US 11,718,902 B2
Rare earth die steel and preparation method thereof
Zhigang Wang, Ganzhou (CN); Liang Qi, Ganzhou (CN); Hebin Wang, Ganzhou (CN); Jieyun Ye, Ganzhou (CN); Weihao Cai, Ganzhou (CN); and Xuwei Liu, Ganzhou (CN)
Assigned to Jiangxi University of Science and Technology, Ganzhou (CN); and Guorui Scientific Innovation Rare Earth Functional, Ganzhou (CL)
Filed by Jiangxi University of Science and Technology, Ganzhou (CN); and Guorui Scientific Innovation Rare Earth Functional Materials (Ganzhou) Co., Ltd, Ganzhou (CN)
Filed on Feb. 14, 2022, as Appl. No. 17/671,147.
Claims priority of application No. 202111119239.7 (CN), filed on Sep. 24, 2021.
Prior Publication US 2023/0100153 A1, Mar. 30, 2023
Int. Cl. C22C 38/04 (2006.01); C22C 38/00 (2006.01); C21D 8/00 (2006.01)
CPC C22C 38/04 (2013.01) [C21D 8/005 (2013.01); C22C 38/005 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for preparing a rare earth die steel, comprising converter smelting, LF secondary refining, VD refining treatment, casting, electroslag remelting, homogenization treatment, hot forging, and heat treatment performed in sequence,
wherein the rare earth die steel comprises, by mass percentage, the following components: 0.36%-0.41% of C, 0.80%-1.10% of Si, 0.30%-0.50% of Mn, 4.90%-5.40% of Cr, 1.35%-1.55% of Mo, 0.8%-1.1% of V, 0.001%-0.005% of B, 0.006%-0.01% of Y, 0.001%-0.005% of Mg, no more than 0.003% of S, no more than 0.012% of P, no more than 0.0015% of O, less than 0.005% of H, and the balance of Fe, wherein 0.01%<Y+Mg<0.02%.