Composition
C -
0.***0.*2%,
SI - 0.***0.*0%,
MN -
0.***1.*5%,
S - 0.*4% maximum
P - 0.**5%
maximum
AS: - 0.*1% Maximum of Mass Share
Components
The Rails shall conform to ISRI CODE R**-R*5 and will
be Used Rail Steel Scrap-
Standard section” Rails, between 1.2 meters to 1.7
meters long
HMS stands for heavy melting scrap, and 1 & 2 are the
two grades within that definition. Heavy melting steel
(HMS) or heavy melting scrap, is a designation for
recyclable steel and wrought iron. It is broken up into
two major categories: HMS 1 and HMS 2. The difference
between the two is HMS 1 does not contain galvanized and
blackened steel, whereas HMS 2 does.
Both HMS 1 & 2 comprise obsolete scrap only. That is
iron and steel recovered from items demolished or
dismantled at the end of their life. Because both grades
guarantee a minimum piece thickness – at least 1/4inch
(6.3mm) for HMS 1, and 1/8in for HMS 2 – consignments
have a high density. Both also have defined maximum
dimensions (usually *0in x *4in), and should be prepared
to facilitate handling and charging to a furnace.
This density, sizing and preparation makes for efficient
furnace operation by minimising the time to charge enough
scrap for a full melt. In contrast, thin mixed scrap
greatly increases charging time, cutting furnace
productivity.
HMS
is usually traded as a blend of 1 & 2, either a
premium blend (*0:*0) or lower grade mixes (*0:*0) and
(*0:*0).
