Title:
METHOD FOR MANUFACTURING FERRITIC LIGHTWEIGHT STEEL AND FERRITIC LIGHTWEIGHT STEEL USING SAME
Document Type and Number:
WIPO Patent Application WO/2022/124601
Kind Code:
A1
Abstract:
The present invention relates to a method for manufacturing ferritic lightweight steel and ferritic lightweight steel using same and, more specifically, to a method for manufacturing ferritic lightweight steel, which maximizes the structural stability by performing low-temperature tempering for a short period of time, and improves strength while reducing the amount of manganese added. The method for manufacturing ferritic lightweight steel, according to the present invention, is performed by: a first step of subjecting an alloy to solution treatment at 1,200 °C for 90 minutes; a second step of hot-rolling the alloy having undergone solution treatment, at 900-1,100 °C; a third step of rolling the hot-rolled alloy at 650 °C for 60 minutes; a third step of air-cooling the hot-rolled alloy at room temperature at a cooling rate of 10 °C/s; a fourth step of cold-rolling the air-cooled alloy at room temperature until the thickness is reduced by 70%; a fifth step of intercritically annealing the cold-rolled alloy at 850-950 °C for 90 seconds; a sixth step of cooling the intercritically annealed alloy at a cooling rate of -10 °C/s; a seventh step of isothermally annealing the cooled alloy at 430 °C for 50 seconds; an eighth step of air-cooling the isothermally annealed alloy; and a ninth step of subjecting the air-cooled alloy to low-temperature tempering-induced partitioning (LTP) at 300 °C for 10 minutes. The lightweight steel contains the components of 2.0-3.0 wt% of Mn, 5.0-6.0 wt% of Al, and 0.1-0.3 wt% of C.
Inventors:
SEOL JAE BOK (KR)
BAE HYO JU (KR)
KOH KWANG GYU (KR)
KIM JUNG GI (KR)
SUNG HYO KYUNG (KR)
BAE HYO JU (KR)
KOH KWANG GYU (KR)
KIM JUNG GI (KR)
SUNG HYO KYUNG (KR)
Application Number:
PCT/KR2021/016379
Publication Date:
June 16, 2022
Filing Date:
November 11, 2021
Export Citation:
Assignee:
NAT UNIV GYEONGSANG IACF (KR)
International Classes:
C22C38/04; C21D8/02; C22C38/06
Foreign References:
| KR20180126070A | 2018-11-26 | |||
| KR101289902B1 | 2013-07-24 | |||
| KR20180126580A | 2018-11-27 | |||
| KR20110104118A | 2011-09-21 | |||
| KR102319479B1 | 2021-10-29 |
Attorney, Agent or Firm:
KIM, Jong Seok (KR)
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