This standard specifies the technical requirements for thermocouple wires of tungsten-rhenium 3-tungsten-rhenium 25 and tungsten-rhenium 5-tungsten-rhenium 26 with a service temperature range of 0°C to 2300°C. JB/T 9497-2002 Tungsten-rhenium thermocouple wire and graduation table JB/T9497-2002 Standard download decompression password: www.bzxz.net

ICS17.220:31.030
Open with JIUSHEN reader
Standard of the machinery industry of the People's Republic of China
JB/T 9497--2002
Replaces JB/T9497—1999
Tungsten-rhenium thermocouple wires and temperature-electromotiveforce(EMF)tables(ASTM E696-95, standard specification for Tungsten-rhenium alloy thermocouple wire, NEQ) 2002-07-16 Issued
2002-12-01 Implementation
Issued by the State Economic and Trade Commission of the People's Republic of China Foreword.
2 Normative references
3 Product varieties, specifications and basic parameters
3.1 Name, code and nominal chemical composition of coupled wires 3.2 Diameter and allowable deviation of coupled wires
3.3 Graduation number and designation
4 Technical requirements.
Surface quality
4.3 Thermoelectric potential and allowable deviation
4.4 Uneven thermoelectric potential
Windability
4.6 Other properties,
5 Test methods
5.1 Sampling
Sample preparation
Test instruments and equipment
5.4 Dimension measurement..…
Surface quality inspection
Thermoelectric characteristics test
Uneven thermoelectric potential test
5.8 Windability test
6 Inspection rules.
Factory inspection.
Type test,
7 Supply method, packaging and labeling.
Supply method
Packaging,
7.3 Labeling.
Appendix A (Informative Appendix) Reference function and related parameters of thermoelectric potential of tungsten thermocoupleTable 1 Name, code and nominal chemical composition of the couple wire.…Table 2 Diameter and allowable deviation of the couple wire
Table 3 Thermocouple graduation number,
Table 4 WRe3-WRe25 thermocouple graduation table
Table 5 WRe5-WRe26 thermocouple graduation table
Table 6 Allowable deviation of thermoelectric potential,
JB/T9497--2002
JB/T9497— 2002
Table A.1WRe3-WRe25Thermocouple Thermoelectric Force Reference Function CoefficientsTable A.2WRe5-WRe26Thermocouple Thermoelectric Force Reference Function Coefficients..Table A.3Thermocouple Thermoelectric Force Ratio (Seebeck Coefficient S)Table A.4Density of Wire and Room Temperature Resistivity
Table A.5Tensile Strength and Relative Elongation,
JB/T9497-2002
Compared with ASTME696-95 "Tungsten Alloy Thermocouple Wire Standard Technical Specification", this standard is basically the same in technical content, but has great differences in writing format, test methods, inspection rules, etc. This standard replaces JB/T9497-1999 "Tungsten Thermocouple Wire and Graduation Table". Compared with JB/T9497--1999, in addition to the revisions in editing and text, the main differences between this standard and JB/T9497--1999 are as follows: - This standard changes the temperature range of 300℃～1200℃ in the thermoelectric characteristics test to 300℃～1500℃, and the content of its articles and corresponding articles are modified accordingly:
- This standard adopts the scale table corrected according to the ITS-90 temperature scale, which is completely the same as ASTME696-95; This standard revised the allowable deviation of the wire diameter from the original standard of ±0.02mm and ±0.03mm to ±0.01mm, which is consistent with ASTME696-95.
Appendix A of this standard is an informative appendix
This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the Standardization Technical Committee of Functional Materials for Instruments in the Machinery Industry. The responsible drafting unit of this standard: Chongqing Instrument Materials Research Institute. The main drafters of this standard: Wu Chengshan and Liu Yinglong. The previous versions of the standards replaced by this standard are: ZBN05003-88, JB/T9497—1999. m
1 Scope
Tungsten thermocouple wire and graduation table
JB/T9497-—2002
This standard specifies the technical requirements for thermocouple wires (hereinafter referred to as thermocouple wires) for tungsten 3-tungsten 25 and tungsten 5-tungsten 26 thermocouples with a service temperature range of 0℃～2300℃.
