EP 4227431 A1 20230816 - V-N MICROALLOYED STEEL AND METHOD FOR PRODUCING V-N MICROALLOYED AND SURFACE-CRACK-FREE CONTINUOUS CASTING BLANK
Title (en)
V-N MICROALLOYED STEEL AND METHOD FOR PRODUCING V-N MICROALLOYED AND SURFACE-CRACK-FREE CONTINUOUS CASTING BLANK
Title (de)
V-N-MIKROLEGIERTER STAHL UND VERFAHREN ZUR HERSTELLUNG EINES V-N-MIKROLEGIERTEN UND RISSFREIEN STRANGGUSSROHLINGS
Title (fr)
ACIER MICROALLIÉ EN V-N ET PROCÉDÉ DE PRODUCTION D'UNE ÉBAUCHE DE COULÉE CONTINUE MICROALLIÉE EN V-N ET SANS FISSURE DE SURFACE
Publication
Application
Priority
- CN 202010990234 A 20200918
- CN 2021118337 W 20210914
Abstract (en)
Disclosed are a V-N microalloyed steel and a method for producing a V-N microalloyed and surface-crack-free continuous casting blank. The V-N microalloyed steel is composed of the following chemical components by mass percentage: 0.09%-0.13% of C, 0.1%-0.4% of Si, 1.0%-3.0% of Mn, less than or equal to 0.05% of P, less than or equal to 0.05% of S, 0.1%-0.4% of V, 0.011%-0.2% of N and the balance of Fe and unavoidable impurity elements. A continuous casting blank is subjected to component control according to the chemical components of the V-N microalloyed steel; and the production method therefor comprises converter smelting, LF refining and continuous casting steps in sequence. According to the present invention, by means of reasonable component design and smelting and continuous casting processes, the thermoplasticity of the continuous casting blank is improved, so that a high-temperature brittle region is prevented in a casting blank straightening region of the continuous casting blank or the thermoplasticity is good enough such that no surface crack appears, the casting blank is good in terms of surface quality and does not need to be cleaned, and the production efficiency is improved.
IPC 8 full level
C22C 38/12 (2006.01); B22D 11/22 (2006.01); C21C 5/30 (2006.01); C21C 7/06 (2006.01); C21C 7/072 (2006.01)
CPC (source: CN EP)
B22D 11/001 (2013.01 - EP); B22D 11/22 (2013.01 - CN); B22D 11/225 (2013.01 - EP); C21C 5/30 (2013.01 - CN); C21C 7/06 (2013.01 - CN); C21C 7/072 (2013.01 - CN); C22C 38/001 (2013.01 - CN EP); C22C 38/02 (2013.01 - CN EP); C22C 38/04 (2013.01 - CN EP); C22C 38/12 (2013.01 - CN EP); C21C 7/06 (2013.01 - EP); C21C 7/072 (2013.01 - EP)
Citation (search report)
See references of WO 2022017545A1
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 4227431 A1 20230816; CN 111996466 A 20201127; CN 111996466 B 20210917; WO 2022017545 A1 20220127
DOCDB simple family (application)
EP 21847037 A 20210914; CN 202010990234 A 20200918; CN 2021118337 W 20210914