This standard specifies the infrared absorption method for determining carbon content. This standard is applicable to the determination of carbon content in silicon aluminum alloys and silicon-barium aluminum alloys. Determination range: 0.10% (m/m) ~ 0.50% (m/m). YB/T 178.6-2000 Chemical analysis method for silicon aluminum alloys and silicon-barium aluminum alloys Infrared absorption method for determining carbon content YB/T178.6-2000 Standard download decompression password: www.bzxz.net

YB/T 178. 6--2000
Silicon aluminum alloy and silicon barium aluminum alloy are highly effective deoxidation, desulfurization or grain refinement additives. This industry standard is formulated to match its product standards.
During the formulation of this standard, the focus is on studying the effects of fluxes such as tin particles, pure iron and tungsten particles on sample melting and the absorption integral curve of carbon.
YB/T178 includes the following parts under the general title of "Chemical Analysis Methods for Silicon Aluminum Alloys and Silicon Barium Aluminum Alloys", and this standard is Part 6.
1) Determination of silicon content by perfluoric acid dehydration weight method 2) Determination of barium content by barium sulfate weight method
3) Determination of aluminum content by EDTA titration
4) Determination of manganese content by sodium periodate spectrophotometry 5) Determination of phosphorus content by phosphomolybdenum blue spectrophotometry 6) Determination of carbon content by infrared absorption method
7) Determination of sulfur content by infrared absorption method
This standard is proposed and managed by the Metallurgical Information Standard Research Institute. The drafting unit of this standard: Xinyu Iron and Steel Co., Ltd. The main drafters of this standard: Duan Qingguo, Fu Tao, Jia Bin, Fang Nanhui, Fan Qing. 675
1 Scope
Ferrous Metallurgy Industry Standard of the People's Republic of China Methods for Chemical Analysis of Silicon-Aluminium Alloy and Silicon-Barium-Aluminium Alloy The infrared absorption method for the deterrnination of carbon content
Methods for chemical analysis of silicon-aluminium alloy and silicon-barium-aluminium alloy The infrared absorption method for the deterrnination of carbon content This standard specifies the infrared absorption method for the determination of carbon content. This standard is applicable to the determination of carbon content in silicon-aluminium alloy and silicon-barium-aluminium alloy. Determination range: 0.10% (m/m) to 0.50% (m/m). 2 Referenced Standardsbzxz.net
YB/T 178.6--2000
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is released, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T4010--1994 Collection and preparation of samples for chemical analysis of ferroalloys 3 Method Summary
The sample is heated and burned in the oxygen flow of a high-frequency induction furnace. The generated carbon dioxide is carried by oxygen to the measuring chamber of the infrared detector. Carbon dioxide absorbs infrared energy of a certain wavelength. Its absorption energy is proportional to the concentration of carbon. The carbon content can be measured according to the measurement value of the detector. 4 Reagents and materials
4.1 Acetone: The carbon content in the residue after evaporation is less than 0.005% (m/m). 4.2 Magnesium perchlorate: anhydrous, granular.
4.3 Caustic soda stone ladder: granular.
4.4 Tungsten particles: carbon content less than 0.002% (m/m), particle size 0.8mm~1.4mm. 4.5 Tin particles: carbon content less than 0.002% (m/m), particle size 0.2mm~0.8mm. If necessary, clean the surface with acetone (4.1) and dry at room temperature.
4.6 Pure iron: carbon content less than 0.002% (m/m). 4.7 Glass wool.
4.8: Oxygen: purity greater than 99.95% (m/m), other levels of oxygen can also be used if a low and accurate blank can be obtained. 4.9 Power gas source: nitrogen, argon or compressed air, with impurity (water and oil) content less than 0.5% (m/m). 4.10 Crucible: diameter × height: 23mm × 23mm or 25mm × 25mm, and burned in a high-temperature furnace above 1200℃ for 4h or burned with oxygen until the blank value is the lowest.
