we have obtained ISO 9001, ISO 14001, ISO 45001, CE, AAA-level credit rating certification, etc.
ASTM A139/A139M -04(Reapproved 2015) standard specification for Electric-Fusion(Arc)-Welded Steel Pipe(NPS 4 and Over).This specification covers five grads 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.(25.4mm) and less are covered.The pipe is intended for conveying liquid,gas or vapor.
Chemical Composition
|
Element |
Composition, max,% |
||||
|
Grade A |
Grade B |
Grade C |
Grade D
|
Grade E |
|
|
Carbon |
0.25 |
0.26 |
0.28 |
0.30 |
0.30 |
|
Manganese |
1.00 |
1.00 |
1.20 |
1.30 |
1.40 |
|
Phosphorus |
0.035 |
0.035 |
0.035 |
0.035 |
0.035 |
|
Sulfur |
0.035 |
0.035 |
0.035 |
0.035 |
0.035 |
Tensile Requirements
|
|
Grade A |
Grade B |
Grade C |
Grade D |
Grade E |
|
Tensile strength, min, ksi [MPa] |
48 [330] |
60 [415] |
60 [415] |
60 [415] |
66 [455] |
|
Yield strength, min, ksi [MPa] |
30 [205] |
35 [240] |
42 [290] |
52 [360] |
|
|
Elongation in 2 in. or 50 mm, min, %: |
|
|
|
|
|
|
Basic minimum elongation for walls in. [7.9 mm] and over in |
35 |
30 |
25 |
23 |
22 |
|
thickness, longitudinal strip tests |
|
|
|
|
|
|
For longitudinal strips tests, a deduction for eachin. [0.8-mm] |
1.75' |
1.5” |
1.25 |
1.50 |
2.0 |
