Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of high-strength corrosion-resistant steel bar and heat treatment method thereof

A heat treatment method and corrosion-resistant technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of insufficient strength, low Ni content, high price, etc., and achieve excellent mechanical properties and good corrosion resistance.

Active Publication Date: 2020-05-08
HEBEI IRON AND STEEL
View PDF7 Cites 0 Cited by
  • 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 ≥ 13wt%) 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of high-strength corrosion-resistant steel bar and heat treatment method thereof
  • A kind of high-strength corrosion-resistant steel bar and heat treatment method thereof
  • A kind of high-strength corrosion-resistant steel bar and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The chemical composition and mass percentage of the high-strength 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-strength corrosion-resistant steel bars is as follows: put the high-strength 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 stacking temperature of the hot-rolled steel bars (diameter 20mm) is 350 ℃, the total mass of off-line hot-rolled steel bars is 4 times that of required heat-treated steel bars (diameter 80mm); when stacking, a layer of off-line hot-rolled steel bars equal to the number of required heat-treated steel bars shall be placed on the bottom of the slow cooling pit in advance. Then mix the required heat-treated steel bars with the hot-rolled steel bars just off the production line and put them into t...

Embodiment 2

[0033] The chemical composition and mass percentage of the high-strength 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-strength corrosion-resistant steel bars is as follows: put the high-strength 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 stacking temperature of the hot-rolled steel bars (diameter 40mm) is 280 ℃, 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 hot-rolled steel bars equal to the number of required heat-treated steel bars is laid in advance on the bottom of the slow cooling pit, Then mix the required heat-treated steel bars with the hot-rolled steel bars just off the production line and put them into the s...

Embodiment 3

[0036] The chemical composition and mass percentage of the high-strength 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-strength corrosion-resistant steel bars is as follows: put the high-strength corrosion-resistant steel bars that need heat treatment together with the hot-rolled steel bars that have just come off the production line into the slow cooling pit for stacking, and the stacking temperature of the hot-rolled steel bars (diameter 28mm) is 450 ℃, the total mass of off-line hot-rolled steel bars is three times that of the required heat-treated steel bars (diameter 22mm); when stacking, a layer of off-line hot-rolled steel bars with the same quantity as the required heat-treated steel bars is laid on the bottom of the slow cooling pit in advance, Then mix the required heat-treated steel bars with the hot-rolled steel bars just off the production line a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a high-strength and corrosion-resistant rebar and a heat treatment method thereof. The high-strength and corrosion-resistant rebar comprises, by mass, 0.041-0.075% of C, less than or equal to 0.56% of Si, less than or equal to 0.45% of Mn, 5.2-6.3% 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,0.01-0.14% of Sn and the balance Fe and inevitable impurities. According to the heat treatment method, the high-strength and corrosion-resistant rebar needing to be subjected to heat treatment and ahot-rolled rebar which is discharged recently are put in a slow cooling pit for stack cooling together, the stacking temperature is 200 DEG C or higher, and stack cooling time is one hour or longer. 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-strength 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 content (gene...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22C38/44C22C38/42C22C38/48C22C38/02C22C38/04C21D9/52
CPCC21D9/525C22C38/002C22C38/008C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48
Inventor 张贺佳张俊粉胡心光张晓磊房超张志华
Owner HEBEI IRON AND STEEL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com