Effect of Cu addition on delayed fracture resistance of low carbon steel for 1470 MPa grade electric resistance welded tube

Shunsuke Toyoda, Yasuhide Ishiguro, Yoshikazu Kawabata, Kei Sakata, Akio Sato, Jun'ichi Sakai

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    The effect of chemical composition on delayed fracture resistance, taking into consideration the application of a 1 470 MPa grade thin-wall as-rolled electric resistance welded (ERW) tube to automotive structural parts, was investigated. Chemical composition of the base steel alloy was 0.18%C-0.4%Si-1.8%Mn-0.015%Nb-0.01%P-0.001%S. Cu, Ni, Cr, B and Mo were individually added to the base steel. A 4-point bending test in 1 N-hydrocrolic acid was conducted for quench and tempered specimens. Cu added steel showed the best delayed fracture resistance. After the immersion, a metallic Cu layer was formed on the steel surface. Based on the results of the 4-point bending test, several kinds of 1 470 MPa grade ERW steel tubes were prepared and evaluated for their delayed fracture resistance. Cu added steel tubes showed excellent delayed fracture resistance in a cyclic corrosion condition with salt water spray, as well as in hydrocrolic acid. Cu accumulation on the rust-steel interface was observed by electron probe microanalysis (EPMA). An atmospheric corrosion test lasting 12 years was also conducted. Delayed fracture resistance as evaluated by (a) an immersion test in hydrochloric acid, (b) a cyclic corrosion test with salt water spray, and (c) an atmospheric corrosion test, showed good correlation with each other. Based on the results above, two models are proposed for the mechanism of delayed fracture suppression by Cu addition: (1) Cu suppressed cathodic reaction and hydrogen entry at sulfide inclusion, and (2) Cu suppressed hydrogen entry by stabilization of sulfuric-ions as an insoluble compound.

    Original languageEnglish
    Pages (from-to)640-648
    Number of pages9
    JournalISIJ International
    Volume48
    Issue number5
    DOIs
    Publication statusPublished - 2008

    Fingerprint

    Steel
    Low carbon steel
    Fracture toughness
    Atmospheric corrosion
    Saline water
    Bending tests
    Hydrogen
    Corrosion
    Acids
    Hydrochloric Acid
    Electron probe microanalysis
    Alloy steel
    Sulfides
    Hydrochloric acid
    Chemical analysis
    Stabilization
    Ions

    Keywords

    • Corrosion
    • Delayed fracture
    • Hydrogen embrittlement
    • Martensite
    • Residual stress
    • Steel
    • Tube

    ASJC Scopus subject areas

    • Metals and Alloys

    Cite this

    Effect of Cu addition on delayed fracture resistance of low carbon steel for 1470 MPa grade electric resistance welded tube. / Toyoda, Shunsuke; Ishiguro, Yasuhide; Kawabata, Yoshikazu; Sakata, Kei; Sato, Akio; Sakai, Jun'ichi.

    In: ISIJ International, Vol. 48, No. 5, 2008, p. 640-648.

    Research output: Contribution to journalArticle

    Toyoda, Shunsuke ; Ishiguro, Yasuhide ; Kawabata, Yoshikazu ; Sakata, Kei ; Sato, Akio ; Sakai, Jun'ichi. / Effect of Cu addition on delayed fracture resistance of low carbon steel for 1470 MPa grade electric resistance welded tube. In: ISIJ International. 2008 ; Vol. 48, No. 5. pp. 640-648.
    @article{2d44362fe3244248897a4f8f57ea1aac,
    title = "Effect of Cu addition on delayed fracture resistance of low carbon steel for 1470 MPa grade electric resistance welded tube",
    abstract = "The effect of chemical composition on delayed fracture resistance, taking into consideration the application of a 1 470 MPa grade thin-wall as-rolled electric resistance welded (ERW) tube to automotive structural parts, was investigated. Chemical composition of the base steel alloy was 0.18{\%}C-0.4{\%}Si-1.8{\%}Mn-0.015{\%}Nb-0.01{\%}P-0.001{\%}S. Cu, Ni, Cr, B and Mo were individually added to the base steel. A 4-point bending test in 1 N-hydrocrolic acid was conducted for quench and tempered specimens. Cu added steel showed the best delayed fracture resistance. After the immersion, a metallic Cu layer was formed on the steel surface. Based on the results of the 4-point bending test, several kinds of 1 470 MPa grade ERW steel tubes were prepared and evaluated for their delayed fracture resistance. Cu added steel tubes showed excellent delayed fracture resistance in a cyclic corrosion condition with salt water spray, as well as in hydrocrolic acid. Cu accumulation on the rust-steel interface was observed by electron probe microanalysis (EPMA). An atmospheric corrosion test lasting 12 years was also conducted. Delayed fracture resistance as evaluated by (a) an immersion test in hydrochloric acid, (b) a cyclic corrosion test with salt water spray, and (c) an atmospheric corrosion test, showed good correlation with each other. Based on the results above, two models are proposed for the mechanism of delayed fracture suppression by Cu addition: (1) Cu suppressed cathodic reaction and hydrogen entry at sulfide inclusion, and (2) Cu suppressed hydrogen entry by stabilization of sulfuric-ions as an insoluble compound.",
    keywords = "Corrosion, Delayed fracture, Hydrogen embrittlement, Martensite, Residual stress, Steel, Tube",
    author = "Shunsuke Toyoda and Yasuhide Ishiguro and Yoshikazu Kawabata and Kei Sakata and Akio Sato and Jun'ichi Sakai",
    year = "2008",
    doi = "10.2355/isijinternational.48.640",
    language = "English",
    volume = "48",
    pages = "640--648",
    journal = "ISIJ International",
    issn = "0915-1559",
    publisher = "Iron and Steel Institute of Japan",
    number = "5",

