ASTM A34 Standard Practice for Sampling and Procurement Testing of Magnetic Materials

Get Certified ASTM A34 Testing for Reliable Magnetic Material Performance

In motors, generators, and transformers, magnetic properties have a direct impact on the performance and efficiency of electrical steels and soft magnetic alloys. ASTM A34 certification assures magnetic materials satisfy procurement specifications and quality requirements. Qualified laboratory testing offers accurate and repeatable sampling and test data to aid in material selection, quality control, and supplier qualification. 

The scope of ASTM A34 includes:

• Material type: The standard is ASTM A34, which includes soft and hard magnetic materials such as iron-based electrical steels and commercial soft magnetic alloys.
• Purpose: ASTM A34 specifies the number of test lots and defines the selection and preparation of test specimens for the determination of magnetic properties in procurement testing.
• Property measured: The practice enables measurements of a variety of magnetic properties, such as the density of iron-based electrical steels and presumed densities of soft magnetic alloys. 
• Method: ASTM A34 outlines the sampling methods, definitions of Test Lot, specimen selection, and specimen preparation methods. 
• Result: The testing laboratory receives magnetic property information from a representative sample, with suitable test specimens from a set of defined test lots. 
• Test Limitations: When used in conjunction with individual test methods and material specifications, the practice does not supersede them, but when used alone, it is applicable strictly.
• Environmental conditions: The practice applies to standard laboratory conditions for magnetic property testing. 
• Applications: The ASTM A34 is utilized during procurement testing, quality control, and supplier qualification of magnetic materials for electrical equipment and devices.

What are the Uses of ASTM A34?

ASTM A34/A34M testing provides laboratories with consistent magnetic property data to evaluate the quality of materials. Manufacturers and procurement engineers use the results for supplier qualification, quality control, and specification compliance. 

This standard-

• Test lots for procurement testing of magnetic materials are defined.
• Extracting and preparing test specimens for the determination of magnetic properties
• Calculating density of iron-based electrical steels
• Assisting with procurement decisions for soft & hard magnetic materials
• Providing consistency in magnetic testing across suppliers and lots 

Which materials can be tested under ASTM A34?

ASTM A34 applies to both soft and hard magnetic materials. The practice is for iron-based electrical steels and commercial soft magnetic alloys. The standard provides for procurement testing of materials for use in motors, generators, transformers, and other electromagnetic devices. 

Why is ASTM A34 Important?

ASTM A34 is a standard that establishes the sampling and procurement procedures for magnetic materials. The practice covers the identification of test lots and the selection and preparation of test specimens for the determination of magnetic properties. This standardization guarantees that magnetic property data from various suppliers and lots are comparable. The practice supports the procurement decision by providing established procedures for material evaluation and assists the manufacturer in controlling the specification of magnetic materials. 

ASTM A34 Testing Process and Data Collection

The first step in the testing process is to define test lots based on the practice requirements. Technicians take samples from the identified test lots. Analysts prepare test specimens according to the selection and preparation procedures provided in the standard. In the case of iron-based electrical steels, the density is computed following a stated procedure. Technicians use the table of assumed densities in the practice for commercial soft magnetic alloys. Technicians then conduct magnetic properties testing with the appropriate test methods under the jurisdiction of ASTM Committee A06. The data acquisition system collects the magnetic property data for procurement evaluation and quality assessment. 

Common Challenges and Troubleshooting in ASTM A34

Representative sampling and test lot definition are critical for accurate ASTM A34 results. A major challenge is to ensure that the samples are an adequate representation of the test lot, as well as preparing the specimens according to the individual requirements of the magnetic tests. To perform calculations for density of iron-based electrical steels, the method specified needs to be appropriately applied and accurate measurements taken. Reliable data is produced when laboratories have the correct sampling procedures, consistent specimen preparation, and follow the practice requirements for procurement testing. 

• Laboratory records test lot identification and sample selection information for traceability.
• The analyst provides the density of the iron-based electrical steels based on the method specified.
• The report records the magnetic property data obtained from experimental tests on the prepared specimens.
• Engineers compare the results with material specifications and procurement requirements to determine whether they meet compliance.
• ASTM A34 uses consistent sampling and testing for procurement. 

Link to ASTM A34