US 12,371,767 B2
Hot-working die steel, heat treatment method thereof and hot-working die
Hongliang Yi, Liaoning (CN); Lianqian Liu, Liaoning (CN); Guodong Wang, Liaoning (CN); and Xiaochuan Xiong, Jiangsu (CN)
Assigned to Ironovation Materials Technology Co., Ltd., Jiangsu (CN)
Appl. No. 17/435,067
Filed by IRONOVATION MATERIALS TECHNOLOGY CO., LTD., Jiangsu (CN)
PCT Filed Oct. 18, 2019, PCT No. PCT/CN2019/111849
§ 371(c)(1), (2) Date Aug. 31, 2021,
PCT Pub. No. WO2020/177325, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 201910156108.2 (CN), filed on Mar. 1, 2019.
Prior Publication US 2022/0162731 A1, May 26, 2022
Int. Cl. C22C 38/48 (2006.01); C21D 8/00 (2006.01); C21D 9/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01)
CPC C22C 38/48 (2013.01) [C21D 8/005 (2013.01); C21D 9/0068 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A hot-working die steel, wherein an alloying composition by weight percentage comprises Cu: 5.03˜8%, Ni: 0.8˜6%, and Ni:Cu≥0.4, C: 0˜0.198%, Mo: 0˜3%, W: 0˜3%, Nb: 0˜0.2%, Mn: 0˜0.8%, Cr: 0˜1%, Al: 0˜3%, the balance of Fe and impurities, and
wherein a hardness of the hot-working die steel is ≥HRC 50.1.