FEATURES OF HR COILS

• Hot-rolled coils are often used in applications where dimensional tolerances are not very critical, such as railroads and construction materials.

• HR Black: The hot rolled coils develop a brownish-black oxide layer on the surface after processing, hence referred to as “HR Black coils.”

• HRAP: If a better surface finish is required, then oxide scaling can be removed by shot blasting (mechanically) and pickling (chemically) in order to obtain a No. 1 finish as per ASTM A480/A480M specifications. Hot rolled coils are annealed and pickled in continuous annealing-pickling lines having a scale breaker, shot blasting unit, electrolytic sulphuric acid, and mixed acid bath.

• HRAP coils have a cleaner surface and have improved mechanical properties for downstream processing.