Comparison on the Compositions, Microstructure and Hardness of Super Large Section Prehardened Steels for Plastic Mould Block

Yi Luo; Jun Wu; Xiao Chun Wu; Yong’an Min; Hong Bin Wang

doi:10.4028/www.scientific.net/AMR.476-478.430

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 476-478Comparison on the Compositions, Microstructure and...

Comparison on the Compositions, Microstructure and Hardness of Super Large Section Prehardened Steels for Plastic Mould Block

Abstract:

Compositions and hardness of four prehardened steels for plastic mould blocks with more than 1 m thick, named QTPA, QTPB, QTPC and QTPD were tested, and microstructures at center and surface of blocks were observed. The results show that hardness uniformity of the QTPC steel block is less than ± 4 HRC, its center appears pearlite, while microstructures at center of the other three steel blocks are martensite and bainite, hardness uniformity of the QTPA steel is less than ±1 HRC, hardness uniformity of the QTPB and QTPD steels are less than ±2 HRC. Combined with the compositions analysis, molybdenum has bigger effect on the hardenablity and hardness uniformity of the large section prehardened steels for plastic mould block, and QTPC steel with higher carbon and lower Molybdenum content makes the hardness uniformity be less than the others.

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Periodical:

Advanced Materials Research (Volumes 476-478)

Pages:

430-433

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.476-478.430

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Online since:

February 2012

Authors:

Yi Luo, Jun Wu, Xiao Chun Wu, Yong’an Min, Hong Bin Wang

Keywords:

Composition, Hardness, Microstructure, Plastic Mould Steel, Super Large Section Block

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