ASTM E572 XRF Analysis of Steel
ASTM E572-13 involves the analysis of the stainless steel and alloys of steel by using wavelength dispersive X-ray fluorescence. This method is used for the determination of the elements like copper, manganese, silicon, sulfur, etc. The values stated in SI are considered standard.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
ASTM E572 XRF Analysis of Steel Overview
ASTM E572 is the standard test method for the analysis of stainless and alloy steels by wavelength dispersive X-ray fluorescence (WDXRF) spectrometry. The method determines the elemental composition of steel samples by measuring the characteristic X-ray fluorescence emitted when the sample is irradiated with a primary X-ray beam. Each element present emits X-rays at wavelengths unique to its atomic structure, and the intensity of each characteristic wavelength is proportional to the concentration of that element in the sample.
ASTM E572 covers a defined range of alloying elements commonly found in stainless and alloy steels – including chromium, nickel, molybdenum, manganese, silicon, copper, cobalt, and others – and specifies calibration procedures using certified reference materials to ensure quantitative accuracy across the applicable concentration ranges.
ASTM E572 XRF Analysis of Steel Scope, Applications, and Benefits
Scope
ASTM E572 applies to solid stainless and alloy steel samples prepared as flat, polished discs or coupons suitable for direct XRF analysis. The method covers:
- Stainless steel grades — austenitic, ferritic, martensitic, and duplex stainless steels
- Alloy and tool steels — steels containing significant additions of chromium, nickel, molybdenum, vanadium, and other alloying elements
- Elemental ranges — quantitative determination of major and minor alloying elements within the concentration ranges established by the calibration standards used
Applications
- Incoming material verification — confirming that received steel stock matches its specified grade and alloy composition
- Positive material identification (PMI) — verifying alloy grade prior to fabrication, welding, or installation in critical service applications
- Production quality control — monitoring melt chemistry and finished product composition against specification limits
- Certification and compliance documentation — generating composition data required for mill certifications and material test reports
- Failure investigation support — confirming or ruling out material substitution or off-specification composition as a contributing factor in component failures
Benefits
- Rapid, multi-element analysis — WDXRF simultaneously determines multiple alloying elements in a single measurement
- High accuracy and precision — wavelength dispersive detection provides better resolution and lower detection limits than energy dispersive XRF for many elements relevant to steel analysis
- Minimal sample preparation — solid metal samples require only surface preparation (grinding/polishing) rather than dissolution or digestion
- Traceable, standardized results — calibration against certified reference materials ensures results are traceable and comparable across laboratories
- Non-destructive — the sample surface is minimally affected, allowing retention of the specimen for further testing if required
ASTM E572 XRF Analysis of Steel Test Process
Prepare the Sample
Machine, grind, or polish the steel to create a flat, clean, representative surface.
1Calibrate the Instrument
Calibrate the WDXRF spectrometer using certified reference materials.
2Analyse and Calculate
Measure elemental fluorescence and convert the intensities into concentrations using calibration and matrix corrections.
3Verify and Report
Compare the composition with the steel grade specification and report the results.
4ASTM E572 XRF Analysis of Steel Technical Specifications
| Parameter | Details |
|---|---|
| Typical Elements Determined | Chromium, nickel, molybdenum, manganese, silicon, copper, cobalt, vanadium, and other alloying elements |
| Sample Form | Flat, polished solid disc or coupon |
| Calibration Requirement | Certified reference materials spanning the applicable concentration range |
| Result Parameters | Elemental composition (weight percent) for each analyzed element |
| Related Standards | ASTM E1085, ASTM E1806 (sampling), ASTM A751 (chemical analysis requirements for steel products) |
Instrumentation Used for ASTM E572 XRF Analysis of Steel
- Wavelength dispersive X-ray fluorescence (WDXRF) spectrometer
- X-ray tube source (typically rhodium or similar anode material)
- Analyzing crystals and collimators for wavelength discrimination
- Certified reference material (CRM) standards for calibration
- Surface preparation equipment — grinder/polisher for producing analysis-ready sample surfaces
- Spectrometer software for intensity-to-concentration conversion and matrix correction
ASTM E572 XRF Analysis of Steel Results and Deliverables
- Test report — documentation of sample identification, preparation method, instrument calibration reference, and measured results
- Elemental composition data — weight percent concentration of each analyzed alloying element
- Grade conformance assessment — comparison of measured composition against the applicable steel grade specification limits
- Pass/fail determination — compliance assessment where acceptance criteria are defined in a purchase specification or material standard
Frequently Asked Questions
The steel specimen is exposed to primary X-rays, causing its elements to emit characteristic secondary X-rays. The wavelength-dispersive spectrometer separates and measures these signals to determine elemental concentrations.
The specimen surface is normally ground or machined to produce a clean, flat and representative testing area. Rust, coatings, scale and surface contamination must be removed before measurement.
The instrument is calibrated using reference materials with certified compositions similar to the steels being tested. Certified steel reference materials are also used to validate analytical methods and laboratory calibration.
Surface condition, specimen homogeneity, calibration quality, spectral overlap and matrix effects can influence accuracy. Instrument stability and the use of composition-matched reference materials are also important.
Carbon is not included among the elements covered by ASTM E572. Combustion methods, such as those described in ASTM E1019, are generally used when carbon determination is required.
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