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1. (WO2018176905) HIGH-HARDNESS PRECISE ETCHING KNIFE DIE

Pub. No.:    WO/2018/176905    International Application No.:    PCT/CN2017/115356
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Sun Dec 10 00:59:59 CET 2017
IPC: C22C 38/02
C22C 38/58
C22C 38/48
C22C 38/50
C22C 38/42
C22C 38/06
C21D 9/00
C21D 6/00
B26F 1/44
Applicants: LIU, Hao
刘浩
Inventors: LIU, Hao
刘浩
Title: HIGH-HARDNESS PRECISE ETCHING KNIFE DIE
Abstract:
The invention provides a high-hardness precise etching knife die, including the following components by wt.%, C: 0.07-0.09%,Si: 0.33-0.35%,Mn: 1.5-1.7%,P: 0.01-0.03%,S: 0.001-0.003%,Nb: 0.015-0.017%,Ti: 0.023-0.025%,Ni: 0.3-0.5%,Cr: 0.7-0.9%,Cu: 0.2-0.4%,Al: 0.06-0.08%, the balance being Fe and impurities. The heat treatment process of the high hardness precision etching knife die includes the following steps: (1) heating the etching knife die to 750-770°C, maintaining the temperature for 15-17 min, air cooling for 10-13 min, heating to 650-670°C, compressing air to rapid cooling to 450-470 °C, and air cooling to room temperature; and (2) heating the etching knife die to 550-570°C, maintaining the temperature for 12-14 min, spraying water to cool to 370-390°C, heating to 610-630°C, water cooling to 310-330°C, and air cooling to room temperature.