What is ASTM A269 material?
ASTM A269 standard covers stainless steel tubing of nominal wall thickness intended for general corrosion resistance, low temperature, or high temperature environments, and includes mechanical properties and testing requirements. Tubing conforming to this standard typically has the following dimensions and wall thicknesses: inner diameter of 6.4 mm or greater and nominal wall thickness of 0.51 mm or greater, ensuring suitability for general corrosion resistance, low temperature, and high temperature environments.
What is ASTM A269 TP304 stainless steel round pipe?
ASTM A269 TP304 stainless steel round tube is an austenitic stainless steel seamless or welded round tube widely used in corrosion-resistant, low-to-medium pressure fluid transportation and high-temperature service applications.
TP304 (UNS S30400) is a general-purpose 18-8 stainless steel with excellent corrosion resistance and machinability. It can be seamless (cold-drawn/hot-rolled) or welded (e.g., ERW) and undergoes solution heat treatment (water quenching above 1040°C) to ensure resistance to intergranular corrosion. Surface finishes include pickling, bright annealing (BA), mechanical polishing (MP), and electropolishing (EP) to meet the high cleanliness requirements of food, pharmaceutical, and other industries.
What is the composition of ASTM A269 TP304?
ASTM A269 TP304 is a standard grade of austenitic stainless steel used to manufacture pipes that are corrosion-resistant, low-temperature resistant, or high-temperature resistant. Its chemical composition consists primarily of 18% chromium and 8% nickel, hence it is also known as the classic "18/8" stainless steel.
| ASTM A269 | C(Max) | Mn | Si(Min) | P(Max) | Chromium | Ni | S(Max) |
|---|---|---|---|---|---|---|---|
| TP304 | 0.08 | 2.00 | 1.00 | 0.045 | 18.0-20.0 | 8.0-11.0 | 0.030 |
Mechanical Properties of ASTM A269 TP 304 Stainless Steel Seamless Tubes
|
Density |
8.0 g/cm3 |
|
Melting Point |
1400 °C (2550 °F) |
|
Tensile Strength |
Psi – 75000 , MPa – 515 |
|
Yield Strength (0.2%Offset) |
Psi – 30000 , MPa – 205 |
|
Elongation |
35 % |
ASTM A269 TP 304 Stainless Steel Tubes Physical Properties
|
Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion (m/m/0C) |
Thermal Conductivity (W/m.K) |
Specific Heat 0-1000C (J/kg.K) |
Electrical Resistivity (n.m) |
|||
|---|---|---|---|---|---|---|---|---|---|
|
0-1000C |
0-3150C |
0-5380C |
at 1000C |
at 5000C |
|||||
|
304/H |
8000 |
193 |
17.2 |
17.8 |
18.4 |
16.2 |
21.5 |
500 |
720 |
Tolerance of SA 269 TP 304 Welded Tube
| Size Inches |
Tolerances,Inches | |||
|---|---|---|---|---|
| Outside Dia, Inches |
Wall | Ovality 2 x tol.,In. |
Cut Length (b),In. |
|
| Over 1-1/2 to 3-1/2 | ±0.010 | ±10% | –0.095 | +3/16 –0 |
| Over 3-1/2 to 5-1/2 | ±0.015 | ±10% | –0.150 | |
| Over 5-1/2 to 8 | ±0.030 | ±10% | -- | |
| Less than 1/2 | ±0.005 | ±15% | -- | +1/8 –0 |
| Over 1/2 to 1-1/2 | ±0.005 | ±10% | –0.065 | |
ASME SA 269 TP 304 Seamless Tubing Pressure Rating
| OD (Inches) | Wall Thickness (0.028") | Wall Thickness (0.035") | Wall Thickness (0.049") | Wall Thickness (0.065") | Wall Thickness (0.083") | Wall Thickness (0.095") |
| 1/8" | 8,500 | 10,800 | - | - | - | - |
| 1/4" | 4,000 | 5,100 | 7,500 | 10,200 | - | - |
| 3/8" | 2,600 | 3,300 | 4,800 | 6,500 | - | - |
| 1/2" | 1,900 | 2,500 | 3,500 | 4,800 | 6,200 | - |
| 5/8" | - | 1,900 | 2,700 | 3,700 | 4,800 | - |
| 3/4" | - | 1,600 | 2,300 | 3,100 | 4,000 | 4,600 |
| 1" | - | - | 1,700 | 2,300 | 2,900 | 3,400 |
| 1-1/4" | - | - | - | 1,800 | 2,300 | 2,700 |
| 1-1/2" | - | - | - | 1,500 | 1,900 | 2,200 |
Applications:
Fluid transport systems: Pipelines for media such as water, gas, and oil.
Heat exchange equipment: Heat transfer tubes in heat exchangers, condensers, and boilers.
Food and pharmaceutical industries: Widely used in dairy, beverage, and aseptic production lines.
Energy and environmental protection: Key piping components in nuclear power, solar energy, and flue gas treatment systems.
Inspection and Acceptance Requirements
Mechanical Performance Tests: Flaring test (seamless pipe), flanging test, and reverse flattening test (welded pipe).
Hardness Requirements: Brinell hardness (HBW) typically ≤ 250.
Non-destructive Testing: Each steel pipe must undergo a hydrostatic test or eddy current/ultrasonic testing to ensure pressure resistance.
Packaging and Marking:
Packaging shall be in bundles or laminated wooden crates, wrapped in plastic, and appropriate protective measures shall be taken to ensure seaworthiness for transport or as required.
Marking shall comply with the provisions of A1016/A1016M specifications and shall include whether the pipes are hot-worked or cold-worked, including but not limited to: standard, grade, size, furnace number, and batch number.
