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GB/T 39974-2021: Magnesium partially stabilized zirconia ceramic element for oxygen measurement in molten steel
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 39974-2021 | English | 119 |
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Magnesium partially stabilized zirconia ceramic element for oxygen measurement in molten steel
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GB/T 39974-2021
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Basic data | Standard ID | GB/T 39974-2021 (GB/T39974-2021) | | Description (Translated English) | Magnesium partially stabilized zirconia ceramic element for oxygen measurement in molten steel | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q32 | | Word Count Estimation | 6,628 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39974-2021: Magnesium partially stabilized zirconia ceramic element for oxygen measurement in molten steel
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Magnesium stabilized zirconia ceramic element for measuring oxygen in molten steel)
ICS 81.060.30
Q32
National Standards of People's Republic of China
Magnesium stabilized zirconia ceramic element for measuring oxygen in molten steel
Released on 2021-05-21
2021-12-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Building Materials Federation.
This standard is under the jurisdiction of the National Industrial Ceramics Standardization Technical Committee (SAC/TC194).
Drafting organizations of this standard. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Foshan Standardization Association, Shandong Guoci Functional Materials Co., Ltd.
The company, Shanghai University of Applied Sciences, Loudi Antiyas Electronic Ceramics Co., Ltd., National Electronic Ceramic Product Quality Supervision and Inspection Center (Hu
South), Dongguan Changsheng Machinery Processing Co., Ltd., Shanghai Jingkaide Precision Ceramics Co., Ltd., Shandong Industrial Ceramics Research and Design Institute Co., Ltd.
the company.
The main drafters of this standard. Nian Hongqiang, Xia Jinfeng, Zhou Guohong, Xue Zhenhai, Yang Liuhui, Rao Xiumei, Yang Aimin, Si Liuqi, Zhang Cheng,
Kang Dinghua, He Hengping, Zheng Haisheng, Guo Haigen, Shan Zhekai, Chen Changzhu.
Magnesium stabilized zirconia ceramic element for measuring oxygen in molten steel
1 Scope
This standard specifies the technical requirements, test methods, inspection rules,
Marking, packaging, storage and custody, etc.
This standard is applicable to magnesium-stabilized zirconia ceramic components for measuring oxygen in molten steel.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 2828.1 Sampling inspection procedure by attributes Part 1.Batch inspection sampling plan retrieved by acceptance quality (AQL)
GB/T 5594.5 Electronic component structural ceramic material performance test method Volume resistivity test method
GB/T 25995 Test method for density and apparent porosity of fine ceramics
HG/T 2573 Industrial Light Magnesium Oxide
QC/T 413-2002 Basic technical conditions for automotive electrical equipment
YS/T 568.1-2008 Methods for chemical analysis of zirconium oxide and hafnium oxide-Determination of the combined content of zirconium oxide and hafnium oxide
Measuring method
YS/T 568.2-2008 Methods for chemical analysis of zirconium oxide and hafnium oxide-Determination of iron content-Sulfosalicylic acid spectrophotometric method
YS/T 568.5-2008 Methods for chemical analysis of zirconium oxide and hafnium oxide. Determination of sodium content. Flame atomic absorption spectrometry
3 Technical requirements
3.1 General requirements
The components shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures, and shall meet the requirements of this standard.
3.2 Operating temperature range
The operating temperature range of the component. 1500℃~1750℃.
3.3 Appearance quality and dimensional accuracy
The appearance of the component is not allowed to have visible cracks; the size of the crack is less than 0.5mm, and each product cannot have more than two cracks.
The inner diameter, outer diameter, height, roundness and straightness of the components are in accordance with the requirements of the customer's drawings.
3.4 Component physical and chemical properties
The physical and chemical performance requirements of component materials are shown in Table 1.
3.5 Thermal shock resistance
After the component was subjected to five air-cooled thermal shock cycles from 1000℃ (heat preservation 20min) to room temperature, there was no crack on the surface of the component visually.
4 Test method
4.1 General test conditions
According to the provisions of 4.1 in QC/T 413-2002.
4.2 Appearance quality and dimensional accuracy
The appearance quality of the components is inspected by visual inspection. Use accurate measuring tools to directly measure the dimensional accuracy and form tolerance of the product.
4.3 Element content
4.3.1 Determination of (ZrO2 HfO2 MgO) content
Determine the content of (ZrO2 HfO2) in accordance with YS/T 568.1-2008, and determine the content of MgO in accordance with HG/T 2573, and finally
Add the two to determine the content of (ZrO2 HfO2 MgO).
4.3.2 Determination of Fe2O3 content
Determined according to YS/T 568.2-2008 regulations.
4.3.3 Determination of Na2O content
Determined according to YS/T 568.5-2008 regulations.
4.4 Determination of bulk density and apparent porosity
Using the same raw materials as the actual production products, the same molding and sintering process are used to prepare furnace samples, which are measured in accordance with GB/T 25995.
4.5 Conductivity
The samples are prepared using the same raw materials as the actual products, the same molding and sintering process, and the platinum slurry is used to prepare the electrodes during the test.
GB/T 5594.5 stipulates determination.
4.6 Thermal shock resistance
The element was subjected to 10 air-cooled thermal shock cycles from 1000°C (heat preservation 20min) to room temperature. After repeated 5 times, the surface of the sample was visually inspected.
crack.
5 Inspection rules
5.1 Factory inspection
The factory inspection items are appearance quality, dimensional accuracy, density, apparent porosity and electrical conductivity.
5.2 Type inspection
All items specified in Chapter 3 are type inspection items. Type inspection will be carried out when one of the following situations occurs.
a) Trial type inspection of new products or old products produced in different places.
b) After the formal production, if the structure, material, and process have major changes that may affect the performance of the product.
c) When the product has been stopped for more than 1 year and resumed production.
d) When there is a big difference between the factory inspection result and the last type inspection result.
e) When the national quality supervision agency requests for type inspection.
5.3 Sampling rules
5.3.1 Batch
A batch of products should be a group of product structures that are continuously produced by the same batch of raw materials on the same production line through the same process and submitted for acceptance at the same time.
If.200 pieces are used as a batch, it can still be used as a batch if there are less than.200 pieces.
5.3.2 Sampling
Each batch of components shall be checked and accepted according to the provisions of GB/T 2828.1.This standard recommends the use of.
---General inspection level. Ⅱ;
---Reception quality limit. AQL0.40-AQL4.0;
---Sampling plan. a normal inspection sampling plan.
5.4 Judgment rules
When all inspection items meet the requirements specified in this standard, the batch of products is determined to be qualified. If there is an unqualified item, it should be from the same batch of products
Double the number of products will be selected for re-inspection of unqualified items. When the re-inspection is qualified, the batch of products is still judged as qualified; if the re-inspection is still unqualified, then
Determine that the batch of products is unqualified.
6 Marking, packaging, storage and custody
The marking, packaging, storage and custody of the product shall comply with the requirements of Chapter 6 of QC/T 413-2002.
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