2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. JB/T6820-1993 Thermocouple material test method Refractory metal thermocouple wire thermoelectric electromotive force test method (egVASTME452-83)
3 Product variety specifications and basic parameters
3.1 Name, code and nominal chemical composition of the thermocouple wire The name, code and nominal chemical composition of the thermocouple wire are shown in Table 1. Table 1 Name, code and nominal chemical composition of even wire Name of even wire
Tungsten 3 alloy
Tungsten 25 alloy
Tungsten 5 alloy
Tungsten 26 alloy
Diameter and allowable deviation of even wire
The diameter and allowable deviation of even wire shall comply with the provisions of Table 2. The roundness deviation of even wire shall not exceed the allowable deviation of diameter. Code
Table 2 Diameter and allowable deviation of even wire
Diameter of even wire
Allowable deviation
Nominal chemical composition
Unit: mm
Note: With the agreement of both parties, even wires of other specifications with diameters between 0.1mm and 0.5mm are allowed to be supplied, but the allowable deviation remains unchanged. 3.3 Graduation and label
3.3.1 Graduation
The graduation of thermocouples composed of tungsten 3 alloy paired with tungsten 25 alloy, tungsten 5 alloy paired with tungsten 26 alloy is shown in Table 3. JB/T9497—2002
3.3.2 Wire label
Thermocouple type
Tungsten 3-Tungsten 25
Tungsten 5-Tungsten 26
The wire label should be expressed in the following format: For example:
Table 3 Thermocouple Graduation
WRe3—0.5
4 Technical requirements
4.1 Surface quality||tt| |Graduation number
WRe3-WRe25
WRe5-WRe26
JB/T9497—XXXX
Year of standard
Standard number
Diameter of thermocouple
Code of thermocouple
The surface of thermocouple shall be smooth, without oxidation color, folding, burr, interlayer and splitting. Small scratches, depressions and individual spots are allowed. 4.2 Size
The diameter specification and allowable deviation of thermocouple are shown in Table 2. 4.3
Thermoelectric potential and allowable deviation
When the reference end temperature is 0℃, the graduation tables of thermocouples composed of thermocouples of tungsten 3-tungsten 25 and tungsten 5-tungsten 26 are shown in Table 4 and Table 5 respectively, and the allowable deviation shall comply with the provisions of Table 6. 4.4 Uneven thermal electromotive force
The uneven thermal electromotive force of the positive or negative pole of the whole roll (reel) of the even wire shall not exceed 80μA at 1200℃. 5 Winding range
The ambient temperature is 20℃～30℃. After the even wire is wound 5 times around a cylinder with a diameter of 5 times, there shall be no cracks on its surface and the even wire shall not break. 4.6 Other properties
For other properties of even wire, please refer to Appendix A.
5 Test method
5.1 Sampling
5.1.1 The factory test shall be conducted by sampling about 1.2m from the head and tail of each roll (reel) of even wire produced, or sampling shall be conducted according to the test requirements. 5.1.2 Type test Randomly select at least three rolls (reels) of even wire from the finished products, and sample 1.2m from the head and tail of each roll (reel). Sample 6m from any end of one roll (reel) to conduct head and tail unevenness test and continuous unevenness test within 6m. 5.2 Sample preparation
Except for dimensional inspection, the samples should be processed according to the following procedures. 5.2.1 Cleaning
Clean the sample with 20% (weight percentage) sodium hydroxide solution, then wash the alkali solution with distilled water, wipe the surface with alcohol, and dry. 5.2.2 Welding
Use argon arc welding to weld the hot electrode into the measuring end. The welding point should be spherical and free of oxidation, scratches and depressions. Note: The measuring end can also be formed by twisting. The number of twisting circles should be no less than 5 circles and the length should not exceed 7 times the wire diameter. 2
4WRe3-WRe25 thermocouple graduation table
JB/T9497-2002
Unit: mv
JB/T9497--2002
Table 4 (continued)
Unit: mv
Table 4 (continued)bzxZ.net
JB/T9497—2002
Unit: mv
JB/T9497--2002
Table 4 (continued)
Unit: mv
Table 4 (continued)
JB/T9497-—2002
Unit: mv
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