Dn700 Astm A53m Spiral Welded SSAW Steel Pipe ISO 9001

Astm A53m Spiral Welded Sliquid Transport Iso9001 Certificated Saw Steel Pipe

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.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.The steel shall conform to the requirements as to chemical composition given in Table 1 and the chemical analysis shall be in accordance with Test Methods, Practices, and Terminology A751.

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 E1806. The chemical composition thus determined shall conform to the requirements. For tension tests other than transverse weld tension tests, the yield strength corresponding to a permanent offset of 0.2 % of the gage length or to an extension of 0.5 % of the gage length under load, the tensile strength, and the elongation in 2 in. or 50 mm shall be determined, and the tension test results shall conform to the applicable tensile property requirementsgiven.

The minimum hydrostatic test pressure required to satisfy the requirements specified in 8.2 need not exceed 2500 psi [17 200 kPa] for pipe NPS 3 [DN 80] or smaller, or 2800 psi [19 300 kPa] for pipe larger than NPS 3 [DN 80]; however, the manufacturer has the option of using higher test pressures.For all sizes of seamless pipe and electric-resistance-welded pipe, the hydrostatic test pressure shall be maintained for at least 5 s.