Unalloyed Magnesium Ingot and Stick For Remelting

B92/B92M-11: Standard Specification for Unalloyed Magnesium Ingot and Stick For Remelting

For engineers and manufacturers relying on high-purity magnesium for critical applications, ensuring the quality and consistency of raw materials is paramount. ASTM's B92/B92M-11: Standard Specification for Unalloyed Magnesium Ingot and Stick For Remelting provides the authoritative framework to achieve this, serving as an essential guide for sourcing and utilizing unalloyed magnesium in its ingot and stick forms.

What is B92/B92M-11?

This industry-leading standard, established by ASTM International, defines the requirements for unalloyed magnesium intended for remelting. Its primary purpose is to ensure that magnesium supplied in ingot and stick form meets stringent chemical composition and quality criteria, thereby guaranteeing predictable performance in subsequent alloying and manufacturing processes.

Scope & Purpose

The scope of B92/B92M-11 is comprehensive, covering the chemical composition, general quality, and forms of unalloyed magnesium ingot and stick designated for remelting. It details various grades of magnesium, each with specific impurity limits. The specification does not cover fabricated magnesium products or alloys with significant additions beyond trace elements. Its purpose is to provide a standardized basis for commercial transactions, ensuring that the purchased magnesium is fit for its intended remelting purpose.

Who Must Comply?

• • Primary audience: Metallurgists, Materials Engineers, Quality Control Inspectors, Production Managers, and Foundry Workers involved in the procurement and processing of magnesium.
• • Industries affected: Aerospace, Automotive, Electronics, General Manufacturing, and Metal Production industries that utilize magnesium alloys.
• • Compliance nature: This standard is typically voluntary, adopted by industry consensus and buyer-seller agreements, though it may become mandatory through contractual requirements.
• • Enforcement: Compliance is generally enforced through quality assurance processes, material testing, and audits by purchasers, with ASTM providing the recognized benchmark.

Key Requirements Overview

• • The standard requires that unalloyed magnesium ingot and stick conform to specific chemical composition limits for various grades, ensuring a baseline purity.
• • Professionals must ensure that the supplied material is commercially free from dirt, slag, and other foreign contaminants that could compromise the remelting process or final alloy properties.
• • Key provisions include the acceptance of only manufacturer-generated scrap in the production of new ingot and stick, promoting traceability and quality control.
• • The specification outlines requirements for sampling and analysis to verify chemical composition, particularly in cases of dispute.
• • It also addresses the acceptable forms (ingot and stick) and requires clear identification of the material's grade and quantity upon ordering.

Related Standards & References

B92/B92M-11 is often used in conjunction with ASTM B951 Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast and Wrought, which provides a system for designating these materials. Furthermore, ASTM E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications is referenced for accurate interpretation of analytical results, ensuring that material meets the defined compositional tolerances. For sampling procedures, **ASTM E88 Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination