Global Patent Index - EP 3115482 A4

EP 3115482 A4 2017-05-10 - COLD-ROLLED STEEL SHEET, MANUFACTURING METHOD THEREFOR, AND CAR PART

Title (en)

COLD-ROLLED STEEL SHEET, MANUFACTURING METHOD THEREFOR, AND CAR PART

Title (de)

KALTGEWALZTES STAHLBLECH, HERSTELLUNGSVERFAHREN DAFÜR UND AUTOTEIL

Title (fr)

TÔLE D'ACIER LAMINÉE À FROID, PROCÉDÉ DE FABRICATION S'Y RAPPORTANT ET PIÈCE DE VOITURE

Publication

EP 3115482 A4 (EN)

Application

EP 15759246 A

Priority

  • JP 2014041089 A
  • JP 2015000777 W

Abstract (en)

[origin: WO2015133077A1] Provided are a cold-rolled steel sheet, which has excellent chemical conversion coating properties and also has excellent post-coating corrosion resistance, a manufacturing method therefor, and a car part. On a steel sheet, which has been continuously annealed after cold rolling, a first acid wash is performed with one of the acid solutions A) or B) below and then a second acid wash is performed using an acid solution obtained from a non-oxidizing acid. A) An acid solution containing nitric acid and hydrochloride acid, wherein: the nitric acid concentration is greater than 50 g/L to 200g/L, inclusive; the ratio (R1) (hydrochloric acid/nitric acid) of the hydrochloric acid concentration to the nitric acid concentration is 0.01-0.25; and the Fe ion concentration is 3-50 g/L. B) An acid solution containing nitric acid and hydrofluoric acid, wherein: the nitric acid concentration is greater than 50 g/L to 200 g/L, inclusive; the ratio (R2) (hydrofluoric acid/nitric acid) of the hydrofluoric acid concentration to the nitric acid concentration is 0.01-0.25; and the Fe ion concentration is 3-50 g/L.

IPC 8 full level (invention and additional information)

C23G 1/08 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01)

CPC (invention and additional information)

C22C 38/06 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C23G 1/00 (2013.01); C23G 1/08 (2013.01); C23G 1/081 (2013.01); C23G 1/085 (2013.01); C23G 1/086 (2013.01); C21D 8/0478 (2013.01); C21D 9/46 (2013.01)

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

Designated extension state (EPC)

BA ME

EPO simple patent family

EP 3115482 A1 20170111; EP 3115482 A4 20170510; CN 106062253 A 20161026; JP 6108028 B2 20170405; JP WO2015133077 A1 20170406; MX 2016011278 A 20161125; WO 2015133077 A1 20150911

INPADOC legal status


2017-06-07 [DAX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT (TO ANY COUNTRY) (DELETED)

2017-05-10 [A4] DESPATCH OF SUPPLEMENTARY SEARCH REPORT

- Effective date: 20170406

2017-05-03 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C21D 9/46 20060101ALI20170329BHEP

2017-05-03 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/00 20060101ALI20170329BHEP

2017-05-03 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C23G 1/08 20060101AFI20170329BHEP

2017-05-03 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/06 20060101ALI20170329BHEP

2017-01-11 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20161004

2017-01-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): 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

2017-01-11 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: BA ME