Ultralow cost low yield point steel and production method thereof

Abstract

The invention relates to an ultralow cost low yield point steel and a production method thereof. The ultralow cost low yield point steel comprises the following chemical components in percentage by weight: 0.005-0.05% of C, 0.15-0.25% of Si, 0.1-0.5% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S and the balance of Fe and inevitable impurity elements. The production method comprises a smelting process, a continuous casting, a rolling process and a thermal treatment process, in the rolling process, the heating temperature of a continuous cast blank before being rolled is 1150-1250 DEG C, a TMCP (Thermal Mechanical Control Processing) process is adopted for production, the rolling temperature at a first stage is controlled to be 1000-1050 DEG C, the rolling pass reduction rate is 15-20%, the rolling temperature at a second stage is controlled to be 900-950 DEG C, the rolling pass reduction rate is 10-15%, subsequently water-cooling is performed, and the self-tempering temperature is controlled to be 800-850 DEG C. The ultralow cost low yield point steel with stable property is obtained.

Description

technical field [0001] The invention relates to the technical field of iron and steel, in particular to an ultra-low-cost low-yield-point steel and a production method thereof. Background technique [0002] At present, the three principles of anti-seismic fortification of structures are "not damaged by small earthquakes, repairable by moderate earthquakes, and not collapsed by major earthquakes". However, during the earthquake, although a large number of buildings did not collapse, they were severely deformed and could not be used any longer. In order to reduce the losses caused by earthquakes, researchers have done a lot of research work on the anti-seismic aspects of buildings. The use of energy-dissipating anti-seismic components can improve the anti-seismic performance of building structures, and fully realize "economy for small earthquakes, not damaged by moderate earthquakes, It is easy to repair after a major earthquake, and the aftershocks will not collapse." [00...

AI Technical Summary

Problems solved by technology

Through low C design, supplemented by post-rolling heat treatment, but this method increases the manufacturing cost and difficulty of smelting steel plates

[0009] The Chinese patent with the publication number of CN101775536A discloses a 225MPa-level earthquake-resistant low-yield-strength steel and its manufacturing method. One or more, the design uses precious metal elements and is expensive

[0010] The Chinese patent with the publication number of CN101781736 discloses a kind of anti-seismic building steel with a yield strength of 225MPa and its production method. The alloy added in the scheme is difficult to smelt, the process is difficult to control, and the follow-up heat treatment takes a long time, which increases the production cycle and cost

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