GB/T 36226-2018 English PDF (GBT36226-2018)

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GB/T 36226-2018: Stainless steel -- Determination of manganese, nickel, chromium, molybdenum, copper and titanium -- Handheld energy dispersive X-Ray fluorescence spectrometric method (semiquantitative method)
GB/T 36226-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.080.20
H 11
Stainless Steel – Determination of Manganese, Nickle,
Chromium, Molybdenum, Copper and Titanium –
Handheld Energy Dispersive X-Ray Fluorescence
Spectrometric Method (Semiquantitative Method)
ISSUED ON. MAY 14, 2018
IMPLEMENTED ON. FEBRUARY 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Principle ... 5
4 Reagents and Materials ... 5
5 Apparatus ... 5
6 Sampling and Sample Preparation ... 5
7 Instrument Preparation ... 6
8 Analytical Procedures ... 6
9 Calculation of Results ... 7
10 Precision ... 7
11 Test Report ... 9
Appendix A (Informative) Precision Test Sample ... 11
Stainless Steel – Determination of Manganese, Nickle,
Chromium, Molybdenum, Copper and Titanium –
Handheld Energy Dispersive X-Ray Fluorescence
Spectrometric Method (Semiquantitative Method)
1 Scope
This Standard specifies using handheld energy dispersive X-ray fluorescence
spectrometric method to determine the contents of manganese, nickel, chromium,
molybdenum, copper and titanium.
This Standard is applicable to the semiquantitative analysis of the manganese, nickel,
chromium, molybdenum, copper and titanium in the block-shaped stainless-steel
sample; the determination range of each element can refer to Table 1.
Table 1 – Elements and Determination Ranges
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 6379.1 Accuracy (Trueness and Precision) of Measurement Methods and
a The specified content range indicates that a precision test has been performed; it may also be applicable exceeding this range, but it needs
to be confirmed by the laboratory.
Names of elements Determination range a (mass fraction)/%
Manganese
Nickel
Chromium
Molybdenum
Copper
Titanium
Results - Part 1. General Principles and Definitions
GB/T 6379.2 Accuracy (Trueness and Precision) of Measurement Methods and
Results - Part 2. Basic Method for the Determination of Repeatability and
Reproducibility of a Standard Measurement Method
GB/T 31364 Test Methods for Main Performance of Energy Dispersive X-Ray
Fluorescence Spectrometer
3 Principle
The sample is excited by high-energy X-ray; each element in the sample emits a
characteristic X-ray fluorescence spectrum. The preliminary contents of manganese,
nickel, chromium, molybdenum, copper and titanium in the sample shall be calculated
from the calibration curve by measuring the characteristic X-ray intensity produced.
Finally, the test results are corrected by testing the similar certified standard
substance/standard sample and using the deviation between the certified value of the
element in the certified standard sample/standard substance and the measured value.
4 Reagents and Materials
A set of certified standard substance/standard sample. When using for daily analysis
and drawing calibration curve, the content of each measured element in the selected
series of certified standard substance/standard sample shall cover the analysis range
and have a gradient; when using for correcting the drift of the instrument, the selected
standard sample/standard substance does not necessarily have certificate, but shall
have good uniformity.
5 Apparatus
Handled energy dispersive X-ray fluorescence spectrometer. X-ray tube power ≥ 2W;
the resolution ≤ 180eV.
6 Sampling and Sample Preparation
The diameter of the effective to-be-tested area of the sample to be tested shall be
larger than the diameter of the measurement area selected by the instrument; it is
recommended that the diameter of the to-be-tested area shall be no less than 10mm.
The certified standard substance/standard sample, analytical sample shall be ground
and cleaned under the same conditions. The surface of the sample shall be smooth,
point shall be no less than 30s; take the average value. If necessary, select the
standard sample/standard substance with the similar compositions to correct the
measurement result of the to-be-tested sample. According to experience, the proximity
of between selected certified standard substance/standard sample and the to-be-
tested sample shall refer to the following requirements.
a) Main elements (≥1%). the content difference between certified standard
substance/standard sample and to-be-tested sample shall not exceed ±10%.
b) Trace elements (< 1%). the content difference between certified standard
substance/standard sample and to-be-tested sample shall not exceed ±50%.
According to the instructions requirements of the instrument, check the instrument
periodically; so that correct the daily drift of the instrument.
9 Calculation of Results
According to the fluorescence intensity of the tested element in the sample, calculate
the content of the to-be-tested element through the calibration curve.
The analysis results of the tested elements shall be within the content range covered
by the calibration curve.
The measurement results shall be reported in the form of mass fraction (%); in general,
when the analytical content in the calculation results is greater than or equal to 1%,
retain two digits after the decimal point; when it is less than 1%, retain three digits after
the decimal point.
10 Precision
The precision test of this Standard is carried out by 10 labs for the contents of 4 levels
of manganese, 6 levels of nickel, 4 levels of chromium, 4 levels of molybdenum, 5
levels of copper and 3 levels of titanium; each lab shall test 3 times against each level
of element under the repeatability conditions specified in GB/T 6379.1. The
participating labs pass and analyze 29 to-be-tested samples and standard samples
with similar contents; correct and calculate the results of the to-be-tested sample; the
correcting mode can refer to Table 8. The samples used for the precision test can refer
to Appendix A. The original data shall be statistically analyzed according to GB/T
6379.2; the precision test results of each element shall refer to Table 2 ~ Table 7.