ASTM A270 TP304 Sanitary Stainless Steel Seamless Tube for Food Pharmaceuticals
ASTM A270 is a specification for sanitary grade stainless steel pipes, suitable for seamless and welded austenitic stainless steel pipes, designed specifically for industries such as food, pharmaceuticals, dairy products, etc. that require high cleanliness. TP304 is a classic 18-8 austenitic stainless steel (chromium 18-20%, nickel 8-10.5%), free of molybdenum, and provides good corrosion resistance and formability through low carbon content (≤ 0.08%).
ASTM A270 TP304 Sanitary Stainless Steel Seamless Tube Manufacturing Process
Molding process:
- Seamless pipe: mainly made through hot rolling or cold drawing processes, ensuring smooth inner walls.
- Welded pipes: TIG welding or laser welding are mainly used, and solution treatment (1050-1150 ° C rapid cooling) is required after welding to eliminate welding stress.
Surface treatment:
- Acid pickling passivation: Remove the oxide layer and form a passivation film.
- Electrolytic polishing (EP): improves surface smoothness (Ra ≤ 0.5 μ m), reduces microbial adhesion, and meets hygiene requirements.
ASTM A270 Sanitary Stainless Steel Tube Chemical Composition
| SS GRADE | ASTM A270/ASME SA 270 CHEMICAL COMPOSITION % MAXIMUM |
|---|
| C | MN | P | S | SI | CR | NI | MO |
|---|
| TP304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 8.0-11.0 | 2.00-3.00 |
| TP304L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 8.0-12.0 | 2.00-3.00 |
ASTM A270 Sanitary Stainless Steel Seamless Tube Mechanical Properties
| SS GRADE | Tensile Strength, min, ksi [MPa] | Yield Strength,min, ksi [MPa] | Elongation in 2 in. or 50 mm, min, %B,C |
|---|
|
| TP304 | 75 [515] | 30 [205] | 35 |
| TP304L | 70 [485] | 25 [170] | 35 |
ASTM A270 sanitary stainless steel seamless tubes have strong corrosion resistance and can maintain good stability in general oxidizing acids (such as nitric acid), organic acids, and alkaline media. However, their resistance to pitting corrosion in chloride environments is weaker than TP316 (because they do not contain molybdenum), and long-term contact with chlorine containing media should be avoided.
In terms of hygiene performance, ASTM A270 sanitary stainless steel seamless tubes need to have smooth inner walls without dead corners during production, comply with 3-A Sanitary Standards, FDA, and EHEDG certification requirements, and have easy cleaning and high temperature steam sterilization resistance (applicable to CIP/SIP systems).
ASTM A270 Sanitary Stainless Steel Seamless Tube Application:
- Food and beverage: ASTM A270 sanitary stainless steel seamless tube can be widely used in dairy product pipelines, beer brewing equipment, and juice conveying pipelines.
- Pharmaceutical industry: ASTM A270 santiary stainless steel seamless tube can be widely used as purified water systems, water for injection (WFI) pipelines, and bioreactors.
- Cosmetics: ASTM A270 santiary stainless steel seamless tube can be used as raw material transportation pipelines and high-purity medium processing pipelines.
- Bioengineering: ASTM A270 santiary stainless steel seamless tube can be widely used in pipeline systems for fermentation tanks and clean fluid systems.
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