ASTM A53/A53M-20.Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless.
ASTM A53/A53M cover seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS 26 [DN 6 to DN 650] (Note 1), inclusive, with nominal wall thickness (Note 2) as given in Table X2.2 and Table X2.3. It shall be permissible to furnish pipe having other dimensions provided that such pipe complies with all other requirements of this specification. Supplementary requirements of an optional nature are provided and shall apply only when specified by the purchaser.
4. Materials and Manufacture
4. I The steel for both seamless and welded pipe shall be made by one or more of the following processes: open-hearth electric-furnace, or basic-oxygen.
4.2 If steels of different grades are sequentially strand cast identification of the resultant transition material is required The steel producer shall remove the transition material by any established procedure that positively separates the grades.
4.3 The weld seam of electric-resistance welded pipe in Grade B shall be heat treated after welding to a minimum o 1000F 540°C so that no untempered martensite remains, or otherwise processed in such a manner that no untempered martensite remains.
4 4 When pipe is cold expanded, the amount of expansion shall not exceed 1V2 of the specified outside diameter of the pipe.
5. Chemical Composition
5.1 The steel shall conform to the requirements as to chemical composition given in Table I and the chemical analysis shall be in accordance with Test Methods. Practices. and Terminology A75 1.
6. Product Anahsis
6. 1 The purchaser is permitted to perform an analysis of two pipes from each lot of 500 lengths. or fraction thereof. Samples for chemical analysis, except for spectrographic analysis. shall be taken in accordance with Practice El806. The chemical composition thus determined shall conform to the requirements given in Table 1.
7. Mechanical Properties
7. 1 Tension Test:
7.1.1 For tension tests other than transverse weld tension tests, the yield strength corresponding to a permanent offset of 0.2 % of the gage length orto an exLension of 0.5 % of the gage length under load, the tensile strength. and the elongation in 2 in. or 50 mm shall he determined, and the tension test results shall conform to the applicable tensile property requirements given in Table 2.
7.1.2 For transverse weld tension tests, the tensile strength shall be determined, and the tension test results shall conform to the applicable tensile strength requirement given in Table 2.
7.1.3 Electric-resistance-welded pipe NPS 8 [DN 200] or larger shall he tested using two transverse test specimens, one taken across the weld and one taken opposite the weld.
7.1.4 Transverse tension test specimens shall he approximately 1 ½ in. [38 mm] wide in the gage length and shall represent the full wall thickness of the pipe from which the test specimens were cut.ASTM A53/A53M-20 pdf free download.