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Technique requirement: inner weld flat, solution treatment, inner surface electro-polished. Specification: inner surface roughness Ra is over 0.2 time, less hanging remnant, easy for clean, anti-germ. Electro-polish is good for passivation, inner surface has anti-corrosion is good. Test: lateral and longitudinal flatten, reverse flatten, hydro test or eddy current inspection, mechanical test, inner surface roughness inspection.Application: milk and food industry, medicine industry, industry for pipes special inner surface requirement. liquid pipe, stainless steel pipe, round pipe
