ASTM A193/A193M-25 PDF

Full title and description

ASTM A193/A193M-25 — Standard Specification for Alloy‑Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications. This specification covers bolting materials and components (bars, bolts, screws, studs, stud bolts, and wire) intended for pressure vessels, valves, flanges, fittings and other special‑purpose high‑temperature or high‑pressure applications; it defines permitted chemistries, required mechanical properties, heat‑treatment and testing, and supplementary requirements available by purchase order.

Abstract

This standard establishes grades, chemical composition limits, mechanical property requirements (tensile, yield, elongation, hardness), heat‑treatment practices, and inspection/testing provisions for alloy‑steel and stainless‑steel bolting used in elevated‑temperature or high‑pressure service. It includes requirements for nuts, references supplementary requirements (S1–S10), and is published in both inch‑pound and SI (M) units.

General information

• Status: Current / Active.
• Publication date: 1 May 2025.
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: 21.060.01 (Fasteners in general); 77.080.20 (Steels).
• Edition / version: A193/A193M‑25 (2025 edition).
• Number of pages: 14.

(Publication status, date, publisher and pagination as reported in standards listings and the ASTM catalog.)

Scope

The specification applies to alloy and stainless steel bolting materials and bolting components for pressure vessels, valves, flanges, fittings and other special‑purpose applications where elevated temperature or high pressure performance is required. It addresses both ferritic and austenitic grades, requires appropriate heat treatment for ferritic steels, specifies chemical composition limits, and provides mechanical property and hardness criteria; supplementary requirements (when invoked) add optional tests or inspections. The document is published in matched inch‑pound and SI (M) units.

Key topics and requirements

• Designation of multiple bolting grades for alloy and stainless steels and their permitted chemical compositions.
• Mechanical property limits (tensile strength, yield, elongation) and hardness requirements for each grade.
• Required heat‑treatment / tempering instructions and special provisions for certain grades (e.g., ferritic vs. austenitic treatments).
• Acceptance testing: tensile testing, hardness testing, and other specified examinations; full‑size fastener testing where applicable.
• Supplementary requirements (S1–S10) available by agreement to add tests or inspections beyond the base standard.
• Provision covering nuts for use with the bolting materials (referenced in the standard).
• Dual‑unit presentation (inch‑pound and SI/M units) and purchaser specification of unit system where applicable.

These are the principal subject areas and mandatory/optional test and acceptance items covered by the standard.

Typical use and users

Typical users include mechanical and pressure‑vessel engineers, piping designers, OEMs, bolting and fastener manufacturers, procurement specialists, quality and inspection personnel, and regulatory bodies specifying bolting materials for high‑temperature or high‑pressure equipment in industries such as oil & gas, petrochemical, power generation, and process plants. The standard is used to select appropriate bolting grades, set procurement requirements, and establish acceptance testing and documentation.

Related standards

Commonly referenced and related standards include ASTM A962/A962M (definition/terminology for bolting), ASTM A320/A320M (bolting for low‑temperature service), ASTM A354 (alloy‑steel bolts for lower high‑temperature ranges), and ASTM A194 (nuts for bolting materials for pressure vessels). Buyers frequently invoke supplementary standards for coatings, hardness conversion, and test methods (see normative references within A193/A193M).

Keywords

bolting, fasteners, alloy‑steel, stainless steel, high‑temperature service, high‑pressure service, studs, bolts, nuts, tensile strength, hardness, heat treatment, supplementary requirements, ASTM A193

FAQ

Q: What is this standard?

A: ASTM A193/A193M‑25 is an ASTM International specification that sets requirements for alloy‑steel and stainless‑steel bolting materials used in high‑temperature or high‑pressure service and other special applications.

Q: What does it cover?

A: It covers material chemistries, mechanical and hardness property limits, heat‑treatment requirements, testing and inspection provisions, supplementary requirements (S1–S10), and provisions for nuts used with the bolting materials. The standard is published in both inch‑pound and SI (M) units.

Q: Who typically uses it?

A: Engineers, fastener manufacturers, purchasers, quality/inspection staff, and plant operators in industries such as oil & gas, petrochemical, power generation and other sectors that require bolting for pressure‑containing or high‑temperature equipment.

Q: Is it current or superseded?

A: The edition specified is A193/A193M‑25 (published 1 May 2025) and is listed as the active/current edition in standards catalogs at the time of publication. Users should confirm any later revisions or work items that may be in ballot or development.

Q: Is it part of a series?

A: Yes — A193/A193M is part of ASTM's suite of fastener and bolting specifications (see related specifications such as A320/A320M, A354, A194 and A962/A962M). It is maintained by Committee A01 (Subcommittee A01.22) and is periodically revised.

Q: What are the key keywords?

A: Bolting, fasteners, alloy‑steel, stainless steel, high‑temperature, high‑pressure, studs, nuts, tensile, hardness, heat treatment, ASTM A193.