ASTM A139 Grade C welded steel pipe/tube
ASTM A139 specification covers five grades of electric-fusion (arc)-welded straight-seam or helical-seam steel pipe.
ASTM A139 grade C welded pipe/tube is intended for conveying liquid, gas, or vapor.
The size of A139 Grade C steel pipe/tube
ERW; outer diameter:21.3-660mm thickness:6-25mm
LSAW; outer diameter:325-1524mm thickness:6-50mm
SSAW: outer diameter:219-3200mm thickness:5-25mm
A139 grade C chemical composition
| Element | Carbon | Manganese | Phosphorus | Sulfur |
| Grade C | 0.28 | 1.20 | 0.035 | 0.035 |
ASTM A139 grade C welded steel pipe/tube mechanical properties
| Grade C | |
| Tensile strength, min, ksi (MPa) | 60 (415) |
| Yield strength, min, ksi (MPa) | 42(290) |
| Elongation in 2 in. or 50 mm, min, %: | |
| Basic minimum elongation for walls5
⁄16in. (7.9 mm) and over in |
25 |
| thickness, longitudinal strip tests | |
| For longitudinal strips tests, a deduction for each1
⁄32-in. (0.8-mm) |
1.25
|
| decrease in wall thickness below5
⁄16in. (7.9 mm) from the basic minimum elongation of the following percentage A |
|
| Elongation in 8 in. (203.2 mm), in min, %
B,C |
1 500 000 specified tensile strength (psi) |
The table below gives the computed minimum values.
B
For wall thicknesses1
⁄2in. (12.7 mm) and greater, the elongation may be taken in 8 in. (203.2 mm).
C
The elongation in 8 in. (203.2 mm) need not exceed 30 %.
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