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DK200000936A - Ultra-high strength steels and excellent fracture toughness at cryogenic temperatures - Google Patents

Ultra-high strength steels and excellent fracture toughness at cryogenic temperatures Download PDF

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Publication number
DK200000936A
DK200000936A DK200000936A DKPA200000936A DK200000936A DK 200000936 A DK200000936 A DK 200000936A DK 200000936 A DK200000936 A DK 200000936A DK PA200000936 A DKPA200000936 A DK PA200000936A DK 200000936 A DK200000936 A DK 200000936A
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Denmark
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approx
weight
steel plate
ultra
high strength
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DK200000936A
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Danish (da)
Inventor
Jayoung Koo
Narasimha-Rao V Bangaru
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Exxonmobil Upstream Res Co
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Publication of DK200000936A publication Critical patent/DK200000936A/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/001—Heat treatment of ferrous alloys containing Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/02—Hardening by precipitation
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Arc Welding In General (AREA)

Description

PATENTKRAV 1. Fremgangsmåde til fremstilling afen stålplade med en DBTT på under ca. -73°C (-100°F) i både stålpladen og dens HAZ, en trækstyrke på over 830 MPa (120 ksi) og en mikrostruktur, der omfatter overvejende hærdet, finkornet båndmartensit, hærdet, finkornet nedre bainit eller blandinger deraf, hvilken fremgangsmåde omfatter følgende trin: (a) opvarmning af en stålblok til en genopvarmningstemperatur, som (i) er tilstrækkeligt høj til i det væsentlige at homogenisere stålblokken og opløse i det væsentlige alle carbider og carbonitrider af niobium og vanadium i stålblokken og (ii) er tilstrækkeligt lav til at etablere initiale austenitkorn med en kornstørrelse på mindre end ca. 120 pm i stålblokken; (b) reduktion af stålblokken til dannelse af stålplade i én eller flere varmvalsepassager i et første temperaturinterval, hvor austenit genkrystalliserer; (c) yderligere reduktion af stålpladen i én eller flere varmvalsepassager i et andet temperaturinterval under omkring Tnr-temperaturen og over omkring Ar3-omdannelsestemperatu-ren; (d) bratkøling af stålpladen ved en afkølingshastighed på fra ca. 10°C pr. sekund til ca. 40°C pr. sekund (18°F/sek - 72°F/sek) til en bratkølingsstoptemperatur (Quench Stop Temperature (QST)) på under omkring Ms-omdannelsestemperaturen plus 200eC (360°F); (e) standsning af bratkølingen; og (f) hærdning af stålpladen ved en hærdningstemperatur på fra ca. 400°C (752°F) til omkring Ae,-omdannelsestemperaturen i et tidsrum, som er tilstrækkeligt til at forårsage udfældning af hærdningspartikler, for derved at lette omdannelse af mikrostrukturen i stålpladen til overvejende hærdet, finkornet båndmartensit, hærdet, finkornet nedre bainit eller blandinger deraf. 2. Fremgangsmåde ifølge krav 1, hvor genopvarmningstemperaturen i trin (a) er mellem ca. 955°C og ca. 1065°C (1750°F - 1950°F). 3. Fremgangsmåde ifølge krav 1, hvor der i trin (b) sker en reduktion i stålblokkens tykkelse på fra ca. 30% til ca. 70%. 4. Fremgangsmåde ifølge krav 1, hvor der i trin (c) sker en reduktion i stålpladens tykkelse på fra ca. 40% til ca. 80%. 5. Fremgangsmåde ifølge krav 1 og yderligere omfattende et trin, hvor stålpladen lades luftkøle til omgivelsestemperatur fra bratkølingsstoptemperaturen (QST) inden hærdning af stålpladen i trin (f). 6. Fremgangsmåde ifølge krav 1, hvor stålblokken i trin (a) omfatter jern og følgende legeringsgrundstoffer i de angivne vægtprocenter: fra ca. 0,04% til ca. 0,12% C, fra mindst ca. 1% Ni til under ca. 9% Ni, fra ca. 0,1% til ca. 1,5% Cu, fra ca. 0,1% til ca. 0,8% Mo, fra ca. 0,02% til ca. 0,1 % Nb, fra ca. 0,008% til ca. 0,03% Ti, fra ca. 0,001% til ca. 0,05% Al og fra ca. 0,002% til ca. 0,005% N. 7. Fremgangsmåde ifølge krav 6, hvor stålblokken omfatter mindre end ca. 6 vægtprocent Ni. 8. Fremgangsmåde ifølge krav 6, hvor stålblokken omfatter mindre end ca. 3 vægtprocent Ni og yderligere omfatter fra ca. 0,5 vægtprocent til ca. 2,5 vægtprocent Mn. 9. Fremgangsmåde ifølge krav 6, hvor stålblokken yderligere omfatter mindst ét additiv valgt fra gruppen bestående af (i) op til ca. 1,0 vægtprocent Cr, (ii) op til ca. 0,5 vægtprocent Si, (iii) op til ca. 0,1 vægtprocent V og (iv) op til ca. 2,5 vægtprocent Mn. 10. Fremgangsmåde ifølge krav 6, hvor stålblokken yderligere omfatter fra ca. 0,0004 vægtprocent til ca. 0,0020 vægtprocent B. 11. Fremgangsmåde ifølge krav 1, hvor stålpladen omfatter i det væsentlige 100% hærdet, finkornet båndmartensit efter hærdningen i trin (f). 