A steel bar for high-strength prestressed concrete and its production process

A production process and prestressing technology, which is applied in the field of smelting, can solve problems such as hidden dangers in quality, economic loss, and poor performance of steel bars, and achieve the effects of strong resistance to hysteresis fracture, ensuring product qualification rate, and good upsetting performance

Active Publication Date: 2017-01-04
溧阳市万兴特种建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production process of steel rods for general prestressed concrete is setting-off—peeling and derusting—shape and groove—straightening—induction heating—quenching—tempering—cooling—transmission—shearing and splitting—rewinding, and the process cost is high. , a waste of steel, the process is complicated and inconvenient to operate, and the manufactured steel rods have disadvantages such as poor performance, poor ductility, and easy fracture. When these steel rods are applied to engineering and buildings, their hysteresis fracture sensitivity increases linearly, and the risk is high. This will cause immeasurable quality hidden dangers and huge economic losses to the steel bar industry for prestressed concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a steel bar for high-strength prestressed concrete, the chemical composition of which is: C: 0.25%, Si: 1.65%, Mn: 0.20%, Cr: 0.08%, Mo: 0.35%, V: 0.25 %, Nb: 0.08%, Ti: 0.50%, Ni: 0.25%, Ca: 0.30%, S: 0.025%, P: 0.010%, Cu: 0.15%, composite rare earth: 0.20%, and the balance is Fe;

[0041] The composition of compound rare earth is calculated by mass percentage: holmium: 5%, gadolinium: 8%, yttrium: 9%, cerium: 20%, praseodymium: 23%, neodymium: 12%, dysprosium: 14%, and the rest is lanthanum, The sum of the above components is 100%.

[0042] The production process of the above-mentioned high-strength prestressed concrete steel rod, the specific production process is as follows:

[0043] (1) The above components are used as raw materials through converter smelting, refining treatment, and continuous casting to obtain billets, and then the billets are heated to 1000°C through a walking heating furnace, and the heated billets are taken out of th...

Embodiment 2

[0057] This embodiment provides a steel bar for high-strength prestressed concrete, and its weight percentage chemical composition is: C: 0.20%, Si: 1.50%, Mn: 0.50%, Cr: 0.07%, Mo: 0.30%, V: 0.35 %, Nb: 0.05%, Ti: 0.42%, Ni: 0.15%, Ca: 0.25%, S: 0.015%, P: 0.015%, Cu: 0.20%, composite rare earth: 0.15%, and the balance is Fe;

[0058] The composition of compound rare earth is calculated by mass percentage: holmium: 8%, gadolinium: 9%, yttrium: 8%, cerium: 18%, praseodymium: 25%, neodymium: 15%, dysprosium: 11%, and the rest is lanthanum, The sum of the above components is 100%.

[0059] The production process of the above-mentioned high-strength prestressed concrete steel rod, the specific production process is as follows:

[0060] (1) The above components are used as raw materials through converter smelting, refining treatment, and continuous casting to obtain billets, and then the billets are heated to 1250°C through a walking heating furnace, and the heated billets are ta...

Embodiment 3

[0074] This embodiment provides a steel rod for high-strength prestressed concrete, the chemical composition of which is: C: 0.22%, Si: 1.85%, Mn: 0.35%, Cr: 0.09%, Mo: 0.33%, V: 0.30 %, Nb: 0.07%, Ti: 0.61%, Ni: 0.18%, Ca: 0.40%, S: 0.020%, P: 0.025%, Cu: 0.15%, composite rare earth: 0.30%, and the balance is Fe;

[0075] The composition of compound rare earth is calculated by mass percentage: holmium: 7%, gadolinium: 10%, yttrium: 10%, cerium: 15%, praseodymium: 24%, neodymium: 13%, dysprosium: 13%, and the rest is lanthanum, The sum of the above components is 100%.

[0076] The production process of the above-mentioned high-strength prestressed concrete steel rod, the specific production process is as follows:

[0077](1) The above-mentioned components are used as raw materials through converter smelting, refining treatment, and continuous casting to obtain billets, and then the billets are heated to 1500°C through a walking heating furnace, and the heated billets are take...

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PUM

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Abstract

The invention discloses a steel bar for high-strength prestressed concrete, the chemical composition of which is: C: 0.20-0.25%, Si: 1.50-1.85%, Mn: 0.20-0.50%, Cr: 0.07-0.09%, Mo: 0.30‑0.35%, V: 0.25‑0.35%, Nb: 0.05‑0.08%, Ti: 0.42‑0.61%, Ni: 0.15‑0.25%, Ca: 0.25‑0.40%, S≤0.025%, P≤0.025 %, Cu≤0.20%, compound rare earth: 0.15-0.30%, and the balance is Fe; the present invention also designs a production process of steel rods for high-strength prestressed concrete as follows: smelting to obtain steel billet-rolling-cooling treatment-the first Secondary rolling - heat treatment and stabilization treatment - gas nitriding treatment - spinning and coiling - bundling and storage.

Description

technical field [0001] The invention belongs to the technical field of smelting, and relates to a steel bar and a production process thereof, in particular to a high-strength prestressed concrete steel bar and a production process thereof. Background technique [0002] The production of prestressed steel in my country started in the early 1960s. Due to the influence of the planned economy, the technology was not developed and introduced until the late 1980s. At that time, the automation of domestic production equipment was relatively low and the process was discontinuous. The production efficiency of the prestressed steel bar products developed at the initial stage is very low, the cost is high, and it is difficult to form large-scale production. With the continuous deepening of my country's economic construction and reform and opening up, during the "Eighth Five-Year Plan" period, several domestic enterprises and research institutes jointly developed a continuous prestressed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C21D8/08
Inventor 姚圣法吴海洋
Owner 溧阳市万兴特种建材有限公司
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