Difference Between ASTM and ASME Standards

The main difference between ASTM and ASME standards is their primary purpose: ASTM develops standards for materials, products, testing methods, and performance, while ASME develops engineering codes and standards for the design, construction, inspection, and safe operation of mechanical equipment and systems. However, their scopes overlap, especially in pressure piping, boilers, and pressure vessels.

For steel pipe applications, ASTM standards such as ASTM A106 and ASTM A53 specify material and product requirements, while ASME standards such as ASME B31.3 and ASME B36.10M address piping design and dimensional requirements. ASME also incorporates material specifications into its Boiler and Pressure Vessel Code (BPVC).

Understanding the difference between ASTM and ASME helps engineers, contractors, and purchasing teams select the correct steel pipe specifications, verify material certificates, and meet project requirements.

Introduction to ASTM and ASME

ASTM International (formerly known as the American Society for Testing and Materials) is an organization that develops and publishes international standards for materials, products, systems, and services.ASTM standards are recognized globally and used across various industries — from construction and oil & gas to aerospace and electronics.

ASME stands for the American Society of Mechanical Engineers. Unlike ASTM, ASME focuses not just on materials but also on engineering design, safety codes, and mechanical system standards.ASME is best known for developing the Boiler and Pressure Vessel Code (BPVC) and the B31 Code for Pressure Piping, which are mandatory in many countries for pressure equipment manufacturing and inspection.

Understanding the “A” and “SA” Designations

The difference between an “A” and an “SA” designation is often misunderstood.
Here’s the breakdown:
ASTM Axxx → Refers to ASTM material specifications.
ASME SAxxx → Refers to materials that comply with ASTM specifications plus additional ASME code requirements.
In other words, when a material is designated as “SA,” it has been approved for use under the ASME Boiler and Pressure Vessel Code (BPVC) Section II.

Difference between ASTM and ASME Standard:

Comparison	ASTM	ASME
Full name	ASTM International	American Society of Mechanical Engineers
Primary focus	Materials, products, testing, and performance	Engineering codes, equipment construction, and safety
Typical documents	Material specifications and test methods	Design, construction, inspection, and material-related codes
Steel pipe examples	ASTM A53, ASTM A106	ASME B31.3, ASME B36.10M
Pressure equipment	Provides material and product requirements for applicable applications	Provides applicable construction and piping codes
Material requirements	Defines specified material properties and product requirements	References and includes material specifications in applicable codes
Testing	May specify chemical, mechanical, dimensional, and other tests	Establishes code-specific inspection, examination, testing, and acceptance requirements
Typical users	Material manufacturers, laboratories, buyers, and engineers	Designers, fabricators, inspectors, and equipment manufacturers

1. Purpose: ASTM standards define material specifications and testing methods, while ASME standards cover engineering design, construction, and safety requirements.
2. Scope: ASTM focuses on materials such as steel pipes, plates, and fittings. ASME covers boilers, pressure vessels, and piping systems.
3. Requirements: ASTM specifies chemical composition, mechanical properties, and testing procedures. ASME establishes rules for design, fabrication, inspection, and pressure equipment safety.
4. Application: ASTM and ASME standards often work together. For example, ASTM A106 specifies seamless carbon steel pipe requirements, while ASME B31.3 covers process piping design and construction.

Key takeaway: ASTM and ASME are complementary rather than competing standards organizations. The correct choice depends on whether the project needs a material specification, a dimensional standard, an engineering code, or a combination of these documents.

