304 stainless steel belongs to the austenitic stainless steel category and is widely recognized for its excellent mechanical performance, including high tensile strength, corrosion resistance, and durability. Apart from its structural advantages, it also offers an aesthetically pleasing surface with high gloss. However, the surface quality of shower room fittings made from 304 stainless steel can be compromised if proper processing procedures are not followed.
One of the major factors that negatively affects the surface brightness and quality is the excessive oil content in the emulsion used during cold rolling. Emulsion is essential in cold rolling operations as it lubricates and cools the stainless steel sheets. However, this emulsion contains oil which, under high temperatures, can break down and produce carbon residues. If these residues are not effectively removed after high-temperature processing, they can adhere to the surface of the stainless steel fittings, forming visible indentations during further rolling.
Additionally, after annealing, the internal surfaces of equipment such as protective covers can accumulate carbonized oil due to the same issue—high oil content in the emulsion. During subsequent processing stages, these carbon residues can be transferred to the stainless steel surface, further affecting the visual appearance and finish of the fittings.
Moreover, prolonged use of rolling and heat treatment equipment without regular cleaning can lead to the accumulation of oil, carbon particles, dust, and other contaminants on components such as convection plates and furnace interiors. These materials can fall onto the stainless steel surface, causing imperfections.
In reality, the chemical integrity and surface finish of 304 stainless steel fittings are closely related to the cleanliness of the manufacturing environment. Regular maintenance and cleaning of machinery—particularly convection plates, furnace surfaces, and protective cover interiors—can significantly reduce surface contamination. By maintaining a clean production environment, manufacturers can not only enhance the surface appearance of stainless steel shower fittings but also extend their lifespan, reduce maintenance costs, and increase overall value.