12. Stålplade med en DBTT på under ca. -73°C (-100°F) i både stålpladen og dens HAZ, en trækstyrke på over 830 MPa (120 ksi) og en mikrostruktur, der omfatter overvejende hærdet, finkornet båndmartensit, hærdet, finkornet nedre bainit eller blandinger deraf, og hvor stålpladen er fremstillet afen genopvarmet stålblok, der omfatter jern og følgende legeringsgrundstoffer i de angivne vægtprocenter: fra ca. 0,04% til ca. 0,12% C, fra mindst ca. 1% Ni til mindre end ca. 9% Ni, fra ca. 0,1% til ca. 1,5% Cu, fra ca. 0,1 % til ca. 0,8% Mo, fra ca. 0,02% til ca. 0,1 % Nb, fra ca. 0,008% til ca. 0,03% Ti, fra ca. 0,001% til ca. 0,05% Al og fra ca. 0,002% til ca. 0,005% N. 13. Stålplade ifølge krav 12, hvor stålblokken omfatter mindre end ca. 6 vægtprocent Ni. 14. Stålplade ifølge krav 12, hvor stålblokken omfatter mindre end ca. 3 vægtprocent Ni og yderligere omfatter fra ca. 0,5 vægtprocent til ca. 2,5 vægtprocent Mn. 15. Stålplade ifølge krav 12 og yderligere omfattende mindst ét additiv valgt fra gruppen bestående af (i) op til ca. 1,0 vægtprocent Cr, (ii) op til ca. 0,5 vægtprocent Si, (iii) op til ca. 0,1 vægtprocent V og (iv) op til ca. 2,5 vægtprocent Mn. 16. Stålplade ifølge krav 12 og yderligere omfattende fra ca. 0,0004 vægtprocent til ca. 0,0020 vægtprocent B. 17. Fremgangsmåde til at opnå en DBTT på under ca. -73°C (-100°F) i en stålplades HAZ ved at tilsætte mindst ca. 1,0 vægtprocent Ni og mindst ca. 0,1 vægtprocent Cu og ved væsentligt at minimere tilsætning af BCC-stabiliserende grundstoffer.PATENT REQUIREMENTS 1. Process for manufacturing a steel plate having a DBTT of less than about -73 ° C (-100 ° F) in both the steel plate and its HAZ, a tensile strength exceeding 830 MPa (120 ksi) and a microstructure comprising predominantly cured, fine-grained band martensite, cured, fine-grained lower bainite or mixtures thereof, comprises the following steps: (a) heating a steel block to a reheat temperature which (i) is sufficiently high to substantially homogenize the steel block and dissolve substantially all the carbides and carbonitrides of niobium and vanadium in the steel block and (ii) is sufficient low to establish initial austenite grains with a grain size of less than ca. 120 pm in the steel block; (b) reducing the steel block to form steel plate in one or more hot roll passages in a first temperature range wherein austenite recrystallizes; (c) further reducing the steel plate in one or more hot roll passages in a second temperature range below about the Tnr temperature and above about the Ar 3 conversion temperature; (d) quenching of the steel plate at a cooling rate of about 10 ° C per day. second to approx. 40 ° C per day. second (18 ° F / sec - 72 ° F / sec) to a quench stop temperature (QST) of less than about the Ms conversion temperature plus 200 ° C (360 ° F); (e) stopping quenching; and (f) curing the steel plate at a curing temperature of from ca. 400 ° C (752 ° F) to about Ae, mixtures thereof. A method according to claim 1, wherein the reheat temperature in step (a) is between approx. 955 ° C and approx. 1065 ° C (1750 ° F - 1950 ° F). The method according to claim 1, wherein in step (b) a reduction in the thickness of the steel block of from approx. 30% to approx. 70%. The method of claim 1, wherein in step (c), a reduction in the thickness of the steel plate occurs from approx. 40% to approx. 80%. The method of claim 1, further comprising a step of allowing the steel plate to be cooled to ambient temperature from the quench stop temperature (QST) before curing the steel plate in step (f). The method of claim 1, wherein the steel block of step (a) comprises iron and the following alloying elements in the weight percentages indicated: 0.04% to approx. 0.12% C, from at least approx. 1% Ni to below approx. 9% Ni, from approx. 0.1% to approx. 1.5% Cu, from approx. 0.1% to approx. 0.8% Mo, from approx. 0.02% to approx. 0.1% Nb, from approx. 0.008% to approx. 0.03% Ti, from approx. 0.001% to approx. 0.05% Al and from approx. 0.002% to approx. 0.005% N. The method of claim 6, wherein the steel block comprises less than approx. 6% by weight Ni. The method of claim 6, wherein the steel block comprises less than approx. 3% by weight Ni and further comprises from ca. 0.5% by weight to approx. 2.5% by weight Mn. The method of claim 6, wherein the steel block further comprises at least one additive selected from the group consisting of (i) up to approx. 1.0% by weight Cr, (ii) up to approx. 0.5% Si, (iii) up to approx. 0.1% by weight V and (iv) up to approx. 2.5% by weight Mn. The method of claim 6, wherein the steel block further comprises from ca. 0.0004% by weight to approx. A process according to claim 1, wherein the steel plate comprises substantially 100% cured fine-grained strip martensite after curing in step (f). 12. Steel plate with a DBTT of less than approx. -73 ° C (-100 ° F) in both the steel plate and its HAZ, a tensile strength greater than 830 MPa (120 ksi) and a microstructure comprising predominantly cured, fine-grained band martensite, cured, fine-grained lower bainite or mixtures thereof, and the steel plate is made of a reheated steel block comprising iron and the following alloying elements in the indicated weight percentages: from approx. 0.04% to approx. 0.12% C, from at least approx. 1% Ni to less than approx. 9% Ni, from approx. 0.1% to approx. 1.5% Cu, from approx. 0.1% to approx. 0.8% Mo, from approx. 0.02% to approx. 0.1% Nb, from approx. 0.008% to approx. 0.03% Ti, from approx. 0.001% to approx. 0.05% Al and from approx. 0.002% to approx. 0.005% N. The steel plate according to claim 12, wherein the steel block comprises less than approx. 6% by weight Ni. A steel plate according to claim 12, wherein the steel block comprises less than approx. 3% by weight Ni and further comprises from ca. 0.5% by weight to approx. 2.5% by weight Mn. A steel plate according to claim 12 and further comprising at least one additive selected from the group consisting of (i) up to approx. 1.0% by weight Cr, (ii) up to approx. 0.5% Si, (iii) up to approx. 0.1% by weight V and (iv) up to approx. 2.5% by weight Mn. A steel plate according to claim 12 and further comprising from approx. 0.0004% by weight to approx. 0.0020% by weight B. 17. A method of obtaining a DBTT of less than ca. -73 ° C (-100 ° F) in a steel plate HAZ by adding at least approx. 1.0% by weight Ni and at least approx. 0.1% by weight Cu and by substantially minimizing the addition of BCC stabilizing elements.

