Defects In Steel Sheets

The annealed steel sheet surface exhibits an irregular or island like black brown pattern.

Defects in steel sheets.

Defects of the continuous cast steel products are formed due to several factors which include material related factors casting speeds and temperatures mould oscillation casting powder segregation coefficient of solute elements phase transformation and mechanical and thermal stresses. The weight doesn t change. This means the length of your sheet metal can be over a mile long. Bare spots galvanized coated bare spots result when coating fails to adhere leaving the substrate exposed.

Surface defects surface defects is an important issue in sheet metal stamping as the stamping process affects surface appearance and thus influences surface quality. Here are some common flat roll steel defects we watch out for. When sheet metal is rolled the width doesn t change but since the thickness is dramatically reduced the length must increase by a similar percentage. Choosing the wrong size blank under estimating the number of forming tools required or encountering an unexpected wrinkle or split can be very costly if only discovered during first physical tool tryout.

It isn t practical to handle this when it s flat so it is coiled as it s produced. A great amount of time is therefore spent during the product development process on the optimization of surface defects particularly surface lows during tryout. They can be caused by carbon smut or grease deposits on the strip being coated or by roll pickup of foreign material.