Overview
ISO 5450:1980 is an international standard that specifies the requirements and conditions of delivery for ferrotungsten, a ferroalloy primarily used in steelmaking and foundry applications. Developed by ISO Technical Committee ISO/TC 132 (Ferroalloys), this standard defines essential criteria for the chemical composition, particle size, sampling procedures, testing methods, and logistics related to ferrotungsten supply.
Ferrotungsten, characterized by a tungsten content ranging from 70% to 85% by mass, is a critical master alloy for enhancing steel properties. Adherence to ISO 5450 ensures consistency, quality, and reliable delivery of this alloy to end users in the metallurgical industry.
Key Topics
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Definition and Scope
Ferrotungsten is defined as an iron-tungsten alloy, typically containing 70% to 85% tungsten, supplied primarily for steelmaking and foundry uses. The standard governs how ferrotungsten should be ordered, tested, packed, stored, and delivered.
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Consignment Constitution Methods
The standard outlines three methods of consignment constitution to accommodate different production and delivery scenarios:
- Tapped lot method: Single melt or part of a continuous tap.
- Graded lot method: Multiple melts combined into one designation.
- Blended lot method: Multiple crushed melts mixed and sized below 50 mm.
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Chemical Composition Requirements
Specific chemical limits are set for tungsten and usual impurities such as silicon, carbon, manganese, phosphorus, sulfur, arsenic, and others. Table 1 in the standard details exact permissible ranges for these elements under different ferrotungsten designations.
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Particle Size Classification
Ferrotungsten must be supplied either in lumps or crushed and screened particles, with defined particle size ranges and tolerances (Table 2). Particle sizing is crucial to ensure compatibility with steelmaking or foundry feeding systems.
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Sampling and Testing
Sampling must follow ISO 3713 for representativeness, and chemical analysis should be conducted preferably with standardized methods. Procedures for dealing with discrepancies in testing results-such as arbitration sampling and analysis-are specified to resolve disputes between supplier and purchaser.
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Delivery, Storage, and Packaging
The standard mandates packaging and storage methods that protect ferrotungsten from contamination, damage, and comply with international transportation regulations (including those for hazardous materials where applicable).
Applications
ISO 5450:1980 is primarily designed for steelmakers, foundries, and ferroalloy suppliers who require a reliable quality framework for ferrotungsten products. By following this standard, stakeholders can:
