Use DMAIC on Edge Cracks
Apply DMAIC to a steel quality defect using define, measure, analyze, improve, and control steps.
Edge crack claims are rising, but the cause is unclear and the data is scattered. DMAIC: Define -> Measure -> Analyze -> Improve -> Control The common trap is jumping to the fix the loudest expert already believes. DMAIC slows the team enough to test whether that belief matches the defect pattern. Define Problem: longitudinal edge cracks over 12 mm on grade S420 coils for Customer A, target below 1%. A narrow definition prevents the project from becoming all surface defects for all grades. Measure Build a baseline by heat, width, stand, trim setting, knife life, coiler tension, and inspector…
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