| Specifications |
A/SA53 |
NPS 1/4" - 30" |
Schedules 10 through 160, STD, XH and XXH |
Scope
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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. |
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Materials and Manufacture
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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. |
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Chemical
Requirements
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Type S
(seamless) |
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Type E |
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Type F |
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(electric-
resistance welded) |
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(furnace-
welded pipe) |
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Grade A |
Grade B |
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Grade A |
Grade B |
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Grade A |
| Carbon max. % |
0.25 |
0.30 |
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0.25 |
0.30 |
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0.3 |
| Manganese % |
0.95 |
1.2 |
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0.95 |
1.2 |
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1.2 |
| Phosphorous, max. % |
0.05 |
0.05 |
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0.05 |
0.05 |
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0.05 |
| Sulfur, max. % |
0.045 |
0.045 |
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0.045 |
0.045 |
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0.045 |
| Copper, max.% |
0.40 |
0.40 |
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0.40 |
0.40 |
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0.4 |
| Nickel, max. % |
0.40 |
0.40 |
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0.40 |
0.40 |
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0.4 |
| Chromium, max. % |
0.40 |
0.40 |
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0.40 |
0.40 |
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0.4 |
| Molybdenum, max. % |
0.15 |
0.15 |
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0.15 |
0.15 |
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0.15 |
| Vanadium, max. % |
0.08 |
0.08 |
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0.08 |
0.08 |
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0.08 |
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Hot-Dipped
Galvanizing
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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. |
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Permissible Variations in
Wall Thickness
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The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified. |
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Permissible Variations in
Weights per Foot
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Plus or minus 10% |
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Permissible Variations in
Outside Diameter
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Outside Diameter at any point shall not vary from standard specified more than: |
| For NPS 1 1/2 and Smaller Sizes |
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For NPS 2 and Larger Sizes |
| 1/64" |
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1/32" under |
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1% over |
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1%under |
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Tensile Requirements
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Seamless and Electric-resistance-welded |
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Continuous-Welded |
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Grade A |
Grade B |
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| Tensile Strength, min., psi |
48,000 |
60,000 |
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45,000 |
| Yield Strength, min., psi |
30,000 |
35,000 |
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25,000 |
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Number of
Tests Required
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Seamless and Electric-Resistance-Welded -- Bending, flattening, tensile on one length of pipe from each lot of 500 lengths or less of a size. |
| Continuous-Weld -- Bending, flattening, tensile |
| NPS 1 1/2 & smaller |
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NPS 2 & larger |
| one / 25 tons |
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one / 50 tons |
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Hydrostatic
Testing
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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. |
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Mechanical Tests Specified
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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. |
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Degree of Bend |
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Diameter of Mandrel |
| For Normal A53 Uses |
90 |
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12 x nom dia. of pipe |
| For Close Coiling |
180 |
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8 x nom dia. of pipe |
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| Flattening Test -- NPS 2 and larger STD and XS. (Not required for XXS pipe.) |
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Lengths
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| Standard Weight |
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Single Random -- 16' - 22'. 5% may be jointers. If Plain Ends -- 5% may be 12' - 16'. |
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Double Random -- Shortest Length 22', minimum average for order 35'. |
| Extra Strong and Double Extra Strong |
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Single Random -- 12' -22'. 5% may be 6' - 12'. |
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Double Random (XS and lighter) -- Shortest Length 22', minimum average for order 35'. |
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Lengths longer than single random with wall thicknesses heavier than XS subject to negotiation. |
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Required Markings on Each Length
(On Tags attached to each Bundle in case of Bundled Pipe) |
| Rolled, Stamped, or Stenciled (Mfrs. Option) |
| Name brand of manufacturer |
| Kind of pipe, that is, Continuous Welded, Electric-Resistance-Welded A, Electric-Resistance-Welded B, Seamless A, Seamless B, XS for extra strong, XXS for double extra strong. |
| ASTM 53 |
| Length of pipe |
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General Information
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| 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) -- |
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STD or XS, or wall thicknesses less than 0.500 in. (excluding XXS): Plain and beveled |
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All XXS and wall thicknesses over 0.500 in.: Plain end square cut. |
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