Thick specification hot-rolled steel sheet for roll forming high intensity metal sheet pile and manufacturing technology

Abstract

The invention relates to a high strength hot rolled plate and a production process thereof, in particular to a heavy gauge hot rolled steel plate for a roll bending forming high strength steel plate pile and a production process thereof. The invention mainly solves the technical problems of inadequate thickness, and lowcold bending performance and absorbed-in-fracture energy in the prior high strength heavy gauge steel plate. The technical proposal comprises: the heavy gauge hot rolled steel plate for the roll bending forming high strength steel plate pile comprises the following chemical components by weight percentage: 0.08 to 0.15 percent of C, 0.10 to 0.40 percent of Si, 0.30 to 0.90 percent of Mn, 0.020 to 0.040 percent of Nb, 0.010 to 0.030 percent of Ti, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, and the balance being Fe. The microscopic structures can be fine grain ferrites, and pearlitic structures plus a small amount of bainite structures which are dispersed; the grain size level is 11 to 14; and the banded structure level is less than 0.5. The high strength hot rolled plate is mainly used for producing the steel plate pile.

Description

Technical field: [0001] The invention relates to a high-strength hot-rolled plate and a manufacturing process thereof, in particular to a thick-spec hot-rolled steel plate for roll-formed high-strength steel sheet piles and a manufacturing process thereof. Background technique: [0002] Steel sheet piles are widely used components in civil engineering construction, and can be used in bridges, docks, unloading yards, embankment protection banks, parapet walls, retaining walls, breakwaters, diversion embankments, docks, gates and other projects. Cold-formed steel sheet piles generally have large wall thickness and complex cross-sectional shapes, especially the bending angle of the locking lugs on both sides reaches 180°, and the bending inner diameter is close to twice the thickness, which requires high cold-formed forming technology and material properties. They are all hot-rolled steel. With the development of roll forming technology, the size specifications, wall thickness...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a thick-gauge hot-rolled steel plate for roll-forming high-strength steel sheet piles and its manufacturing process that can meet the needs of thick-gauge high-strength roll-forming cold-formed steel sheet piles, and mainly solve the existing high-strength thick-gauge Due to the composition design and hot rolling process of the steel plate, there are obvious banded structures and composition segregation in the microstructure of the material, resulting in low cold bending performance and impact energy of thick specifications, which are prone to occur during the forming and use of steel sheet piles. Cracking phenomenon, can not meet the problem of cold-formed steel sheet pile production

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