Method for stabilizing performance of edge components of reinforcing steel bars and application of method

Abstract

The invention discloses a method for stabilizing the performance of edge components of reinforcing steel bars and application of the method, relates to the technical field of steel smelting, and solves the problems that the raw material cost of an existing steel alloy preparation method is low, and the performance of the edge components of a prepared steel alloy product is poor. The method comprises the following steps: S1, optimizing raw material selection; s2, the total converter loading amount, the semi-steel loading amount and the waste steel adding amount are controlled to be at first preset parameters; s3, starting smelting, and ending the converter when the components of the molten steel reach a second preset parameter; s4, controlling the temperature of the molten steel before nitrogen blowing as a third preset parameter; s5, the molten steel nitrogen blowing time is controlled to be a fourth preset parameter; and S6, after nitrogen blowing, forming, hot rolling, cooling, shearing and packaging are conducted to obtain the finished steel alloy, the yield strength of the final product is controlled to be 450-465 MP, the yield strength ratio is larger than 1.35, and the invention further provides application of the method in steel alloy smelting.

Description

Technical Field

[0001] The invention relates to the technical field of steel smelting, and in particular to a method for stabilizing the edge component properties of steel bars and an application thereof. Background Art

[0002] In steel smelting, if the selected raw materials are not ideal or there is negligence in the smelting process, C, Mn, and V will be below the internal control line, resulting in poor marginal component performance of the obtained steel alloy products, such as yield strength and strength-to-yield ratio, which are easy to exceed the internal control standards.

[0003] At the same time, the cost of raw materials for preparing steel alloys is relatively high, which makes the manufacturing cost of enterprises relatively high. How to achieve stable production, stable product performance and marginal component performance while reducing alloy costs has become a difficult problem that each enterprise needs to solve. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of raw material cost of existing methods for preparing steel alloys and poor edge component performance of the prepared steel alloy products. The present invention provides a method for stabilizing the edge component performance of steel bars.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] In one aspect, the present invention provides a method for stabilizing the edge component properties of a steel bar, the method comprising the following steps:

[0007] S1. Optimize raw material selection;

[0008] S2, controlling the total loading amount of the converter, the loading amount of semi-steel and the amount of scrap steel added to the first preset parameter;

[0009] S3, start smelting, and end the converter when the molten steel composition reaches the second preset parameter;

[0010] S4, controlling the temperature of the molten steel before nitrogen blowing to be a third preset parameter;

[0011] S5, controlling the nitrogen blowing time of the molten steel to be the fourth preset parameter;

[0012] S6. After nitrogen blowing, the finished steel alloy is formed, hot rolled, cooled, sheared and packaged to obtain the finished steel alloy. The yield strength of the final product is controlled to be 450-465MP and the strength-to-yield ratio is greater than 1.35.

[0013] Furthermore, the raw material selection in S1 is specifically that the parameters of the selected raw material ore are: TFe≥55%, S≤0.12%, and P≤0.12%.

[0014] Furthermore, in S2, the total charge amount of the converter is 86-90t.

[0015] Furthermore, in S2, the semi-steel loading amount is 81-85t.

[0016] Furthermore, in S2, the amount of scrap steel added is 3 to 6 t.

[0017] Furthermore, in S3, the second preset parameters of the molten steel composition are C: 0.05-0.10%, P≤0.025%, S≤0.040%.

[0018] Furthermore, in S4, the third preset parameter is greater than or equal to 1570°C.

[0019] Furthermore, in S5, the fourth preset parameter of the nitrogen blowing time is greater than 6 minutes.

[0020] Furthermore, in S6, the molding method is continuous casting.

[0021] On the other hand, the present invention also provides application of the above-mentioned method for stabilizing the edge component properties of steel bars in steel alloy smelting.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] 1. The method for stabilizing the edge component performance of steel bars involved in the present invention optimizes the raw material selection; controls the total converter charge, semi-steel charge and scrap steel addition, molten steel composition, molten steel temperature before nitrogen blowing, and molten steel nitrogen blowing time within preset parameters, thereby optimizing the edge component performance of steel alloys, optimizing the yield strength and strength-to-yield ratio of the product steel alloy so that they do not exceed the internal control standard, solving the problems of raw material cost of the existing method for preparing steel alloys and poor edge component performance of the prepared steel alloy products, achieving stable production, and reducing alloy costs at the same time, which can reduce the alloy cost by at least 2.0 yuan / ton.

[0024] 2. The application of the method for stabilizing the edge component performance of steel bars involved in the present invention has a wide range of applications, universality and high superiority.

