A spectrometric analysis report displays columns of chemical symbols, percentages, and the identification of a steel grade. However, one must still know how to interpret a 0.3% deviation in molybdenum or the absence of a carbon value in the report.
Contents of a Spectrometric Analysis Report
Generated by a portable device (field XRF) or a laboratory spectrometer, the report presents the measured chemical composition of a metal sample. It generally includes the same categories of information.
The header identifies the service: date of analysis, operator or company, equipment used, method (X-ray fluorescence, optical emission, etc.), and sample reference number. This data ensures traceability: it links the report to a specific batch of material, a purchase order, or a specific production lot.
The composition table is the core of the report. It lists the chemical elements detected (Fe, Cr, Ni, Mo, Cu, Ti, Co, Mn, Si, etc.) along with their concentrations in mass percent (% or wt%). Some reports include a column showing the measurement uncertainty for each element.
The identified grade (“grade match”) is the alloy designation that the device associates with the measured results, based on a match with its internal database: for example, CuBe2, Inconel 625, Ti Gr.5. This identification is based on a comparison between the measured composition and the standard ranges for each grade.
Comments or observations indicate any unusual characteristics: oxidized surface, short acquisition time, or a component that cannot be measured using the method in question.
Reading the chemical composition element by element
Each row of the table lists a chemical element and its concentration in the sample, expressed as a mass percentage. A value of Cr = 17.2% means that chromium accounts for 17.2% of the total mass of the analyzed sample.
The weight of each element varies depending on the alloy. For an aluminum bronze, the key elements are copper and aluminum. For a Grade 5 titanium alloy (Ti-6Al-4V), the aluminum-to-vanadium ratio is critical.
The analysis must therefore focus primarily on the major elements contributing to the expected composition, verifying that they fall within the range specified by the applicable standard (ASTM, EN, DIN, UNS). Trace elements—those below 0.1%—sometimes play a decisive role: sulfur and phosphorus, for example, are limited in most steels because they make the metal brittle even at very low concentrations.
How do you compare the results to the standard ranges for a specific grade?
This is the most important step: comparing the measured composition with the limits specified by the reference standard for the grade. Each alloy designation is defined by a composition range for each element. As long as all measured values fall within these ranges, the material is compliant.
What does measurement uncertainty mean, and how should it be interpreted?
No physical measurement is perfectly accurate. Measurement uncertainty, often denoted by “±” in the report, quantifies the margin of error associated with each value.
On a portable XRF analyzer, the typical uncertainty is in the range of ±0.1 to 0.5% for major elements (present at concentrations greater than 1%), and can reach ±0.01 to 0.05% for elements with low concentrations. A laboratory optical emission spectrometer (OES) generally offers greater precision, with uncertainties in the range of ±0.01% for major elements.
According to Thermo Fisher Scientific, a leading manufacturer of analytical instruments, the latest generation of portable XRF analyzers achieve detection limits in the range of 10 to 50 ppm (parts per million) for most transition elements in metal alloys (2025 data).
In practice, this uncertainty must be taken into account when the measured value is very close to a regulatory limit. If the standard requires Mo ≥ 2.0% and the report shows Mo = 2.02% ± 0.15%, the actual value could fall between 1.87% and 2.17%. In this case, an additional laboratory measurement (OES or ICP) is recommended to resolve the uncertainty.
How do you identify a value that is outside the tolerance range?
A value outside the tolerance range is a result that falls outside the standard range for the identified grade. It is sometimes highlighted in red or bold on the report, but this is not always the case. Manual verification remains essential.
The method is simple. For each element in the composition table, compare the measured value to the range specified by the grade standard. There are three possible scenarios.
The value is within the range. The item is compliant. No action required.
The value is outside the range, but the deviation is small, and measurement uncertainty could explain the discrepancy. The material falls into a gray area. A confirmatory analysis using a laboratory method (OES or ICP-OES) will provide a definitive answer. This is the most common situation for elements with low concentrations or those near the limits.
The value is clearly outside the range. The material does not match the specified grade. This could be due to a labeling error, a mix-up of batches, or a different grade. In this case, the material must be isolated, and a traceability investigation must be initiated.
As stated in the EN 10204 standard regarding inspection certificate requirements, the correspondence between the measured chemical composition and the order specification is a fundamental acceptance criterion. Even a slight deviation can result in nonconformity during a quality audit, particularly for pressure equipment (DESP/PED Directive) or aerospace applications (EN 9100).
What the XRF report does not cover
X-ray fluorescence spectrometry is a powerful tool, but it has limitations that must be understood in order to interpret a report correctly.
Light elements. Portable XRF cannot reliably measure elements with atomic numbers below 12 (magnesium). Carbon (Z=6), nitrogen (Z=7), boron (Z=5), and sulfur (Z=16—measurable but with high uncertainty using portable XRF) are difficult or impossible to quantify using this method. However, carbon is a distinguishing element for many grades (316 vs. 316L, low-carbon steels). If carbon content is critical for your application, additional analysis by OES or combustion (LECO) is necessary. According to Malvern Panalytical, a specialist in analytical instrumentation, WD-XRF-type laboratory XRF spectrometers can measure elements starting with beryllium (Z=4), but portable ED-XRF devices remain limited to elements starting with magnesium (Z=12) under field conditions (technical documentation, 2025).
Mechanical properties. A chemical composition report provides no information on a metal’s tensile strength, yield strength, hardness, or toughness. These properties depend on heat treatment and microstructure, not solely on chemical composition. The EN 10204 Type 3.1 material certificate includes this data, but the spectrometric analysis report alone does not cover it.
Surface condition. An oxide layer, a coating, surface contamination, or a heat-affected zone can skew XRF measurements. If the report states “measurement taken on an unprepared surface” or “presence of oxide,” the results should be interpreted with caution. Lightly grinding the analysis area improves the reliability of the results.
Get the Most Out of Your Analysis Report
A spectrometric analysis report is not merely an administrative document. It is a decision-making tool that allows you to validate the receipt of materials, resolve uncertainties regarding unidentified inventory, or verify the compliance of a critical component.
To get the most out of it, keep these three practices in mind. Always check the measured composition against the specification limits for the grade you ordered. Take measurement uncertainty into account, especially when values are close to the thresholds. And identify the elements that the method used cannot measure, so you can supplement the analysis if necessary.
Specialist in nonferrous metals and specialty metals, Concept Métal performs chemical analysis of your metals using X-ray fluorescence spectrometry and provides you with a detailed report identifying the catalog grade. Contact our specialists for an analysis tailored to your needs.