Quenching process of Q1300E ultra high strength steel for construction machinery

doi:10.13251/j.issn.0254-6051.2022.12.021

Abstract

Abstract: Mechanical properties and microstructure of Q1300E steel plate under different quenching processes were studied by means of automatic tensile testing machine, automatic impact testing machine, metallographic microscope and scanning electron microscope. The results show that when the quenching heating time is 60 min and the quenching temperature is 840 ℃, the strength and low-temperature impact property are the best, and the mechanical properties in tempered state meet the GB/T 28909—2012 standard requirements. The yield strength is 1302 MPa, the tensile strength is 1505 MPa, and the longitudinal and transverse impact absorbed energy at -40 ℃ are 74 J and 61 J, respectively. When the quenching temperature is 870, 900 and 930 ℃, the tensile strength and low-temperature impact absorbed energy meet the GB/T 28909—2012 standard requirements, but the yield strength is lower than 1300 MPa. The change of quenching temperature has obvious influence on grain size. When the quenching temperature is 840 ℃, the average grain size is the smallest,which is 5.7 μm. When quenching temperature is 930 ℃, the average grain size is 15.9 μm. The influence of quenching heating time on mechanical properties and grain size is relatively small. When the quenching temperature is 840 ℃ and the quenching heating time is 40-80 min, the mechanical properties in the tempered state meet the GB/T 28909—2012 standard requirements, and the grain size is 4.5-6.5 μm.

Key words: construction machinery, ultra high strength steel, quenching process, mechanical properties, microstructure

CLC Number:

TG142.1

Zhang Qingxue, Zhou Wenhao, Liu Dan, Zhang Yongwei, Zheng Dongsheng, Li Hongying. Quenching process of Q1300E ultra high strength steel for construction machinery[J]. Heat Treatment of Metals, 2022, 47(12): 120-125.

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