ASTM A252 Structural Steel Pipe for piling and structural
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ASTM A252 Structural Steel Pipe
Standard: ASTM A252:2010
COVERAGE of ASTM A252 Structural Steel Pipe:
This specification covers nominal(average)wall steel pipe piles of cylindrical shape and applies to pipe piles in which the steel cylinder acts as a permanent load-carrying member,or as a shell to form cast-in-place concrete piles.
Application of ASTM A252 Structural Steel Pipe:
For buildings, pile structure.
Main Steel Grade of ASTM A252 Structural Steel Pipe:
Grade 1,Grade 2,Grade 3
Pipe type of ASTM A252 Structural Steel Pipe:
HFW,SAW
Size of ASTM A252 Structural Steel Pipe:
HFW(1.315in～26.000")
SAW(8.625in～84.000")
Chemical Composition of ASTM A252 Structural Steel Pipe:
| Composition, % |
Grade 1
|
Grade 2
|
Grade 3
|
| C, max |
0.26
|
0.26
|
0.26
|
| Si, max |
0.45
|
0.45
|
0.45
|
| Mn, max |
1.60
|
1.60
|
1.60
|
| P, max |
0.050
|
0.050
|
0.050
|
| S, max |
0.030
|
0.030
|
0.030
|
Mechanical properties of ASTM A252 Structural Steel Pipe: >
|
Grade 1
|
Grade 2
|
Grade 3
|
|
| Minimum Yield strength ReH MPa |
205
|
240
|
310
|
| Tensile strength Rm MPa |
345
|
415
|
455
|
| Minimum elongation A % |
30
|
25
|
20
|
Dimension Tolerances of ASTM A252 Structural Steel Pipe: >
| Outside dimensions |
±1%
|
| Thickness |
-12.5%
|
| Out-of-roundness |
2% for hollow sections having a diameter to thickness ratio not exceeding 100
|
| Straightness |
0.2% of total length and 3mm over any 1m length
|
| Mass(m) per unit length |
-5%,+15%
|
Nondestructive Inspection of ASTM A252 Structural Steel Pipe:
All steel pipe weld length should be tested using UT or RT
ASTM A252 Seamless Steel Cylinder Pipe
A252 seamless or welded steel pipe is of nomal wall thickness cylinder pipe, it is usually produced in cylindrical shape. surface imperfections exceeding 25% deep is defined as defect. Otherwise shall be repaired by welding.
MECHANICAL PROPERTIES For A 252:
| Grade 1 | Grade 2 | Grade 3 | |
|---|---|---|---|
| Tensile Strength, min, psi | 50,000 | 60,000 | 66,000 |
| Yield Strength | 30,000 | 35,000 | 45,000 |
CHEMICAL REQUIREMENTS FOR A252:
| Phosphorus | |
| Seamless and ERW Welded |
Max% 0.050 |
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