ASTM A / AM – 16 Standard Specification for General Requirements for Alloy and Stainless Steel Pipe. This specification(Footnote 2). This standard is issued under the fixed designation A/AM; the number immediately specification, shall apply to the ASTM product specifications. Tolerances acc. ASTM A (welded and seamless pipes). OD mm. Tol. OD. ( mm). t/m. + > t/m. + > t/ m.
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A999 D e1. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. In the case of conict between a requirement of the product specication or a requirement of this specication and a more stringent requirement of the purchase q999, the purchase order shall prevail. Title of Specication ASTM Designation3 are not exact equivalents; therefore each system must be used independently of the other.
Combining values from the two systems may result in nonconformance with the specication. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and a99 the applicability of regulatory limitations prior to use.
Sstm the text, the SI units are shown in brackets. Current edition approved March 10, Such requirements to be considered include, but are not limited to, the following: If secondary melting processes are employed, the heat analysis shall be obtained from one remelted ingot or the product of one remelted ingot of each primary melt.
ASTM A for Alloy and Stainless Steel Pipe
The chemical composition thus determined, or that determined from a product analysis made by the tubular product manufacturer shall conform to the requirements specied.
When using small or subsize specimens, the largest one possible shall be used. Permissible Variation in Weight for Seamless Pipe 8. Unless otherwise specied, pipe of NPS 4 and smaller may be weighed in convenient lots; pipe in sizes larger than NPS 4 shall be weighed separately. BoxColumbus, OH — Permissible Variations in Wall Thickness 9. The minimum wall thickness on inspection is shown in Table X1.
There shall be no variation under the specied wall thickness. Permissible Variations in Inside Diameter There shall be no variation over the specied inside diameter.
ASTM A999 for Alloy and Stainless Steel Pipe
Permissible Variation in Outside Diameter The tolerances on outside diameter include ovality except as provided for in NOTE 2—Thin-wall pipe usually develops signicant ovality out-ofroundness during nal annealing, straightening, or both.
The diameter tolerances of Table 1 are usually not sufficient to provide for additional ovality expected in thin-wall pipe. Standard Weight Weight per Unit Length The standard sizes do not prohibit the production and use of other sizes of pipe produced to the various product specications referenced in 1. Permissible Variations in Length All burrs at the ends of the pipe shall be removed. For metal-arc welded pipe with lengths shorter than 10 ft [3.
Repair by Welding Defects shall be thoroughly chipped or ground out before welding and each repaired length shall be reheat treated or stress relieved as required by the applicable specication. Each length of repaired pipe shall be nondestructively tested as required by the product specication. Only one retest of any lot will be permitted. Nonconformance will be cause for the rejection of the lot.
Individual lengths that do not conform to the test requirements may be resubmitted for test provided the reason for nonconformance is established and the nonconforming portion removed.
The manufacturer may reheat treat the pipe, but not more than twice, except with the approval of the purchaser.
Flattening Test Requirements During the rst step, which is a test for ductility, asstm cracks or breaks on the inside, outside, or end surfaces, except as provided for in During the second step, which is a test for soundness, the attening shall be continued until the specimen breaks or the opposite walls of the pipe meet. During the rst step, which is a test for ductility, no cracks or breaks on the inside or outside surfaces, except a9999 provided for in Nondestructive Test Requirements The test pressure or stress shall be determined by the following equation: The hydrostatic test may be performed prior to cutting to nal length, or prior to upsetting, swaging, expanding, bending, or other forming operations.
This does not prohibit testing at higher pressures at the option of the manufacturer or as provided in For welded pipe, the test pressure shall be held for a time sufficient to permit the entire length of the welded seam to be inspected.
The length of pipe that cannot be tested shall be axtm by the manufacturer and, when specied in the purchase order, reported to the purchaser. Unless specically called out by the purchaser, the selection of the nondestructive electric test shall be at the s999 of the manufacturer. Upon agreement between purchaser asym manufacturer, Practice E shall be a99 in addition to one of the full periphery tests. The range of pipe sizes that may be examined by each method shall be subject to the limitations in the scope of the respective practices.
