What Is Scrap Yield in Steel Coil Slitting and How Is It Calculated?
Release time:
2026-09-11
This article explains what scrap yield means in steel coil slitting, how it is calculated, and why coil width, slit pattern, edge trim, and other planning all affect material utilization. When steel coil is slit into narrower strips, not every millimeter of the master coil becomes finished product. Some material may be lost through edge trimming, setup allowance, or unsuitable leftover width.
When steel coil is slit into narrower strips, not every millimeter of the master coil becomes finished product. Some material may be lost through edge trimming, setup allowances, or unsuitable leftover width.
That loss is often described through scrap yield or scrap rate. For buyers and processors, understanding it matters because even a small percentage of scrap can become a significant cost on large-volume orders. Think of slitting like cutting fabric from a wide roll: the better the cutting pattern, the less material ends up unused.
What Does Scrap Yield Mean in Coil Slitting?
In practical terms, scrap yield shows how much material becomes scrap compared with the total coil input.
A common calculation is:
Scrap Rate (%) = Scrap Weight ÷ Input Coil Weight × 100
For example, if a 20-ton master coil produces 19.4 tons of usable slit coil and 0.6 tons of scrap, the scrap rate is:
0.6 ÷ 20 × 100 = 3%
Material utilization would therefore be 97%.
Why Edge Trim Creates Scrap
Steel coil edges may need trimming before or during slitting to achieve the required strip width and edge quality.
If a 1,250 mm master coil is used to produce six 200 mm strips, the finished slit width totals 1,200 mm. The remaining 50 mm must be allocated to edge trim, slit allowances, or leftover material.
This is why master coil width and required slit widths should be planned together rather than treated as separate specifications.
How Slitting Patterns Affect Material Yield
A well-designed slit pattern can reduce scrap considerably.
Processors may combine different strip widths in one master coil to improve utilization. However, the arrangement must still consider knife setup, minimum trim requirements, coil width tolerance, and equipment limitations.
The lowest scrap percentage is not always the only goal. Stable production and acceptable edge quality are equally important.
What Should Buyers Confirm Before Ordering?
Buyers should specify the master coil width, required slit widths, quantity by size, edge condition, width tolerance, acceptable scrap basis, and whether scrap is included in the commercial calculation.
At Bao Metal, we supply and process steel coil for distributors, service centers, fabricators, and industrial buyers, with slit patterns and material utilization reviewed according to order requirements. And we have steel plate, steel coil, steel pipe, steel round bar, steel profile, wire rod, rebar.
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