ASTM A192 Seamless Carbon Steel Boiler Tube/Pipe
ASTM A192 standard specification for seamless carbon steel boiler tubes for high-pressure service.
his specification covers minimum-wall-thickness, seamless carbon steel boiler and superheater tubes for high-pressure service.
1.2 The tubing sizes and thicknesses usually furnished to this specification are 1/2 in. to 7 in. [12.7 to 177.8 mm] outside diameter and 0.085 to 1.000 in. [2.2 to 25.4 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.
1.3 Mechanical property requirements do not apply to tubing smaller than 1/8 in. [3.2 mm] inside diameter or 0.015 in. [0.4 mm] thickness.
This guide covers standard specifications for minimum-wall-thickness, seamless carbon steel boiler and superheater tubes for high-pressure service. The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, and silicon. The tubes shall have a hardness number not exceeding a specific value. The following mechanical tests shall be conducted, namely: flattening test; flaring test; hardness test; and hydrostatic test.
ASTM A192 Chemistry composition
|
C, %
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Mn, %
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Si, %
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P, %
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S, %
|
|
0.06-0.18
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0.27-0.63
|
0.25 max
|
0.035 max
|
0.035 max
|
ASTM A192 Mechanical properties
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Tensile Strength , MPa
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Yield Strength , MPa
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Elongation, %
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Hardness, HB, WT≥5.1mm
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Hardness, HRB, WT＜5.1mm
|
|
325 min
|
180 min
|
35 min
|
137 max
|
77 max
|
ASTM A192 Seamless Tube Outside Diameter and Wall thickness Tolerance
| Standard | Outside Diamater | OD Tolerance | Wall Thickness | Wall Thickness Tolerance |
| ASTM A179 ASTM A192 ASTM A210 |
≤25.4mm | ±0.10mm | All Thickness | +20% -0% |
| 25.4mm-38.1mm | ±0.15mm | +20% -0% | ||
| 38.1mm-50.8mm | ±0.20mm | All Thickness | +22% -0% | |
| 50.8mm-63.5mm | ±0.25mm | +22% -0% | ||
| 63.5mm-76.2mm | ±0.30mm | +22% -0% | ||
| 76.2mm-101.6mm | ±0.38mm | +22% -0% | ||
| 101.6mm-190.5mm | +0.38mm -0.64mm | +22% -0% | ||
| 190.5mm-228.6mm | +0.38mm -1.14mm | +22% -0% |
ASTM A192 Seamless Tube Cut Length Tolerance
| Cold-Finished Seamless Tubes | |||
| Outside Diameter,In. (mm) | Cut Length, in. (mm) | ||
| Over (+) | Under (-) | ||
| All Sizes | 3⁄16 [5] | 0 [0] | |
| Under 2 [50.8] | 1⁄8 [3] | 0 [0] | |
| 2 [50.8] and over | 3⁄16 [5] | 0 [0] | |
| Under 2 [50.8] | 1⁄8 [3] | 0 [0] | |
| 2 [50.8] and over | 3⁄16 [5] | 0 [0] | |
| These permissible variations in length apply to tubes before bending. They apply to cut lengths up to and including 24 ft [7.3 m]. For lengths greater than 24 ft [7.3 m], the above over-tolerances shall be increased by 1⁄8 in. [3 mm] for each 10 ft [3 m] or fraction thereof over 24 ft or 1⁄2 in. [13 mm], whichever is the lesser. | |||
ASTM A192 Seamless tubes Hydrostatic Test Pressures
Each tube shall be subjected to the hydrostatic pressure test, or instead of this test, a nondestructive test may be used when specified by the purchaser.
| Hydrostatic Test Pressures | |
| Outside Diameter of Tube, in. [mm] | Hydrostatic Test Pressure, psi [MPa] |
| Under 1 [25.4] | 1000 [7] |
| 1 to 11⁄2 [25.4 to 38.1], excl | 1500 [10] |
| 11⁄2 to 2 [38.1 to 50.8], excl | 2000 [14] |
| 2 to 3 [50.8 to 76.2], excl | 2500 [17] |
ASTM A192 Seamless Tubes Flattening Test
One flattening test shall be made on specimens from each end of two tubes selected from each lot or fraction thereof.
ASTM A192 Seamless Tubes Flaring Test
One flaring test shall be made on specie- men from each end of two tubes selected from each lot or fraction thereof. These tubes shall be selected apart from those used for the flattening test.
Note:
- Mill test certificates will be issued according to EN10204.3
- The tubes Shall be Seamless, and the testing shall be as per A 450 / A450M.
Standard: ASTM A192
Steel Grades: A192
Size Range: OD:12.7mm TO 220mm. WT: 2.11mm To 25.4mm
Manufacturing Process : Cold Drawn , Cold Rolled
Application:Tubes are used in boiler ,heat exchanger ,and superheater Etc.
Packing: External Black Painting ,Both Side With End Caps,
