Incoloy 800,Incoloy 800H , and Incoloy 800HT are nickel-iron-chromium super alloys. When exposed to high-temperature these alloys not only provide excellent resistance to oxidation and carburization but also good strength too. These nickel steel alloys are similar except for the higher level of carbon in Incoloy 800H, and the addition of up to 1.20 percent titanium and aluminum in Incoloy 800HT.
Chemical Composition
Incoloy800 800H 800HT
Ni30-3530-3530-35
Fe39.5 min39.5 min39.5 min
Cr19-2319-2319-23
Cu0.75 max0.75 max0.75 max
Ti0.15-0.600.15-0.600.25-0.60
Al0.15-0.60 0.15-0.600.85-1.20
C0.1 max 0.05-0.10.06-0.1
Mn1.5 max1.5 max1.5 max
S0.015 max0.015 max0.015 max
Si1.0 max1.0 max1.0 max
Inconel 625 is a low carbon Nickel-chromium-molybdenum-niobium super alloy .Inconel 625 is a oxidation and corrosion resistant nickel alloy that is used both for its outstanding aqueous corrosion resistance and high strength. Inconel 625‘s outstanding toughness and strength is due to the addition of niobium which acts with the molybdenum to stiffen the alloy’s matrix.
Chemical Composition
Inconel 625
Ni58.0 min
Cr20.0 – 23.0
Fe5.0 max
C0.10 max
Mn0.50 max
Si0.50 max
Mo8.0 – 10.0
Co1.0 max
Al0.40 max
Ti0.40 max
Nb + Ta3.15 – 4.15
P0.015 max
S0.015 max
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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