Production system and method for high-ductility ribbed steel bar

Abstract

The invention discloses a production system and method for a high-ductility ribbed steel bar, and belongs to the field of steel bar cold rolling. The production system at least comprises two kinds ofrolling equipment and two kinds of heat treatment devices. The two kinds of rolling equipment comprise a rolling reducing mill and a rolling rib pressing machine. The two kinds of heat treatment devices comprise a primary heat treatment device and a secondary heat treatment device. The two kinds of the heat treatment devices are arranged at the front position and the rear position of the rolling rib pressing machine correspondingly. Temperature detectors are arranged behind the two kinds of the heat treatment devices. The primary heat treatment device, the secondary heat treatment device and the temperature detectors are also connected with a production line controller. The last steel bar rolling rib pressing processing is conducted after primary heat treatment, the hardness of the steel bar during cold rolling can be lowered, and therefore cold rolling power required in cold rolling can be reduced, energy is saved, and tensile strength and rate elongation are further improved throughsecondary heat treatment.

Description

technical field [0001] The invention relates to a production system and production method of steel bars, in particular to a production system and production method of high ductility ribbed steel bars, belonging to the field of cold rolling of steel bars. Background technique [0002] With the continuous development of my country's high-speed rail, the demand for steel bars used in high-speed rail is also rising sharply. However, the steel bars used in high-speed rail have special requirements. The steel bars are required to have both high ductility and certain tensile strength. Traditional The production of steel bars includes hot rolling and cold rolling. Compared with hot rolling, cold rolling is more environmentally friendly and stable. In cold rolling, the wire rod used is made of raw materials according to a certain proportion. Melting, rough rolling, intermediate rolling, finishing rolling, silk spinning, air cooling or water cooling, etc. to form wire rods, in the proce...

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Problems solved by technology

In other words: in the prior art, the characteristics of the product are all subjected to heat treatment after cold rolling to meet the characteristics of the product, without considering the characteristics of the product before processing. In fact, in the cold rolling production, the wire rod as the raw material is directly Cold rolling will destroy the crystal structure of the original wire rod, reduce its plasticity, and also reduce the strength of the steel bar to a certain extent. Even if it is heated in the subsequent heat treatment, the temperature of the heat treatment is far lower than The forming temperature of the wire rod when the wire rod was originally manufactured, therefore, it is difficult for the steel bar heat-treated after cold rolling to return to the grain structure after the wire rod quenching treatment. In addition, in order to improve the production efficiency during the heat treatment of the wire rod, Generally, the cooling speed of wire rod is fast, and it must be quenched to cool down quickly. Although the tensile strength of the steel bar is improved, its elongation rate is relatively low. However, if it is used for high-speed rail viaducts and ballastless tracks. In other words, the tensile strength, yield strength, and especially the elongation of steel bars are different from those of general buildings. The steel bars used in high-speed rail construction require both higher tensile strength, yield strength, and higher elongation. , if the original wire rod is directly cold-rolled, even if the ribbed steel bar is heat-treated in the later stage of forming, its tensile strength and elongation rate are difficult to be further improved on the basis of the existing cold-rolled technology. Further improving the tensile strength and elongation on the basis of the existing product indicators is a new topic for cold-rolled steel bar manufacturers

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