Title:
METHOD FOR ROLLING HIGH-TOUGHNESS HIGH-STRENGTH LOW-ALLOY STEEL
Document Type and Number:
WIPO Patent Application WO/2022/214107
Kind Code:
A1
Abstract:
The method for rolling a high-toughness high-strength low-alloy steel, sequentially comprising the following steps: heating, descaling, rough rolling, continuous rolling, first water cooling, finish rolling, second water cooling, and cold hearth cooling; and using a converter continuous casting billet as a raw material, the continuous casting billet comprising the following chemical components in percentage by mass: C≤0.20, Si≤0.60, Mn: 1.00-1.70, Cr≤0.30, P≤0.020, S≤0.020, V: 0.05-0.10, Al≤0.03, and N≤0.025, with the balance being Fe and inevitable impurities. By using the rolling method, the actual grain size of the high-strength low-alloy steel can be refined; the comprehensive performance of the high-strength low-alloy steel is excellent; the metallographic structure is fine ferrite and pearlite; the grain size reaches 9.0 or above; the impact energy at -20°C is greater than 100 J, and the impact energy at -40°C is greater than 80 J.
Inventors:
LI XIAOLONG (CN)
SHI TAO (CN)
ZHOU DUNSHI (CN)
SHI TAO (CN)
ZHOU DUNSHI (CN)
Application Number:
PCT/CN2022/092306
Publication Date:
October 13, 2022
Filing Date:
May 11, 2022
Export Citation:
Assignee:
DAYE SPECIAL STEEL CO LTD (CN)
International Classes:
B21B1/18; C22C38/02
Foreign References:
| CN113215492A | 2021-08-06 | |||
| JPH11158543A | 1999-06-15 | |||
| CN106086353A | 2016-11-09 | |||
| US20150007913A1 | 2015-01-08 | |||
| CN111570537A | 2020-08-25 | |||
| CN103911549A | 2014-07-09 | |||
| CN112080687A | 2020-12-15 | |||
| CN108906884A | 2018-11-30 |
Attorney, Agent or Firm:
BEIJING WUZHOUYANGHE & PARTNERS (CN)
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