张锦文, 王文先, 邬中华, et al. Improvement on Quality of Rolled Billet of EAF-LF-VD-CC Steelmaking High-Speed Railway Axle Steel DZ2 by Argon Shielding ESR[J]. Special Steel, 2021, 42(4): 25-29.
张锦文, 王文先, 邬中华, et al. Improvement on Quality of Rolled Billet of EAF-LF-VD-CC Steelmaking High-Speed Railway Axle Steel DZ2 by Argon Shielding ESR[J]. Special Steel, 2021, 42(4): 25-29.DOI:
The 250 mm x 250 mm rolled billets of high-speed railway axle steel DZ2 are rolled
by EAF-LF-VD-ϕ690 mm cast bloom and EAF-LF-VD-ϕ690 mm cast bloom-ϕ740 mm ESR ingot of two processes. The macrostructure
inclusions
carbon segregation
microstructure and mechanical properties of the blooms are studied. The results show that: compared with EAF process flowsheet
the rating of central porosity and general porosity of DZ2 steel shaft billet obtained by ESR process reduces from 0.5 ~ 1.0 to 0 ~ 0.5 grade; the size range of inclusions reduces from 2.43 ~ 25. 05μm to 1. 42 ~ 9. 32μm
and the morphology of inclusion changes from rod-shaped to spherical; the carbon content distribution on cross-section reduces from 0.256% ~ 0.269% to 0.261 % ~ 0.265%
and the carbon range difference reduces from 0.013% to 0.004% ; the yield strength and tensile strength increase by 17.5% and 13.8%
respectively
and the transverse and longitudinal impact energy at 20℃. increase by 36.2% and 17.8%