ASTMA A53 Black and Hot Dipped Zinc Coated Welded and Seamless Steel Pipe

Product Detail

Scope:
Covers Seamless and Welded, Black and Hot-Dipped Galvanized nominal (average) wall pipe for coiling, bending, flanging and other special purposes and is suitable for welding. Continuous-Welded pipe is not intended for flanging. Purpose for which pipe is intended should be stated on order.



Materials and Manufacture:
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. The weld seam of electric-resistance welded pipe in Grade B shall be heat treated after welding.




Chemical Requirements:

		Type S (seamless)		Type E		Type F
				(electric-    resistance welded)		(furnace-    welded pipe)
		Grade A	Grade B	Grade A	Grade B	Grade A
Carbon max. %		0.25	0.30	0.25	0.30	0.3
Manganese %		0.95	1.2	0.95	1.2	1.2
Phosphorous, max. %		0.05	0.05	0.05	0.05	0.05
Sulfur, max. %		0.045	0.045	0.045	0.045	0.045
Copper, max.%		0.40	0.40	0.40	0.40	0.4
Nickel, max. %		0.40	0.40	0.40	0.40	0.4
Chromium, max. %		0.40	0.40	0.40	0.40	0.4
Molybdenum, max. %		0.15	0.15	0.15	0.15	0.15
Vanadium, max. %		0.08	0.08	0.08	0.08	0.08




Hot-Dipped Galvanizing:
Sets standards for coating of pipe with zinc inside and outside by the hot-dipped process. Weight of coating must not average less than 1.8 oz. per square foot and not less than 1.6 oz. per square foot.



Permissible Variations in Wall Thickness:
The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.



Permissible Variations in Weights per Foot:
Plus or minus 10%



Tensile Requirements:

	Seamless and Electric-resistance-welded		Continuous-Welded
	Grade A	Grade B
Tensile Strength, min., psi	48,000	60,000	45,000
Yield Strength, min., psi	30,000	35,000	25,000




Hydrostatic Testing: 


Hydrostatic inspection test pressures for plain end and threaded and coupled pipe are specified. Hydrostatic pressure shall be maintained for not less than 5 seconds for all sizes of seamless and electric-resistance-weld pipe.




Mechanical Tests Specified:
Tensile Test -- Transverse required on ERW for NPS 8 and large. Sending Test (Cold) -- STD and XS-NPS 2 and under XXS-NPS 1 1/4 and under.

	Degree of Bend	Diameter of Mandrel
For Normal A53 Uses	90	12 x nom dia. of pipe
For Close Coiling	180	8 x nom dia. of pipe

Flattening Test -- NPS 2 and larger STD and XS. (Not required for XXS pipe.)



Lengths:

Standard Weight

Single Random -- 16' - 22'. 5% may be jointers. If Plain Ends -- 5% may be 12' - 16'.

Double Random -- Shortest Length 22', minimum average for order 35'.

Extra Strong and Double Extra Strong

Single Random -- 12' -22'. 5% may be 6' - 12'.

Double Random (XS and lighter) -- Shortest Length 22', minimum average for order 35'.

Lengths longer than single random with wall thicknesses heavier than XS subject to negotiation.




General Information:

Couplings -- Applied handling tight. Couplings, 2" and smaller straight tapped, other sizes taper tapped.

Thread Protection -- Applied to pipe 4" and larger.

End Finish (unless otherwise specified) --

STD or XS, or wall thicknesses less than 0.500 in. (excluding XXS): Plain and beveled

All XXS and wall thicknesses over 0.500 in.: Plain end square cut.

a53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless1




Diameter & Tolerance:
For pipe = NPS 11/2 [DN 40], the outside diameter at any point shall not vary more than 1/64 in. [0.4 mm].
For pipe =NPS 2 [DN 50], the outside diameter shall not vary more than ±1%.




Galvanized
1), Zinc: The zinc used for the coating shall be any grade of zinc conforming to Specification B 6
2), Weight of Coating—The weight of zinc coating shall be not less than 1.8 oz/ft2[0.55 kg/m2] as determined from the average results of the two specimens taken for test in the manner prescribed in 19.5 and not less than 1.6 oz/ft2[0.49kg/m2] for either of these specimens. And testing the weight of zinc according to ASTMB90




Common Uses:
- Low pressure systems
- Structural applications
- Mechanical components
- Bollards
- Casing

 







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