Metal Chemical Composition Analysis Test Report Process
Date：2026-03-12 09:56:55 Classification
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According to current industry standards and general laboratory specifications, the process for obtaining a chemical composition analysis test report for metallic materials typically includes the following six key steps:
1. Preliminary Consultation and Needs Confirmation
Before submitting samples, the purpose of the test must be clearly defined, as this directly determines the testing standards and methods:
Material Grade Determination: Confirm whether the material is a specific grade such as 304, 316L, or 6061 aluminum alloy.
Elemental Quantitative Analysis: Determine the specific content of specific elements (such as C, Si, Mn, P, S, Cr, Ni, etc.).
Compliance Testing: Determine whether the material meets the requirements of specific standards such as GB, ASTM, and ISO.
Failure Analysis: Investigate the composition to identify causes such as corrosion and fracture.
2. Sample Submission and Application Completion
Sample Requirements:
Solid Block: Suitable for direct-reading spectroscopic methods. Generally, the sample diameter should be >10mm, thickness >5mm, with a smooth and clean surface, free of oxide scale, oil, or coatings.
Debris/Powder: Suitable for chemical methods or ICP-OES analysis, typically requiring 5-10g.
Application Form: Sample name, estimated material grade, testing items, applicable standard (e.g., GB/T 4336, ASTM E1251), and report language requirements are required.
3. Initial Inspection and Quotation
After receiving the sample, the laboratory will conduct a visual inspection to confirm that the sample condition meets the testing conditions and issue a formal quotation based on the testing items (full element analysis or specified element analysis) and difficulty level. After the customer confirms the quotation and signs it back, the testing process will begin.
4. Laboratory Testing and Analysis
This is the core step. Commonly used methods are as follows:
Spark Discharge Atomic Emission Spectroscopy (Direct Reading Spectroscopy):
Applicable to: * Rapid quantitative analysis of matrix materials such as iron, aluminum, copper, and zinc.
Process: * Sample polishing -> Excitation source -> Detection of characteristic spectral lines -> Computer-aided quantitative analysis.
Features: * High speed (results in minutes), capable of simultaneously determining multiple elements such as C, Si, Mn, P, and S.
Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES):
Applications: * High-precision analysis, trace element analysis, high-alloy steel, titanium alloys, etc.
Process: * Sample digestion (dissolution) -> Nebulization -> Plasma excitation -> Determination.
Features: * High sensitivity, wide linear range, suitable for detecting trace metal elements.
Other methods: Carbon-sulfur analyzer (specifically for detecting C and S), oxygen-nitrogen-hydrogen analyzer (for detecting gaseous elements).
5. Data Processing and Report Preparation
After testing, engineers calculate and round the raw data, compare the results against standards to determine compliance, and prepare a test report. The report typically includes:
Sample information and testing standards.
Measured values of each chemical element.
Standard requirement values (if any) and individual judgment conclusions.
Necessary spectral or data attachments.
6. Report Review and Issuance
After the report has been reviewed and confirmed by the authorized signatory, it will be stamped with the seals of CMA (China Metrology Accreditation), CNAS (China National Accreditation Service for Conformity Assessment), and the testing seal. Reports are typically delivered to clients in both electronic (PDF) and hard copy formats.
Appendix: Timeframe and Precautions
Testing Timeframe:
Routine Testing: Typically 3-5 business days.
Precautions:
Before submission, please ensure that all plating, oxide scale, or oil stains are removed from the sample surface to avoid affecting the accuracy of the test (especially for carbon and sulfur elements).
If there are any objections to the results, a retesting application can be submitted within the specified timeframe (usually 15 business days) after receiving the report.
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