GB/T 4702.17-2016 in English
VALIDChromium metal―Determination of oxygen, nitrogen and hydrogen content―Inert gas fusion thermal infrared detection method and conductivity method
- Issued on:2016-12-13
- Implemented on:2017-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 4702.17-2016金属铬 氧、氮、氢含量的测定 惰性气体熔融红外吸收法和热导法》由TC318（全国生铁及铁合金标准化技术委员会）归口，主管部门为中国钢铁工业协会。
Introduction
Determination of oxygen, nitrogen and hydrogen contents in metallic chromium
| Standard name | Scope of application | Determination indicators |
|---|---|---|
| GB/T4702.17-2016 | Determination of oxygen, nitrogen and hydrogen contents in metallic chromium | The mass fraction ranges of oxygen, nitrogen and hydrogen are: 0.010%~0.800%, 0.001%~0.070%, 0.001%~0.050% respectively |
| Infrared absorption method | Determination of oxygen content | Compare with the electrical signal of the standard substance to generate CO₂ and H₂O signals |
| Thermal conductivity method | Determination of nitrogen content | Analyze the electrical signal output by the thermal conductivity detector |
Standard background and technical evolution
GB/T4702 series standards are industry standards proposed and managed by the China Iron and Steel Association, which are used to guide the chemical analysis of metal chromium and its alloys. This part (Part 12) mainly focuses on the determination of oxygen, nitrogen and hydrogen content, and adopts advanced inert gas melting infrared absorption method and thermal conductivity method.
Technical principle
The sample and flux (nickel) are heated and melted in a graphite crucible in a pulse electrode furnace to release oxygen, nitrogen and hydrogen. Oxygen combines with carbon to generate carbon monoxide or carbon dioxide, which is converted into carbon dioxide after rare earth copper oxide and loaded into infrared detector for analysis; hydrogen generates water vapor, which outputs signals through water infrared detector; the remaining nitrogen is measured by thermal conductivity detector.
Instrument requirements
- Oxygen, nitrogen and hydrogen analyzer: including measurement unit, detection unit, purification device and control system.
- Analytical balance: maximum weighing is 110g, accurate to 0.0001g.
- Graphite crucible and nickel basket: need to be pickled and dried for use.
Implementation suggestions
1. The laboratory should be equipped with professional personnel to ensure that the operation complies with safety regulations.
2. Use grade 3 or above pure water that complies with GB/T6682.
3. Calibrate the instrument regularly, using single standard point or multi-point calibration procedures to ensure the accuracy of the analysis results.
4. A blank test must be performed for each analysis, and ensure that the sample passes through the 1.68mm sieve evenly.
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