Metal composition analysis and testing
Date：2025-02-26 10:17:37 Classification
：【question】 Visits：
The metal composition analysis and testing process is a key link to ensure material performance and quality. It is mainly divided into the following steps, which are summarized as follows in combination with relevant testing standards and practical requirements:
I. Preliminary preparation
1. Select a testing agency
Preferably select a third-party testing agency with CNAS/CMA qualifications to ensure that it has advanced equipment, professional technicians and testing capabilities that meet ISO, GB/T, ASTM and other standards.
2. Demand confirmation and plan formulation
- Communicate with the agency on the purpose of testing (such as export compliance, quality control, etc.), material type (steel, aluminum alloy, etc.) and specific testing items (chemical composition, mechanical properties, etc.).
- Develop a test plan, clarify the testing methods (such as spectral analysis, chemical analysis), and implementation standards (such as GB/T 223, ASTM E34).
II. Sample processing
1. Sample collection and pretreatment
- Collect representative samples (such as blocks and chips) to avoid interference from impurities.
- Pretreatment includes cleaning, grinding, polishing or dissolving to ensure that the sample surface is clean or meets the instrument testing requirements.
2. Classification and Recording
- Classify according to material type (such as stainless steel, copper alloy) and purpose, and record the sample status (such as whether it is coated).
- Fill in the application form to clarify the sample information and testing requirements.
III. Testing and Analysis
1. Chemical Composition Analysis
- Chemical Analysis Method:
- Gravimetric method (weighing after separation of elements) and volumetric method (titration of standard solution), suitable for high-precision quantitative analysis.
- Instrumental Analysis Method:
- Spectroscopic analysis (such as atomic absorption spectroscopy, X-ray fluorescence) quickly determines the element content.
- Mass spectrometry (such as ICP-MS) is used for trace element detection.
2. Physical and Mechanical Performance Testing
- Physical properties: hardness (Rockwell/Brinell), density, conductivity, etc.
- Mechanical properties: tensile strength, ductility, impact toughness, etc., which need to be completed by equipment such as tensile testing machines.
3. Special Project Testing (on demand)
- Corrosion resistance: Salt spray test simulates harsh environment.
- Microstructure: Observe grain structure with metallographic microscope.
IV. Report generation and review
1. Data processing and report preparation
- The laboratory summarizes the data and generates a Chinese and English report containing sample information, test methods, result comparison and compliance conclusions.
- The report must indicate the standard (such as GB/T 20066) and the detection limit.
2. Quality control and review
- Implement internal audits to ensure data accuracy and process compliance.
- Provide technical interpretation and improvement suggestions (such as adjustment plans when the ingredients exceed the standard).
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