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1. (WO2018160211) METHOD FOR HOMOGENIZING STEEL COMPOSITIONS
Latest bibliographic data on file with the International BureauSubmit observation

Pub. No.: WO/2018/160211 International Application No.: PCT/US2017/035513
Publication Date: 07.09.2018 International Filing Date: 01.06.2017
IPC:
C21D 8/02 (2006.01) ,C21D 8/04 (2006.01) ,C21D 1/26 (2006.01) ,C21D 1/28 (2006.01)
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
8
Modifying the physical properties by deformation combined with, or followed by, heat treatment
02
during manufacturing of plates or strips
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
8
Modifying the physical properties by deformation combined with, or followed by, heat treatment
02
during manufacturing of plates or strips
04
to produce plates or strips for deep-drawing
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
26
Methods of annealing
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
26
Methods of annealing
28
Normalising
Applicants:
TERRAPOWER, LLC [US/US]; 15800 Northup Way Bellevue, WA 98008, US
Inventors:
HACKETT, Micah, J.; US
Agent:
SMITH, Ryan, C.; US
Priority Data:
15/609,37731.05.2017US
62/464,72328.02.2017US
Title (EN) METHOD FOR HOMOGENIZING STEEL COMPOSITIONS
(FR) PROCÉDÉ D'HOMOGÉNÉISATION DE COMPOSITIONS D'ACIER
Abstract:
(EN) This disclosure describes methods for improving the performance and consistency of steels by closely controlling the initial homogenization of steel compositions prior to hot working. Experimental data is provided illustrating that the traditional austenitization techniques do not take into account diffusion of the various components within a steel composition and, as such, may not completely homogenize the steel composition. In the methods described in this disclosure, the initial step of austenitizing the steel ingot is altered to achieve a more homogenous distribution of the different components throughout the ingot. The improved method includes heating the steel composition to a temperature within the upper half of the pure austenitic phase temperature range and maintaining the steel composition at that temperature for a period of time determined based on the diffusivity in the austenitic phase of the steel composition of at least one constituent of the steel.
(FR) La présente invention concerne des procédés permettant d'améliorer les performances et la consistance d'aciers en contrôlant étroitement l'homogénéisation initiale de compositions d'acier avant un travail à chaud. Des données expérimentales sont présentées. Elles montrent que les techniques classiques d'austénitisation ne tiennent pas compte de la diffusion des divers composants dans une composition d'acier et ne parviennent donc pas à homogénéiser complètement la composition d'acier. Dans les procédés d'après la présente invention, l'étape initiale d'austénitisation du lingot d'acier est modifiée de façon à obtenir une répartition plus homogène des différents composants dans tout le lingot. Le procédé amélioré comprend les étapes consistant à : chauffer la composition d'acier jusqu'à une température se situant dans la moitié supérieure de la plage de température d'une phase austénitique pure ; et maintenir la composition d'acier à cette température pendant une période de temps déterminée sur la base de la diffusivité dans la phase austénitique de la composition d'acier d'au moins un constituant de l'acier.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)