Standard: ASTM A252
Application of ASTM A252 ERW Steel Pipe:
Pipe ordered under this specification is for 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.
Manufacturing Process of ASTM A252 ERW Steel Pipe:
By electric resistance welded
Details of ASTM A252 ERW Steel Pipe We can supply:
Manufacture: Carbon ERW Steel Pipe
Size: O.D.: 168～700mm W.T.: 2～20mm
Grade: Gr1, Gr2, Gr3
Length: 6M or specified length as required.
Ends: Plain End, Beveled End.
The steel shall contain no more than 0.050 % phosphorous.
|Grade 1||Grade 2||Grade 3|
|Tensile strength, min, psi (MPa)||50 000 (345)||60 000 (415)||66 000 (455)|
|Yield point or yield strength, min, psi(MPa)||30 000 (205)||35 000 (240)||45 000 (310)|
|Basic minimum elongation for nominal wall thicknesses %6 in. (7.9 mm) or more:Elongation in 8 in. (203.2 mm), min, % Elongation in 2 in. (50.8 mm), min, %||1830||1425||...20|
|For nominal wall thicknesses less than %6 in. (7.9 mm), the deduction from the basic minimum elongation in 2 in. (50.08 mm) for each Vzi - in. (0.8 mm) decrease in nominal wall thickness below %6 in. (7.9 mm), in percentage points||1.5A||1.25A||1.0A...|
Table 2 gives the computed minimum values:
|Calculated Minimum Elongation Values|
|Nominal Wall Thickness||Elongation in 2 in. (50.8 mm), min, %|
|in.||mm.||Grade 1||Grade 2||Grade 3|
|The above table gives the calculated minimum elongation values for various nominal wall thicknesses. Where the specified nominal wall thickness is intermediate to those shown above, the minimum elongation value shall be determined as follows:Grade:1 E=48t+15.002 E=40t+12.503 E=32t+10.00 where: E = elongation in 2 in., %, andt = specified nominal wall thickness, in.|
Tolerance of outside diameter, wall thickness, length and weight:
The outside diameter of pipe piles shall not vary more than ±1% from the specified outside diameter.
The wall thickness at any point shall not be more than 12.5% under the specified nominal wall thickness.
Pipe piles shall be furnished in single random lengths, double random lengths, or in uniform lengths as specified in the purchase order, in accordance with the following limits:
a. Single random lengths 16 to 25ft (4.88 to 7.62mm), inch
b. Double random lengths Over 25ft (7.62m) with a minimum average of 35ft (10.67m)
c. Uniform lengths length as specified with a permissible variation of ±1 in.
Each length of pipe pile shall be weighed separately and its weight shall not vary more than 15% over or 5% under its theoretical weight, calculated using its length and its weight per unit length.
d. Manufacturer’s name or its identifying brand
e. Dimensions(nominal diameter and nominal wall thickness,length and weight per unit length )
f. Heat number
g. The process of manufacture(seamless)
i. Specification designation
Packing for ASTM A252 ERW Steel Pipe:
a. Bare pipe, black coating, etc
b. 6" and below sizes In bundles with two cotton slings, other sizes in loose;
c. Both ends with end protectors;
d. Plain end, bevel end