Knowing where carbonaceous deposits come from and why they occur in hydrogen annealing of steel strip is the first step in reducing or eliminating them.
Steel strip, rod and wire products usually are heat treated in a controlled atmosphere during their manufacture to maintain a high-quality surface while improving their formability. Consistency and reliability in surface quality are important, particularly for products that will be painted or hot-dip and electrolytically galvanized before shipping. Continuous annealing furnaces (strand annealers, etc.) working separately or as a part of a continuous process line provide higher surface quality than batch furnaces.