Teshugang (May 2024)
Forming Process and Analysis of 436L Ferritic Stainless Steel Heat Exchanger Plate
Abstract
In order to resolve the cracking problem of 436L ferritic stainless steel heat exchanger plates during stamping ， the forming characteristics of two typical corrugated structure heat exchange plate were studied through Dynaform numerical simulation analysis and stamping forming experiments， the evolution of forming limit and thinning rate during the forming process was analyzed， and the influence of plate thickness and corrugation parameters （corrugation pitch） on crack location and degree of cracking was studied. Additionally， the impact of corrugation pitch on thinning rate was also discussed. The results indicate that the cracking and thinning of 436L ferritic stainless steel heat exchanger plates are both affected by plate thickness and corrugation parameters. For shallow corrugated heat exchanger plates （corrugation depth of 2 mm）， the vulnerable area for cracking is the top of the corrugation’s rounded corner. Increasing the plate thickness sig⁃ nificantly affects the tendency for cracking and thinning rate， with a decrease of approximately 2. 6% in the maximum thin⁃ ning rate at the rounded corner for every 0. 1 mm increase in plate thickness. At this point， the maximum safe thinning rate for forming is 18. 9%， and the minimum forming plate thickness is 0. 6 mm. For deep corrugated heat exchanger plates （corrugation depth of 2. 6 mm）， the vulnerable areas for cracking are the sides of the corrugation’s rounded corner and the top of the rounded corner. Increasing the plate thickness has a smaller impact on the tendency for cracking and thinning rate， with only a decrease of approximately 1. 4% in the maximum thinning rate at the rounded corner for every 0. 1 mm increase in plate thickness. To ensure that the quality requirements for forming are met， it is necessary to increase the normal pitch of the corrugation.
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