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0027] All other obtained embodiments belong to the protection scope of the present invention. DETAILED DESCRIPTION

[0028] First, the present invention provides a method for stabilizing the edge component performance of steel bars, the method comprising the following steps:

[0029] S1. Optimize raw material selection;

[0030] S2, controlling the total loading amount of the converter, the loading amount of semi-steel and the amount of scrap steel added to the first preset parameter;

[0031] S3, start smelting, and end the converter when the molten steel composition reaches the second preset parameter;

[0032] S4, controlling the temperature of the molten steel before nitrogen blowing to be a third preset parameter;

[0033] S5, controlling the nitrogen blowing time of the molten steel to be the fourth preset parameter;

[0034] S6. After nitrogen blowing, the finished steel alloy is formed, hot rolled, cooled, sheared and packaged to obtain the finished steel alloy. The yield strength of the final product is controlled to be 450-465MP and the strength-to-yield ratio is greater than 1.35.

[0035] It can be understood that the method for stabilizing the edge component performance of steel bars involved in the present invention optimizes the raw material selection; controls the total converter charge, semi-steel charge and scrap steel addition, molten steel composition, molten steel temperature before nitrogen blowing, and molten steel nitrogen blowing time within preset parameters, can optimize the edge component performance of steel alloys, optimize the yield strength and strength-to-yield ratio of the product steel alloy, control the yield strength of the final product to 450-465MP, and the strength-to-yield ratio to be greater than 1.35, so that it does not exceed the internal control standard, solves the problems of raw material cost of the existing method for preparing steel alloys and poor edge component performance of the prepared steel alloy products, realizes stable production, and at the same time realizes alloy cost reduction, which can reduce the alloy cost by at least 2.0 yuan / ton.

[0036] In certain embodiments of the present invention, the raw material selection in S1 is specifically that the parameters of the selected raw material ore are: TFe≥55%, S≤0.12%, and P≤0.12%.

[0037] In certain embodiments of the present invention, in S2, the total charge amount of the converter is 86-90t.

[0038] In certain embodiments of the present invention, in S2, the semi-steel loading amount is 81-85t.

[0039] In certain embodiments of the present invention, in S2, the amount of scrap steel added is 3 to 6 tons.

[0040] In certain embodiments of the present invention, in S3, the second preset parameters of the molten steel composition are C: 0.05-0.10%, P≤0.025%, S≤0.040%.

[0041] In some embodiments of the present invention, in S4, the third preset parameter is greater than or equal to 1570°C.

[0042] In certain embodiments of the present invention, in S5, the fourth preset parameter of the nitrogen blowing time is greater than 6 minutes.

[0043] In certain embodiments of the present invention, in S6, the molding method is continuous casting.

[0044] On the other hand, the present invention also provides the application of the above-mentioned method for stabilizing the edge component properties of steel bars in steel alloy smelting. It can be understood that the application of the method involved in the present invention has a wide range of applications, universality and high superiority.

[0045] The above embodiment is only one implementation of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A method for stabilizing the edge component properties of steel bars, characterized in that: The method comprises the following steps: S1. Optimize raw material selection; S2, controlling the total loading amount of the converter, the loading amount of semi-steel and the amount of scrap steel added to the first preset parameter; S3, start smelting, and end the converter when the molten steel composition reaches the second preset parameter; S4, controlling the temperature of the molten steel before nitrogen blowing to be a third preset parameter; S5, controlling the nitrogen blowing time of the molten steel to be the fourth preset parameter; S6. After nitrogen blowing, the finished steel alloy is formed, hot rolled, cooled, sheared and packaged to obtain the finished steel alloy. The yield strength of the final product is controlled to be 450-465MP and the strength-to-yield ratio is greater than 1.

35.

2. A method for stabilizing the edge component properties of steel bars according to claim 1, characterized in that: The raw material selection in S1 is specifically that the parameters of the selected raw material ore are: TFe≥55%, S≤0.12%, and P≤0.12%.

3. A method for stabilizing the edge component properties of steel bars according to claim 1, characterized in that: In S2, the total loading amount of the converter is 86-90t.

4. A method for stabilizing the edge component properties of steel bars according to claim 1, characterized in that: In S2, the semi-steel loading amount is 81-85t.

5. A method for stabilizing the edge component properties of steel bars according to claim 1, characterized in that: In S2, the amount of scrap steel added is 3 to 6 tons.

6. A method for stabilizing the edge component properties of steel bars according to claim 1, characterized in that: In S3, the second preset parameters of the molten steel composition are C: 0.05-0.10%, P≤0.025%, S≤0.040%.

7. A method for stabilizing the edge component properties of steel bars according to claim 1, characterized in that: In S4, the third preset parameter is greater than or equal to 1570°C.

8. A method for stabilizing the edge component properties of steel bars according to claim 1, characterized in that: In S5, the fourth preset parameter of the nitrogen blowing time is greater than 6 minutes.

9. A method for stabilizing the edge component properties of steel bars according to claim 1, characterized in that: In S6, the molding method is continuous casting.

10. Application of the method for stabilizing the edge component properties of steel bars according to any one of claims 1 to 9 in steel alloy smelting.