4.11 Barium carbonate: content not less than 99.5% (m/m), baked at 105℃～110C for 3h before use, and cooled in a desiccator. Approved by the State Metallurgical Industry Bureau on July 26, 2000, 676
Implementation on December 1, 2000
YB/T178.6—2000
4.12 Primer sample: Carbon content shall not exceed 0.05% (m/m) and shall match the sample matrix. 5 Instruments and equipment
5.1 Infrared absorption carbon determination instrument (sensitivity 0.1×10-5), its flow chart is shown in Figure 1: 200
1- oxygen cylinder; 2- two-stage pressure regulator; 3- gas washing bottle; 1.9- drying tube; 5- pressure regulator; 6- high-frequency induction furnace; 7- combustion tube; 8- dust removal tube; 10- flow controller: 11 converter for converting carbon monoxide to carbon dioxide; 12- desulfurizer: 13 carbon dioxide infrared detector Figure 1 Infrared absorption carbon determination instrument flow chart
5.1.1 Gas washing bottle: containing caustic soda asbestos (4.3). 5.1.2 Drying tube: containing magnesium perchlorate (4.2). 5.2 Gas source
5.2.1 The carrier gas system includes an oxygen container, a two-stage pressure regulator and a timing control part to ensure the provision of appropriate pressure and rated flow. 5.2.2 The power gas source system includes power gas (4.9), two-stage pressure regulator and timing control part to ensure the provision of appropriate pressure and rated flow.
5.3 High frequency induction furnace
Should meet the requirements of sample melting temperature.
5.4 Control system
5.4.1 The microprocessor system includes central processing unit, memory, keyboard input device, information center display screen and analysis result printer, etc. 5.4.2 The control functions include automatic loading and unloading of worm and furnace lifting, automatic cleaning, analysis condition selection device, monitoring and alarm interruption of analysis process, collection, calculation, correction and processing of analysis data, etc. 5.5 Measurement system
Mainly composed of electronic balance (sensitivity not more than 1.0mg) controlled by microprocessor, infrared analyzer and electronic measuring elements. 6 Sample preparation
Sample preparation shall be carried out in accordance with GB/T4010. The sample shall pass through a 0.125mm sieve and be stored in a sealed dry container for 6 months.
7 Analysis steps
7.1 Sample quantity
Weigh 0.20g of sample, accurate to 0.001g. 677
7.2 Blank test
Carry out a blank test with the sample.
7.3 Analysis preparation
YB/T 178.6--2000
Debug and check the instrument to make it in a normal and stable state, and select the best analysis conditions. 7.4 Determination
Put the sample (7.1) evenly in a crucible (4.10) pre-filled with 0.5g of tin particles (4.5) as the bottom and covered with 0.3g of pure iron (4.6), and then evenly cover it with 0.2g of pure iron (4.6) and 1.5g of tungsten particles (4.4) in turn, and perform the determination, and read the displayed value minus the blank, and find the carbon content from the calibration curve.
Clean the dust in the instrument after each analysis. 7.5 Drawing of calibration curve
Add 0.5g tin particles (4.5), 0.3g pure iron (4.6), 0.2g primer (4.12) to the six (4.10) in sequence, then add 0, 1.30.3.266.51, 13.03, 19.54mg strontium carbonate (4.11), then add 0.2g pure iron (4.6), 1.5g tungsten particles (4.4) in sequence, and measure. Draw the calibration curve with the carbon content as the horizontal axis and the displayed value minus the blank as the vertical axis. 8 Calculation of analysis results
Calculate the mass percentage of carbon according to formula (1): mi × 100
c(%) =
Where: m.-the amount of carbon obtained from the calibration curve, g: m-
——the amount of sample.
Analysis results should be expressed to two decimal places. 9 Allowable difference
The difference between two independent analysis results should not be greater than the allowable difference listed in Table 1. Table 1
Carbon content
0. 10~0.30
>0.30~0.50
10Test report
The test report should include the following contents:
a) Identification of the test material, laboratory and analysis date; b) The degree of compliance with the provisions of this standard;
c) Analysis results and their expression;
d) Abnormal phenomena observed during the measurement;
Allowance
e) Operations that may affect the analysis results but are not included in this standard, or optional operations. 678
%(m/m)
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