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Preparation method of HRB500E coiled steel
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A HRB500E, coiled screw technology, applied in the field of HRB500E coiled steel preparation, can solve the problems of increasing the amount of microalloys added, large fluctuations, reduced tensile strength Rom, etc., to reduce hardenability, enhance stability, and avoid grains. coarse effect
Pending Publication Date: 2022-03-22
SHOUGANG CORPORATION
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[0003] (1) Rel fluctuates greatly, not only between the non-lapped point and the lapped point, but also the fluctuation range of the non-lapped point at the same position is over 100MPa, resulting in part of the yield strength being lower than the lower limit, and some exceeding the upper limit, Ro el / Rel failed;
[0004] (2) Rel fluctuates greatly. In order to ensure that the minimum value is not lower than the lower limit, it is necessary to increase the amount of microalloy added or increase the air-cooling strength, which causes a decrease in the uniform elongation Agt, resulting in partial Agt failure;
[0005] (3) The fluctuation is large. If in order to ensure that the maximum value is not greater than the upper limit, it is necessary to reduce the amount of microalloy added or reduce the air-cooling strength, which causes the tensile strength Rom to decrease, and some of them are unqualified, resulting in the strong yield ratio Rom / Roel failed
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[0046] Such as figure 1 , in the embodiment of the present application, the present invention provides a method for preparing HRB500E disc screw steel, the method includes the steps of:
[0048] S2: using the steel raw material to prepare molten steel;
[0049] S3: performing a steelmaking operation on the molten steel to obtain a steel ingot;
[0050] S4: Carrying out rolling operation on the steel ingot to obtain coil steel;
[0051] S5: Air-cooling the coiled steel to obtain HRB500E coiled steel.
[0052] In the embodiment of the present application, the chemical composition and mass percentage of the steel raw material in step S1 are: C: 0.22%-0.25%, Si: 0.50%-0.65%, Mn: 1.25%-1.35%, V: 0.065%- 0.075%, the balance is Fe and unavoidable impurities.
[0053] In the embodiment of the present application, the advantage of selecting the steel raw material according to the above chemical composition and mass percentage is that it can ...
Embodiment 1
[0093] The chemical composition and mass percentage of steel raw material of HRB500E coiled steel are:
[0094] Composition 1: C: 0.25%, Si: 0.65%, Mn: 1.35%, V: 0.075%, the balance is Fe and unavoidable impurities;
[0095] Composition 2: C: 0.23%, Si: 0.56%, Mn: 1.30%, V: 0.070%, the balance is Fe and unavoidable impurities;
[0096] Composition 3: C: 0.22%, Si: 0.50%, Mn: 1.25%, V: 0.065%, the balance is Fe and unavoidable impurities;
[0097] The production process of the HRB500E plate screw steel is as follows:
[0099] The steelmaking process and control are as follows: alloy is added at the end of the converter, continuous casting adopts full protection pouring, and the superheat does not exceed 35°C.
[0100] Steel rolling process and control are:
[0101] The rolling process is controlled by the following ...
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Abstract
The invention discloses a preparation method of HRB500E coiled steel. The method comprises the following steps: selecting a steel raw material; preparing molten steel by using the steel raw material; carrying out steelmaking operation on the molten steel to obtain a steel ingot; the steel ingot is subjected to steel rolling operation, and coiled steel is obtained; and the coiled steel is subjected to air cooling operation, and the HRB500E coiled steel is obtained. According to the preparation method of the HRB500E coiled steel, the content of Mn and the content of V are reasonably matched, the hardenability of the material is reduced, generation of undercooled structures such as bainite is avoided, and the problem that a yield platform of the HRB500E coiled steel is not obvious is avoided; the temperature range of each process point in the rolling process and the air cooling process of the HRB500E coiled screw with the specification of phi 6-phi 10 mm is reasonably controlled, the situation that original austenite grains are coarse and large, the stability is enhanced, so that bainite and other supercooled structures are formed is avoided, and the yield strength fluctuating in a narrow range and the uniform ductility are obtained.
Description
technical field [0001] The invention belongs to the technical field of production of high-strength anti-seismic reinforcement coil steel, and in particular relates to a preparation method of HRB500E coil steel. Background technique [0002] The main specifications of HRB500E high-strength anti-seismic steel coil are φ6mm, φ8mm, and φ10mm. Many domestic steel enterprises have carried out small-batch trial production successively. The problems exposed in the small-batch trial production are mainly reflected in the instability of the three seismic indicators and the large fluctuation range. , the problem of unqualified seismic index often occurs, which is also the most important obstacle for the full realization of seismic industrial production of straight steel bars and the lack of seismic industrial production of coiled snails. The three important indicators to measure the seismic performance of HRB500E high-strength aseismic steel coils are strength-to-yield ratio (Rom / Roel≥...
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