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21. Marking |
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21.1 In addition to the marking prescribed in specification A 530, the marking shall include the hydrostatic test pressure when tested, or the letter “NH” when not tested, and additional symbol “S” if the pipe conforms in any cast to the supplementary requirements specified in sections S1 to S4, the length and schedule number, and on pipe sizes larger than 4 in. the weight shall be given. Length shall be marked in feet and tenths of a foot, or meters to two decimal places, depending on the units to which the material was ordered or other marking subject to agreement. | |
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21.2 When Pipe sections are cut into shorter lengths by a subsequent processor for resale as material, the processor shall transfer complete identifying information to each unmarked cut length, or to metal tags securely attached to bundles of unmarked small diameter pipe. The same material designation shall be included with the information transferred, and the processor’s name, trademark, or brand shall be added. |
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22. Government Procurement |
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22.1 When specified in the contract, material shall be preserved, packaged, and packed in accordance with the requirements of MIL – STD – 163. The applicable levels shall be as specified in the contract. Marking for the shipment of such material shall be in accordance with fed. Std. No 123 for civil agencies and MIL – STD – 129 for military agencies. |
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22.2 Inspection - Unless otherwise specified in the contract, the producer is responsible for the performance of all inspection and test requirement specified herein. Except as otherwise specified in the contract, the producer may use his own, or any other suitable facilities for the performance of the inspection and test requirements specified herein, unless disapproved by the purchaser. The purchaser shall have the right to perform any of the inspections and tests set forth in this specification where such inspections are deemed necessary to ensure that the material conforms to the prescribed requirements. |
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One or more of the following supplementary requirements shall apply only when specified in the purchase order. The purchaser may specify a different frequency of agreement between the purchaser and manufacture, retest and retreatment provisions of these supplementary requirements may also be modified. |
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S1. Products Analysis |
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S1.1 Product analysis shall be made on each length of pipe. Individual length failing to conform to the chemical composition requirements shall be rejected. |
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S2. Transverse Tension Test |
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S2.1 A transverse tension test shall be made on a specimen from one end or both ends of each pipe NPS 8 and over. If this supplementary requirement is specified, the number of tests per pipe shall also be specified. If a specimen from any length fails to meet the required tensile properties (tensile, yield, and elongation), that length shall be rejected subject to retreatment in accordance with specification A 530 and satisfactory retest. |
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S3. Flattening Test |
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S3.1 The flattening test of specification A 530 shall be made on a specimen from one end or both ends of each pipe. Crop ends may be used. If this supplementary requirement is specified, the number of tests per pipe shall also be specified. If a specimen from any length fails because of lack of ductility prior to satisfactory completion of the first step of the flattening test requirement, that pipe shall be rejected subject to retreatment in accordance with specification A 530 and satisfactory retest. If specimen from any length of pipe fails because rejected, unless subsequent retesting indicates that the remaining length is sound. |
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S4. Metal Structure and Etching Test |
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S4.1 The steel shall be homogeneous as shown by etching tests conducted in accordance with the appropriate sections of method E 381. Etching tests shall be made on a cross section from one end or both ends of each pipe and shall show sound and reasonably uniform material free from injurious laminations, cracks and similar objectionable defects. If this supplementary requirement is specified, the number of tests per pipe required shall also be specified. If a specimen from any length shows objectionable defects, the length shall be rejected, subject to removal of the defective end and subsequent retests indication the remainder of the length to be sound and reasonably uniform material. |
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EXPLNATORY NOTES |
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Note 1 - Consideration should be given to possible graphitization of the material at the higher temperatures at which it may be used.
Note 2 - Grade A rather than Grade B Pipe should be used for close coiling, cold bending, or for forge welding. The purpose for which the pipe is to be used should be stated in the order. This note is not intended to prohibit the cold bending of grade B seamless pipe. |
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TABLE 1 Chemical Requirements |
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| COMPOSITIONS % |
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Grade A |
Grade B |
Grade C |
| Carbon, max |
0.25 |
0.30 |
0.35 |
| Manganese |
0.27 -0.93 |
0.29-1.06 |
0.29-1.06 |
| Phosphorus, max |
0.048 |
0.048 |
0.048 |
| Sulfur, max |
0.058 |
0.058 |
0.058 |
| Silicon, min |
0.10 |
0.10 |
0.10 |
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