Corrosion-resistant alloy material for prestressed steel strand and processing process of corrosion-resistant alloy material

A technology of prestressed steel strands and corrosion-resistant alloys, applied in the direction of improving process efficiency, can solve the problems of surface galvanized defects, low corrosion resistance, low strength, etc., to prevent the tendency of quenching cracking, prevent quenching cracking and The effect of internal cracking and uniform fine quenching

Inactive Publication Date: 2015-01-28
TIANSHUN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, only a single quenching method is generally used, so that the quenching cracking and internal cracking of the forging cannot be prevented. At the same time, the carbides cannot be further fully dissolved and cannot be uniformly diffused, so that the precipitation of carbides between the grains cannot be avoided. Corrosion and pitting corrosion exceeded the standard, which affected the technical effect of the previous post-smelting heat treatment process
[0003] At the same time, in our conventional steel strand galvanizing process, improper selection of galvanizing solution, concentration, PH value and electroplating current will result in poor electroplating effects, and poor activity in the electroplating solution will not only cause poor galvanizing Uniformity, and there will also be defects in the surface galvanizing. The electroplating is not uniform and smooth. Due to the impact of the use environment, it causes defects such as low corrosion resistance, poor high temperature resistance, low strength and short service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a corrosion-resistant alloy material for prestressed steel strands. The mass percentages of the chemical composition of the alloy material are: C: 0.26%, Si: 0.27%, Mn: 1.1%, P: 0.025%, Al: 0.8%, Cr: 0.38%, Ni: 0.50%, Mo: 0.20%, Cu: 0.22%, V: 0.025%, W: 0.08%, Zn: 13%, rare earth: 0.24%, the rest is Fe and trace impurities;

[0030] Among the rare earths, the following components are contained by weight percentage: Gd: 15-18%, Pr: 3-5%, Dy: 7-9%, Ac: 12.5-12.8%, Nd: 15-20%, Sm: 11- 13%, the balance is La;

[0031] In the present embodiment, the treatment process of the corrosion-resistant alloy material for the prestressed steel strand is specifically:

[0032] Step (1): During the smelting process of the electric arc furnace, first blow the electric arc furnace clean with nitrogen, then raise the temperature of the furnace to 620-660°C and then add the alloy material, then raise the temperature to 1300-1400°C and keep it warm for 2-3 hours;

...

Embodiment 2

[0043] This embodiment provides a corrosion-resistant alloy material for prestressed steel strands. The mass percentage of the chemical composition of the alloy material is: C: 0.25%, Si: 0.26%, Mn: 1.0%, P: 0.020%, Al: 0.7%, Cr: 0.35%, Ni: 0.45%, Mo: 0.15%, Cu: 0.1%, V: 0.02%, W: 0.05%, Zn: 12%, rare earth: 0.22%, the rest is Fe and trace impurities;

[0044] Among the rare earths, the following components are contained by weight percentage: Gd: 15%, Pr: 3%, Dy: 7%, Ac: 12.5%, Nd: 15%, Sm: 11%, and the balance is La;

[0045] In the present embodiment, the treatment process of the corrosion-resistant alloy material for the prestressed steel strand is specifically:

[0046] Step (1): During the smelting process of the electric arc furnace, first blow the electric arc furnace clean with nitrogen, then raise the temperature of the furnace to 620-660°C and then add the alloy material, then raise the temperature to 1300-1400°C and keep it warm for 2-3 hours;

[0047] Step (2): Re...

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Abstract

The invention discloses a corrosion-resistant alloy material for a prestressed steel strand and a processing process of the corrosion-resistant alloy material. As the following components are added in percentage by weight: 0.26-0.28 percent of Si, 1.0-1.2 percent of Mn and 0.35-0.45 percent of Cr, atom activity of carbon and nitrogen elements can be improved, therefore, air mass energy formed by atoms and dislocation form strong interaction; meanwhile, as refining is carried out by an LF furnace and degassing is carried out in a vacuum degassing furnace, corrosion resistance and abrasion resistance are remarkably improved. The corrosion-resistant alloy material for the prestressed steel strand and the processing process of the corrosion-resistant alloy material are capable of improving the corrosion resistance, abrasion resistance and oxidation resistance; the corrosion-resistant alloy material can be applied to various severe environments, is high in strength, good in hardenability, not easy to crack and uniform and smooth in surface zinc plating.

Description

technical field [0001] The invention relates to a corrosion-resistant alloy material for prestressed steel strands and a treatment process thereof. Background technique [0002] In the prior art, only a single quenching method is generally used, so that the quenching cracking and internal cracking of the forging cannot be prevented. At the same time, the carbides cannot be further fully dissolved and cannot be uniformly diffused, so that the precipitation of carbides in the intergranular area cannot be avoided, resulting in intergranular cracking. Corrosion and pitting exceeded the standard, which affected the technical effect of the previous post-smelting heat treatment process. [0003] At the same time, in our conventional steel strand galvanizing process, improper selection of galvanizing solution, concentration, PH value and electroplating current will result in poor electroplating effects, and poor activity in the electroplating solution will not only cause poor galvan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C21D8/06C25D7/06C25D3/22
CPCC21D8/065C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/18C25D3/22C25D7/0607Y02P10/20
Inventor 姚圣法吴海洋
Owner TIANSHUN GROUP
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