Overview

ISO 629:1982 specifies a spectrophotometric method for the determination of manganese content in steel and cast iron. This internationally recognized standard covers the analysis of manganese in products with concentrations ranging from 0.001% to 4% by mass (m/m). Developed by ISO Technical Committee ISO/TC 17 (Steel), the method details the principles, reagents, apparatus, sampling procedures, and reporting requirements necessary for precise and reproducible manganese measurement.

This standard plays a crucial role in quality control, material certification, and metallurgical analysis by providing a reliable and validated procedure for chemical analysis of manganese, a key alloying element influencing steel and cast iron properties.

Key Topics

Scope and Applicability: Applicable to steel and cast iron products containing manganese between 0.001% and 4% by mass.
Principle of Method:
- Sample dissolution using a sulphuric/phosphoric acid mixture and nitric acid.
- Oxidation and formation of permanganate ions via treatment with sodium periodate.
- Measurement of absorbance at approximately 545 nm using a spectrophotometer.
Reagents and Solutions:
- High-purity reagents such as perchloric acid, sulphuric/phosphoric acid mixture, sodium periodate, and standard manganese solutions.
- Preparation of standard stock and working solutions for calibration.
Sampling Protocols:
- Sampling in line with ISO 37712 to ensure representative and consistent test portions.
Analytical Procedure:
- Test solution preparation involving precise weighing of test portions, acid digestion, oxidation, and dilution.
- Formation of colored compound with sodium periodate for spectrophotometric analysis.
- Use of compensation solution for baseline correction.
- Calibration using known manganese standards to construct a calibration curve or calculate the angular coefficient for absorbance.
Data Expression and Calculation:
- Calculation of manganese content expressed as a percentage by mass using a formula integrating absorbance, calibration slope, sample volume, pathlength, and test portion mass.
Test Reporting:
- Inclusion of method reference, numerical results with units, any deviations or observations, and indication of optional or modified operations.

Applications

ISO 629:1982 serves as a fundamental tool for industries and laboratories involved in:

Metallurgical quality control to verify manganese content in steel and cast iron ensuring material meets required specifications.
Research and development in alloy design, helping metallurgists understand and optimize manganese’s effect on mechanical and chemical properties.
Certification and compliance testing during production or import/export inspections to ensure adherence to international standards.
Spectrophotometric chemical analysis training, providing a standardized procedure for educational or technical training environments.

By following this method, organizations can achieve consistent manganese quantification, which is critical for controlling corrosion resistance, strength, and other performance attributes influenced by manganese.

Related Standards

ISO 37712: Deals with selection and preparation of samples and test pieces for chemical analysis of steel, referenced for sampling methodology in ISO 629.
Other chemical analysis standards related to metals may complement ISO 629 by covering different elements or alternative methods such as atomic absorption or X-ray fluorescence.

Keywords: ISO 629, manganese determination, spectrophotometric method, steel analysis, cast iron testing, manganese content measurement, chemical analysis standard, ISO/TC 17, spectrophotometry, metallurgical testing, manganese in steel, manganese in cast iron.

Overview

Key Topics

Scope and Applicability: Applicable to steel and cast iron products containing manganese between 0.001% and 4% by mass.
Principle of Method:
- Sample dissolution using a sulphuric/phosphoric acid mixture and nitric acid.
- Oxidation and formation of permanganate ions via treatment with sodium periodate.
- Measurement of absorbance at approximately 545 nm using a spectrophotometer.
Reagents and Solutions:
- High-purity reagents such as perchloric acid, sulphuric/phosphoric acid mixture, sodium periodate, and standard manganese solutions.
- Preparation of standard stock and working solutions for calibration.
Sampling Protocols:
- Sampling in line with ISO 37712 to ensure representative and consistent test portions.
Analytical Procedure:
- Test solution preparation involving precise weighing of test portions, acid digestion, oxidation, and dilution.
- Formation of colored compound with sodium periodate for spectrophotometric analysis.
- Use of compensation solution for baseline correction.
- Calibration using known manganese standards to construct a calibration curve or calculate the angular coefficient for absorbance.
Data Expression and Calculation:
- Calculation of manganese content expressed as a percentage by mass using a formula integrating absorbance, calibration slope, sample volume, pathlength, and test portion mass.
Test Reporting:
- Inclusion of method reference, numerical results with units, any deviations or observations, and indication of optional or modified operations.

Applications

ISO 629:1982 serves as a fundamental tool for industries and laboratories involved in:

Metallurgical quality control to verify manganese content in steel and cast iron ensuring material meets required specifications.
Research and development in alloy design, helping metallurgists understand and optimize manganese’s effect on mechanical and chemical properties.
Certification and compliance testing during production or import/export inspections to ensure adherence to international standards.
Spectrophotometric chemical analysis training, providing a standardized procedure for educational or technical training environments.

Related Standards

ISO 37712: Deals with selection and preparation of samples and test pieces for chemical analysis of steel, referenced for sampling methodology in ISO 629.
Other chemical analysis standards related to metals may complement ISO 629 by covering different elements or alternative methods such as atomic absorption or X-ray fluorescence.

ISO 629:1982 PDF

Technical details

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

Abstract

Overview

Key Topics

Applications

Related Standards

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