Quantitative analysis of high-temperature alloy steels on a Rigaku Simultix simultaneous WDXRF spectrometer
Industrial large-scale metal alloy production houses have a crucial need for immediate analytical results. These
applications include both failure analysis for production issues and general quality/process control. The need for
fast, accurate, and precise analyses for industrial metallic applications is met with the Rigaku
Simultix, a
simultaneous wavelength-dispersive X-ray fluorescence (WDXRF) spectrometer. The total analysis time for the high-temperature alloy
application below was less than one minute due to the speed-minded geometry in the dedicated analysis channels on a
simultaneous WDXRF spectrometer.
The standards listed in Table 1 were used to generate a quantitative calibration method, based on
Rigaku's Fundamental Parameters, to analyze a high temperature alloy metallic product.
|
High-temperature alloys: NBS(NIST) |
1184, 1185, 1187, 1189 |
|
High-temperature alloys: NBS(NIST) |
1207-1, 1207-2, 1208-1, 1208-2 |
|
High-temperature alloys: JAERI |
R2, R5, R6, R7 |
|
Stainless steels: JSS |
JSS650-11, JSS651-11, JSS652-11, JSS653-11, JSS654-11, JSS655-11 |
|
Stainless steels: NBS(NIST) |
D845, D846, D847, D848, D849, D850 |
|
Austenite stainless steel: BAS |
BAS61, BAS62, BAS63, BAS64, BAS65, BAS66, BAS67, BAS68 |
Table 1
The high degree of accuracy achievable with a quantitative calibration of this scale can be seen in Table 2 for the entire major, minor, and trace analyte suite in a high-temperature alloy steel.
|
Element |
Concentration range |
Accuracy |
|
Mn |
0.082-2.13 |
0.03 |
|
Si |
0.075-1.42 |
0.02 |
|
Cr |
2.99-25.6 |
0.08 |
|
Ni |
0.28-74.2 |
0.11 |
|
Co |
0.011-20.8 |
0.04 |
|
Mo |
0.014-4.5 |
0.01 |
|
W |
0.04-2.40 |
0.01 |
|
Nb |
0.001-5.38 |
0.01 |
|
Ti |
0.001-3.09 |
0.02 |
|
Al |
0.005-1.39 |
0.03 |
|
Fe |
1.40-85.5 |
0.17 |
|
P |
0.001-0.035 |
0.003 |
|
S |
0.002-0.028 |
0.002 |
|
Cu |
0.0031-0.39 |
0.008 |
|
Ta |
0.001-0.048 |
0.008 |
Table 2
The analytical precision has also been calculated based upon a 10 run repeatability routine, and displayed in Table 3 for all 15 elements.
|
Element |
Typical value |
Standard |
Coefficient of |
|
Mn |
0.81 |
0.0005 |
0.06 |
|
Si |
0.92 |
0.0009 |
0.10 |
|
Cr |
20.3 |
0.005 |
0.02 |
|
Ni |
72.6 |
0.005 |
0.007 |
|
Co |
0.06 |
0.0002 |
0.28 |
|
Mo |
0.05 |
0.0003 |
0.55 |
|
Nb |
4.98 |
0.0016 |
0.03 |
|
Ti |
2.52 |
0.001 |
0.04 |
|
Al |
1.21 |
0.0015 |
0.14 |
|
Fe |
1.40 |
0.002 |
0.14 |
|
P |
0.003 |
0.00013 |
2.62 |
|
S |
0.007 |
0.0002 |
1.63 |
|
Cu |
0.077 |
0.0002 |
0.28 |
|
Ta |
0.012 |
0.0009 |
6.00 |
Table 3
In summation, the high degree of accuracy (down to 200 ppm) and the stability demonstrated in the precision statistics (not greater than 1.6 % C.V. except in extreme traces like Ta) efficiently demonstrates the superior ability to get a fast (under 1 minute total analysis time), reliable high-temperature metal alloy analysis on a simultaneous WDXRF spectrometer like the Rigaku Simultix, through a fundamental parameters-based quantitative calibration routine.
Tags: WDXRF, Simultix, simultaneous XRF, high-temperature, alloys
