GB/T 24583.2-2019 PDF EnglishUS$150.00 · In stock · Download in 9 seconds
GB/T 24583.2-2019: Vanadium-nitrogen - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 24583.2: Historical versions
Similar standardsGB/T 24583.2-2019: Vanadium-nitrogen - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT24583.2-2019 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.100 H 11 Replacing GB/T 24583.2-2009 Vanadium-nitrogen - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas ISSUED ON: JUNE 04, 2019 IMPLEMENTED ON: MAY 01, 2020 Issued by: State Administration for Market Regulation; Standardization Administration of the PRC. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Principles ... 6 4 Reagents and materials ... 6 5 Instruments and equipment ... 6 6 Sampling and sample preparation ... 8 7 Analytical procedures ... 8 8 Expression of analysis results ... 9 9 Precision ... 10 10 Test report ... 10 Appendix A (Normative) Flow chart for acceptance procedure of sample analysis value ... 11 Appendix B (Informative) Raw data of joint precision test ... 12ForewordGB/T 24583 Vanadium-nitrogen alloy analysis method is divided into 8 parts: - GB/T 24583.1 Vanadium-nitrogen - Determination of vanadium content - Ammonium ferrous sulfate titration method; - GB/T 24583.2 Vanadium-nitrogen - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas; - GB/T 24583.3 Vanadium-nitrogen - Determination of nitrogen content - Distillation-neutralization titration method; - GB/T 24583.4 Vanadium-nitrogen - Determination of carbon content - Infrared absorption method; - GB/T 24583.5 Vanadium-nitrogen - Determination of phosphorus content - Bismuth molybdenum blue spectrophotometric method; - GB/T 24583.6 Vanadium-Nitrogen alloy - Determination of sulfur content - The infrared absorption method; - GB/T 24583.7 Vanadium-nitrogen - Determination of oxygen content - Infrared absorption method; - GB/T 24583.8 Vanadium-nitrogen - Determination of silicon, manganese, phosphorus, aluminum content - Inductively coupled plasma atomic emission spectrometric method. This Part is Part 2 of GB/T 24583. This Part is drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 24583.2-2009 “Vanadium-Nitrogen alloy - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas”. Compared with GB/T 24583.2-2009, the main technical changes in this Part are as follows: - CHANGE the measuring range (mass fraction) to “8.00%~20.00%” (see Clause 1; Clause 1 of the 2009 edition); - Modify “Normative references” (see Clause 2; Clause 2 of the 2009 edition); - CHANGE the graphite crucible from high-temperature graphite crucible to suitable-for-instrument high-purity graphite crucible (see 4.12; 4.9 of the 2009 edition); Vanadium-nitrogen - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas Caution - The personnel using this Part shall have hands-on experience in formal laboratory work. This Part does not address all possible safety problems. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions set by the relevant national regulations.1 ScopeThis Part of GB/T 24583 specifies the determination of nitrogen content in vanadium-nitrogen alloy by thermal conductimetric method after fusion in a current of inert gas. This Part applies to the determination of nitrogen content in vanadium-nitrogen alloy. Measuring range (mass fraction): 8.00%~20.00%.2 Normative referencesThe following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document. GB/T 6379.1 Accuracy (trueness and precision) of measurement methods and 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 8170 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 20567 Vanadium-nitrogen 5.2.1 The carrier gas system includes a helium container, a two-stage pressure regulator, and a sequential control part which ensures proper pressure and rated flow. 5.2.2 The power gas source includes power gas (nitrogen or compressed air), a two-stage pressure regulator, and a sequential control part which ensures proper pressure and rated flow. 5.3 High-temperature electrode furnace It shall meet the requirements for the fusion temperature of the test portion. 5.4 Control system Control functions include crucible loading-unloading, coil base lift, dust collector cleaning, analysis condition selection settings, analysis process monitoring and alarm interruption, analysis data acquisition, calculation, correction, and processing, etc. 5.5 Measurement system It is mainly composed of an electronic balance (sensitivity is 0.1 mg) controlled by a microprocessor, a thermal conductivity cell detector, and an electronic measuring element.6 Sampling and sample preparationIn accordance with the provisions of GB/T 20567, the sample shall be taken and prepared. The sample shall all pass through the 0.125 mm sieve pore.7 Analytical procedures7.1 Number of determinations The same sample is determined at least twice independently. 7.2 Test portion WEIGH 0.05 g of sample, accurate to 0.0001 g. 7.3 Analysis preparation 7.3.1 According to the instruction manual of the instrument, debug and check the instrument (mainly air-tightness check), to keep the instrument in a normal stable state. 7.3.2 Choose to set the best analysis conditions. 7.3.3 USE the sample and flux to perform two test trials according to 7.6, to determine if the instrument is normal. 7.4 Blank test At least 3 blank tests are performed along with the test portion. The nitrogen blank value shall be less than 2 μg. Calculate the average. Refer to the instrument manual. INPUT the average as a blank to the azotometer. The instrument, when measuring the test portion, will automatically perform the electronic compensation of the blank value. 7.5 Calibration test According to the nitrogen content of the sample to be tested, establish a corresponding analysis curve; choose at least 2 standard samples (The nitrogen content range of standard sample shall cover the nitrogen content of the sample to be tested). The calibration and check shall be carried out in turn. The fluctuation of the determination result shall be within the range of reproducibility limit, to confirm the linearity of the system. Otherwise, the linearity of the system shall be adjusted according to the instrument manual. 7.6 Determination 7.6.1 According to the type of graphite crucible used in the azotometer, one of the following combinations is selected as a flux: a) Tin capsule (see 4.6)+nickel capsule (see 4.7); b) Tin capsule (see 4.6)+nickel basket (see 4.8); c) Nickel capsule (see 4.7)+0.20 g of tin granule (see 4.5). 7.6.2 LOAD the test portion (see 7.2) into the selected tin capsule (see 4.6) or nickel capsule (see 4.7); ADD another flux selected in 7.6.1; carefully SQUEEZE and wrap; PLACE in the instrument’s feeding device. PLACE the graphite crucible (see 4.12) on the crucible holder; operate according to the instrument manual; determine and read the result.8 Expression of analysis resultsIf the absolute value of the difference between two independent analysis results of the same sample is not greater than the repeatability limit r, the arithmetic mean is taken as the analysis result. If the absolute value of the difference between the two independent analysis results is greater than the repeatability ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 24583.2-2019 be delivered?Answer: The full copy PDF of English version of GB/T 24583.2-2019 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 24583.2-2019_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 24583.2-2019_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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