Optical round wire rod reinforcement bar for producing prestressed concrete steel rod and processing method

Abstract

The invention discloses an optical round wire rod reinforcement bar for producing a prestressed concrete steel rod and a processing method. A steel blank comprises in percentage by weight: 0.25-0.30% of C, 0.90-1.10% of Si, 0.50-0.70% of Mn, 0.015-0.030% of Nb, 0.0020-0.0040% of B, no more than 0.020% of S, no more than 0.020% of P and the balance of Fe and inevitable impurities; the optical round wire rod reinforcement bar with the nominal diameter of 8.0-14.0mm is produced by heating and performing controlled rolling and controlled cooling to the steel blank, and has the following characteristics that the tensile strength (Rm) is 630-660MPa, the percentage reduction of area is more than or equal to 65%, and the ferrite grain size is 10.0-11.5 level. Through integration and creation of converter melting, LF melting, steel blank heading and multiple technology of standard and delay type controlled rolling and controlling cooling and the like, the invention provides a production method of the optical round wire rod reinforcement bar for producing the prestressed concrete steel rod, and the product is high in hardenability, and uniform in microscopic structure. The method has the advantages of excellent quality, low production cost, good processability, strong popularization and the like.

Description

technical field [0001] The invention belongs to the technical field of processing and forming of metal materials, and in particular relates to a steel bar for making prestressed concrete steel rods and a processing method thereof. Background technique [0002] Steel rods for prestressed concrete (also known as PC steel rods) is a new type of high-efficiency and energy-saving building material. Its development and promotion were first seen in Japan in the 1980s and 1990s. Produced by the process of "drawing and reducing→scoring→quenching→tempering", the product has the characteristics of high strength and toughness, low relaxation, good weldability, good upsetting forgeability, good concrete adhesion, etc., and is widely used in In high prestressed components of various construction projects, such as high-strength prestressed concrete centrifugal pipe piles, electric poles, viaduct piers, and high prestressed components of railway sleepers. Due to the improvement of strength...

AI Technical Summary

Problems solved by technology

[0003] With the increasing market demand for steel bars for prestressed concrete and the increase in steel bar production lines, the production of special smooth steel bars for PC steel bars has increasingly become a restrictive key link. The quality problems caused a series of problems in the production and use of steel bars for prestressed concrete, such as: steel bars frequently break during the drawing and reducing process, the strength of steel bars fluctuates greatly, and the elongation is low. Hysteresis breaks during the process, etc.

The emergence of these problems, first, affects the construction progress of construction projects using steel rods for prestressed concrete, affects the enthusiasm of project investors to use new high-efficiency and energy-saving materials, and leads to delays in the promotion and application of steel rods for prestressed concrete ; Second, the enthusiasm of the steel bar production enterprises is affected and the economic interests are lost

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