ASTM American Society for Testing and Materials Standards

ANSI American National Flange Standards
They are three different standardization organizations, and each standard has its own system, which is the most influential and applied in the American Standard system.
Among them, ASME standards and ANSI standards cover most of the industrial fields, including materials, processing, technology, testing and so on. ASME cites many ANSI and ASTM standards. For pipes and pipe accessories, these three are basically unified, commonly known as American standard pipes, pipe fittings, pipe accessories (flanges, gaskets, etc.), and ASME is the most used /ANSI standard.
ASTM is responsible for the development and re-enactment of standards for all types of old and new materials. Because it is the test and materials association.
ASME is to selectively absorb and filter these standards for the relevant works used, and to be modified to improve.
ASTM is the US material standard, similar to the domestic GB713
ANSI is a flange standard, similar to domestic HG20615
ASME is a design specification, but since ASME is a complete system, ASTM and ANSI are included in it, such as SA516-70, ASME B16.5.
ASME is a design specification, but ASME is a complete system.

ASTM A106 vs ASME SA106: What Is the Difference?

ASTM A106 and ASME SA106 are closely related designations encountered in carbon steel pipe procurement for high-temperature service.
ASTM A106/A106M is an ASTM material specification for seamless carbon steel pipe. ASME Section II, Part A, contains ferrous material specifications used within the ASME Boiler and Pressure Vessel Code framework.
The SA designation is used for material specifications adopted or listed within the applicable ASME code context. However, buyers should not assume that adding an S to an ASTM designation automatically establishes complete equivalence or compliance.

Item	ASTM A106/A106M	ASME SA-106
Standard context	ASTM material specification	ASME BPVC material specification designation
Product	Seamless carbon steel pipe for high-temperature service	Corresponding material specification when included in the applicable ASME code
Grade examples	Grade A, Grade B, Grade C, subject to the applicable edition	Check the applicable ASME edition and material listing
Material verification	Confirm compliance with the specified ASTM edition	Confirm compliance with the applicable ASME code edition and project requirements
Procurement requirement	Specify grade, size, wall thickness, and required tests	Specify the required code designation, edition, and applicable supplementary requirements

Can ASTM A106 Pipe Be Used in an ASME Project?

Yes, potentially. ASTM A106 pipe is commonly relevant to projects using ASME piping or pressure equipment codes. However, suitability depends on the applicable code, material listing, grade, temperature, design conditions, and project specification.
The purchasing team should verify the exact material designation and applicable edition rather than relying on the similarity of the names.

For code-governed pressure equipment, the material must satisfy the requirements of the governing construction code. A material certificate alone does not establish compliance of the complete system.

How to Choose Between ASTM and ASME Standards

ASTM and ASME are not usually alternatives from which a project chooses only one. The appropriate documents are selected according to the function each standard must perform.

1. Identify the Intended Application
Determine whether the product will be used for structural support, general fluid transport, high-temperature service, process piping, or pressure equipment.
Different applications have different requirements for material properties, manufacturing methods, design conditions, and inspection.

2. Confirm the Material Specification
Check the required ASTM or ASME material designation, grade, manufacturing method, and applicable edition.
Do not substitute a welded pipe for a specified seamless pipe, or one grade for another, without confirming that the substitution is permitted by the governing documents and approved by the responsible project authority.

3. Verify Pipe Size and Wall Thickness
Confirm the nominal pipe size, outside diameter, wall thickness or schedule, length, and applicable dimensional standard.
For example, ASME B36.10M is commonly referenced for carbon steel pipe dimensions, while ASME B36.19M covers stainless steel pipe dimensions.
A schedule number alone does not establish the pipe's material grade or allowable operating pressure.

4. Review the Applicable Design Code
For pressure piping or pressure equipment, identify the code required by the project, jurisdiction, and intended service.
The applicable code may specify permitted materials, design calculations, fabrication rules, examination, testing, and documentation.

5. Check Inspection and Documentation Requirements
Before placing an order, confirm which documents are required, such as material test reports, chemical analysis results, mechanical test results, inspection records, and traceability information.
Additional testing, third-party inspection, or certification may be required by the purchase order or governing code.

6. Confirm Edition and Compliance
Always identify the applicable edition and any addenda or project-specific amendments where required.
A pipe meeting an older edition does not automatically meet the latest edition or a project's specified edition. Any proposed deviation should be reviewed and approved through the project's formal technical process.