Flexible manufacturing technology of controlling exact bake hardening value in continuous galvanizing line

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Abstract Flexible manufacturing technology for ultra-low-carbon bake hardening (BH) steels with different solute carbon contents in the range of (6–16) × 10-4 wt.% was systematically studied. The effects of soaking temperature, cooling rate and aging time on solute carbon content were explored. The bake hardening value in a continuous galvanizing line with an over-aging section was investigated. Optimal manufacturing parameters were calculated using the design of experiment to obtain the best and most flexible process parameters. Results indicate a relationship among carbon content, soaking temperature and cooling rate. When solute carbon is 9 × 10-6, cooling rate is 50 °C/s, the soaking temperature is 745 °C, and BH value is 45 MPa, the requirements of an automobile factory can be met.

Key words： bake hardening (BH) value solute carbon content aging time soaking temperature cooling rate

Received: 18 September 2017 Published: 23 January 2019

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	ZHENG Xiao-Fei

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ZHENG Xiao-Fei. Flexible manufacturing technology of controlling exact bake hardening value in continuous galvanizing line[J]. Journal of Iron and Steel Research International, 2018, 25(12): 1296-1302.

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