公开(公告)号：US20210363603A1

公开(公告)日：2021-11-25

申请号：US17021404

申请日：2020-09-15

Applicant: University of Science and Technology Beijing

Inventor： Jinfeng HUANG ,  Jin ZHANG ,  Cheng ZHANG ,  Chao ZHAO ,  Yong LIAN ,  Jianqiang LI ,  Cheng ZHANG

IPC: C21D9/00 ,  C21D8/00 ,  C21D6/00 ,  C21D1/28 ,  C22C1/02 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B22C9/06 ,  B21D37/10

Abstract: The present application provides a hot-work die steel and a preparation method thereof, wherein the chemical constituents of the hot-work die steel in mass percentage are as follows: C: 0.20-0.32 wt %, Si: ≤0.5 wt %, Mn: ≤0.5 wt %, Cr: 1.5-2.8 wt %, Mo: 1.5-2.5 wt %, W: 0.5-1.2 wt %, Ni: 0.5-1.6 wt %, V: 0.15-0.7 wt %, Nb: 0.01-0.1 wt %, and a balance of iron, wherein an alloying degree is 5-7%; a tensile strength of the hot-work die steel at 700° C. is 560-700 MPa; a value of hardness of the hot-work die steel at room temperature is 32-38 HRC after holding at 700° C. for 3-5 h; and the hot-work die steel has an elongation of 14% to 16% at room temperature, a percentage reduction of area of 48% to 65%, and an impact toughness of 52-63 J at room temperature. The hot-work die steel of the present application has an excellent thermal stability as well as a good plasticity and a toughness at room temperature.