What is ASTM A270？
ASTM A270 is a standard developed by the American Society for Testing and Materials (ASTM). This standard specifies three processes: seamless, welded, and EFW. It is a standard for sanitary-grade piping for austenitic and ferritic stainless steel. It has an extremely high sanitation level and is suitable for processing equipment such as food and dairy products.
ASTM A270 Specifications
Size range: 3mm to 120mm
Wall thickness range: 0.2mm-10mm
Tolerances: Outer diameter deviation ±0.3mm, wall thickness tolerance ±8%
Length: 3-10m
Surface: Polished, free of cracks and defects
Material: 304, 316L
Inspection: 100% eddy current testing
ASTM A270 Dimensions
| Nominal outer diameter(in) | Nominal diameter (DN) | Nominal outer diameter (mm) | W.T. (mm) | Weight (kg/m) |
| 1/2″ | 15 | 20 | 1 | 0.47 |
| 1/2″ | 15 | 20 | 1.5 | 0.69 |
| 1/2″ | 15 | 20 | 2 | 0.89 |
| 3/4″ | 20 | 25 | 1 | 0.59 |
| 3/4″ | 20 | 25 | 1.5 | 0.89 |
| 3/4″ | 20 | 25 | 2 | 1.14 |
| 1″ | 25 | 32 | 1 | 0.77 |
| 1″ | 25 | 32 | 1.5 | 1.14 |
| 1″ | 25 | 32 | 2 | 1.48 |
| 1-1/2″ | 40 | 50 | 1.5 | 1.79 |
| 1-1/2″ | 40 | 50 | 2 | 2.36 |
| 1-1/2″ | 40 | 50 | 2.5 | 2.92 |
| 2″ | 50 | 63 | 2 | 3.01 |
| 2″ | 50 | 63 | 2.5 | 3.73 |
| 2″ | 50 | 63 | 3 | 4.44 |
| 4″ | 100 | 114 | 3 | 8.22 |
| 4″ | 100 | 114 | 4 | 10.85 |
| 4″ | 100 | 114 | 5 | 13.45 |
ASTM A270 Chemical Properties
Dimensional Tolerances – ASTM A270/A270M-24
Wall thickness tolerance
ASTM A270 stipulates that the wall thickness at any point cannot exceed 12.5% of the required wall thickness.
Outside diameter tolerance
The standard specifies different tolerances for outer diameters.
Outer diameter ≤ 25.4，Allowable deviation: ±0.13°
Outer diameter > 25.4° to 50.8°，Allowable deviation: ±0.20°
Outer diameter > 50.8° to 76.2°，Allowable deviation: ±0.25°
Outer diameter > 76.2° to 101.6°，Allowable deviation: ±0.38°
Outer diameter > 101.6° to 139.7°，Allowable deviation: ±0.38°
………
You can contact PANDAPIPE experts to learn more about ASTM A270 allowable deviations.
ASTM A270 Roughness Average
The reason why ASTM A270 is a sanitary standard is that it has strict requirements for the average surface roughness, making the surface smooth and flat, easy to clean, and not conducive to bacterial growth.
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- The ASTM A270 standard specifies a surface Ra value of no higher than 0.8 μm.
- For applications requiring higher hygiene standards, the Ra value is controlled below 0.4 μm or even 0.2 μm.
This standard specifies two polishing methods: mechanical polishing and electrolytic polishing
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- Mechanical polishing: Polishing is performed using abrasives. Different types of grinders produce varying degrees of finish.
- Electrolytic polishing: Utilizing the principles of electrochemical processing, it produces a bright, reflective surface with enhanced corrosion resistance and cleanliness.
ASTM A270 Manufacturing Process
ASTM A270 standard covers three processes: ERW, SMLS, and EFW
ERW
This is a very common manufacturing process that uses resistance welding technology. The pipe is first heated and then pressurized for welding.
SMLS
Seamless pipes are also very common in our daily use. They are integral pipes formed by extrusion and have no welding points.
HLD
This process is not common in our daily life. Its full name is rapid cooling treatment pipe. Its core is to perform cold processing before retreating, so that the pipe can be cooled rapidly, so that the wall thickness and weld thickness shrinkage rate is not less than 35%.
If you have specific requirements for pipe RA, you can contact a PANDAPIPE expert by clicking below. PANDAPIPE can customize pipes with different RA to suit your requirements. If you have other pipe needs or questions, please click below to contact us. PANPIPE is a company that integrates production and sales, and is a company you can trust.
A270 Applicable Scenarios
ASTM A270 standard is mainly used in environments with sanitary surface quality and easy cleanability requirements.
1. Dairy processing
Specific equipment: widely used in milk tanks, pipelines, pasteurization equipment, etc.
2. Pharmaceutical industry
Specific equipment: including liquid medicine pipelines, fermentation tanks, sterilization equipment, etc.
3. Bioengineering and laboratories
Specific equipment: used for culture medium pipelines, reactors, purification equipment, etc.
