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ASTM A671 Pipes & Tubes

ASTM A671 Pipes & Tubes

The oil and gas, petrochemical, and power-producing industries all employ pipes and tubes that comply with ASTM A671. They are designed to operate at low temperatures and are constructed from steel pipes that have been electric-fusion welded. These tubes and pipes were created with the intention of withstanding the difficulties posed by low-temperature conditions without compromising reliability or safety. We will give a comprehensive overview of the main characteristics, uses, and benefits of ASTM A671 Pipes and Tubes in this introduction.
Electric fusion welding is used to create the pipes and tubes that conform to ASTM A671 in order to create a solid and even bond between the steel plates. With better weld integrity produced by this method of welding, leaks and failures in low-temperature applications are less likely. Further ensuring the strength and integrity of the joints is the exact control the electric fusion welding technique has over the welding environment.
Specifically developed for low-temperature use, ASTM A671 Pipes and Tubes can resist temperatures as low as -50°F (-46°C). They function dependably and resist brittle fracture even in extremely cold temperatures because of their excellent low-temperature toughness. Due to high operating temperatures, these pipes and tubes are suited for applications requiring good toughness and impact resistance.
Pipes and tubes that comply with ASTM A671 are held to exacting quality requirements to guarantee dependability and performance. They are in compliance with ASTM A671/A671M standard criteria for steel pipes that have been electric-fusion welded for atmospheric and lower temperatures. This criterion must be met by the pipes and tubes in order to ensure that they have the dimensional, mechanical, and chemical qualities required for use at low temperatures.
Steel that has been electric-fusion welded and is suitable for low-temperature applications is used to make pipes and tubes that adhere to ASTM A671 specifications. To make sure the steel has the properties needed to resist low-temperature settings, it is carefully chosen and evaluated. The steel’s low-temperature toughness and impact resistance are a result of its unique chemical composition and microstructure.
Extensive testing and inspection are used to verify the quality and standard compliance of pipes and tubes made in accordance with ASTM A671. To find any surface or interior flaws, these tests include visual examination, dimensional inspection, mechanical testing, and non-destructive testing. Due to their focus on quality and standards compliance, ASTM A671 pipes and tubes are warranted to meet the criteria for low-temperature usage.

ASTM A671 Pipes & Tubes Specifications

DimensionsOuter Diameter (OD): 16 inches to 100 inches
 Wall Thickness: Varies depending on size and application
Material CompositionCarbon Steel:
 – Grade CA: C 0.20% max., Mn 0.95% max., P 0.035% max., S 0.035% max.
 – Grade CB: C 0.30% max., Mn 1.20% max., P 0.035% max., S 0.035% max.
Mechanical PropertiesTensile Strength: Varies depending on the grade. Typical range: 415 MPa (60,000 psi) to 585 MPa (85,000 psi)
 Yield Strength: Varies depending on the grade. Typical range: 205 MPa (30,000 psi) to 380 MPa (55,000 psi)
 Elongation: Minimum of 25% for longitudinal strip tests
Heat TreatmentPipes and tubes may be furnished with or without heat treatment.
Welding ProcessElectric fusion welding is used to join the plates and form the pipes and tubes.
ClassesClasses 10, 11, 12, 13, 20, 21, 22, 23, 30, 31, 32, 33, 40, 41, 42, 43, 50, 51, 52, 53, 60, 61, 62, 63, 70, 71, 72, and 73 are available.
Hydrostatic TestEach pipe and tube undergoes a hydrostatic test to ensure it can withstand the specified pressure without leakage.
Surface ConditionPipes and tubes should have a smooth surface finish, free from scale, rust, or imperfections.
StraightnessPipes and tubes should be reasonably straight, with slight deviations permissible as long as they don’t affect suitability.

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