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GB/T 21931.2-2008 English PDF (GBT21931.2-2008)
GB/T 21931.2-2008 English PDF (GBT21931.2-2008)
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GB/T 21931.2-2008: Nickel, ferronickel and nickel alloys -- Determination of sulfur content -- Infrared absorption method after induction furnace combustion
GB/T 21931.2-2008
Nickel, ferronickel and nickel alloys - Determination of sulfur content - Infrared absorption method after induction furnace combustion
ICS 77.100
H11
National Standards of People's Republic of China
GB/T 21931.2-2008/ISO 7526.1985
Determination of sulfur content in nickel, nickel-iron and nickel alloys
High frequency combustion infrared absorption method
(ISO 7526.1985, IDT)
2008-05-30 released
Implementation of.2008-12-01
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Issued by China National Standardization Administration
Preface
This part of GB/T 21931.2-2008 is equivalent to ISO 7526.1985 "Determination of high sulfur content in nickel, ferronickel and nickel alloys
Frequency combustion infrared absorption method.
The technical content of this part is exactly the same as that of ISO 7526.1985.For ease of use, this part has been modified as follows.
a) The term "this International Standard" is changed to "this Part";
b) Use a decimal point "." to replace the comma "," as a decimal point;
c) Delete the foreword of the international standard;
d) National standards are adopted for normative references;
e) The contents of the crucible cover in the international standard have been deleted.
Appendix A and Appendix B of this section are informative appendices.
This part was proposed by the China Iron and Steel Association.
This part is under the jurisdiction of the Metallurgical Industry Information Standards Institute.
Drafting organization of this section. Shanxi Taigang Stainless Steel Co., Ltd.
The main drafters of this section. Dai Xueqian, Liu Wei, Zhang Ruilin.
GB/T 21931.2-2008/ISO 7526.1985
Determination of sulfur content in nickel, nickel-iron and nickel alloys
High frequency combustion infrared absorption method
Warning. The personnel using this section should have practical experience in formal laboratory work. This section does not point out all possible security issues.
The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated by relevant national laws and regulations.
1 scope
This part of GB/T 21931 specifies the high-frequency induction furnace combustion infrared absorption method for the determination of sulfur content in nickel, nickel-iron and nickel alloys.
This part is applicable to the sulfur content of nickel and ferronickel from 0.001% to 0.3% (mass fraction) and the sulfur content of nickel alloy from 0.001% to 0.1%
(Mass score) determination. See Appendix A for examples of ingredient composition.
2 Normative references
The clauses in the following documents have become clauses of this part by reference to this part of GB/T 21931.All dated quotations
All subsequent amendments (excluding errata content) or revisions do not apply to this section, however, it is encouraged to reach
The parties to the agreement study whether the latest versions of these documents can be used. For undated references, the latest version is applicable to this
section.
GB/T 63779.1 Measurement methods and accuracy of results (accuracy and precision) Part 1.General principles and definitions
(GB/T 6379.1-2004, ISO 5725-1..1994, IDT)
GB/T 63779.2 Accuracy of measurement methods and results (accuracy and precision) Part 2.Determine the repeatability of standard measurement methods
The basic method of performance and reproducibility (GB/T 6379.2-2004, ISO 5725-2.1994, IDT)
3 Principle
The sample, flux and accelerator are placed in a high-frequency induction furnace and burned at high temperature under oxygen flow. The generated sulfur dioxide is carried by oxygen to
In the infrared absorption cell, the sulfur content in the sample can be measured by using the infrared detector and the integration program to measure the amount of sulfur dioxide generated after combustion.
4 Reagents and materials
4.1 Oxygen, the purity is greater than 99.5% (mass fraction).
4.2 Caustic soda asbestos (or soda lime), particle size 0.7mm ~ 1.2mm (14 mesh ~ 22 mesh).
4.3 Magnesium perchlorate, particle size 0.7mm~1.2mm (14 mesh ~ 22 mesh).
4.4 Glass wool.
4.5 Crucible.
4.5.1 The size of the ceramic crucible must be accurate, so that the sample can fit in the induction coil of the furnace (see 9.1).
4.5.2 In a furnace with air or oxygen, pre-fire the crucible at a temperature of 1100°C for more than 1 h, and then store it in a desiccator or airtight container
in. A resistance furnace in which oxygen passes through the combustion tube can be used.
4.6 Flux. low-sulfur tin, copper plus tin, copper or vanadium pentoxide (see 9.2).
4.7 Accelerator. copper, iron, tungsten or nickel with low sulfur content (see 9.2).
4.8 Nickel. Known content, sulfur content (mass fraction) is less than 0.001%.
4.9 Steel standard samples. sulfur content (mass fraction) 0.1% to 0.2%.
5 Instruments
High-frequency induction burners and infrared absorption sulfur analyzers can be purchased from many manufacturers. The operation of the instrument follows the manufacturer's instructions
GB/T 21931.2-2008/ISO 7526.1985
book. According to the technical specifications of the manufacturer, a pressure regulator is required to control the pressure of oxygen entering the furnace (usually 28kN/m2). Characteristics of commodity instruments
See Appendix B for sex.
6 Sampling and sample preparation
6.1 The collection and preparation of laboratory samples shall be carried out in accordance with the agreed procedures or in accordance with relevant national standards.
6.2 Laboratory samples are generally granular, drill chips or milling chips, and no further processing is required.
6.3 If the laboratory sample is contaminated by grease during grinding or drilling, it should be cleaned with analytical pure acetone and dried in air.
6.4 If the laboratory sample has a large difference in particle size, the sample size should be obtained after reduction.
7 Analysis steps
Warning. The danger of this experiment is mainly the burning (burn) that easily occurs during the pre-firing and melting stages of the crucible. So it should be used from start to finish
Clamp the crucible and place the used crucible in a suitable container. The use of oxygen cylinders should comply with its usual safety measures. Local enrichment of oxygen can cause
Fire, so oxygen must be effectively discharged from the equipment during the combustion process.
7.1 The amount of sample
Weigh 1.0g sample to the nearest 0.0001g.
7.2 Blank test
According to the sample analysis method, add quantitative flux or accelerator. Carry out at least 3 blank tests.
7.3 Preparation of standard samples
The standard sample is made of steel standard sample and pure nickel with low sulfur content (with known sulfur content) in different proportions, so that the standard control range can reach
The upper limit of the sample to be analyzed. Table 1 shows the steel standard sample with a sulfur content (mass fraction) of 0.100% and the sulfur content (mass fraction) as
Example of calibration with 0.001% pure nickel.
Table 1 Calibration example
Steel mass number/g Nickel mass number/g Sulfur content in the component (mass fraction)/%
0.500
0.300
0.100
0.500
0.700
0.900
1,000
0.0050 + 0.0005
0.030 + 0.0007
0.0110 + 0.0009
0.0010
7.4 Preparation for analysis
7.4.1 Before calibrating and measuring samples, check and adjust the instrument to ensure that the instrument is in a normal and stable working state, and determine the best analysis
condition.
Get QUOTATION in 1-minute: Click GB/T 21931.2-2008
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GB/T 21931.2-2008: Nickel, ferronickel and nickel alloys -- Determination of sulfur content -- Infrared absorption method after induction furnace combustion
GB/T 21931.2-2008
Nickel, ferronickel and nickel alloys - Determination of sulfur content - Infrared absorption method after induction furnace combustion
ICS 77.100
H11
National Standards of People's Republic of China
GB/T 21931.2-2008/ISO 7526.1985
Determination of sulfur content in nickel, nickel-iron and nickel alloys
High frequency combustion infrared absorption method
(ISO 7526.1985, IDT)
2008-05-30 released
Implementation of.2008-12-01
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Issued by China National Standardization Administration
Preface
This part of GB/T 21931.2-2008 is equivalent to ISO 7526.1985 "Determination of high sulfur content in nickel, ferronickel and nickel alloys
Frequency combustion infrared absorption method.
The technical content of this part is exactly the same as that of ISO 7526.1985.For ease of use, this part has been modified as follows.
a) The term "this International Standard" is changed to "this Part";
b) Use a decimal point "." to replace the comma "," as a decimal point;
c) Delete the foreword of the international standard;
d) National standards are adopted for normative references;
e) The contents of the crucible cover in the international standard have been deleted.
Appendix A and Appendix B of this section are informative appendices.
This part was proposed by the China Iron and Steel Association.
This part is under the jurisdiction of the Metallurgical Industry Information Standards Institute.
Drafting organization of this section. Shanxi Taigang Stainless Steel Co., Ltd.
The main drafters of this section. Dai Xueqian, Liu Wei, Zhang Ruilin.
GB/T 21931.2-2008/ISO 7526.1985
Determination of sulfur content in nickel, nickel-iron and nickel alloys
High frequency combustion infrared absorption method
Warning. The personnel using this section should have practical experience in formal laboratory work. This section does not point out all possible security issues.
The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated by relevant national laws and regulations.
1 scope
This part of GB/T 21931 specifies the high-frequency induction furnace combustion infrared absorption method for the determination of sulfur content in nickel, nickel-iron and nickel alloys.
This part is applicable to the sulfur content of nickel and ferronickel from 0.001% to 0.3% (mass fraction) and the sulfur content of nickel alloy from 0.001% to 0.1%
(Mass score) determination. See Appendix A for examples of ingredient composition.
2 Normative references
The clauses in the following documents have become clauses of this part by reference to this part of GB/T 21931.All dated quotations
All subsequent amendments (excluding errata content) or revisions do not apply to this section, however, it is encouraged to reach
The parties to the agreement study whether the latest versions of these documents can be used. For undated references, the latest version is applicable to this
section.
GB/T 63779.1 Measurement methods and accuracy of results (accuracy and precision) Part 1.General principles and definitions
(GB/T 6379.1-2004, ISO 5725-1..1994, IDT)
GB/T 63779.2 Accuracy of measurement methods and results (accuracy and precision) Part 2.Determine the repeatability of standard measurement methods
The basic method of performance and reproducibility (GB/T 6379.2-2004, ISO 5725-2.1994, IDT)
3 Principle
The sample, flux and accelerator are placed in a high-frequency induction furnace and burned at high temperature under oxygen flow. The generated sulfur dioxide is carried by oxygen to
In the infrared absorption cell, the sulfur content in the sample can be measured by using the infrared detector and the integration program to measure the amount of sulfur dioxide generated after combustion.
4 Reagents and materials
4.1 Oxygen, the purity is greater than 99.5% (mass fraction).
4.2 Caustic soda asbestos (or soda lime), particle size 0.7mm ~ 1.2mm (14 mesh ~ 22 mesh).
4.3 Magnesium perchlorate, particle size 0.7mm~1.2mm (14 mesh ~ 22 mesh).
4.4 Glass wool.
4.5 Crucible.
4.5.1 The size of the ceramic crucible must be accurate, so that the sample can fit in the induction coil of the furnace (see 9.1).
4.5.2 In a furnace with air or oxygen, pre-fire the crucible at a temperature of 1100°C for more than 1 h, and then store it in a desiccator or airtight container
in. A resistance furnace in which oxygen passes through the combustion tube can be used.
4.6 Flux. low-sulfur tin, copper plus tin, copper or vanadium pentoxide (see 9.2).
4.7 Accelerator. copper, iron, tungsten or nickel with low sulfur content (see 9.2).
4.8 Nickel. Known content, sulfur content (mass fraction) is less than 0.001%.
4.9 Steel standard samples. sulfur content (mass fraction) 0.1% to 0.2%.
5 Instruments
High-frequency induction burners and infrared absorption sulfur analyzers can be purchased from many manufacturers. The operation of the instrument follows the manufacturer's instructions
GB/T 21931.2-2008/ISO 7526.1985
book. According to the technical specifications of the manufacturer, a pressure regulator is required to control the pressure of oxygen entering the furnace (usually 28kN/m2). Characteristics of commodity instruments
See Appendix B for sex.
6 Sampling and sample preparation
6.1 The collection and preparation of laboratory samples shall be carried out in accordance with the agreed procedures or in accordance with relevant national standards.
6.2 Laboratory samples are generally granular, drill chips or milling chips, and no further processing is required.
6.3 If the laboratory sample is contaminated by grease during grinding or drilling, it should be cleaned with analytical pure acetone and dried in air.
6.4 If the laboratory sample has a large difference in particle size, the sample size should be obtained after reduction.
7 Analysis steps
Warning. The danger of this experiment is mainly the burning (burn) that easily occurs during the pre-firing and melting stages of the crucible. So it should be used from start to finish
Clamp the crucible and place the used crucible in a suitable container. The use of oxygen cylinders should comply with its usual safety measures. Local enrichment of oxygen can cause
Fire, so oxygen must be effectively discharged from the equipment during the combustion process.
7.1 The amount of sample
Weigh 1.0g sample to the nearest 0.0001g.
7.2 Blank test
According to the sample analysis method, add quantitative flux or accelerator. Carry out at least 3 blank tests.
7.3 Preparation of standard samples
The standard sample is made of steel standard sample and pure nickel with low sulfur content (with known sulfur content) in different proportions, so that the standard control range can reach
The upper limit of the sample to be analyzed. Table 1 shows the steel standard sample with a sulfur content (mass fraction) of 0.100% and the sulfur content (mass fraction) as
Example of calibration with 0.001% pure nickel.
Table 1 Calibration example
Steel mass number/g Nickel mass number/g Sulfur content in the component (mass fraction)/%
0.500
0.300
0.100
0.500
0.700
0.900
1,000
0.0050 + 0.0005
0.030 + 0.0007
0.0110 + 0.0009
0.0010
7.4 Preparation for analysis
7.4.1 Before calibrating and measuring samples, check and adjust the instrument to ensure that the instrument is in a normal and stable working state, and determine the best analysis
condition.
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