ASTM A269 is a standard specification for seamless and welded austenitic stainless steel tubing used for general service in low or high-temperature environments. It covers various grades, such as TP304, TP304L, TP316, and TP316L, defining their chemical composition and mechanical properties like tensile strength, yield strength, and hardness. This standard also mandates specific tests to ensure the tubing meets the requirements for corrosion resistance and other applications.
What is the ASTM A269 equivalent to?
ASTM A-269 & Its equivalent ASME, DIN & EN Standard. 202, 304, 304L, 304H, 304LN, 309S, 310S, 316, 316L, 316H, 316Ti, 316LN, 317L, 321, 321H, 347, 347H, 904L, SMO 254, ALLOY 254, 6MO, 6MOLY, UNS S31254 ETC.
| Stainless Steel Coil Tube | C | Mn | P | S | Si | Mo | Ni |
|---|---|---|---|---|---|---|---|
| TP316L | 0.035 | 2 | 0.045 | 0.03 | 1 | 2.0-3.0 | 10.0-14.0 |
| TP304 | 0.08 | 2 | 0.045 | 0.03 | 1 | - | 8.0-11.0 |
| TP316 | 0.08 | 2 | 0.045 | 0.03 | 1 | 2.0-3.0 | 11.0-14.0 |
| TP304L | 0.035 | 2 | 0.045 | 0.03 | 1 | - | 8.0-13.0 |
What is the yield strength of ASTM A269?
The yield strength specified in ASTM A269 varies depending on the specific grade. Common grades such as TP304 and TP316 have a minimum yield strength of 30 ksi (205 MPa), while TP304L and TP316L have a minimum yield strength of 25 ksi (170 MPa). ASTM A269 is the standard for stainless steel tubing, therefore its exact yield strength depends on the material composition and heat treatment process.
| Material | Tensile Strength | Yield Strength | Elongation %, Min |
|---|---|---|---|
| Ksi (MPa), Min. | Ksi (MPa), Min. | ||
| TP316 | 75(515) | 30(205) | 35 |
| TP304L | 70(485) | 25(170) | 35 |
| TP316L | 70(485) | 25(170) | 35 |
| TP304 | 75(515) | 30(205) | 35 |
| Weight /m (kg/m) | Size (OD * W.T) |
|---|---|
| 3.94 | 50.8 mm * 3 mm |
| 2.21 | 38.1 mm * 2 mm |
| 0.77 | 19 mm * 1 mm |
| 1.37 | 25.4 mm * 1.5 mm |
| 0.103 | 6.35 mm * 0.25 mm |
| 0.32 | 12.7 mm * 0.5 mm |
| 0.27 | 10 mm * 0.5 mm |
| 0.53 | 15.88 mm * 0.75 mm |
| Tolerance% | NPS | |
|---|---|---|
| – | + | |
| 12.5 | 15.0 | 3~18,t/D>5% |
| 12.5 | 17.5 | ≥ 20,welded |
| 12.5 | 20.0 | 1/8-2 1 /2 |
| 12.5 | 22.5 | 3~18,t/D≤ 5% |
| 12.5 | 15.0 | ≥ 20,smls,t/D>5% |
| 12.5 | 22.5 | ≥ 20,smls,t/D≤ 5% |
| Material | HeatTreatment | Temperure º F(º C) |
|---|---|---|
| A269 316L | Solution | 1900(1040) |
| A269 304 | Solution | 1900 (1040) |
| A269 304L | Solution | 1900 (1040) |
| A269 316 | Solution | 1900(1040) |
ASTM A269 Pressure Rating
ASTM A269 pressure ratings are not single values but depend on the specific properties of the pipe material, such as material grade (e.g., 304L, 316), wall thickness, and outer diameter. The maximum permissible working pressure is calculated using the formula P = 2St/D, where St is the permissible stress (e.g., 20,000 psi for many grades at room temperature), t is the minimum wall thickness, and D is the outer diameter. For example, a typical rated pressure for 304L stainless steel pipe with an outer diameter of 3/4 inch and a wall thickness of 0.049 inches is 2450 psi, with a temperature range of -20 to 100 °F.
What is the test for ASTM A269?
Tubing shall be subjected to either hydrostatic test or nondestructive electric test to test for leaks or defects. Welded tubes have to resist flanging without cracking demonstrating weld integrity .
What is the difference between ASTM A269 and A249?
ASTM A249 is for welded austenitic steel tubes used in critical applications like boilers and heat exchangers, requiring more extensive testing and specific manufacturing processes. ASTM A269 covers both seamless and welded austenitic stainless steel tubing for general service, requiring less stringent mechanical testing.
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