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High temperature-resistant and acid corrosion-resistant stainless steel and preparation method thereof

A technology of acid corrosion resistance and stainless steel, applied in the field of stainless steel, can solve the problem that the corrosion rate cannot meet the requirements of corrosion resistance

Inactive Publication Date: 2010-09-29
DALIAN TENAI PUMP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen from the relevant literature that the above steel types are suitable for use under the condition of concentrated sulfuric acid at high temperature, but the corrosion rate cannot meet the corrosion resistance requirements under the working conditions of 50%-70% sulfuric acid and a temperature of 80-120°C

Method used

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  • High temperature-resistant and acid corrosion-resistant stainless steel and preparation method thereof
  • High temperature-resistant and acid corrosion-resistant stainless steel and preparation method thereof
  • High temperature-resistant and acid corrosion-resistant stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Use a non-vacuum intermediate frequency induction furnace to smelt stainless steel, and use sand molds or metal molds to cast. During the smelting process, the temperature is gradually raised to about 1600°C for 2.5 hours. After casting, the castings need to be kept in the cavity for 2 days, and samples are taken for testing. The composition of each element of stainless steel is shown in Table 2. Its acid corrosion resistance in 98% concentrated sulfuric acid and 93% concentrated sulfuric acid is shown in Table 3 and Table 4.

[0031] The composition of each element in the stainless steel of the present invention in table 2

[0032]

[0033] Table 3 Corrosion resistance of different types of stainless steel in 98% concentrated sulfuric acid

[0034]

[0035]

[0036] Table 4 Corrosion resistance of different types of stainless steel in 93% concentrated sulfuric acid

[0037]

[0038] It can be seen from the table that the corrosion resistance of the presen...

Embodiment 2

[0040] Use a non-vacuum intermediate frequency induction furnace to smelt stainless steel, and use sand or metal molds to cast. During the smelting process, the temperature is gradually raised to about 1650°C for 3 hours. After casting, the casting needs to be kept in the cavity for 3 days, and the sample piece is tested. The composition of each element of stainless steel is shown in Table 5. Its acid corrosion resistance in 60% concentrated sulfuric acid is shown in Table 6.

[0041] The composition of each element in the stainless steel of the present invention in table 5

[0042]

[0043] Table 6 Corrosion resistance of different types of stainless steel in 60% concentrated sulfuric acid

[0044]

[0045]

[0046] It can be seen from the table that the corrosion resistance of the present invention is superior to the level of related products at home and abroad, and can be applied in the medium of 60% concentrated sulfuric acid.

Embodiment 3

[0048] Stainless steel is smelted in a non-vacuum intermediate frequency induction furnace, and cast with sand or metal molds. During the smelting process, the temperature is gradually raised to about 1700°C for 2.8 hours. After casting, the castings need to be kept in the cavity for 4 days, and samples are taken for testing. The composition of each element of stainless steel is shown in Table 7. Its acid corrosion resistance in 60% concentrated sulfuric acid is shown in Table 8.

[0049] The composition of each element in the stainless steel of the present invention in table 7

[0050]

[0051]Table 8 Corrosion resistance of different types of stainless steel in 60% concentrated sulfuric acid

[0052]

[0053] It can be seen from the table that the corrosion resistance of the present invention is superior to the level of related products at home and abroad, and can be applied in the medium of 60% concentrated sulfuric acid.

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Abstract

The invention provides high temperature-resistant and acid corrosion-resistant stainless steel and a preparation method thereof. The stainless steel comprises the following components in percentage by weight: 0.001 to 0.04 percent of carbon, 2.0 to 9.0 percent of silicon, 0.001 to 0.03 percent of sulfur, 0.001 to 0.03 percent of phosphorus, 18.0 to 35.0 percent of chrome, 25.0 to 45.0 percent of nickel, 2.0 to 5.0 percent of molybdenum, 1.0 to 4.0 percent of copper, 0.5 to 1.0 percent of manganese, 0.2 to 0.5 percent of trace elements and the balance of iron. The preparation method for the stainless steel comprises the following steps of: smelting the components by using a medium-frequency induction coreless furnace; casting by using a sand mould or a metal mould; and preserving heat of the cast product in a cavity. The stainless steel material has resistance to oxidization and reduction in sulfuric acid media at different concentrations, and also has good rigidity and hot and cold workabilities.

Description

technical field [0001] The invention relates to acid corrosion resistant stainless steel, in particular provides a high temperature resistant acid corrosion resistant stainless steel and a preparation method thereof. Background technique [0002] As we all know, sulfuric acid is highly corrosive, and the corrosion process and influencing factors on metals are very complicated. The development of the sulfuric acid industry and its related industries put forward higher and higher requirements for stainless steel. [0003] Silicon (Si) is one of the main corrosion-resistant alloying elements and is used in stainless steel, low-alloy steel, nickel-based alloys and even cast iron. Silicon as an alloying element has the following advantages: It can improve the resistance of stainless steel to chloride stress corrosion cracking, pitting and crevice corrosion, and seawater corrosion; it can improve the resistance of stainless steel to strong oxidizing media (such as nitric acid, hi...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/46C22C33/04
Inventor 王诗毅李富岭吕海燕孙洪军武振海
Owner DALIAN TENAI PUMP
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