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Thick steel plate with excellent brittlement crevasse crack propagation halt characteristic and manufacturing method thereof

A technology of thick steel plates and steel plates, applied to the field of thick steel plates with special characteristics, and the field of manufacturing such thick steel plates, can solve the problems that it is difficult to apply high-strength thick steel plates, and achieve the effect of excellent brittle crack propagation stop characteristics

Inactive Publication Date: 2009-12-23
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these technologies, it is difficult to apply high-strength thick steel plates because soft ferrite is used as the parent phase.

Method used

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  • Thick steel plate with excellent brittlement crevasse crack propagation halt characteristic and manufacturing method thereof
  • Thick steel plate with excellent brittlement crevasse crack propagation halt characteristic and manufacturing method thereof
  • Thick steel plate with excellent brittlement crevasse crack propagation halt characteristic and manufacturing method thereof

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Embodiment Construction

[0014] The inventors of the present invention focused on a thick steel plate with a bainite structure, and studied from various angles a method for making the brittle crack propagation stop property of the steel plate favorable. As a result, it was found that in the bainite structure, the austenite structure is formed regardless of the orientation relationship with respect to the austenite structure, but if the chemical composition of the steel plate, the formation temperature of the structure, and the orientation relationship of each lattice selected based on other conditions, etc. Change, at a predetermined position in the thickness direction of the steel plate, the crystal grains having a characteristic crystal orientation are made finer, and the brittle crack propagation stop characteristic is improved, and the present invention has been completed.

[0015] The steel plate of the present invention is composed of a structure mainly composed of bainite (bainite phase accounts...

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Abstract

The steel plate of the invention contains a C-grade chemical component and the balance of iron and unavoidable foreign substances, is formed by a structure of more than 95% of bainite by area on a prescribed position in the plate thickness direction. On a position from the surface by a depth of t / 8-t / 4 (t represents the plate thickness), an average diameter of granular equivalent circles is less than 8[Mu]m when a region enclosed by a greater horn grain boundary of two neighboring crystals with a more than 15 DEG azimuth error is used as a grain. By means of implementing the minuteness of the grain diameter, it is capable of obtaining the thick steel plate with an excellent brittlement crevasse crack propagation halt characteristic.

Description

technical field [0001] The present invention relates to a thick steel plate mainly used as a raw material for structural materials of ships and bridges, and in particular to a thick steel plate with improved properties of stopping the propagation of brittle cracks that have occurred, and a useful method for manufacturing such a thick steel plate Methods. Background technique [0002] In steel plates used in structures such as ships, buildings, storage tanks, marine structures, pipeline steel pipes, etc., in order to suppress brittle failure of structures, arrest characteristics (hereinafter referred to as "brittle cracks") are required. Propagation Stop Property"), which is the ability to suppress damage due to the propagation of brittle cracks. In recent years, along with the enlargement of structures, high-strength thick steel plates with a yield stress of 390 MPa or more and a plate thickness of 50 mm or more are frequently used. However, the brittle crack propagation s...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
CPCC21D8/0226C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 山口彻雄田村荣一
Owner KOBE STEEL LTD
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