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. 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. The weight doesn t change. Here are some common flat roll steel defects we watch out for.

The most common sheet metal stamping defects are also the easiest to predict using advanced simulation software such as autoform. The shape defect of the steel coil is higher or lower than the one end of the coil and is continuous like a pagoda which appears in the inner outer ring portion of the coil. 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.

It isn t practical to handle this when it s flat so it is coiled as it s produced. They can be caused by carbon smut or grease deposits on the strip being coated or by roll pickup of foreign material. 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.