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High-strength thick steel plate for high heat input welding excellent in brittle crack propagation stop characteristic and manufacturing method thereof

A technology for high-intensity welding and brittle crack propagation, applied in the field of high-strength thick steel plates, can solve the problems of difficult control of production scale, and achieve the effect of high-intensity welded joints with excellent toughness and improved safety.

Active Publication Date: 2017-10-24
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, the steel materials described in Patent Documents 1 and 2 with excellent brittle crack propagation stopping characteristics are steel materials with a specific structure obtained by cooling only the surface layer of the steel material once and then reheating and performing processing during the reheating. Difficult to control at production scale

Method used

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  • High-strength thick steel plate for high heat input welding excellent in brittle crack propagation stop characteristic and manufacturing method thereof
  • High-strength thick steel plate for high heat input welding excellent in brittle crack propagation stop characteristic and manufacturing method thereof
  • High-strength thick steel plate for high heat input welding excellent in brittle crack propagation stop characteristic and manufacturing method thereof

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Experimental program
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Embodiment

[0136] Melt molten steel (steel codes A to Q) of each composition shown in Table 1 using a converter, and make steel raw materials (slab thickness of 250mm or 300mm) by continuous casting, hot rolling to a plate thickness of 55 to 100mm, and then carry out Cool to obtain No.1-27 test steels. For some, tempering was also performed after cooling. Table 2 shows hot rolling conditions and cooling conditions.

[0137] From the obtained thick steel plate, a φ14mm JIS14A test piece was cut from 1 / 4 of the plate thickness so that the longitudinal direction of the test piece was at right angles to the rolling direction, and a tensile test was performed to measure the yield strength (YS) and tensile strength (TS).

[0138] In addition, in order to evaluate the toughness value, JIS 4 is cut out from the thickness surface layer part and the thickness center part (hereinafter, the thickness center part may be referred to as 1 / 2t part) so that the longitudinal direction of the test piece ...

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Abstract

The present invention provides a high-strength thick steel plate for high-energy-input welding with a plate thickness of 50 mm or more, which is excellent in brittle crack propagation stop characteristics, and a manufacturing method thereof. A thick steel plate having a specific composition, a metal structure mainly composed of bainite, and a texture in which the degree of aggregation of the RD / / (110) plane in the central part of the plate thickness is 1.5 to 4.0, and a method for manufacturing the same. structure, and the Charpy fracture transition temperature vTrs of the surface layer and the center of the plate thickness is ‑40°C or less.

Description

technical field [0001] The present invention relates to a high-strength thick steel plate for high heat input welding with excellent brittle crack arrestability (brittle crack arrestability) and a manufacturing method thereof, particularly to a steel plate suitable for use in ships High-strength thick steel plate with a plate thickness of 50 mm or more. Background technique [0002] For large structures such as ships, accidents associated with brittle fractures have a large impact on the economy and the environment. Therefore, improvement of safety is generally required, and toughness at service temperature and brittle crack propagation stop characteristic are required for the steel material to be used. [0003] Vessels such as container ships and bulk carriers use high-strength thick-walled materials as the outer plate of the ship's hull in their structures. Recently, with the enlargement of ship hulls, high-strength and thick-walled materials have been further developed....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D1/26C21D8/02C22C38/14C22C38/58
CPCC21D8/0226C21D2201/05C21D2211/002C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/20C22C38/26C22C38/28C22C38/38C22C38/42C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 长谷和邦竹内佳子三田尾真司
Owner JFE STEEL CORP
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