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American Standard 304 stainless steel pipe has six major standards. Specially provided stainless steel pipe has six major standards.
1. Structure and decorative tube
2. Industrial fluid piping
3. Super large diameter industrial fluid piping
4. Boiler heat exchanger tube
5. Food hygiene tube
6. Thin-wall drinking water pipe, in which the boiler heat exchanger tube is required to perform bright annealing + inner bead leveling, so the price is relatively expensive and the regular food sanitary tube must be brightly annealed + inner bead leveling + inner polishing + External polishing, so the most expensive but the premise, must actually implement ASTM A270, many are internally flattened + inside and outside polished