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HRB500 and HRB500E coiled reinforcing steel bar production process

A production process and screw coil technology, applied in the field of iron and steel metallurgy process, can solve the problems of unqualified mechanical performance indicators, negative profit, delivery and other problems, and achieve the effect of excellent performance indicators

Active Publication Date: 2013-07-31
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first disadvantage is the use of more alloys, resulting in an increase in production costs. At the same time, in order to ensure the strength index, the weight deviation can only be controlled at the upper limit, which is not conducive to delivery according to the negative weight deviation. Selling at the market price will indirectly cause a further increase in production costs and even negative profits
The second disadvantage is that the cooling process has not been well utilized, which greatly wastes the cooling capacity of the fan equipment and the strengthening effect of the alloy; of course, if the cooling process is not well controlled, it is easy to produce abnormal structures such as bainite and martensite, resulting in Unqualified mechanical properties, prone to brittle fracture
[0006] The second is the production process of ultra-low temperature rolling + ultra-low temperature spinning, such as ≤850°C final rolling and ≤750°C spinning. Not only are production accidents prone to occur, but also the motor loss and equipment wear are relatively large. At the same time, the production of wire rod produced by this process is low, and the rolling cost is high.
At the same time, during small-scale production, due to the large water volume and water pressure of the water cooling, it is easy to cause steel blockage in the water tank, resulting in production accidents

Method used

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  • HRB500 and HRB500E coiled reinforcing steel bar production process
  • HRB500 and HRB500E coiled reinforcing steel bar production process
  • HRB500 and HRB500E coiled reinforcing steel bar production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Brand: HRB500E, specification: Φ6mm, rolling season: winter.

[0037] Billet heating→temperature-controlled rolling→temperature-controlled cooling→coil collection→inspection→packing.

[0038] The chemical composition is shown in Table 4, and the raw material is: 150×150×12000mm continuous casting billet.

[0039] Table 4 HRB500E steel bar chemical composition unit: (%)

[0040] C Si mn V P S Fe 0.20 0.50 1.40 0.09 0.012 0.017 margin

[0041] The steel billet is subjected to three-stage heating treatment, the temperature of the first heating section is 800-950°C, the temperature of the second heating section is 950°C-1100°C, and the temperature of the soaking section is 1050°C-1150°C;

[0042] In the temperature-controlled rolling process, the starting rolling temperature is 950-1050°C, the flow rate and pressure of the water tank before the finishing rolling are controlled, the finishing rolling temperature is controlled at 900-930°C, a...

Embodiment 2

[0048] Brand: HRB500E, specification: Φ12mm. Rolling season: winter.

[0049] Billet heating→temperature-controlled rolling→temperature-controlled cooling→coil collection→inspection→packing.

[0050] The chemical composition is shown in Table 6, and the raw material is: 150×150×12000mm continuous casting billet.

[0051] Table 6 HRB500E steel bar chemical composition unit: (%)

[0052] C Si mn V N P S Fe 0.21 0.55 1.45 0.08 0.015 0.017 0.021 margin

[0053] The steel billet is subjected to three-stage heating treatment, the temperature of the first heating section is 800-950°C, the temperature of the second heating section is 950°C-1100°C, and the temperature of the soaking section is 1050°C-1150°C;

[0054] In the temperature-controlled rolling process, the starting rolling temperature is 950-1050°C, the flow rate and pressure of the water tank before the finishing rolling are controlled, the finishing rolling temperature is controlled at 88...

Embodiment 3

[0060] Brand: HRB500, specification: Φ8mm, rolling season: summer.

[0061] Billet heating→temperature-controlled rolling→temperature-controlled cooling→coil collection→inspection→packing.

[0062] The chemical composition is shown in Table 8, and the raw material is a 150×150×12000mm continuous casting billet.

[0063] Table 8 HRB500E steel bar chemical composition unit: (%)

[0064]

[0065] The steel billet is subjected to three-stage heating treatment, the temperature of the first heating section is 800-950°C, the temperature of the second heating section is 950°C-1100°C, and the temperature of the soaking section is 1050°C-1150°C;

[0066] In the temperature-controlled rolling process, the starting rolling temperature is 950-1050°C, the flow rate and pressure of the water tank before the finishing rolling are controlled, the finishing rolling temperature is controlled at 880-900°C, and the finishing rolling speed is controlled at 72m / s;

[0067] In the temperature-co...

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Abstract

The present invention relates to a HRB500 and HRB500E coiled reinforcing steel bar production process, which comprises the following process: A, heating a steel billet, wherein three-stage type heating is adopted, the steel billet adopts V or VN microalloying, a size is 150 mm*150 mm, a temperature of a first-stage heating segment of the steel billet heating process is 800-950 DEG C, a temperature of a second-stage heating segment is 950-1100 DEG C, and a soaking segment temperature is 1050-1150 DEG C; B, carrying out temperature control rolling, wherein a rolling starting temperature is 950-1050 DEG C, a finish rolling starting temperature is controlled to 850-930 DEG C, and a final rolling speed is controlled to 27-100 m / s; C, carrying out temperature control cooling, wherein a laying temperature is controlled to 820-870 DEG C, a cooling fan is opened to carry out rapid cooling, a cooling rate is controlled to 8-25 DEG C / sec, a final cooling temperature is controlled to 650-680 DEG C, and natural cooling or slow cooling is performed; D, collecting the coiled material; E, inspecting; and F, packaging. The process has characteristics of controllable process, low production cost, and high production efficiency, wherein yield strengths of the produced HRB500 and HRB500E coiled reinforcing steel bars are more than or equal to 500 MPa, tensile strengths are more than or equal to 630 MPa, yield strength ratios are more than or equal to 1.25, elongation rates are more than or equal to 15%, the total elongation rates under the maximum force are more than or equal to 9.0%, performance indexes are excellent, and the produced HRB500 and HRB500E coiled reinforcing steel bars are uniform and stable.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy technology, and in particular relates to a HRB500, HRB500E coil production process. Background technique [0002] Hot-rolled ribbed steel bar for reinforced concrete is a kind of reinforcing material widely used in various construction projects at home and abroad, and it is also a key product mass-produced by various steel factories in my country's metallurgical industry. With the rapid development of the construction industry, higher quality standards have been put forward for this product, requiring its performance to have high strength and good plasticity, weldability, fatigue resistance and cohesiveness to meet the needs of high-rise buildings, It meets the needs of high-end construction projects such as large-span, earthquake resistance, and low temperature resistance. [0003] my country's hot-rolled ribbed steel bars are classified into three grades according to the yield...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/08
Inventor 梁云科刘学森徐庆龙
Owner TIANJIN IRON & STEEL GRP
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