Manufacturing method of sulfuric acid liquid corrosion resistant fin steel belt for spiral fin heat exchanger

By designing and controlling the composition in the cold-rolled steel strip for rotary fin heat exchanger, the problem of insufficient performance of the steel strip in the corrosion environment of sulfuric acid liquid and interrupting the belt during winding process is solved, and the effect of high corrosion resistance and stable winding is achieved.

CN119685680APending Publication Date: 2025-03-25SHANGHAI MEISHAN IRON & STEEL CO LTD
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Patent Information

Application Number
CN202311242790.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-25
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The existing cold-rolled fin steel strips for rotary fin heat exchangers are insufficient in the corrosion-resistant environment of sulfuric acid liquids, and the belt is easily broken during winding, making it difficult to ensure the good shape of the fins.

Method used

Chemically specific cold rolled steel strips are prepared through appropriate component design, hot rolling and cold rolling and annealing process control, ensuring that they have good performance in corrosion resistance to acid media and reducing the risk of breaking during winding.

Benefits of technology

The cold-rolled steel strip for rotary fin heat exchanger is achieved with high corrosion resistance in the sulfuric acid liquid corrosion environment, avoiding the problem of strip breakage during winding and reducing manufacturing costs.

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Abstract

The invention relates to a manufacturing method of a sulfuric acid liquid corrosion resistant fin steel strip for a spiral fin heat exchanger. The fin steel strip comprises the following chemical components in percentage by weight: 0.03 to 0.10 percent of C, 0.005 to 0.035 percent of Si, 0.40 to 0.80 percent of Mn, less than or equal to 0.018 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.0050 percent of N, 0.010 to 0.055 percent of Al, 0.010 to 0.03 percent of Ti, 0.20 to 0.40 percent of Cu, 0.70 to 1.10 percent of Cr, 0.06 to 0.12 percent of Sb and the balance of iron and inevitable impurities. According to the produced steel belt for the cold-rolled fin, the problem of insufficient sulfuric acid liquid corrosion resistance can be solved only by adding a small amount of Cu, Cr and Sb elements, a large amount of Cr and Ni stainless steel alloy elements do not need to be added, and the manufacturing cost of the steel for the fin can be remarkably reduced. And the method has remarkable economical efficiency.
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