Patent ID: 11959158
Assignee: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A hot-work die steel, wherein the hot-work die steel consists of following components by mass:
C: 0.15-0.16%,
Si: 0.40-0.90%,
Mn: 0.2-0.8%,
Cr: 1.50-2.40%,
Ni: 4.20-4.50%,
Mo: 1.00-1.60%,
V: 0.10-0.40%,
W: 0.20-0.90%,
P: ≤0.02%,
S≤0.02%, and
at least one of Co: 0.10-0.50% and Re: 0.01-0.05%, and
a balance of Fe matrix and other inevitable impurities, and
optionally 0.01-0.03% Zr, or 0.01-0.05 Nb by mass,
wherein the structure of the hot-work die steel is lath martensite/sorbite and does not comprise acicular martensites, and
wherein the hot work die steel has a V notch impact energy of 28 J or more than 28 J at −40° C. according to HB 5278-1984, a high temperature strength of 380 MPa or more at 700° C. according to GB/T4338-2006, and a Rockwell hardness HRC of 48.5-52 according to ASTM A255-02.