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Method for moulding high-strength steel semichord pipe

A technology of high-strength steel and forming method, applied in the direction of slender components, building components, etc., can solve the problems of uneven performance of hot-pressed half-chord tubes, unreleasable stress, easy cracks, etc., so as to reduce the repair time. And cost, performance uniform and reliable effect

Active Publication Date: 2015-03-18
烟台铁中宝钢铁加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a high-strength steel half-chord forming process of hot pressing and heat treatment to solve the problem that the cold-pressing process requires a large press, but the pressed half-chord is relatively short, and the stress cannot be released , It is easy to produce cracks and other defects during welding, thus effectively reducing the time and cost of rework
[0008] Another object of the present invention is to solve the problem of inhomogeneous performance of each part of the thermoformed semi-chord

Method used

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  • Method for moulding high-strength steel semichord pipe
  • Method for moulding high-strength steel semichord pipe
  • Method for moulding high-strength steel semichord pipe

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Embodiment Construction

[0043] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims of the present invention.

[0044] Such as figure 1 As shown, the half-chord 1000 involved in the present invention is a high-strength steel half-chord, which is mainly used in the construction of pile legs of jack-up drilling platforms in marine engineering. It should be noted that the high-strength steel mentioned in the present invention refers to the yield Quenched and tempered alloy steel with a strength above 690Mpa. However, for quenched and tempered alloy steels with a yield strength lower than 690Mpa, if the method of the present invention is used to process half-chord pipes, if only the heating temperature, heat preservation, and pressure holding time a...

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Abstract

The invention discloses a method for moulding a high-strength steel semichord pipe, which comprises the steps of: cutting: cutting a high-strength steel plate into a proper-width square steel plate blank; heating compression: after heating the square steel plate blank to 30-50 DEG C above AC3, preserving heat and compressing the square steel plate blank to a semichord pipe by a corresponding die; quenching: transversely arranging the semichord pipe into a heating furnace in parallel, preserving heat after heating to 30-50 DEG C above AC3 and flatly arranging the semichord pipe for quenching and cooling at the cooling speed of larger than a critical value; heating-temperature tempering: heating the quenched semichord pipe to more than 550-650 DEG C and preserving heat; and cooling to room temperature. The semichord pipe manufactured by the method disclosed by the invention is longer, the performance of all parts is uniform, and a plurality of semichord pipes can be also manufactured simultaneously.

Description

technical field [0001] The invention relates to a method for forming a half-chord, in particular to a method for forming a high-strength steel half-chord, which is suitable for the field of leg construction of jack-up drilling platforms in marine engineering. Background technique [0002] At present, half-pipe forming rolling machines are mostly used in China to solve the problem of one-time forming of steel strips. For example, the Chinese invention patent published on March 8, 2009 with the invention name "a half-pipe forming rolling machine" The rolling machine disclosed in the application is mainly used for rolling semi-pipes with low rigidity and good flexibility, but it is not suitable for forming high-strength steel semi-chords. [0003] Existing half-chord pipes used in the construction of pile legs of jack-up drilling platforms in marine engineering are made of special high-yield-strength alloy steel plates with excellent mechanical properties. Its forming method h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16S3/00
Inventor 郝学军王德江刘金程季春晓朱立军荆仁三孙禄吉
Owner 烟台铁中宝钢铁加工有限公司
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