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1. (WO2018099819) METHOD FOR MANUFACTURING A HOT-FORMED ARTICLE, AND OBTAINED ARTICLE

Pub. No.:    WO/2018/099819    International Application No.:    PCT/EP2017/080359
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Sat Nov 25 00:59:59 CET 2017
IPC: C21D 1/19
Applicants: TATA STEEL IJMUIDEN B.V.
Inventors: CHEN, Shangping
LAHAYE, Christiaan Theodorus
RANA, Radhakanta
HENSEN, Guido Cornelis
Title: METHOD FOR MANUFACTURING A HOT-FORMED ARTICLE, AND OBTAINED ARTICLE
Abstract:
The invention relates to a method for hot-forming a steel blank into an article comprising the steps of: a. heating a steel blank to a temperature T1 and holding the heated blank at T1 during a time period t1, wherein T1 is in the range of Ac1 to Ac3+200 °C and wherein t1 is at most 12 minutes, b. transferring the heated blank to a hot-forming tool during a transport time t2 during which the temperature of the heated blank decreases from temperature T1 to a temperature T2, wherein T2 is above Ar1 and wherein the transport time t2 is at most 12 seconds, c. forming the blank in the hot-forming tool into an article and quenching it in the hot-forming tool from a temperature T2 to a temperature T3 at a cooling velocity V2 of 25 °C/s or more, d. isothermal holding the article at a temperature T4 for a time period t4, e. wherein temperature T3 and/or temperature T4 is between Ms and Mf and wherein t4 is more than 10 seconds and less than 10 minutes, f. cooling the article from temperature T4 to room temperature at a cooling velocity V4.20 The invention also relates to a hot-formed article obtained by the method.