Cl- corrosion resistant high-strength low-alloy steel bar and production method thereof

A high-strength, low-alloy, steel bar technology, applied in the field of steel bars, can solve the problems of increasing the thickness and compactness of the protective layer, unfavorable and aggravating structural load-bearing, and achieve the effect of good welding performance and mechanical connection performance and economical cost.

Inactive Publication Date: 2010-05-19
CENT IRON & STEEL RES INST
View PDF0 Cites 38 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Increasing the thickness and density of the protective layer is detrimental to the load bearing of the structure, and the cost also needs to be considered
Epoxy-coated and galvanized steel bars are prone to damage during transportation, resulting in increased localized corrosion
And at high Cl - Under the condition of high concentration, the coated steel bar is easy to delaminate, which accelerates the corrosion of the steel bar
A large amount of alloying elements Cr and Ni are added to the existing stainless steel bars, and the chromium content is generally not less than 12%, and the high one even reaches 18%. The material price is high and cannot be widely used

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
  • Cl- corrosion resistant high-strength low-alloy steel bar and production method thereof
  • Cl- corrosion resistant high-strength low-alloy steel bar and production method thereof
  • Cl- corrosion resistant high-strength low-alloy steel bar and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The ingredients described in Table 1 have undergone steelmaking, continuous casting, and hot rolling. The rolling process adopts the production process of fine-grained steel (starting rolling temperature is 900-950 ° C, controlled rolling temperature is 850 ° C ± 30 ° C, controlled cooling after rolling The temperature is not lower than 600 ℃), rolled into a φ16mm threaded steel bar, and its mechanical properties are shown in Table 2. In order to test the resistance to Cl of steel bar described in the present invention - Corrosion performance, with ordinary carbon steel as a comparison steel, the following experiments were carried out:

[0018] Table 1

[0019]

[0020]

[0021] Table 2: Mechanical properties of test steel

[0022]

[0023] Refer to TB / T 2375-93 Periodic Infiltration Corrosion Test Method of Weathering Steel for Railways to set the test solution concentration, pH value and accelerated corrosion time. The test conditions are as follows:

[0...

Embodiment 2

[0037] Using the ingredients described in Table 5, after steelmaking, continuous casting, and hot rolling, the rolling process adopts the production process of fine-grained steel (starting rolling temperature 900-950°C, controlled rolling temperature at 850°C ± 30°C, controlled rolling after rolling The cold temperature is in the range of 600 ° C ~ 750 ° C, rolled into a φ20mm threaded steel bar, its mechanical properties are shown in Table 6. The test method in Example 1 was used to test the Cl resistance of the test steel - Corrosion performance, the average corrosion rate of test steel and comparison steel is shown in Table 7.

[0038] Table 5: Test steel composition

[0039] Test steel number

C

Si

mn

P

S

Cr

Cu

Ni

Nb

illustrate

0 #

0.23

0.36

0.74

0.017

0.042

0.020

0.015

/

＜0.005

contrast steel

11 #

0.19

0.64

1.12

0.068

0.008

0...

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 Cl- corrosion resistant high-strength low-alloy steel bar and a production method thereof, and belongs to the technical field of steel bars. The alloy in a basic alloy system comprises the following elements in percentage by weight: 0.08 to 0.25 percent of C, 0.35 to 1.1 percent of Si, 0.7 to 2.0 percent of Mn, 0.05 to 0.10 percent of P, 0.010 percent of S, 0.30 to 1.60 percent of Cr, 0.2 to 0.80 percent of Cu, 0.2 to 1.0 percent of Ni, and the balance of Fe and inevitable impurity elements; and one or more of micro alloy elements comprising V, Nb, Ti, B and the like can be added with trace according to the performance requirement of the steel bar, and the total amount of the micro alloy elements is controlled in a range of 0.01 to 0.5 percent. The steel bar has the advantage of economic and reasonable cost, and the Cl- corrosion resistance of the steel bar is obviously superior to that of carbon steel. The performance index of the steel bar meets the requirement of 400MPa-grade steel bars in GB1499-2007; and the steel bar has good welding performance and mechanical connection performance, and is applied to a concrete structure with durability design requirement under the marine environment condition.

Description

technical field [0001] The invention belongs to the technical field of steel bars, in particular to a Cl-resistant - Corroded high-strength low-alloy steel bars and production method having excellent resistance to Cl - Corrosion performance, its performance index meets the requirements of GB1499-2007, and it is suitable for use in concrete structures with durability design requirements under marine environmental conditions. Background technique [0002] Reinforced concrete is an economical and convenient building material. However, its corrosion deterioration directly affects the durability of buildings. Among them, with Cl - Corrosion damage is the most serious. my country's mainland coastline is 18,400 kilometers long, and large-scale infrastructure is mostly concentrated in coastal areas, especially marine projects such as wharves, slope protection, and protection dikes, which are caused by chloride ions. Corrosion and damage to steel bars are very prominent. At the ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/42C22C38/46C22C38/48C22C38/50C22C38/54C21D8/06B21B37/74
Inventor 杨忠民王向东陈颖王慧敏陈小平
Owner CENT IRON & STEEL RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap