ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Nowadays, it is not evident to produce in a robust way cold rolled andannealed/galvanised high strength steels based on lean chemistries and with consistentmechanical properties over the coil length. The reasons behind this are first the low coolingrates available on the lines which require the use of a large amount of alloying elements foravoiding the unwanted phases such as the pearlite and secondly the difficult control of soakingtemperature and time in a narrow range, resulting in a variable austenite content at the end ofthe soaking and then in a dispersion of the obtained mechanical properties.By considering high speed cooling technologies on a compact annealing/galvanizing line, thisproduction becomes possible. After rapid heating by means of induction heating and shortholding at a high soaking temperature, the strip is cooled down to an intermediate temperature,where it is held for a short period for obtaining a stable ferrite-austenite structure. Then it israpidly cooled by means of cold water (Twice) in the case of a continuous annealing line or bythe zinc quench process in the case of the galvanizing line. These rapid cooling equipmentsallow reaching high tensile strength levels with a significant reduction of the addition ofexpensive elements (Mn, Cr and Mo)
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4405.pdf
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