HIGH-STRENGTH STAINLESS STEEL, HEAT TREATMENT PROCESS AND FORMED COMPONENT

WIPO Patent Application WO/2020/098448

A1

Disclosed are a high-strength stainless steel, a heat treatment process and a formed component. The high-strength stainless steel comprises the following in parts by weight: 0.2-0.35% of C, 0.7-3.50% of Mn, 0.6-2.0% of Si, 11-17% of Cr, 0.20% or less of Nb, 0.20% or less of Ti, the balance being Fe and impurities. The heat treatment process comprises the following steps: step a of heating the high-strength stainless steel to 1000-1200ºC for 1-3600s; step b of cooling the high-strength stainless steel having been treated in step a to below 100ºC; and step c of heating the high-strength stainless steel having been treated in step b to 150-400ºC for 10-10000s, followed by cooling to room temperature by any cooling means. The formed component is prepared from the high-strength stainless steel. The microstructure of the formed component comprises, by area, 5% to 30% of retained austenite, 70% to 95% of martensite, less than 1% of Nb and Ti carbide, and less than 2% of Cr carbide.

YI HONGLIANG (CN)
DENG BIAO (CN)
WANG GUODONG (CN)
XIONG XIAOCHUAN (CN)

PCT/CN2019/111884

May 22, 2020

October 18, 2019

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IRONOVATION MATERIALS TECH CO LTD (CN)

C22C38/02; C21D6/00; C22C38/04; C22C38/18; C22C38/20; C22C38/22; C22C38/24; C22C38/26; C22C38/28; C22C38/34; C22C38/38; C22C38/40; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/50; C22C38/58

CN109594022A	2019-04-09
CN107849669A	2018-03-27
CN103805857A	2014-05-21
CN102162066A	2011-08-24
CN105934530A	2016-09-07
US20060065327A1	2006-03-30

CHINA PATENT AGENT (H.K.) LTD. (CN)

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