Large bladed steel salvage is a salvage item introduced with the Mining and Smithing rework. Salvage has no use other than disassembly, alchemy, or trading.
Large bladed steel salvage is worth 960 coins in high level alchemy. When dropped by a monster, it can automatically be alchemised by a spring cleaner 2000 or higher at the cost of a spring (81 coins profit); alternatively it can be automatically disassembled for free by a spring cleaner 3000 or higher. Because it does not use a spring, automatic disassembly does not advance the spring cleaner towards its next upgrade. Dismantle mode does not work on salvage items.
Large bladed steel salvage can also be bought from Elof for 40 steel item tokens.
For an exhaustive list of all known sources for this item, see here
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