Low yield ratio control strategy for thin 12MnNiVR storage tank steel plate

doi:10.13251/j.issn.0254-6051.2022.06.033

Abstract

Abstract: Effect of microstructure of quenched and tempered 12MnNiVR storage tank steel with different specifications on the yield ratio was analyzed by means of mechanical property test and microstructure observation with optical microscope and transmission electron microscopy. The test results show that the main microstructure of 12MnNiVR steel plate after quenching is martensite and part of acicular ferrite/bainitic ferrite, and the volume fraction of acicular ferrite in 18 mm thin steel plate is 10%-15%, while that in 33.5 mm heavy steel plate can reach more than 40%. By optimizing the quenching cooling rate, quenching temperature, tempering temperature and other process parameters for the thin steel plate, the volume fraction of acicular ferrite in the structure can be increased, so that the yield ratio of the thin steel plate can be reduced.

Key words: 12MnNiVR steel plate, thin plate, yield ratio, quenching, tempering, acicular ferrite

CLC Number:

TG142.4

Zhang Yuefei, Wang Kun, Zhang Xuefeng, Zou Yang, Du Qunchao. Low yield ratio control strategy for thin 12MnNiVR storage tank steel plate[J]. Heat Treatment of Metals, 2022, 47(6): 173-177.

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