IEC 60404-8-10:2009

Overview

IEC 60404-8-10:2009 is an international standard published by the International Electrotechnical Commission (IEC) that specifies the requirements for magnetic materials-specifically iron and steel-intended for use in relays. This second edition, replacing the 1994 version, introduces important technical updates, including the inclusion of ferritic stainless steels and fully-processed material states. It defines accepted materials such as pure iron, non-alloyed and alloyed steels, and ferritic stainless steel products, generally supplied in semi-processed or fully-processed conditions. The standard provides comprehensive guidance on magnetic properties, geometric characteristics, tolerances, and inspection procedures tailored specifically to relay applications.

Key Benefits:

• Ensures high-quality magnetic materials suitable for relay manufacturing
• Standardizes magnetic and physical properties for consistency across suppliers
• Enhances reliability and performance of relay components

Key Topics

Material Classification and Scope

• Applies to classes A, B, C, and D.3 as per IEC 60404-1 classifications
• Covers pure iron, various steels, and ferritic stainless steel materials
• Specifies conditions for semi-processed and fully-processed states

Designation and Grades

• New material designation system starting with the letter "R"
• Introduction of new grades R160 and R320 to address varying coercivity needs
• Details on production methods and supply forms including strip, sheet, plate, flats, bars, wire rod, and wire

Magnetic and Physical Requirements

• Defined magnetic properties such as coercivity critical for relay function
• Geometric characteristics including thickness, width, flatness, straightness, and length with stringent tolerances
• Requirements for surface condition and heat treatment, especially for semi-processed materials

Inspection and Testing Procedures

• Clear instructions on selecting representative samples for testing
• Test methods covering coercivity, dimensional checks, flatness measurements, and straightness
• Procedures for retesting and managing complaints to assure material conformity

Applications

IEC 60404-8-10:2009 directly supports the manufacturing and quality control of electromagnetic relays, which rely on precise magnetic properties in their iron and steel components. By adhering to this standard, manufacturers can:

• Ensure relay components operate reliably under specified electromagnetic conditions
• Maintain uniformity in magnetic responses, reducing variability in relay performance
• Select appropriate materials that meet both magnetic efficiency and mechanical tolerance requirements
• Facilitate global sourcing and interoperability from suppliers adhering to recognized international standards

Beyond relays, these magnetic materials can also find relevance in other electromagnetic devices demanding similar magnetic quality and mechanical precision. However, the standard’s primary focus remains on materials developed for relay applications.

Related Standards

IEC 60404-8-10 forms part of the broader IEC 60404 series, which addresses magnetic materials in general. Other related standards in this family that may be of interest include:

• IEC 60404-1: Specification of general requirements and definitions for magnetic materials
• IEC 60404-2: Methods of measurement for magnetic properties
• Standards related to magnetic materials classification and testing procedures for other electrical and electronic applications

Additionally, the standard aligns with ISO steel standards, reflecting its collaborative development with ISO Technical Committee 17 on Steel, ensuring harmonized specifications across material definitions and processing.

By implementing IEC 60404-8-10:2009, suppliers, manufacturers, and quality control specialists in the electrical and electronic industries can guarantee that magnetic materials used in relays meet stringent international quality and performance criteria, supporting the production of reliable and efficient electromagnetic devices globally.