What's the price difference between heavy melting steel and light structural steel scrap?
Short answer: Heavy melting steel (HMS), made up of thick, dense steel pieces, typically prices higher per tonne than light structural steel, which is thinner-gauge material that's less dense and more prone to rust and contamination — the grading distinction exists because thickness and density directly affect how efficiently a mill can melt and process the material.
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List Free →What separates HMS from light structural
Heavy melting steel refers to thick-gauge steel pieces, generally a certain minimum thickness, that are dense and mill-ready with minimal processing. Light structural steel is thinner material — angle iron, light beams, sheet offcuts — that’s less dense per unit volume and often needs more handling to process efficiently.
Why thickness drives the price gap
Thicker steel melts more efficiently and predictably in a furnace, and there’s simply more usable steel per piece relative to any surface rust or coating. Thin material has a higher surface-area-to-volume ratio, meaning proportionally more of its mass is affected by rust or oxidation, which is why it commonly grades and prices below HMS.
What determines which grade your load falls into
Grading generally comes down to a minimum thickness threshold set by the specific buyer or mill, sometimes combined with piece size limits. If you’re unsure which grade your material falls into, ask the buyer directly what thickness and size cutoffs they use for HMS versus light structural.
How ScrapTrade Makes This Easier
Describing your load’s general thickness and piece type in a ScrapTrade listing helps buyers quote the correct grade upfront rather than defaulting to a conservative mixed-steel estimate.
Ready to sell or source steel and ferrous scrap without the guesswork? ScrapTrade connects verified buyers and sellers with escrow-protected payments and transparent weighing.
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