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High-carbon-equivalent corrosion-resistant rebar and heat treatment method thereof

A heat treatment method and high carbon equivalent technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of insufficient strength, low Ni content, increased production costs, etc., and achieve excellent mechanical properties and good corrosion resistance.

Active Publication Date: 2018-08-24
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, HRB400 rebar is the most widely used steel bar in the market, but its strength and corrosion resistance cannot meet the requirements of high-performance buildings.
Austenitic stainless steel has good corrosion resistance and ductility, but its strength is insufficient and expensive
In addition, austenitic stainless steel contains precious metal Ni, which is a national strategic resource, so it is protected or restricted by various countries for export
Although ferritic stainless steel also has excellent corrosion resistance, due to its high Cr content (generally ≥13 wt%) and low Ni content, its mechanical properties and weldability are poor
At the same time, ferritic stainless steel requires as low a C content as possible, otherwise martensite or supersaturated solid solution will be formed even under air-cooled conditions after hot rolling. If tempering is carried out in the subsequent heat treatment furnace, the production cycle will be longer. higher cost
In addition, after the C content is reduced to a certain level in the steelmaking process, if the C content continues to be reduced, the production cost will be significantly increased

Method used

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  • High-carbon-equivalent corrosion-resistant rebar and heat treatment method thereof
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  • High-carbon-equivalent corrosion-resistant rebar and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The chemical composition and mass percentage of the high carbon equivalent corrosion-resistant steel bars in this example are shown in Table 1, and the performance test results are shown in Table 3.

[0031] The heat treatment method of high carbon equivalent corrosion-resistant steel bars is as follows: put the high carbon equivalent corrosion-resistant steel bars that need heat treatment together with the hot-rolled steel bars that have just come off the line into the slow cooling pit for stacking, and the stack of hot-rolled steel bars (diameter 35mm) The stacking temperature is 550°C, and the total mass of off-line hot-rolled steel bars is 4 times that of the required heat-treated steel bars (diameter 64mm); when stacking, a layer of off-line steel bars with the same number of required heat-treated steel bars should be laid in advance at the bottom of the slow cooling pit Hot-rolled steel bars, and then mix the required heat-treated steel bars with the hot-rolled ste...

Embodiment 2

[0033] The chemical composition and mass percentage of the high carbon equivalent corrosion-resistant steel bars in this example are shown in Table 1, and the performance test results are shown in Table 3.

[0034] The heat treatment method of high carbon equivalent corrosion-resistant steel bars is as follows: put the high carbon equivalent corrosion-resistant steel bars that need heat treatment together with the hot-rolled steel bars that have just come off the line into the slow cooling pit for stacking, and the stack of hot-rolled steel bars (diameter 40mm) The stacking temperature is 420°C, and the total mass of off-line hot-rolled steel bars is 5 times that of the required heat-treated steel bars (diameter 10mm); when stacking, a layer of off-line steel bars with the same number of required heat-treated steel bars should be laid in advance at the bottom of the slow cooling pit Hot-rolled steel bars, and then mix the required heat-treated steel bars with the hot-rolled ste...

Embodiment 3

[0036] The chemical composition and mass percentage of the high carbon equivalent corrosion-resistant steel bars in this example are shown in Table 1, and the performance test results are shown in Table 3.

[0037] The heat treatment method of high carbon equivalent corrosion-resistant steel bars is as follows: put the high carbon equivalent corrosion-resistant steel bars that need heat treatment together with the hot-rolled steel bars that have just come off the line into the slow cooling pit for stacking, and the stack of hot-rolled steel bars (diameter 20mm) The stacking temperature is 710°C, and the total mass of off-line hot-rolled steel bars is three times that of the required heat-treated steel bars (diameter 80mm); when stacking, lay a layer of off-line steel bars with the same number of required heat-treated steel bars in advance at the bottom of the slow cooling pit Hot-rolled steel bars, and then mix the required heat-treated steel bars with the hot-rolled steel bars...

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Abstract

The invention discloses a high-carbon-equivalent corrosion-resistant rebar and a heat treatment method thereof. The high-carbon-equivalent corrosion-resistant rebar comprises, by mass, 0.11-0.15% of C, less than or equal to 0.56% of Si, less than or equal to 0.45% of Mn, 3.2-4.3% of Cr, 0.5-0.6% of Ni, 0.78-1.1% of Mo, 0.13-0.27% of Cu, less than or equal to 0.05% of P, 0.01-0.14% of Nb, 0.01-0.15% of Zn, 0.03-0.15% of Ti and the balance Fe and inevitable impurities. According to the heat treatment method, the high-carbon-equivalent corrosion-resistant rebar needing to be subjected to heat treatment and hot-rolled rebar which is discharged recently are put in a slow cooling pit for stack cooling together, the stack cooling temperature is 310-710 DEG C, and stack cooling time is one hour orlonger. The rebar has the high corrosion resistance and excellent mechanical performance, the production cost is low, and the application prospects are wide.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a high carbon equivalent corrosion-resistant steel bar and a heat treatment method thereof. Background technique [0002] With the continuous development of large and complex building structures, higher requirements are placed on the strength and corrosion resistance of steel bars. At present, HRB400 rebar is the most widely used steel bar in the market, but its strength and corrosion resistance cannot well meet the requirements of high-performance buildings. Austenitic stainless steel has good corrosion resistance and ductility, but its strength is insufficient and the price is expensive. In addition, austenitic stainless steel contains precious metal Ni, and Ni is a national strategic resource, so it is protected or restricted by various countries for export. Although ferritic stainless steel also has excellent corrosion resistance, due to its high Cr cont...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/42C22C38/48C22C38/50C22C38/02C22C38/04C21D9/52
CPCC21D9/525C22C38/002C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48C22C38/50
Inventor 张贺佳张俊粉胡心光王金星王征王林
Owner HEBEI IRON AND STEEL
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