Global Patent Index - EP 4206351 A4

EP 4206351 A4 20240320 - 980 MPA-GRADE BAINITE HIGH HOLE EXPANSION STEEL AND MANUFACTURING METHOD THEREFOR

Title (en)

980 MPA-GRADE BAINITE HIGH HOLE EXPANSION STEEL AND MANUFACTURING METHOD THEREFOR

Title (de)

980 BAINITSTAHL MIT HOHER LOCHEXPANSION IN MPA-QUALITÄT UND HERSTELLUNGSVERFAHREN DAFÜR

Title (fr)

ACIER À FORTE EXPANSION DE TROU EN BAINITE DE QUALITÉ 980 MPA ET PROCÉDÉ DE FABRICATION DE CELUI-CI

Publication

EP 4206351 A4 20240320 (EN)

Application

EP 21860563 A 20210830

Priority

  • CN 202010897959 A 20200831
  • CN 2021115433 W 20210830

Abstract (en)

[origin: EP4206351A1] Disclosed are a 980 MPa-grade bainite high hole expansion steel and a manufacturing method therefor. The steel contains the following chemical components in percentages by weight: 0.05-0.10% of C, 0.5-2.0% of Si, 1.0-2.0% of Mn, P≤0.02%, S≤0.003%, 0.02-0.08% of Al, N≤0.004%, Mo≥0.1%, 0.01-0.05% of Ti, Cr≤0.5%, B≤0.002%, O≤0.0030%, and the balance of Fe and other inevitable impurities. The high hole expansion steel of the present invention has a yield strength of ≥800 MPa and a tensile strength of ≥980MPa, has a good elongation rate (the transverse A<sub>50</sub> being ≥11%) and hole expansion performance (the hole expansion ratio being ≥40%), and can be applied to a position on a chassis part of a passenger car, such as a control arm and a vice frame, where high strength and thinning are required.

IPC 8 full level

C22C 38/02 (2006.01); C21D 8/02 (2006.01); C22C 33/04 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01)

CPC (source: CN EP KR US)

B21B 37/56 (2013.01 - KR); C21D 1/02 (2013.01 - EP); C21D 1/18 (2013.01 - EP); C21D 1/19 (2013.01 - EP); C21D 1/26 (2013.01 - KR); C21D 1/60 (2013.01 - EP); C21D 1/84 (2013.01 - EP US); C21D 6/001 (2013.01 - US); C21D 6/002 (2013.01 - EP US); C21D 6/004 (2013.01 - EP US); C21D 6/005 (2013.01 - EP); C21D 6/008 (2013.01 - EP); C21D 8/0205 (2013.01 - CN EP US); C21D 8/021 (2013.01 - EP); C21D 8/0226 (2013.01 - CN EP KR US); C21D 8/0247 (2013.01 - EP); C21D 8/0263 (2013.01 - CN EP); C21D 8/0278 (2013.01 - EP US); C21D 9/0081 (2013.01 - KR); C21D 9/46 (2013.01 - EP); C21D 9/52 (2013.01 - KR US); C22C 33/04 (2013.01 - CN US); C22C 38/001 (2013.01 - EP KR US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - CN EP US); C22C 38/04 (2013.01 - CN EP US); C22C 38/06 (2013.01 - CN EP KR US); C22C 38/08 (2013.01 - EP US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/16 (2013.01 - EP US); C22C 38/20 (2013.01 - CN EP); C22C 38/22 (2013.01 - CN EP KR US); C22C 38/24 (2013.01 - CN EP KR US); C22C 38/26 (2013.01 - CN EP KR US); C22C 38/28 (2013.01 - CN EP KR US); C22C 38/32 (2013.01 - CN EP KR US); C22C 38/34 (2013.01 - EP KR US); C22C 38/38 (2013.01 - EP KR US); C22C 38/42 (2013.01 - CN EP US); C22C 38/44 (2013.01 - CN EP US); C22C 38/46 (2013.01 - CN EP US); C22C 38/48 (2013.01 - CN EP US); C22C 38/50 (2013.01 - CN EP US); C22C 38/54 (2013.01 - CN EP US); C22C 38/58 (2013.01 - EP KR US); C23G 3/02 (2013.01 - KR); C21D 2211/001 (2013.01 - EP); C21D 2211/002 (2013.01 - CN EP KR US); C23G 1/08 (2013.01 - EP)

Citation (search report)

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

DOCDB simple family (publication)

EP 4206351 A1 20230705; EP 4206351 A4 20240320; CN 114107798 A 20220301; JP 2023539650 A 20230915; KR 20230059810 A 20230503; US 2023313333 A1 20231005; WO 2022042731 A1 20220303

DOCDB simple family (application)

EP 21860563 A 20210830; CN 202010897959 A 20200831; CN 2021115433 W 20210830; JP 2023513802 A 20210830; KR 20237009928 A 20210830; US 202118043267 A 20210830