ASTM A672 Grade B60, C65 Pipe Specification
ASTM A672 is the standard for electric welded steel pipes for medium and high temperature pressure applications, developed by the American Society for Testing and Materials. B60 and C65 are its material grades:
Grade B60: Economical carbon manganese steel, minimum yield strength 60 ksi (414 MPa)
Grade C65: Medium-high strength carbon manganese steel, minimum yield strength 65 ksi (450 MPa)
Forced normalizing treatment (refines grain size and improves high-temperature performance)
Class (default CL22: local non-destructive testing)
Chemical Requirements for ASTM A672 Material:
| C | P | S | ||||||
|---|---|---|---|---|---|---|---|---|
ASTM A671, A672 |
-/A45 | -/0.17 | - | 0.98 | 0.035 | 0.035 | - | A671/ A672 |
| -/A50 | -/0.22 | - | ||||||
| CA55/A55 | 0.28 | - | ||||||
| -/B55 | -/0.20 | 0.13 ~0.45 |
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| CB60/B60 | 0.24 | |||||||
| CB65/B65 | 0.28 | |||||||
| CB70/C70 | 0.31 | 1.30 | ||||||
| -/C55 | -/0.18 | 0.55 ~0.98 |
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| CC60/C60 | 0.21 | |||||||
| CC65/C65 | 0.24 | 0.79 ~1.30 |
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| CC70/C70 | 0.27 | |||||||
Mechanical Properties of ASTM A672 Welded Pipes:
| Welding point tensile strength (N/mm2) | |||||||
|---|---|---|---|---|---|---|---|
| Yield point (N/mm2) | Tensile Stregth (N/mm2) | ||||||
| Pipes for pressure service ASTM A671, A672 | -/A45 | -/165 | -/310~450 | - | -/30 | -/310~450 | A671/ A672 |
| -/A50 | -/185 | -/345~485 | -/28 | -/345~485 | |||
| CA55/A55 | 205 | 380~515 | 27 | 380~515 | |||
| -/B55 | -/205 | -/380~515 | -/27 | -/380~515 | |||
| CB60/B60 | 220 | 415~550 | 25 | 415~550 | |||
| CB65/B65 | 240 | 450~585 | 23 | 450~585 | |||
| CB70/B70 | 260 | 485~620 | 21 | 485~620 | |||
| -/C55 | -/205 | -/380~515 | -/27 | -/380~515 | |||
| CC60/C60 | 220 | 415~550 | 25 | 415~550 | |||
| CC65/C65 | 240 | 450~585 | 23 | 450~585 | |||
| CC70/C70 | 260 | 485~620 | 21 | 485~620 | |||
Charpy V-Norch Test (For pipe with nominal wall thickness of 1/2 inch and greater)
Straight Beam Ultrasonic Examination of Flat Plate-UT1
Straight Beam Ultrasonic Examination of Flat Plate-UT2
Angle-Beam Ultrasonic Examination (Plate less than 2 inch 50.8mm Thick)-UT3
