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A kind of corrosion-resistant steel resistant to hydrochloric acid corrosion and preparation method thereof

A corrosion-resistant steel and hydrochloric acid-resistant technology, which is applied in the field of metal alloys, can solve the problems of increasing the production cost of Roots water vapor compressors and wet Roots vacuum pumps, the corrosion resistance of imported material castings is not very ideal, and the life of parts is shortened. , to achieve the effect of reducing electrochemical corrosion potential difference, improving mechanical properties and reducing cathode activity

Active Publication Date: 2021-02-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: the supporting Roots vacuum pump required in the pressure swing adsorption oxygen production industry, and the Roots blower for transporting water gas and semi-water gas in the chemical and fertilizer industries, the machine is faced with a large amount of water vapor washing and water in the phase change during the entire operation process. The cavitation phenomenon formed on the machine parts during the process will greatly shorten the life of the parts, so that the rotor or the whole machine must be replaced frequently
At present, castings made of imported materials lead to high cost of castings (about 50,000 yuan / ton), and the corrosion resistance of imported materials castings is still not very satisfactory
This greatly increases the production cost of Roots water vapor compressor and wet Roots vacuum pump

Method used

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  • A kind of corrosion-resistant steel resistant to hydrochloric acid corrosion and preparation method thereof
  • A kind of corrosion-resistant steel resistant to hydrochloric acid corrosion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The corrosion-resistant cast steel of this embodiment is composed of the following components: C≤0.1%, Cr13%, Mo3%, Sn0.3%, Sb0.3%, Cu 0.4%, Nb≤0.2, Ti≤0.1%, and the balance is Fe .

[0039] Test casting properties:

[0040] The casting obtained in 1% HCl solution had a 15d weight loss ratio of 0.05%; prolonging the corrosion time in 1% HCl, it was found that the weight loss ratio was basically unchanged, indicating that the casting had formed a dense oxide film in 1% HCl solution, which has an important role in corrosion resistance. Sexual enhancement is beneficial. Under the same conditions, the weight loss ratio of 304 stainless steel in 1% HCl is 0.4%.

[0041] The yield strength of the casting is 322MPa, the tensile strength is 334MPa, and the hardness is 164-169HBW.

Embodiment 2

[0043] The corrosion-resistant cast steel of this embodiment is composed of the following components: C≤0.1%, Cr13%, Mo3%, Sn0.6%, Cu0.4%, Nb≤0.2, Ti≤0.1%, Si≤0.4%, Mn≤0.2 %, the balance is Fe.

[0044] Test casting properties:

[0045] The obtained casting is in 1% HCl solution, and the 15d weight loss ratio is 0.02%.

Embodiment 3

[0047] The corrosion-resistant cast steel of this embodiment is composed of the following components: C≤0.1%, Cr13%, Mo3%, Sn0.6%, Cu0.4%, Nb≤0.2, Ti≤0.1%, Si≤0.4%, Mn≤0.2 %, the balance is Fe.

[0048] Test casting properties:

[0049] The obtained casting has a weight loss ratio of 0.003% in 15d in 1% NaCl solution.

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Abstract

The invention discloses hydrochloric acid corrosion-resistant corrosion-resistant steel. The steel comprises the following components of, by weight, 12.00-15.00 of Cr, 2.00-4.00 of Mo, 0.25-0.65 of Sn, 0.30-0.50 of Cu, 0.10-0.40 of Sb, 0.15-0.25 of Nb, 0.05-0.15 of Ti, less than or equal to 0.15 of C and the balance Fe. A casting is obtained after smelting, and in a 1% HCl solution, the weight loss ratio for 15 days is less than or equal to 0.05%. According to the steel, by properly adjusting content of the alloy elements, the elements Mo, Sb, Cu and the like which facilitate improvement of the corrosion resistance in hydrochloric acid are added, sand casting and heat treatment are carried out, so that the corrosion-resistant steel suitable for working the corrosion condition of acid mistcontaining plasma of Cl<->, SO4<2->, NH4<+> and the like is prepared, the steel has good corrosion resistance in low-concentration hydrochloric acid, and has excellent corrosion resistance in NaCl, NH4Cl and NaSo4<2->, the problem that a wallboard and a side plate of a Roots blower are subjected to acid mist corrosion of plasma of Cl<->, SO4<2->, NH4<+> and the like can be solved, and meanwhile, the steel can be applied to other marine corrosion-resistant workpieces.

Description

technical field [0001] The invention relates to the technical field of metal alloys, in particular to a hydrochloric acid corrosion-resistant corrosion-resistant steel and a preparation method thereof. Background technique [0002] In recent years, with the vigorous development of petroleum, chemical, pharmaceutical, clean energy and other industries in the country, the medium environment in which materials and equipment are located has become more and more complex, and higher and higher requirements have been put forward for the corrosion resistance of engineering materials. In engineering design, it is often possible to encounter working conditions in which hydrochloric acid is used as the reaction medium. In hydrochloric acid medium, most commonly used metals and alloys are difficult to resist his corrosion. When air and oxidant exist in the hydrochloric acid medium at the same time, the corrosion conditions become extremely harsh and the corrosion phenomenon is more ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C22C38/20C22C38/60C22C38/26C22C38/28C22C33/06
CPCC22C33/06C22C38/008C22C38/20C22C38/22C22C38/26C22C38/28C22C38/60
Inventor 姜锋叶鹏程陈基良汪冰峰洪霞
Owner CENT SOUTH UNIV
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