The dimensions of these standards should not be construed as the minimum size imperfection detectable by such equipment. It should be recognized that different techniques should be used to detect differently oriented satm. The examination may not detect short deep defects. The sensitivity of this test decreases with thickness over 0. However, sensitivity of the test to various types of discontinuities is affected by the calibration, and different techniques should be employed to detect differently oriented imperfections.
This equipment does not preclude additional testing at earlier stages in the processing. The methods used for cleaning and preparing the surfaces for examination shall not be detrimental to the base metal or the surface nish. Other nondestructive tests may be applied to the end areas, subject to agreement between the purchaser and the manufacturer. On asttm walls up to 0. The width of the notch shall not exceed twice the depth. Notches shall be placed on both the OD and ID surfaces.
The holes shall be asm radially and completely through the pipe wall, with care being taken to avoid distortion of the pipe while drilling.
One hole shall be drilled in the weld, if visible. The hole diameter shall be no larger a99 as follows: Extraneous signals caused by identiable causes such as dings, scratches, dents, straightener marks, etc. The test system settings may be changed, or the transducer scoil s or sensor s adjusted, and the unit restandardized, but all pipe tested since the last acceptable standardization must be retested for acceptance.
The area producing the signal may be reexamined. These pipes may be repaired when such repair is permitted by the applicable product specication.
To be accepted, a repaired pipe must pass the same nondestructive test by which it was rejected, and it must meet the minimum wall astk requirements 9a99 the applicable product specication. The pipe may be accepted based on visual examination provided that the imperfection is less than 0. The outside diameter at the point of grinding may be reduced by the amount so removed. To be accepted, retested pipe shall meet the test requirement. The manufacturer shall afford the inspector all reasonable facilities to satisfy him that the material is being furnished in accordance with this specication.
All required tests and inspection shall be made at the place of manufacture prior to shipment, unless otherwise specied, and shall be conducted so as not to interfere unnecessarily with operation of the works.
Disposition of rejected pipe shall be a matter of qstm between the manufacturer and the purchaser. Disposition of such pipe shall be matter for agreement. Certied Test Report A signature or notarization is not required on the certied test report, but the document shall be dated and shall clearly identify the organization submitting the report.
NOTE 4—Notwithstanding the absence of a signature or notarization, the organization submitting the Report is responsible for the contents of the report. Notwithstanding the absence of a signature, the organization submitting the EDI transmission is responsible for the content of the report.
Marking shall begin approximately 12 in. For pipe less than NPS 2 and pipe under 3 ft [1 m] in length, the required information may be marked on a tag securely attached to the bundle or box in which the pipes are shipped. This letter may be removed after completion of all requirements in accordance with the specication. An explanation of specication requirements to be completed is provided in Packaging, Marking, and Loading Government where scale-free pipe is required. These requirements shall take aetm if there is a conict between these requirements and the product specication.
The absence of any inspection requirements in the specication shall not relieve the contractor of the responsibility for ensuring that all products or supplies submitted to the government for acceptable comply with all requirements of the contract. Sampling inspection, as part of the manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or 7 The purchaser must certify that all requirements of the specication have been completed before the removal of the letter that is, X, Y, or Z.
Except as otherwise specied in the contract or purchase order, the manufacturer may use his own or any other suitable facilities for the performance of the inspection and test requirements unless disapproved by the purchaser at the time the order is placed.
The purchaser shall have the right to perform any of the inspections and tests set forth when such inspections and tests are deemed necessary to ensure that the material to conforms to the prescribed requirements. Lot Size Pieces per Lot 2 to 8 9 to 90 91 to to to to to to 10 10 to 35 Sample Size Entire Lot 18 12 19 21 27 35 38 46 In all cases, the acceptance number aatm zero and the rejection number is one.
Rejected lots may be screened and resubmitted for visual and dimensional examination. All defective items shall be replaced with acceptable items prior to lot acceptance. A lot shall be all material poured from one heat. A lot shall consist of all pipe of a999 same outside diameter and wall thickness manufactured during an 8-h shift from the same heat of steel, and heat treated under the same conditions of temperature and time in a single charge in a batch type furnace, or heat treated under the same condition in a continuous furnace, and presented for inspection at the same time.
The internal surface of hot nished ferritic steel pipe shall be pickled or blast cleaned to a free of scale condition equivalent to the CSa2 visual asm in SSPC-SP6.