A671 ELECTRIC FUSION WELDED (EFW) STEEL PIPE FOR ATMOSPHERIC AND LOWER TEMPERATURES
UKR Steel Products stocks A671 EFW pipe in the grades and classes listed in the following tables:
Pipe grades
Pipe classes
5.3.1 – Classes 20, 21, 22, and 23 pipes shall be uniformly heated within the post-weld heat-treatment temperature range indicated in the table below for a minimum of 1 hour per inch (0.4 hr/cm) of thickness or 1 hour, whichever is greater.
5.3.2 – Classes 30, 31, 32, and 33 pipes shall be uniformly heated to a temperature in the austenitizing range and not exceeding the maximum normalizing temperature indicated in the table below and subsequently cooled in the air at room temperature.
5.3.3 – Classes 40, 41, 42 and 43 pipe shall be normalized by 5.3.2. After normalizing, the pipe shall be reheated to the tempering temperature indicated in the table below as a minimum and held at temperature for a minimum of ½ hour per inch (0.2 hr/cm) of thickness or ½ hour, whichever is greater, and air-cooled.
5.3.4 – Classes 50, 51, 52, and 53 pipes shall be uniformly heated to a temperature in the austenitizing range not exceeding the maximum quenching temperature indicated in the table below and subsequently quenched in water or oil. After quenching, the pipe shall be reheated to the tempering temperature indicated in the table below as a minimum and held at that temperature for a minimum of ½ hour per inch (0.2 hr/cm) of thickness or ½ hour, whichever is greater, and air-cooled.
8.3 – Pressure Test – Classes X2 and X3 pipe shall be tested in accordance with specification A530/A530M, Hydrostatic Test Requirements.
9 – The full length of each weld of Classes X1 and X2 shall be radiographically examined by and meet the requirements of ASME Boiler and Pressure Vessel Code, Section VIII, Paragraph UW-51. The radiographic examination may be performed before heat treatment.
Scope
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. The specification nominally covers pipe 16 inches (400 mm) in outside diameter or larger and of ¼ inch (6 mm) wall thickness or greater. A pipe having other dimensions may be furnished provided it complies with all other requirements of this specification.
Chemical composition
Product analysis of plate: The pipe manufacturer shall analyze each mill heat of plate material. The product analysis shall meet the requirements of the plate specification to which the material was ordered.
Product analysis of weld: The pipe manufacturer shall analyze the finished deposited weld material from every 200 feet or a fraction thereof. The analysis shall conform to the welding procedure for deposited weld metal.
Heat treatment
Permissible Variations in Wall Thickness and Weight
Dictated by the requirements of the specification to which the manufacturer ordered the plate.
Permissible Variations in Outside Diameter
Based on circumferential measurement +/-0.5% of the specified outside diameter.
Permissible Variations in Outside Diameter
A20/A20M Specification for General Requirements for Steel Plates for Pressure Vessels
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A435/A435M Specification for Straight-Beam Ultrasonic Examination of Steel Plates
A530/A530M Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
A577/A577M Specification for Ultrasonic Angle-Beam Examination of Steel Plates
A578/A578M Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications
E110 Test Method for Rockwell and Brinell Hardness of Metallic Materials by Portable Hardness Testers E165/E165M Practice for Liquid Penetrant Examination for General Industry
E709 Guide for Magnetic Particle Testing