Cast cold rolling roll

DETAILED DESCRIPTION Having now described our invention that we claim as new and desire to secure by Letters Patent is: 1.
A cast bimetallic composite roll for cold rolling, comprising in combination a heart metal constituted by a nodular or lamellar cast iron and a case metal constituted by a steel having a chromium content of 8 to 16% and a carbon content of 0.
65 to 0.
95%, the ratio between the chromium and carbon being between 11 and 16 and the structure of the case metal being martensitic with a residual austenite content of less than 10% and a hardness exceeding 700 HV.
2.
A roll according to claim 1, wherein the case metal has a thickness of substantially 30 to 70 mm.
3.
A roll according to claim 1 or 2, wherein the case metal has the following composition:
______________________________________
C Si Mn Cr Ni Mo V
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%
##STR12##
##STR13##
##STR14##
##STR15##
##STR16##
##STR17##
##STR18##
______________________________________
4.
A roll according to claim 1 or 2, wherein the heart metal is a nodular cast iron having the following composition:
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C Si Mn Ni Cr
______________________________________
%
##STR19##
##STR20##
##STR21##
##STR22##
<0.
15
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5.
A roll according to claim 3, wherein the case metal has the following composition, in percent:
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C Si Mn S P Cr Ni Mo V
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0.
715
0.
470 0.
705 0.
025 0.
020
9