ASTM B968/B968M-16(2022) PDF

Overview

ASTM B968/B968M-16(2022), Standard Test Method for Flattening of Copper and Copper-Alloy Pipe and Tube, is an internationally recognized method published by ASTM International. This standard specifies the flattening test procedures for copper and copper-alloy pipes and tubes of all sizes, encompassing both seamless and welded products. It defines requirements for sample preparation, testing, and evaluation of ductility, weld seam integrity, and surface defects. Designed for use with both inch-pound and SI (metric) units, ASTM B968/B968M ensures global applicability and aligns with international principles on standardization.

Key Topics

• Scope and Applicability Specifies requirements for flattening tests on copper and copper-alloy pipes and tubes, covering various diameters and product forms. Applies to quality assessment of pipes and tubes used in plumbing, heating, industrial, and structural applications.

• Testing Procedures Outlines sample preparation, use of hydraulic or mechanical presses for flattening, and specific requirements for seamless and welded products. Emphasizes inspection of flattened areas for evaluating ductility and detecting surface defects or weld seam integrity.

• Units of Measurement The standard provides and distinguishes between inch-pound and SI units. To ensure conformance, all measurements and evaluations must be performed using one consistent system without mixing.

• Safety and Compliance Highlights user responsibility to address safety, health, and environmental considerations when applying the test method, in accordance with applicable regulatory requirements.

• Test Reporting Encourages consistent documentation, including evidence of pass or fail status regarding defects, sample identification, date of test, and relevant test method references.

Applications

ASTM B968/B968M is widely used in the manufacturing and quality control of copper and copper-alloy pipe and tube, ensuring they meet mechanical properties and performance standards for their intended use. Typical applications include:

• Assessment of Material Ductility The flattening test provides critical data on the ductility of pipes and tubes, informing suitability for bending, coiling, or forming operations in manufacturing and construction.

• Evaluation of Weld Integrity For welded tubes, the test can reveal potential weaknesses or discontinuities in the weld area, which is essential for products expected to perform under pressure or in corrosive environments.

• Surface Defect Detection By exposing the tube or pipe to mechanical stress, the flattening process highlights surface imperfections or internal flaws that could affect product reliability.

• Specification Compliance Used by manufacturers, third-party laboratories, and inspectors to verify that products comply with relevant product specifications, codes, and international trade requirements.

Related Standards

For a comprehensive approach to quality assurance in copper and copper-alloy pipe and tube production, ASTM B968/B968M references and relates to several other ASTM standards:

• ASTM B153: Test Method for Expansion (Pin Test) of Copper and Copper-Alloy Pipe and Tubing - an alternative test for larger diameter tubes.
• ASTM B846: Terminology for Copper and Copper Alloys - provides definitions supporting standardized testing.
• ASTM B950: Guide for Editorial Practices - referenced for document formatting and clarity.

These standards, together with ASTM B968/B968M, form a robust framework for the quality control, inspection, and certification of copper pipe and tube products in the global market.

Keywords: ASTM B968, flattening test, copper pipe, copper tube, copper-alloy, welded pipe, welded tube, ductility testing, weld seam integrity, surface defects, quality control, international standard, plumbing, manufacturing, SI units, inch-pound units, ASTM standards.