ASTM A671/A671M-20 (2025) PDF

Full title and description

ASTM A671/A671M-20 (reapproved/issued 2025) — Standard Specification for Electric‑Fusion‑Welded Steel Pipe for Atmospheric and Lower Temperatures. The specification sets material, manufacturing, heat‑treatment, testing, and inspection requirements for electric‑fusion‑welded steel pipe fabricated from pressure‑vessel quality plate, supplied in several grades and classes for use at atmospheric and lower service temperatures.

Abstract

This specification covers electric‑fusion‑welded steel pipe with filler metal added, fabricated from pressure‑vessel quality plate of various analyses and strength levels. It defines grade and class designations (grade = plate type; class = heat treatment/examination/pressure testing), required mechanical tests (including tension and transverse guided‑weld bend tests), options for radiographic examination and pressure testing, and recognizes inch‑pound and SI unit systems as separate standards. Supplementary requirements are provided for additional testing or examination.

General information

• Status: Active (current specification; reissued/reapproved in 2025).
• Publication date: Designation A671/A671M‑20 (original 2020 edition; reapproved/reissued 2025 — often shown as A671/A671M‑20(2025) or A671/A671M‑20R25).
• Publisher: ASTM International.
• ICS / categories: 23.040.10 (iron and steel pipes / pipeline components and pipelines).
• Edition / version: A671/A671M‑20 (listed/released with 2025 reapproval/issue markings).
• Number of pages: 7 pages (concise specification document).

Key bibliographic facts above are summarized from the ASTM/standards catalogue entries for A671/A671M‑20 and related reissue notices.

Scope

The standard applies to electric‑fusion‑welded steel pipe with added filler metal, intended for high‑pressure service at atmospheric and lower temperatures, fabricated from pressure‑vessel quality plate. Nominal coverage is for pipe 16 in. (400 mm) outside diameter or larger and wall thicknesses of 1/4 in. (6 mm) or greater, although other sizes may be furnished if they meet the specification requirements. The specification provides grades identifying plate chemistry/characteristics and classes identifying heat treatment, radiographic examination, and pressure testing requirements; supplementary requirements permit additional inspection/testing when requested.

Key topics and requirements

• Material source: fabricated from pressure‑vessel quality plate (multiple plate analyses/strength levels defined).
• Grades and classes: grade designates plate type; class designates heat treatment and whether radiographic/pressure tests are performed.
• Heat treatment options: stress relief, normalization, normalization & tempering, quench & temper, and precipitation heat treatments across various grades/classes.
• Mechanical testing: specified tension tests and transverse guided‑weld bend tests for weld soundness and mechanical properties.
• Non‑destructive examination: radiographic examination options and acceptance criteria for specified classes.
• Pressure testing: class‑dependent hydrostatic/pressure test requirements where specified.
• Units: inch‑pound and SI units are provided; the two systems are to be used independently (the “M” designation indicates metric order preference).
• Supplementary requirements: optional additional tests/examinations can be invoked by purchaser order.

The list above summarizes the principal technical elements and purchaser options defined in the specification.

Typical use and users

ASTM A671/A671M is typically used by manufacturers of electric‑fusion‑welded steel pipe, fabricators and inspectors involved in pressure piping and boiler components, engineering and procurement teams specifying pipe for power plants, refineries and other industrial installations, and code authorities referencing material specifications for pressure‑containing systems. The standard is used where welded pipe from plate is required to meet pressure‑service mechanical and inspection requirements.

Related standards

ASTM A671/A671M references and is commonly used in conjunction with other ASTM standards and code documents. Notable related standards include ASTM A20/A20M (guidance on plate selection for temperature of service), A370 (mechanical test methods), and various ultrasonic and radiographic examination practices; for ASME Boiler and Pressure Vessel Code applications, an associated SA‑671 designation may be used in Code Section II. Users should consult the normative references within A671 for the full list.

Keywords

electric‑fusion‑welded pipe, welded steel pipe, pressure‑vessel plate, boiler tube pipe, grades and classes, heat treatment, radiographic examination, pressure testing, tension test, guided‑weld bend test, inch‑pound, SI units.

FAQ

Q: What is this standard?

A: ASTM A671/A671M‑20(2025) is a concise ASTM standard specification that defines material, manufacturing, heat‑treatment, testing and inspection requirements for electric‑fusion‑welded steel pipe made from pressure‑vessel quality plate for atmospheric and lower temperature service.

Q: What does it cover?

A: It covers electric‑fusion‑welded steel pipe with filler metal added, provides grade and class designations, specifies mechanical tests (tension, transverse guided‑weld bend), inspection options (radiography, pressure testing), and notes unit system usage; nominal sizes and minimum wall thickness are given but other sizes may be supplied if compliant.

Q: Who typically uses it?

A: Pipe manufacturers, materials and welding engineers, quality/inspection personnel, procurement specialists specifying pressure‑service pipe, and code bodies or fabricators working to pressure‑vessel and boiler piping requirements.

Q: Is it current or superseded?

A: The document is listed as the A671/A671M‑20 edition with a 2025 reissue/reapproval marking (commonly shown as A671/A671M‑20(2025) or A671/A671M‑20R25) and is shown as active/current in standards catalogues. Users should check the issuing body for the absolute current status before procurement.

Q: Is it part of a series?

A: The specification is maintained under ASTM Committee A01 (Subcommittee A01.09 on carbon steel tubular products) and is related to ASME/SA‑671 when used for ASME Boiler and Pressure Vessel Code applications; it also cross‑references other ASTM test and examination practices.

Q: What are the key keywords?

A: electric‑fusion‑welded steel pipe, pressure‑vessel plate, grades, classes, heat treatment, radiography, pressure test, mechanical testing, inch‑pound/SI.