ASTM A240/A240M-25a PDF

Full title and description

ASTM A240/A240M-25a — Standard Specification for Chromium and Chromium‑Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications. Specifies chemical, mechanical, dimensional, and delivery requirements for flat stainless steel products used in pressure‑containing and general structural/architectural applications.

Abstract

This specification covers chromium, chromium‑nickel, and chromium‑manganese‑nickel stainless steel plate, sheet, and strip intended for pressure vessels and general applications. It sets limits for chemical composition, prescribes required mechanical properties, and addresses heat treatment, testing, marking and acceptance criteria. The document is published in both inch‑pound and SI units (A240/A240M).

General information

• Status: Active specification (latest revision 25a).
• Publication date: June 1, 2025 (document update recorded June 17, 2025).
• Publisher: ASTM International.
• ICS / categories: 77.140.30 — Steels for pressure purposes; materials for pressure‑retaining equipment.
• Edition / version: A240/A240M‑25a (revision 25a).
• Number of pages: 12 pages (typical published PDF/print edition).

Scope

The standard applies to chromium, chromium‑nickel, and chromium‑manganese‑nickel stainless steel plate, sheet and strip used for pressure vessels and for general applications including architectural and construction uses. It defines allowable chemical composition ranges for specified UNS/grade designations, required mechanical properties (tensile, yield, elongation, hardness where applicable), heat treatment conditions, and requirements for sampling, testing, marking and documentation. The A240/A240M format provides both customary (inch‑pound) and metric values and includes purchaser options for additional tests or supplementary requirements.

Key topics and requirements

• Chemical composition limits for chromium, nickel, manganese, carbon, nitrogen and other specified elements for listed grades.
• Mechanical property requirements (minimum tensile strength, yield, and elongation) and applicable hardness limits for some grades.
• Heat treatment and condition designations (annealed, solution treated, etc.) and their effect on properties.
• Dimensional and tolerance references (thickness, width, flatness) and surface finish designations; metric and inch‑pound unit presentation (A240/A240M).
• Sampling, inspection and testing methods (tensile, hardness, optional impact), acceptance criteria and record‑keeping/traceability/marking.
• Purchaser options and supplementary requirements for special alloys, additional tests or tighter tolerances.

Typical use and users

This specification is used by material purchasers, mill producers, fabricators, pressure‑vessel and heat‑exchanger manufacturers, mechanical and corrosion engineers, and inspection authorities. Typical applications include pressure vessels, boilers, heat exchangers, piping components, architectural panels, chemical process equipment and other general structural uses where corrosion resistance and specified mechanical performance are required.

Related standards

Commonly invoked or related documents include ASME SA‑240 (equivalent material specification used in ASME Boiler & Pressure Vessel Code), ASTM A480/A480M (general requirements for stainless steel plate, sheet and strip), ASTM A666 (austenitic stainless steel flat products), and international equivalents such as EN 10088‑2 and relevant JIS/GB national standards. Project specifications often reference A240/A240M together with dimensional and finish standards and applicable code requirements.

Keywords

ASTM A240, A240M, stainless steel, chromium‑nickel, chromium‑manganese‑nickel, plate, sheet, strip, pressure vessels, chemical composition, mechanical properties, heat treatment, A240‑25a, ASME SA‑240, metric/inch.

FAQ

Q: What is this standard?

A: ASTM A240/A240M‑25a is a material specification that defines requirements for chromium and chromium‑nickel stainless steel plate, sheet and strip for pressure vessels and general applications.

Q: What does it cover?

A: It covers chemical composition limits, mechanical property requirements, heat treatment conditions, dimensional/finish considerations, testing and acceptance criteria, marking and traceability for listed stainless steel grades.

Q: Who typically uses it?

A: Material buyers, steel mills, fabricators, pressure‑vessel and heat‑exchanger manufacturers, engineers, quality and inspection personnel, and code authorities use this specification to ensure consistent material performance.

Q: Is it current or superseded?

A: As of February 20, 2026, the active published revision is A240/A240M‑25a (published June 1, 2025 with an update recorded June 17, 2025). Users should check organizational code or purchaser requirements for any subsequent amendments or work items that may be in progress.

Q: Is it part of a series?

A: Yes — A240/A240M is part of ASTM Committee A01 stainless steel product specifications and is commonly used alongside general requirements standards (for example ASTM A480/A480M) and other flat‑rolled stainless standards; it also has an ASME equivalent designation (SA‑240) for Code work.

Q: What are the key keywords?

A: Stainless steel, chromium‑nickel, plate, sheet, strip, pressure vessels, chemical composition, mechanical properties, A240, A240M, ASME SA‑240.