Designation: A 671
Standard Specification for
Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures
1. Scope
1.1 This specification covers electric-fusion-welded steel pipe with filler metal added, fabricated from pressure vessel quality plate of several analyses and strength levels and suitable for high-pressure service at atmospheric and lower temperatures. Heat treatment may or may not be required to attain the desired properties or to comply with applicable code requirements. Supplementary requirements are provided for use when additional testing or examination is desired.
1.2 The specification nominally covers pipe 16 in. (405mm) in outside diameter or larger and of 1/4in. (6.4 mm) wall thickness or greater. Pipe having other dimensions may be furnished provided it complies with all other requirements of this specification.
1.3 Several grades and classes of pipe are provided.
1.3.1 Grade designates the type of plate used as listed in5.1.
1.3.2 Class designates the type of heat treatment performed during manufacture of the pipe, whether the weld is radiographically examined, and whether the pipe has been pressure tested as listed in 1.3.3.
1.3.3 Class designations are as list in standard
2. Referenced Documents
2.1ASTM Standards:
A 20/A 20MSpecification for General Requirements for Steel Plates for Pressure Vessels
A 370Test Methods and Definitions for Mechanical Testing of Steel Products
A 435/A 435MSpecification for Straight-Beam Ultrasonic Examination of Steel Plates
A 530/A 530MSpecification for General Requirements for Specialized Carbon and Alloy Steel Pipe
A 577/A 577MSpecification for Ultrasonic Angle-Beam Examination of Steel Plates
A 578/A 578MSpecification for Straight-Beam Ultrasonic Examination of Plain and Clad Steel Plates for Special Applications
E110Test Method for Indentation Hardness of Metallic Materials by Portable Hardness Testers
E 165Test Method for Liquid Penetrant Examination
E 709Guide for Magnetic Particle Examination
2.2 Plate Steels:
A 203/A 203MSpecification for Pressure Vessel Plates, Alloy Steel, Nickel
A 285/A 285MSpecification for Pressure Vessel Plates, Carbon Steel, Low- and Intermediate-Tensile Strength
A 299/A 299MSpecification for Pressure Vessel Plates, Carbon Steel, Manganese-Silicon
A 353/A 353MSpecification for Pressure Vessel Plates, Alloy Steel, 9 Percent Nickel, Double-Normalized and Tempered
A 515/A 515MSpecification for Pressure Vessel Plates, Carbon Steel, for Intermediate- and Higher-Temperature Service
A 516/A 516MSpecification for Pressure Vessel Plates, Carbon Steel, for Moderate- and Lower-Temperature Service
A 517/A 517MSpecification for Pressure Vessel Plates, Alloy Steel, High-Strength, Quenched and Tempered
A 537/A 537MSpecification for Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel
A 553/A 553MSpecification for Pressure Vessel Plates, Alloy Steel, Quenched and Tempered 8 and 9 % Nickel
A 736/A 736MSpecification for Pressure Vessel Plates, Low-Carbon Age-Hardening Nickel-Copper-ChromiumMolybdenum-Columbium and Nickel-Copper-ManganeseMolybdenum-Columbium Alloy Steel
2.3 ASME Boiler and Pressure Vessel Code:
Section II, Material Specifications
Section III, Nuclear Vessels
Section VIII, Unfired Pressure Vessels
Section IX, Welding Qualifications
5. Materials and Manufacture
5.1Materials—The steel plate material shall conform to the requirement of the applicable plate specification for the pipe grade ordered as listed inTable 1.
5.2Welding:
5.2.1 The joints shall be double-welded, full-penetration welds made in accordance with procedures and by welders or welding operators qualified in accordance with the ASME Boiler and Pressure Vessel Code,Section IX.
5.2.2 The welds shall be made either manually or automatically by an electric process involving the deposition of filler metal.
5.2.3 As welded, the welded joint shall have positive reinforcement at the center of each side of the weld, but no more than1/8in. (3.2 mm). This reinforcement may be removed at the manufacturer’s option or by agreement between the manufacturer and purchaser. The contour of the reinforcement shall be smooth and the deposited metal shall be fused smoothly and uniformly into the plate surface.
5.2.4 When radiographic examination in accordance with 9.1is to be used, the weld reinforcements shall be governed by the more restrictive provision UW–51 of Section VIII of the ASME Boiler and Pressure Vessel Code instead of5.2.3of this specification.
5.3Heat Treatment—All classes other than 10, 11, 12, and 13 shall be heat treated in furnace controlled to625 °F (614°C) and equipped with a recording pyrometer so that heating records are available. Heat treating after forming and weldingshall be to one of the following:
5.3.1 Classes 20, 21, 22, and 23 pipe shall be uniformly heated within the post-weld heat-treatment temperature range indicated inTable 2for a minimum of 1 h/in. of thickness or for 1 h, whichever is greater.
5.3.2 Classes 30, 31, 32, and 33, pipe shall be uniformly heated to a temperature in the austenitizing range and not exceeding the maximum normalizing temperature indicated in Table 2 and subsequently cooled in air at room temperature.
5.3.3 Classes 40, 41, 42, and 43 pipe shall be normalized in accordance with 5.3.2. After normalizing, the pipe shall be reheated to the tempering temperature indicated inTable 2 as a minimum and held at temperature for a minimum of 1/2h/in. of thickness or for 1/2h, whichever is greater, and air cooled.
5.3.4 Classes 50, 51, 52, and 53 pipe shall be uniformly heated to a temperature in the austenitizing range, and not exceeding the maximum quenching temperature indicated in Table 2and subsequently quenched in water or oil. After quenching, the pipe shall be reheated to the tempering temperature indicated inTable 2as a minimum and held at that temperature for a minimum of 1/2h/in. of thickness or for 1/2h, whichever is greater, and air cooled.
5.3.5 Classes 60, 61, 62, and 63 pipe shall be normalized in accordance with 5.3.2. After normalizing, the pipe shall be precipitation heat treated in the range shown inTable 2for a time to be determined by the manufacturer.
5.3.6 Classes 70, 71, 72, and 73 pipe shall be uniformly heated to a temperature in the austenitizing range, not exceeding the maximum quenching temperature indicated inTable 2, and subsequently quenched in water or oil. After quenching the pipe shall be reheated into the precipitation heat treating range indicated in Table 2 for a time to be determined by the manufacturer.
11. Dimensions, Mass and Permissible Variations
11.1 The wall thickness and weight for welded pipe furnished to this specification shall be governed by the requirements of the specification to which the manufacturer ordered the plate.
11.2 Permissible variations in dimensions at any point in a length of pipe shall not exceed the following:
11.2.1 Outside Diameter—Based on circumferential measurement 60.5 % of the specified outside diameter.
11.2.2 Out-of-Roundness—Difference between major and minor outside diameters, 1 %.
11.2.3 Alignment—Using a 10-ft (3-m) straight edge placed so that both ends are in contact with the pipe, 1/8in. (3.2 mm).
11.2.4 Thickness—The minimum wall thickness at any point in the pipe shall not be more than 0.01 in. (0.25 mm) under the specified nominal thickness.
11.3 Circumferential welded joints of the same quality as the longitudinal joints shall be permitted by agreement between the manufacturer and the purchaser.
11.4 Lengths with unmachined ends shall be within −0, +1/2in. (−0, +13 mm) of that specified. Lengths with machined ends shall be as agreed between the manufacturer and the purchaser.
Other information in details please check A671.