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Liquid zinc corrosion resistant high-boron cast steel and preparation method thereof

A technology of liquid zinc and high boron, applied in the field of metal materials, can solve the problems of easy wear and tear of flexible cloth, high price, and difficulty in steel production, and achieve excellent corrosion resistance of liquid zinc, good economic and social benefits, and improve equipment operation rate effect

Inactive Publication Date: 2008-05-14
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention overcomes the difficulty and high price of special steel products in the existing anti-corrosion method of zinc liquid; the coating construction is complicated and easy to fall off; the seepage layer is only suitable for small pieces and it is difficult to obtain a thick enough corrosion-resistant seepage layer; the refractory material zinc pot is expensive , small available space, vulnerable heating devices, etc.
The flexible cloth resistant to molten zinc corrosion of this invention is easy to wear and tear during use, and cannot guarantee the safety of industrial production
In addition, a small number of refractory metals (W, Mo, W-Mo alloys) have good corrosion resistance to liquid zinc [Hoffman N J and Minkoff I. Corrosion by Liquid Metal. New York: Plenum, 1970], but due to high cost, high brittleness, Difficult to process and easy to oxidize, it is difficult to popularize and apply in the galvanizing industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Melting high-boron cast steel with a 500 kg intermediate frequency induction furnace, the preparation process steps are as follows:

[0033] ①First, mix and heat industrial pure iron, low-carbon ferroboron and micro-carbon ferrochrome;

[0034] ② After adjusting the ingredients in front of the furnace, raise the temperature to 1620°C, add aluminum for deoxidation and alloying, and then release from the furnace;

[0035] ③ Wrap the pure cerium rare earth alloy with a thin steel sheet, and then press it into the furnace;

[0036] ④Then cast high boron cast steel castings with molds, the thickness of the castings is 30mm, and the pouring temperature of molten steel is 1510°C;

[0037] ⑤The high-boron cast steel is subjected to stress relief annealing treatment at 200°C, and the annealing holding time is 190min. The chemical composition of high boron cast steel is shown in Table 1, and the mechanical properties and liquid zinc corrosion performance of high boron cast stee...

Embodiment 2

[0043] Melting high-boron cast steel with a 150 kg intermediate frequency induction furnace, the preparation process steps are as follows:

[0044] ①First, mix and heat industrial pure iron, low-carbon ferroboron and micro-carbon ferrochrome;

[0045] ② After adjusting the ingredients before the furnace, the temperature is raised to 1591°C, adding aluminum for deoxidation and alloying, and then out of the furnace;

[0046] ③ Wrap the pure cerium rare earth alloy with a thin steel sheet, and then press it into the furnace;

[0047] ④Then cast high boron cast steel castings with molds, the thickness of the castings is 50mm, and the pouring temperature of molten steel is 1488°C;

[0048] ⑤The high-boron cast steel is subjected to stress relief annealing treatment at 190°C, and the annealing holding time is 240min. The chemical composition of high boron cast steel is shown in Table 3, and the mechanical properties and liquid zinc corrosion performance of high boron cast steel ar...

Embodiment 3

[0054] Melting high-boron cast steel with a 350 kg intermediate frequency induction furnace, the preparation process steps are as follows:

[0055] ①First, mix and heat industrial pure iron, low-carbon ferroboron and micro-carbon ferrochrome;

[0056] ② After adjusting the ingredients before the furnace, the temperature is raised to 1644°C, adding aluminum for deoxidation and alloying, and then out of the furnace;

[0057] ③ Wrap the pure cerium rare earth alloy with a thin steel sheet, and then press it into the furnace;

[0058] ④Then pour high boron cast steel castings with molds, the thickness of the castings is 60mm, and the pouring temperature of molten steel is 1495°C;

[0059] ⑤The high boron cast steel is subjected to stress relief annealing treatment at 210°C, and the annealing holding time is 280min. The chemical composition of high boron cast steel is shown in Table 5, and the mechanical properties and liquid zinc corrosion performance of high boron cast steel ar...

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Abstract

The invention discloses a high boron cast steel which resists the corrosion of molten zinc and a preparation method thereof, and the chemical compositions of the high boron cast steel are (weight percentage): C is less than 0.15, Si is less than 0.40, Mn is less than 0.40, B: 5.0-7.0, Ce: 0.05-0.15, Cr: 1.5-3.0, Al: 0.80-1.50, and the rest are Fe and unavoidable microimpurity. The high boron cast steel of the invention can be produced by an electric stove, wherein, the metallographic microstructure of the high boron cast steel consists of a reticular boride, a ferrite and a metallic matrix composed of a small quantity of pearlite; the molten zinc corrosion resistance of the high boron cast steel is excellent, and the corrosion velocity in the molten zinc of 500 DEG C is 25-40g / m <2> multiplied by h. Furthermore, the high boron cast steel is characterized by good obdurability, the intensity of tension more than 400MPa and an impact ductility more than 6J / cm <2>. The invention has the advantages that the cast steel does not rupture in operating process, and the service performance is significantly better than regular molten zinc corrosion resistant material; furthermore, the manufacturing process is simple, and the production cost is low for containing no expensive alloying elements. By adopting the molten zinc corrosion resistant high boron cast steel of the invention, the device operation efficiency can be significantly improved, the production cost can be reduced, and the economic and social benefits are good.

Description

technical field [0001] The invention relates to a liquid zinc corrosion-resistant material and a preparation method thereof, in particular to a high-boron cast steel resistant to liquid zinc corrosion and a preparation method thereof, belonging to the technical field of metal materials. Background technique [0002] Corrosion is very easy to occur in the use of steel materials. Corrosion of metals is a natural phenomenon in which materials undergo chemical reactions under the action of various environments, resulting in material performance degradation, state changes, and even damage and deterioration. According to the mechanism of action in the corrosion process, metal corrosion can be divided into four categories: chemical corrosion, electrochemical corrosion, corrosion under the action of mechanical factors, and biological corrosion. Corrosion not only affects the appearance of materials, but also directly affects the service life of equipment, components, vehicles, brid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C33/04C21D1/26
Inventor 符寒光蒋志强邢建东高义民成小乐宋绪丁
Owner XI AN JIAOTONG UNIV
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