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Hydrocarbons are cracked at temperature between 850
deg. C to 1100 deg. C and at pressures of upto 6kg/cm2
to produce olefins and aromatics like Ethlyne, Propylene,
Butadine, Benzene and Toluene. In the present day
high density furnaces, the temperature may go upto
1120 deg. C or higher. As a result, the alloys used
should posses excellent carburisation resistance and
a number of special alloys have been developed in
addition to normal alloys like HK-40, HP-40 NB and
HP-40 WNB. Some of these alloys are HP-40NBTi (Micro-alloyed),
25Cr-35Ni-4.5w, 28Cr-48Ni-5w(Alloy 22H), 45Ni - 35CrWNB,
45Ni-35CrWNB (Micro-alloyed), etc. |
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