DK200000936A 1997-12-19 2000-06-16 Ultra-high strength steels and excellent fracture toughness at cryogenic temperatures DK200000936A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US6819497P 1997-12-19 1997-12-19
PCT/US1998/012702 WO1999032672A1 (en) 1997-12-19 1998-06-18 Ultra-high strength steels with excellent cryogenic temperature toughness

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EP (1) EP1047799A1 (en)
JP (1) JP2001527155A (en)
KR (1) KR20010024757A (en)
CN (1) CN1282381A (en)
AR (1) AR013108A1 (en)
AT (1) ATA915498A (en)
AU (1) AU8151198A (en)
BG (1) BG104622A (en)
BR (1) BR9813630A (en)
CA (1) CA2316968A1 (en)
CO (1) CO5050267A1 (en)
DE (1) DE19882879T1 (en)
DK (1) DK200000936A (en)
FI (1) FI20001438A7 (en)
GB (1) GB2348887A (en)
HR (1) HRP980346A2 (en)
HU (1) HUP0101125A3 (en)
IL (1) IL136842A0 (en)
NO (1) NO20003175D0 (en)
OA (1) OA11422A (en)
PE (1) PE93599A1 (en)
PL (1) PL342646A1 (en)
SE (1) SE0002245L (en)
SI (1) SI20278A (en)
SK (1) SK8682000A3 (en)
TN (1) TNSN98098A1 (en)
TR (1) TR200001797T2 (en)
TW (1) TW459052B (en)
WO (1) WO1999032672A1 (en)
ZA (1) ZA985325B (en)

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JP6582590B2 (en) * 2015-06-17 2019-10-02 日本製鉄株式会社 Steel sheet for LPG storage tank and method for producing the same
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