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Novel acid-resisting low alloy steel

A low-alloy steel and a new type of technology, applied in the field of alloy steel manufacturing, can solve the problem that low-alloy steel cannot be resistant to hydrochloric acid and sulfuric acid corrosion, and achieve the effect of improving hydrochloric acid resistance and wide application fields

Inactive Publication Date: 2015-11-04
GUODIAN SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The invention provides a new type of acid-resistant low-alloy steel that is resistant to hydrochloric acid corrosion and sulfuric acid corrosion and is reasonably priced to solve the defect that low-alloy steels in the prior art cannot resist hydrochloric acid and sulfuric acid corrosion

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Embodiment Construction

[0041] The purpose of the embodiments of the present invention is to provide a new acid-resistant low-alloy steel that can withstand hydrochloric acid dew point corrosion in flue gas treatment facilities, because it can withstand the characteristics of mixed acid substances containing chloride ions, the development of new acid-resistant low-alloy steel It has a wider application field than conventional sulfate-resistant steel.

[0042] The novel acid-resistant low-alloy steel of the embodiment of the present invention, the low-alloy steel contains by mass percent:

[0043] C: 0.01-0.14%;

[0044] Si: ≤0.55%;

[0045] Mn: ≤1.60%;

[0046] P:≤0.025%;

[0047] S:≤0.025%;

[0048] Cu: 0.25~0.50%;

[0049] Sb: ≤0.15%;

[0050] The remainder consists of Fe and unavoidable impurities.

[0051] figure 1 It is the corrosion rate diagram of the new acid-resistant low-alloy steel in the hydrochloric acid solution of the embodiment of the present invention; as shown in the figure,...

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Abstract

The invention provides novel acid-resisting low alloy steel. The novel acid-resisting low alloy steel comprises, by mass, 0.01%-0.14% of C, Si smaller than or equal to 0.55%, Mn smaller than or equal to 1.60%, P smaller than or equal to 0.025%, S smaller than or equal to 0.025%, 0.25%-0.50% of Cu, Sb smaller than or equal to 0.15% and the balance Fe and inevitable impurities. Compared with conventional acid-resisting low alloy steel, the hydrochloric acid resisting performance of the acid-resisting low alloy steel is remarkably improved, and the sulfuric acid resisting performance of the acid-resisting low alloy steel is equal to that of the conventional acid-resisting low alloy steel. In addition, the alloy mechanical performance and weldability of the novel acid-resisting low alloy steel are as good as those of the conventional acid-resisting low alloy steel, and the application field is wider than that of the conventional sulfuric-acid-resisting steel.

Description

technical field [0001] The invention relates to material forming technology, in particular to a novel acid-resistant low-alloy steel, which belongs to the technical field of alloy steel manufacturing. Background technique [0002] Flue gas dew point corrosion is due to the formation of SO in the combustion of sulfur in fuel 2 , SO 3 , when the temperature of the outer surface of the heat exchange surface is lower than the flue gas dew point temperature, sulfuric acid mist and dewdrops will be formed on the heat exchange surface, resulting in corrosion of the heat exchange surface. There are two main methods to reduce low-temperature dew point corrosion. The wall temperature of the pipe wall or heating element can be higher than the dew point to avoid dewdrops; or corrosion-resistant materials can be used to avoid corrosion. [0003] At present, the main problems of acid-resistant alloy steel are: [0004] 1. Insufficient anti-corrosion performance [0005] Acid dew point...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/16
Inventor 申智勇张建东李志强舒喜
Owner GUODIAN SCI & TECH RES INST