What material is ASTM A270 TP304?
What is ASTM A270 TP304 material?
ASTM A270 TP304 refers to a specific grade of sanitary stainless steel tubing commonly used in the food, beverage, dairy, and pharmaceutical industries. It belongs to the ASTM A270 specification, which covers seamless and welded austenitic stainless steel tubing for sanitary applications. The TP304 designation means the tubing is made from Type 304 stainless steel, a widely used grade with excellent corrosion resistance and formability.
Equivalent Standards to ASTM A270 TP304
| Standard | Equivalent Grade |
|---|---|
| EN/DIN | 1.4301 (X5CrNi18-10) |
| JIS | SUS304 |
| ISO | 304 |
| UNS Number |
S30400 |
What is the chemical composition of ASTM A270 TP304?
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 18.0–20.0 |
| Nickel (Ni) | 8.0–11.0 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
What are the mechanical properties of ASTM A270 TP304?
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa (75 ksi) |
| Yield Strength | ≥ 205 MPa (30 ksi) |
| Elongation | ≥ 35% |
| Hardness (HRB) | ≤ 90 |
A270 TP304 tubing Surface Finishes
ASTM A270 tubing must meet hygienic surface finish standards:
Mechanical Polish (MP)
Electropolish (EP)
Bright Annealed (BA)
Roughness average (Ra) is typically ≤ 0.8 μm for hygienic applications. Specific requirements may be stricter in pharmaceutical or biotech use.
What are the typical applications of A270 TP304 tubing?
Food and beverage processing
Dairy pipelines
Pharmaceutical manufacturing
Biotech and lab equipment
Clean-in-place (CIP) systems
Brewery and winery operations
Its smooth surface, corrosion resistance, and compliance with sanitary standards make it ideal for industries where hygiene, cleanliness, and corrosion resistance are critical.
ASTM A270 TP304 vs TP316: What's the Difference?
| Feature | TP304 | TP316 |
|---|---|---|
| Molybdenum Content | None | 2–3% |
| Corrosion Resistance | Good | Better (chloride-resistant) |
| Cost | Lower | Higher |
| Applications | General sanitary use | Harsh environments (salt, acids) |
If your application involves chloride-rich or aggressive chemicals, TP316 may be more suitable than TP304.
