Hygienic dull polished pipe refers to stainless steel tubing with a specific external finish and highly smooth internal finish, designed to meet stringent cleanliness standards in industries like food, beverage, and pharmaceuticals. This finish minimizes product adhesion and bacterial growth.
Key Features and Standards
Dull polished pipe is produced to specific roughness averages (Ra) to ensure product integrity and ease of cleaning.
Material: Typically made from high-grade stainless steel, with AISI 304L and AISI 316L being the common choices. The 316L grade is often used in more corrosive environments for its superior resistance.
Surface Finish:
External: The "dull polished" finish is an abrasive finish with a unidirectional grain, typically produced with a 180 to 240 grit abrasive. This finish (often a No. 4 finish under old standards or 2J under EN 10088-2) provides an aesthetically pleasing, easy-to-clean exterior that also helps to mask minor scratches.
Internal: The internal bore is crucial for hygiene. It features an exceptionally smooth finish, with a typical Ra value of less than 0.8µm. The internal weld bead is also removed (bead rolled) to eliminate crevices or "bug traps".
Standards: Manufactured to comply with key hygienic standards:
EN 10357 (the standard for stainless steel tubes for the food and chemical industry, which replaced DIN 11850).
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