EP 3859026 B1 20230906 - HIGH STRENGTH STEEL PLATE FOR SOUR-RESISTANT LINE PIPE AND METHOD FOR MANUFACTURING SAME, AND HIGH STRENGTH STEEL PIPE USING HIGH STRENGTH STEEL PLATE FOR SOUR-RESISTANT LINE PIPE
Title (en)
HIGH STRENGTH STEEL PLATE FOR SOUR-RESISTANT LINE PIPE AND METHOD FOR MANUFACTURING SAME, AND HIGH STRENGTH STEEL PIPE USING HIGH STRENGTH STEEL PLATE FOR SOUR-RESISTANT LINE PIPE
Title (de)
HOCHFESTE STAHLPLATTE FÜR SAUERGAS-RESISTENTE LEITUNGSROHRE UND VERFAHREN ZU IHRER HERSTELLUNG, UND HOCHFESTES STAHLROHR UNTER VERWENDUNG VON HOCHFESTEN STAHLPLATTEN FÜR SAUERGAS-RESISTENTE LEITUNGSROHRE
Title (fr)
PLAQUE D'ACIER A HAUTE RESISTANCE POUR TUYAU DE LIGNE RESISTANT A L'ACIDE ET PROCEDE DE FABRICATION, ET TUYAU EN ACIER A HAUTE RESISTANCE UTILISANT UNE PLAQUE D'ACIER A HAUTE RESISTANCE POUR TUYAU DE LIGNE RESISTANT A L'ACIDE
Publication
Application
Priority
- JP 2018185791 A 20180928
- JP 2019037698 W 20190925
Abstract (en)
[origin: EP3859026A1] Disclosed is a high strength steel plate for a sour-resistant line pipe that is excellent not only in HIC resistance but also in SSCC resistance under more severe corrosion environments and environments with low hydrogen sulfide partial pressure below 1 bar. The high strength steel plate for a sour-resistant line pipe disclosed herein has: a chemical composition containing C, Si, Mn, P, S, Al, Mo, and Ca, and at least one of Nb or Ti, in predetermined amounts, with the balance being Fe and inevitable impurities; a steel microstructure at 0.25 mm below a surface of the steel plate being a bainite microstructure having a dislocation density of 1.0 × 10<sup>14</sup> to 7.0 × 10<sup>14</sup> (m<sup>-2</sup>); a variation in Vickers hardness at 0.25 mm below the surface of the steel plate being 30 HV or less at 3σ, where σ is a standard deviation; a variation in Vickers hardness in a plate thickness direction being 30 HV or less at 3σ, where σ is a standard deviation; and a tensile strength being 520 MPa or more.
IPC 8 full level
C22C 38/00 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (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 38/58 (2006.01)
CPC (source: EP KR RU)
C21D 6/005 (2013.01 - EP); C21D 6/008 (2013.01 - EP); C21D 8/0226 (2013.01 - EP KR RU); C21D 8/0263 (2013.01 - EP); C21D 9/46 (2013.01 - KR); C22C 38/001 (2013.01 - EP); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP KR); C22C 38/12 (2013.01 - EP KR RU); C22C 38/14 (2013.01 - EP KR RU); C22C 38/16 (2013.01 - EP); C22C 38/20 (2013.01 - KR); C22C 38/22 (2013.01 - RU); C22C 38/24 (2013.01 - RU); C22C 38/26 (2013.01 - RU); C22C 38/28 (2013.01 - RU); C22C 38/38 (2013.01 - RU); C22C 38/42 (2013.01 - EP); C22C 38/44 (2013.01 - EP RU); C22C 38/46 (2013.01 - EP RU); C22C 38/48 (2013.01 - EP RU); C22C 38/50 (2013.01 - EP RU); C22C 38/58 (2013.01 - RU); C21D 2211/002 (2013.01 - 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
DOCDB simple family (publication)
EP 3859026 A1 20210804; EP 3859026 A4 20210901; EP 3859026 B1 20230906; BR 112021005599 A2 20210629; CN 112752858 A 20210504; CN 112752858 B 20220722; JP 6825749 B2 20210203; JP WO2020067210 A1 20210215; KR 102524176 B1 20230420; KR 20210064296 A 20210602; RU 2767261 C1 20220317; WO 2020067210 A1 20200402
DOCDB simple family (application)
EP 19864846 A 20190925; BR 112021005599 A 20190925; CN 201980063051 A 20190925; JP 2019037698 W 20190925; JP 2020524425 A 20190925; KR 20217011928 A 20190925; RU 2021112075 A 20190925