J, longitudinal impact energy at -60°C is 210-270J, The performance ratio of horizontal and vertical steel plates is 0.93 to 1.02.

[0049] A method for manufacturing low-temperature ductile ...

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Abstract

The invention discloses non-broadening low-temperature-toughness ship plate marine steel and a manufacturing method thereof. The non-broadening low-temperature-toughness ship plate marine steel comprises the following chemical components in percentage by mass: 0.15-0.18% of C, 0.10-0.30% of Si, 1.15-1.45% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.008-0.020% ofAls, 0.008-0.025% of Nb, 0.008-0.014% of Ti, less than or equal to 0.43% of Ceq, and the balance of Fe and inevitable impurities. According to the non-broadening low-temperature-toughness ship plate marine steel and the manufacturing method thereof, a non-broadening rolling mode is utilized, so that the production efficiency of a steel plate can be greatly improved on the premise of effectively guaranteeing the performance of the steel plate; and meanwhile, the production limitation of a large-unit-weight order is broken through, the producible specification is expanded, and considerable benefits are created for enterprises.

Description

technical field [0001] The invention relates to a low-temperature tough ship plate marine steel without widening and a manufacturing method thereof. Background technique [0002] As we all know, in the production process of medium and heavy plates, in order to ensure that the difference between the transverse and longitudinal properties of the steel plate is controlled within a reasonable range, it is necessary to increase the number of widening passes in the rough rolling stage, which not only meets the requirements for the width of the finished product specification, but also promotes the transverse deformation of the steel plate through the transverse deformation of the steel plate. The structure is refined, reducing the degree of anisotropy in the horizontal and vertical directions in terms of structure and performance, and improving the uniformity of the performance of the steel plate. However, this production mode also has certain disadvantages. For example, during the...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/04B22D11/112B21B37/74
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/04B22D11/112B21B37/74
Inventor 杨建勋王润港郑飞徐庆磊李国宝胡淑娥王淑华高龙永王振华李灿明蔡茗宇薛燕刘熙章
Owner SD STEEL RIZHAO CO LTD
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