What is ASTM 139 steel
ASTM A139 welded steel pipe specification covers five grades of electric-fusion (arc)-welded straight-seam or helical-seam steel pipe. Pipe of NPS 4 and larger with nominal (average) wall thickness of 1.0 in. or 25.4 mm and less are covered.
What is the difference between ASTM A53 and A139?
ASTM A139 is used for low-to-medium pressure applications, while ASTM A53 is designed for oil, gas, and mechanical systems.
What is the specification of A139
This specification covers five grades of electric-fusion (arc)-welded straight-seam or spiral-seam steel pipe in 4" to 92" inclusive with wall thickness up to 1 " inclusive.
What is ASTM A139 Steel Pipe Dimensions
| NB Sizes | Sch 5 | Sch 10 | Sch 40 | Sch 80 | Sch 160 |
| 1/2 | ✔ | ✔ | ✔ | ✔ | |
| 3/4 | ✔ | ✔ | ✔ | ✔ | |
| 1 | ✔ | ✔ | ✔ | ✔ | |
| 1.25 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 1.5 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 2 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 2.5 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 3 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 3.5 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 4 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 5 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 6 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 8 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 10 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 12 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 14 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 16 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 18 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 20 | ✔ | ✔ | ✔ | ✔ | ✔ |
| 22 | ✔ | ✔ | ✔ | ✔ | |
| 24 | ✔ | ✔ | ✔ | ✔ |