    }

    TY - JOUR

    T1 - Effect of Cu addition on delayed fracture resistance of low carbon steel for 1470 MPa grade electric resistance welded tube

    AU - Toyoda, Shunsuke

    AU - Ishiguro, Yasuhide

    AU - Kawabata, Yoshikazu

    AU - Sakata, Kei

    AU - Sato, Akio

    AU - Sakai, Jun'ichi

    PY - 2008

    Y1 - 2008

    N2 - The effect of chemical composition on delayed fracture resistance, taking into consideration the application of a 1 470 MPa grade thin-wall as-rolled electric resistance welded (ERW) tube to automotive structural parts, was investigated. Chemical composition of the base steel alloy was 0.18%C-0.4%Si-1.8%Mn-0.015%Nb-0.01%P-0.001%S. Cu, Ni, Cr, B and Mo were individually added to the base steel. A 4-point bending test in 1 N-hydrocrolic acid was conducted for quench and tempered specimens. Cu added steel showed the best delayed fracture resistance. After the immersion, a metallic Cu layer was formed on the steel surface. Based on the results of the 4-point bending test, several kinds of 1 470 MPa grade ERW steel tubes were prepared and evaluated for their delayed fracture resistance. Cu added steel tubes showed excellent delayed fracture resistance in a cyclic corrosion condition with salt water spray, as well as in hydrocrolic acid. Cu accumulation on the rust-steel interface was observed by electron probe microanalysis (EPMA). An atmospheric corrosion test lasting 12 years was also conducted. Delayed fracture resistance as evaluated by (a) an immersion test in hydrochloric acid, (b) a cyclic corrosion test with salt water spray, and (c) an atmospheric corrosion test, showed good correlation with each other. Based on the results above, two models are proposed for the mechanism of delayed fracture suppression by Cu addition: (1) Cu suppressed cathodic reaction and hydrogen entry at sulfide inclusion, and (2) Cu suppressed hydrogen entry by stabilization of sulfuric-ions as an insoluble compound.

    AB - The effect of chemical composition on delayed fracture resistance, taking into consideration the application of a 1 470 MPa grade thin-wall as-rolled electric resistance welded (ERW) tube to automotive structural parts, was investigated. Chemical composition of the base steel alloy was 0.18%C-0.4%Si-1.8%Mn-0.015%Nb-0.01%P-0.001%S. Cu, Ni, Cr, B and Mo were individually added to the base steel. A 4-point bending test in 1 N-hydrocrolic acid was conducted for quench and tempered specimens. Cu added steel showed the best delayed fracture resistance. After the immersion, a metallic Cu layer was formed on the steel surface. Based on the results of the 4-point bending test, several kinds of 1 470 MPa grade ERW steel tubes were prepared and evaluated for their delayed fracture resistance. Cu added steel tubes showed excellent delayed fracture resistance in a cyclic corrosion condition with salt water spray, as well as in hydrocrolic acid. Cu accumulation on the rust-steel interface was observed by electron probe microanalysis (EPMA). An atmospheric corrosion test lasting 12 years was also conducted. Delayed fracture resistance as evaluated by (a) an immersion test in hydrochloric acid, (b) a cyclic corrosion test with salt water spray, and (c) an atmospheric corrosion test, showed good correlation with each other. Based on the results above, two models are proposed for the mechanism of delayed fracture suppression by Cu addition: (1) Cu suppressed cathodic reaction and hydrogen entry at sulfide inclusion, and (2) Cu suppressed hydrogen entry by stabilization of sulfuric-ions as an insoluble compound.

    KW - Corrosion

    KW - Delayed fracture

    KW - Hydrogen embrittlement

    KW - Martensite

    KW - Residual stress

    KW - Steel

    KW - Tube

    UR - http://www.scopus.com/inward/record.url?scp=47949119164&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=47949119164&partnerID=8YFLogxK

    U2 - 10.2355/isijinternational.48.640

    DO - 10.2355/isijinternational.48.640

    M3 - Article

    VL - 48

    SP - 640

    EP - 648

    JO - ISIJ International

    JF - ISIJ International

    SN - 0915-1559

    IS - 5

    ER -