EP 4074858 A1 20221019 - HOT-ROLLED H-BEAM STEEL BASED ON SPECIAL-SHAPED BILLET ROLLING AND FORMING, AND MANUFACTURING METHOD THEREFOR
Title (en)
HOT-ROLLED H-BEAM STEEL BASED ON SPECIAL-SHAPED BILLET ROLLING AND FORMING, AND MANUFACTURING METHOD THEREFOR
Title (de)
WARMGEWALZTER H-TRÄGERSTAHL BASIEREND AUF SPEZIALGEFORMTEM KNÜPPELWALZEN UND UMFORMEN, UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER POUR POUTRE-H LAMINÉ À CHAUD BASÉ SUR LE LAMINAGE ET LE FORMAGE DE BILLETTES DE FORME SPÉCIALE, ET PROCÉDÉ DE FABRICATION ASSOCIÉ
Publication
Application
Priority
- CN 201911250138 A 20191209
- CN 2020134563 W 20201208
Abstract (en)
Disclosed in the present invention is a manufacturing method for hot-rolled H-beam steel based on special-shaped billet rolling and forming. The H-beam steel comprises the chemical components in percentage by weight: C: 0.04-0.08; Si: ≤ 0.25; Mn: 1.25-1.45; V: 0.04-0.10; Ni: 0.2-1.0; P ≤ 0.02; S ≤ 0.01; Nb: 0.02-0.06, Al: 0.02-0.06; N ≤ 0.015; O ≤ 0.005; with the balance being Fe and inevitable impurities. The H-beam steel has the yield strength of the upper and lower flanges being greater than or equal to 420 MPa; the -40°C transverse impact energy being greater than or equal to 34 J, and the -60°C longitudinal impact energy being greater than or equal to 120 J. The manufacturing method for the H-beam steel comprises the following steps: 1) a smelting and continuous casting process: smelting using a converter, LF refining, and casting into a special-shaped continuous casting billet; and 2) a rolling process: heating; rolling; and cooling after the rolling. The low temperature-resistant H-beam steel product for marine engineering provided in the present invention has good mechanical properties, is easy to industrially manufacture, reduces the requirements for rolling equipment; and is suitable for use in an area under extreme temperature conditions.
IPC 8 full level
C22C 38/12 (2006.01); C21D 8/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01)
CPC (source: CN EP KR)
B21B 1/088 (2013.01 - KR); C21D 1/02 (2013.01 - EP); C21D 1/18 (2013.01 - EP); C21D 1/60 (2013.01 - EP); C21D 8/005 (2013.01 - CN EP KR); C22C 38/02 (2013.01 - CN EP KR); C22C 38/04 (2013.01 - CN EP KR); C22C 38/06 (2013.01 - CN EP KR); C22C 38/08 (2013.01 - CN EP KR); C22C 38/12 (2013.01 - CN EP KR); B21B 2001/221 (2013.01 - KR); C21D 2211/005 (2013.01 - CN KR)
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
DOCDB simple family (publication)
EP 4074858 A1 20221019; EP 4074858 A4 20231018; CN 110938778 A 20200331; JP 2023505172 A 20230208; KR 20220085820 A 20220622; WO 2021115263 A1 20210617
DOCDB simple family (application)
EP 20899696 A 20201208; CN 201911250138 A 20191209; CN 2020134563 W 20201208; JP 2022533226 A 20201208; KR 20227017370 A 20201208