Incoloy 825 (Nickel-Iron-Chromium alloy) with addition of copper and molybdenum .Against aqueous corrosion it has better resistance as compared to Incoloy 800, otherwise both are same .To provide exceptional resistance against many corrosive environments is how the chemical composition of Incoloy 825 is designed .Incoloy 825 is specially resistant to sulfuric and phosphoric acids.
Chemical Composition
Incoloy 825
Ni38.0 46.0
Cr19.5 23.5
Fe22.0 min
Mb2.5 3.5
Ti0.6 1.2
Cu1.5 3.0
Mn1.0 max
C0.05 max
S0.03 max
Al0.2 max
Si0.5 max
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 60in x 24in), 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 (80:20) or lower grade mixes (70:30) and (60:40).
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