EP 4338862 A1 20240320 - METHOD FOR ROLLING HIGH-TOUGHNESS HIGH-STRENGTH LOW-ALLOY STEEL
Title (en)
METHOD FOR ROLLING HIGH-TOUGHNESS HIGH-STRENGTH LOW-ALLOY STEEL
Title (de)
VERFAHREN ZUM WALZEN VON HOCHFESTEM, NIEDRIGLEGIERTEM STAHL MIT HOHER ZÄHIGKEIT
Title (fr)
PROCÉDÉ DE LAMINAGE D'ACIER FAIBLEMENT ALLIÉ À HAUTE RÉSISTANCE ET HAUTE TÉNACITÉ
Publication
Application
Priority
- CN 202110519204 A 20210512
- CN 2022092306 W 20220511
Abstract (en)
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.
IPC 8 full level
B21B 1/18 (2006.01); C22C 38/02 (2006.01)
CPC (source: CN EP KR)
B21B 37/76 (2013.01 - KR); B21B 45/0203 (2013.01 - KR); C21D 1/60 (2013.01 - EP); C21D 7/13 (2013.01 - EP); C21D 8/0226 (2013.01 - CN); C21D 8/065 (2013.01 - EP); C21D 9/0062 (2013.01 - KR); C21D 9/0075 (2013.01 - EP); C22C 38/001 (2013.01 - KR); C22C 38/02 (2013.01 - CN EP); C22C 38/04 (2013.01 - CN EP); C22C 38/06 (2013.01 - CN KR); C22C 38/12 (2013.01 - CN EP); C22C 38/24 (2013.01 - CN KR); C22C 38/38 (2013.01 - CN EP KR); C21D 2211/005 (2013.01 - CN EP); C21D 2211/009 (2013.01 - CN EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4338862 A1 20240320; CN 113215492 A 20210806; CN 113215492 B 20220408; JP 2024518471 A 20240501; KR 20240004507 A 20240111; WO 2022214107 A1 20221013
DOCDB simple family (application)
EP 22784173 A 20220511; CN 202110519204 A 20210512; CN 2022092306 W 20220511; JP 2023569599 A 20220511; KR 20237038961 A 20220511