Method for moulding high-strength steel semichord pipe

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...

AI Technical Summary

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

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