ASTM A192 / A192M is the standard applicable to seamless carbon steel boiler tubes for high-pressure service
ASTM A192 seamless steel tube 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.
ASTM A192 seamless steel tubes 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.
ASTM A192 Referenced Documents:
ASTM A450 / A450M Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes.
Standard: ASTM A192 / ASME SA 192
Description Name: ASME SA 192 / ASTM A192 boiler pipes; A192 pipes; A192 carbon steel tube; ASTM A192 seamless tubing; ASTM A192 carbon steel pipe; SA192 SEAMLESS PIPE; ASTM A192 cold drawn seamless steel tubes; ASTM A192 pipes and tubing; carbon steel tube; Seamless steel tube; steel tube.
Size: 1⁄2 in. to 12 in. [12.7 to 304.8 mm]
Schedule: 1.5mm-35mm
Shape: Round
Production type: Hot finished and cold finished.
Length: Single random length/ Double random length or as customer’s actual request max length is 27m.
Grade: A192 / SA192
| Chemical Components (%) | |||||||
| C | Si | Mn | P | S | Mo | Cr | V |
| 0.06-0.18 | ≤0.25 | 0.27-0.63 | ≤0.035 | ≤0.035 | / | / | / |
| Mechanical properties | |||
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) | Hardness (HRB) |
| ≥325 | ≥180 | ≥35 | ≤77 |
| Seamless, Cold-Finished Tubes | ||
| Outside Diameter
In. (mm) |
Wall thickness Tolerance % | |
| Over (+) | Under (-) | |
| 1 ½ (38.1) and under | 20 | 0 |
| Over 1½ (38.1) | 22 | 0 |
| Cold-Finished Seamless Tubes | ||
| Outside Diameter
In. (mm) |
Permissible Variations In. (mm) | |
| Over (+) | Under (-) | |
| Under 1 (25.4) | 0.004 (0.1) | 0.004 (0.1) |
| 1 to 1 ½ (25.4 to 38.1), Incl | 0.006 (0.15) | 0.006 (0.15) |
| Over 11⁄2 to 2 [38.1 to 50.8], Excl | 0.008 (0.2) | 0.008 (0.2) |
| 2 to 21⁄2 [50.8 to 63.5], Excl | 0.010 (0.25) | 0.010 (0.25) |
| 21⁄2 to 3 [63.5 to 76.2], Excl | 0.012 (0.3) | 0.012 (0.3) |
| 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. | |||
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] |
One flattening test shall be made on specimens from each end of two tubes selected from each lot or fraction thereof.
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.
Orders for ASTM A192 Seamless carbon steel tubes should include the following, as required, to describe the desired material adequately:
