Some standard content:
GB/T2903-1998
This standard is equivalent to the T-type thermocouple indexing table in IEC584-1:1995 "Thermocouple Part 1: Indexing Table" and the T-type thermocouple tolerance in IEC584-2:1989 (Thermocouple Part 2: Tolerance). This standard is a revision of GB/T2903-1989 "Copper-Copper Nickel (Constantan) Thermocouple Wire and Indexing Table". This standard has the following main differences from GB/T2903-1989 (hereinafter referred to as the original standard): 1 The original standard uses the IPTS-68 temperature scale, and this standard uses the ITS-90 temperature scale, so all thermoelectric calorific values have been revised.
2 The original standard contains the thermocouple indexing table. Since there is a national standard for the thermocouple indexing table, this standard no longer lists the thermocouple indexing table, but this standard lists the thermocouple indexing table. The thermoelectric potential value and tolerance of the couple at the main temperature points are to facilitate the inspection of the couple wire. 3 This standard is edited according to the requirements of GB/T1.1--1993 and GB/T1.22-1993. This standard will replace GB/T2903--1989 from the date of implementation. Appendix A of this standard is the standard appendix, and Appendix B of this standard is the reminder appendix. This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the Technical Committee for Standardization of Instrument Functional Materials of the Ministry of Machinery Industry. This standard was drafted by the Chongqing Instrument Material Research Institute of the Ministry of Machinery Industry, and Shanghai Alloy Co., Ltd., Sichuan Instrument Factory, Shenfu Alloy Co., Ltd., Wujin Electronic Alloy Material Factory, Tianjin Deta Technology Group Co., Ltd., Wuxun Yuandong Instrument Material Factory and other units participated in the drafting. tt||The main drafters of this standard are Zhang Zelin, Chen Lixin, Wang Youde, Zhu Bingyin, Xu Yonghong, Zhang Xiaohua and Chen Hongde. This standard was first issued in March 1982 and revised for the first time in March 1989. The Chongqing Instrument Material Research Institute of the Ministry of Machinery Industry is entrusted with the interpretation of this standard. g
National Standard of the People's Republic of China
Copper-Copper-Nickel (Constantan) Thermocouple Wires
Copper/Copper-Nickel (Constantan) thermocouple wires G/T2903-
Generation GB3/T29031989
This standard specifies the varieties, specifications, technical requirements, test methods, inspection rules, supply methods, packaging and markings of copper-copper-nickel thermocouple wires.
This standard is applicable to the manufacturing industry Alloy wire for copper-copper-nickel (constantan) thermocouple (T-type thermocouple) (hereinafter referred to as thermocouple wire). 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T16839.1—1997 Thermocouple Part 1: Graduation table GB/T16839.2--1997 Thermocouple Part 2: Tolerance GB/T16701.21996 Thermocouple material test method Part 2: Measurement method of thermoelectromotive force of cheap metal thermocouple wire JB/T6819.2—1993 Instrument material terminology temperature measurement material 3 Definitions
The terms defined in JIB/T6819.2 apply to this standard. 4
Product classification
4.1 Product name, code and nominal chemical composition are shown in Table 1. Table 1
Product name
Copper-nickel alloy wire
4.2 Even wire grade
Nominal chemical composition·%
Even wire is divided into Grade 1, Grade 2 and Grade 3 according to different use requirements and tolerances of thermoelectric properties. The classification conditions are specified by technical requirements. 4.3 Recommended upper temperature limit of even wire
The recommended upper temperature limit of even wire of various diameters is shown in Table 2. Table 2
Even wire diameter, mm
Approved by the State Administration of Quality and Technical Supervision on December 11, 1998 656
Upper limit of long-term use temperature, (
Upper limit of short-term use temperature, (
Implementation on July 1, 1999
Even wire diameter, mm
4.4 Marking example
Product marking shall be expressed in the following format:
GB/T 2903-1998
Table 2 (end)
Upper limit of long-term use temperature,
I -1.2-GB/T 2903—1998
4.5 For the physical parameters of the product, see Appendix B (suggestive Appendix). 5 Technical requirements
5.1 Surface quality
Upper limit of short-term use temperature, (
Standard year
Standard number
Product specification
Tolerance level (, I, II)
Product code (TP, TN)
The surface of the wire should be uniform in color, smooth, free of oil, folds, cracks, burrs and interlayers. Small scratches and depressions that do not exceed the diameter tolerance and individual dark spots are allowed. 5.2 Size and allowable deviation
The diameter and allowable deviation of the wire should comply with the provisions of Table 3. The roundness of the wire should not exceed the allowable deviation of the diameter, Table 3
Allowable deviation
Note: after supply and demand The two parties negotiate and allow the supply of other specifications of the wire. 5.3 Uneven thermoelectric potential
In the whole coil (reel) of the wire, the uneven thermoelectric potential should not exceed the provisions of Table 4. Table 4
5.4 Thermoelectric potential
Measuring end temperature. C
Uneven thermoelectric potential, uV
Copper-nickel alloy wire
5.4.1 For the thermocouple composed of the wire, when the reference end temperature is 0C, the relationship between its temperature and thermoelectric potential should comply with the T-type thermocouple graduation table in (B/T16839.1. Its tolerance should comply with the T-type thermocouple tolerance in GB3/T16839.2. The thermoelectric potential value and tolerance of the thermocouple at the main mixing point are shown in Table 5. The thermoelectric potential ratio of the thermocouple at the critical temperature point is shown in Appendix A (Standard Appendix) 1651
GB/T 2903-- 1998
5.4.2 For thermocouples composed of copper and platinum, pin and nickel, when the reference end temperature is 0°C, the relationship between the temperature and the thermoelectric potential shall comply with the provisions of the thermoelectric potential values and tolerances in Tables 6 and 7. The thermoelectric potential ratio and graduation table of copper-platinum and platinum-copper-nickel at the main graduation points are shown in Appendix A (Standard Appendix).
Table 5 Thermoelectric potential and tolerance of copper-copper-nickel thermocouple Measuring end temperature
Measuring end temperature
Thermoelectric potential
Nominal value
--5 539
Thermoelectric potential
Nominal value
—332
Thermoelectric potential
Nominal value
Thermoelectric potential range
4255~4303
6 674~6 734
9245--9331
11 957-~12 069
14 79214 932
17 744 ~17 892
Main 130
Thermoelectric potential range
4 232~4 326
6 648-~6 760
9 208--9 368
1190812118
[4732~1·1992
17 663~-17 973
Table 6 Copper-platinum thermocouple thermoelectric potential and tolerance T grade
Thermoelectric potential range
761-785
1 263-~1 287
1 825~1 849
2450-~2474
3137-3161
3 880~3 904
Thermoelectric potential range
758-~788
1 260～1 290
1822~1 852
1447～1477
3 134-2 164
3 877~~3 907
Table 7 Platinum-copper-nickel thermocouple thermoelectric potential and charge difference I level
Thermoelectric potential range
3 493~3517
5 412~-5 448
7 420-7 582
9 507-9 595
11 655~11 771
'13 864~13 988
Thermoelectric potential range
3 473-~ 3 537
5 389~5 471
7 386~7 516
9 461~9 641
11 598~11 828
13 786-~14 066
The Class II tolerance of unipolar thermoelectric potential is for reference only. The finished product leaving the factory shall be based on the Class II tolerance of the pairing in Table 5. 1
Thermoelectric emf range
5491587
2 720-- 2 79
Thermoelectric emf range
202~.· 222
325~- ---339
Thermoelectric emf range
- 2 396- 2 36
By agreement between the supplier and the supplier and with indication in the order contract, paired positive and negative poles are allowed to be supplied. The paired thermoelectric emf and tolerance shall comply with the provisions of Table 5. 2
5.5 Stability
When the thermocouples composed of various specifications of thermocouple wires are heated continuously in air at the temperature specified in Table 8 for 200h, the absolute value of the change in thermoelectric potential at the temperature 632 before and after heating shall not exceed the provisions of Table 8. Table 8
Diameter of thermocouple wire, mm
Test method
6.1 Surface quality
The surface quality shall be observed visually.
6.2 Dimension measurement
Test temperature, C
190±10
240±10
290—10
340--10
Thermoelectric potential change, μV
Equivalent to temperature value,
The diameter and roundness of the wire are measured in two perpendicular directions of the same cross section of the wire using a T-meter with an accuracy of not less than 0.01mm. At least 10 different parts of each coil (reel) of wire should be measured. 6.3 Uneven thermal electromotive force test
The ends of the samples taken from the two ends of the same coil (reel) of wire are welded to a Φ0.5mm platinum wire (R1/R of platinum wire ≥ 1.3920) as the measuring end, and placed in a hot couple calibration furnace, with the reference end placed at 0C, and kept at the test temperature specified in Table 4 for 2h. Measure its thermal electromotive force. The maximum difference in thermoelectric emf between the same-roll (disk) couple wire samples is the value of their uneven thermoelectric emf. 6.4 Thermoelectric emf measurement
Be carried out in accordance with the method specified in GB/T16701.2. The test temperature is as specified in Table 9Table 9
Diameter of couple wire, m
0.2, 0.3, 0.5
0. 2, 0. 3, 0. 5, 0.8
1. 0, 1. 2, 1. 6, 2. 0
6.5 Stability test
Test temperature,
200250
First, weld the positive and negative couple wires into a thermocouple and bundle them together with a second-class standard platinum 10-platinum thermocouple (the measuring end of the standard couple should be covered with a warm-smelting alumina tube with one end closed), and put them into the thermocouple calibration furnace. The depth of the sample inserted into the furnace shall not be less than 300mm. After the furnace temperature rises to the specified temperature, start measuring its thermoelectric potential and measure it every hour. When the thermoelectric potential value is stable within 60°C, take the thermoelectric potential as the first measurement value E. At the same time, record the time as the starting time of the stability test. Keep the temperature continuously and monitor the thermoelectric potential every few hours. The maximum difference between the thermoelectric potential values E and E. measured within 200 hours is E-E, which is the stability value. 7 Inspection rules
7.1 Inspection classification
Product inspection is divided into factory inspection and type inspection. 7.1.1 Factory inspection
Electrode wires shall be inspected by the quality inspection department of the manufacturer and be qualified with a product quality certificate before leaving the factory. Factory inspection items:
a) surface quality;
b) size;
c) uneven thermoelectric potential;
d) thermoelectric potential.
7.1.2 Type inspection
GB/T 2903—1998
All test items specified in this standard shall be carried out. Type inspection shall generally be carried out in any of the following circumstances: a) Trial and determination of new products or old products for production; b) After normal production, if there are major changes in raw materials or processes; c) During normal production, at least eleven inspections shall be carried out each year; d) When the product is resumed after a long period of suspension; e) When there is a significant difference between the results of the final inspection and the last type inspection; f) When the national quality supervision agency proposes a requirement for type inspection. 7.2 Sampling rules
7.2.1 Factory inspection shall be carried out from the head and tail of each roll (reel) of even wire produced. Take about 1.1m at each end for inspection, and the surface quality and size (7.1, 1 a) and b)) should be inspected for the entire roll (reel) of even wire. 7.2.2 Type inspection should randomly select at least 3 rolls (reels) of even wire for positive and negative poles from the finished product warehouse of the manufacturer, and take about 5.5m at the head and about 1.1m at the tail for inspection. The surface quality and size should be inspected for the entire roll (reel). 7.3 Judgment rules
7.3.1 During the factory inspection, as long as there are ~ items that are unqualified, the roll (reel) product is judged to be unqualified. 7.3.2 During the product type inspection, if there is only one item that fails, double sampling shall be carried out for full re-inspection. If there are still items that fail, the type inspection shall be judged to be unqualified.
8 Supply method, packaging and marking
8.1 Supply method
Even wire shall be supplied after annealing. The surface of even wire shall have a uniform oxide film. If the user requires, it is allowed to supply bright wire. 8.1.1
Each roll (reel) of even wire can only be wound with one wire material, and there shall be no joints, twists and knots. 8.1.2||tt ||8.1.3 The weight of each roll (reel) of even wire should not be less than the provisions of Table 10. Table 10
Even wire diameter, mm
1.0, 1.2, 1.6, 2.0
Note: For users who use even wire in large quantities, the weight of the roll can be agreed upon by both parties. 8.2 Packaging
Weight.kg
Except for Φ0.3mm and @0.5mm even wires that can be wound on the wire reel, even wires of other specifications can be wound into rolls, and each roll is tied at least twice, and each roll (reel) is packed with moisture-proof materials. 8.3 Marking
8.3.1 The marking of each roll (reel) of even wire shall include the following contents: a) Manufacturer’s name or trademark;
b) Product name and mark;
c) Product number:
d) Even wire size specification;
e) Gross weight and net weight of each roll (reel) of even wire;
g) Year, month and month of production.
8.3.2 The product certificate of each roll (reel) of even wire shall indicate: a) Manufacturer’s name or trademark;
b) Product name;
c) Product number;
d) Even wire size specification or mark;
e) This product complies with GB/T2903-1998;
f) Gross weight and net weight of each roll (reel);
g) Year, month and month of production.
GB/T2903-1998
GB/T2903-1998
Appendix A
(Appendix to the standard)
Thermoelectric potential ratio of copper-copper-nickel thermocouple wire and single-pole to platinum graduation Table A1 The thermoelectric potential ratio (Seebeck coefficient S) of copper-copper-nickel, copper-platinum and platinum-copper-nickel thermocouples at main temperature points is shown in Table A1. Table A1
Copper-copper-nickel
Copper (TP)-platinum (Pt-67) graduation table is shown in Table A2, Table A2
—195
S,μv/c
Copper-platinum
Copper (TP)-platinum (Pt-67) graduation table
Thermoelectric potential, μV
Thermoelectric potential·μV
The graduation table of copper (TP)-platinum (Pt-67) is calculated by the following polynomial: et
where the coefficients are
Platinum-copper-nickel
(reference end temperature is 0 ()
Temperature range
270℃～0℃
Cl5.8945482297
c 2. 1773546167×10 *2
cj2.8267617331X10 1
ct-2. 2561290632X10
Cs =9. 5020269020X10*?
co=2. 4127168233X108
C+3. 9107475678X10 10
Cs 4.2174034766X10-12
Cy 3. 0946718904 ×10-14
C =1- 5519300339X 10-16
Ch = 5. 2358609811x 10~ 19
C12 -1. 1363837913X10~ 21
T13 =1. 4330540792X10 24
Cl4 =7. 9795153927X10 25
GB/T 2903--1998
Platinum (Pt-67)-Copper Nickel (TN) Grading Table See Table A3. Table A3
0C~400℃
C:5.8945482265
C2 - 1. 5091347652X10
ts=1.3859883242x10 4
C --1. 8273511649× 10
rs=1. 0336356491 x10
t#=--3. 0658265534× 10
C4.6815308235×10 14
Cs--- 2. 9740716812X101*
C --1. 4745034313 × 10 2)
3. 6594053087X 1023
Platinum (Pt-67) - Copper Nickel (TN) Graduation Table
Thermoelectric potential, uv
Thermoelectric potential, uv
The graduation table of Platinum (Pt-67) - Copper Nickel (TN) is calculated by the following polynomial: F
Where the coefficients are
Temperature range
270℃～0℃
Cl 3. 2853558134X10
c2= 2. 2420888181X10 *2
Cz-—1.6423294226X10-4
c4=—2. 5283170780X10 6
Cs --4.8822494609X10-8
te=1.4760116404X10-9
C=--3. 0363214731X10-1
o℃～400℃
(reference end temperature is 0℃)
*-4762
-2 167
C = 3. 2833558138 X 10
cg-1. 8200880227X102
--2454
Gs=6. 7583601624 x105
G4-—3. 6087451975X10 7
Cs=6. 6052443623X10 10
G6= --1. 5749323771X10 13
G7— —1. 3361729442X101s
Temperature range
270 C～0C
: 3. 6800948830×10-13
tg -- -2. 7331969785 ×10 1
tlo--1.2677055605×1017
Gul=-3. 5899475217X10 20
Ctz=-5. 6829864280X10 23
13=3.8551373085×1026
GB/T 2903-- 1998
Appendix B
(Suggestive Appendix)
0℃400℃
Cx- 2. 2278151391× 10 18
Cy=--1.4745034313X0
C=3.6594053087X1035
Physical parameters of copper wire and copper-nickel alloy wire
The melting point, density, resistivity, average temperature coefficient of resistance, tensile strength and elongation of the wire are shown in Table B1. Table B1
Melting point,
Density at 20°C, g/cm
Resistivity at 20°C, μ2·cm
Average temperature coefficient of resistance in the range of 20°C to 100°C, ×101/°CTensile strength, MPa
Elongation (L=100 mm), %
≥196
Copper-nickel alloy wireμv/c
Copper-platinum
Copper (TP)-platinum (Pt-67) graduation table
Thermoelectric potential, μV
Thermoelectric potential·μV
The graduation table of copper (TP)-platinum (Pt-67) is calculated by the following polynomial: et
where the coefficients are
Platinum-copper-nickel
(reference end temperature is 0 ()
Temperature range
270℃～0℃
Cl5.8945482297
c 2. 1773546167×10 *2
cj2.8267617331X10 1
ct-2. 2561290632X10
Cs =9. 5020269020X10*?
co=2. 4127168233X108
C+3. 9107475678X10 10
Cs 4.2174034766X10-12
Cy 3. 0946718904 ×10-14
C =1- 5519300339X 10-16
Ch = 5. 2358609811x 10~ 19
C12 -1. 1363837913X10~ 21
T13 =1. 4330540792X10 24
Cl4 =7. 9795153927X10 25
GB/T 2903--1998
Platinum (Pt-67)-Copper Nickel (TN) Grading Table See Table A3. Table A3
0C~400℃
C:5.8945482265
C2 - 1. 5091347652X10
ts=1.3859883242x10 4
C --1. 8273511649× 10
rs=1. 0336356491 x10
t#=--3. 0658265534× 10
C4.6815308235×10 14
Cs--- 2. 9740716812X101*
C --1. 4745034313 × 10 2)
3. 6594053087X 1023
Platinum (Pt-67)-Copper Nickel (TN) Graduation Table
Thermoelectric potential, uv
Thermoelectric potential, uv
The graduation table of platinum (Pt-67)-Copper Nickel (TN) is calculated by the following polynomial: F
The coefficient is
Temperature range
270℃～0℃
Cl 3. 2853558134X10
c2= 2. 2420888181X10 *2
Cz-—1.6423294226X10-4
c4=—2. 5283170780X10 6
Cs --4.8822494609X10-8
te=1.4760116404X10-9
C=--3. 0363214731X10-1
o℃～400℃
(reference end temperature is 0℃)
*-4762
-2 167
C = 3. 2833558138 X 10
cg-1. 8200880227X102
--2454
Gs=6. 7583601624 x105
G4-—3. 6087451975X10 7
Cs=6. 6052443623X10 10
G6= --1. 5749323771X10 13
G7— —1. 3361729442X101s
Temperature range
270 C～0C
: 3. 6800948830×10-13
tg -- -2. 7331969785 ×10 1
tlo--1.2677055605×1017
Gul=-3. 5899475217X10 20
Ctz=-5. 6829864280X10 23
13=3.8551373085×1026
GB/T 2903-- 1998
Appendix B
(Suggestive Appendix)
0℃400℃
Cx- 2. 2278151391× 10 18
Cy=--1.4745034313X0
C=3.6594053087X1035
Physical parameters of copper wire and copper-nickel alloy wire
Electrode melting point, density, resistivity, average temperature coefficient of resistance, tensile strength and elongation are shown in Table B1. Table B1
Melting point,
Density at 20°C.g/cm
Resistivity at 20°C, μ2·cmbZxz.net
Average temperature coefficient of resistance in the range of 20°C to 100°C, ×101/°CTensile strength, MPa
Elongation (L=100 mm), %
≥196
Copper-nickel alloy wireμv/c
Copper-platinum
Copper (TP)-platinum (Pt-67) graduation table
Thermoelectric potential, μV
Thermoelectric potential·μV
The graduation table of copper (TP)-platinum (Pt-67) is calculated by the following polynomial: et
where the coefficients are
Platinum-copper-nickel
(reference end temperature is 0 ()
Temperature range
270℃～0℃
Cl5.8945482297
c 2. 1773546167×10 *2
cj2.8267617331X10 1
ct-2. 2561290632X10
Cs =9. 5020269020X10*?
co=2. 4127168233X108
C+3. 9107475678X10 10
Cs 4.2174034766X10-12
Cy 3. 0946718904 ×10-14
C =1- 5519300339X 10-16
Ch = 5. 2358609811x 10~ 19
C12 -1. 1363837913X10~ 21
T13 =1. 4330540792X10 24
Cl4 =7. 9795153927X10 25
GB/T 2903--1998
Platinum (Pt-67)-Copper Nickel (TN) Grading Table See Table A3. Table A3
0C~400℃
C:5.8945482265
C2 - 1. 5091347652X10
ts=1.3859883242x10 4
C --1. 8273511649× 10
rs=1. 0336356491 x10
t#=--3. 0658265534× 10
C4.6815308235×10 14
Cs--- 2. 9740716812X101*
C --1. 4745034313 × 10 2)
3. 6594053087X 1023
Platinum (Pt-67)-Copper Nickel (TN) Graduation Table
Thermoelectric potential, uv
Thermoelectric potential, uv
The graduation table of platinum (Pt-67)-Copper Nickel (TN) is calculated by the following polynomial: F
The coefficient is
Temperature range
270℃～0℃
Cl 3. 2853558134X10
c2= 2. 2420888181X10 *2
Cz-—1.6423294226X10-4
c4=—2. 5283170780X10 6
Cs --4.8822494609X10-8
te=1.4760116404X10-9
C=--3. 0363214731X10-1
o℃～400℃
(reference end temperature is 0℃)
*-4762
-2 167
C = 3. 2833558138 X 10
cg-1. 8200880227X102
--2454
Gs=6. 7583601624 x105
G4-—3. 6087451975X10 7
Cs=6. 6052443623X10 10
G6= --1. 5749323771X10 13
G7— —1. 3361729442X101s
Temperature range
270 C～0C
: 3. 6800948830×10-13
tg -- -2. 7331969785 ×10 1
tlo--1.2677055605×1017
Gul=-3. 5899475217X10 20
Ctz=-5. 6829864280X10 23
13=3.8551373085×1026
GB/T 2903-- 1998
Appendix B
(Suggestive Appendix)
0℃400℃
Cx- 2. 2278151391× 10 18
Cy=--1.4745034313X0
C=3.6594053087X1035
Physical parameters of copper wire and copper-nickel alloy wire
Electrode melting point, density, resistivity, average temperature coefficient of resistance, tensile strength and elongation are shown in Table B1. Table B1
Melting point,
Density at 20°C.g/cm
Resistivity at 20°C, μ2·cm
Average temperature coefficient of resistance in the range of 20°C to 100°C, ×101/°CTensile strength, MPa
Elongation (L=100 mm), %
≥196
Copper-nickel alloy wire5283170780X10 6
Cs --4.8822494609X10-8
te=1.4760116404X10-9
C=--3. 0363214731X10-1
o℃～400℃
(reference end temperature is 0℃)
*-4762
-2 167
C = 3. 2833558138 X 10
cg-1. 8200880227X102
--2454
Gs=6. 7583601624 x105
G4-—3. 6087451975X10 7
Cs=6. 6052443623X10 10
G6= --1. 5749323771X10 13
G7— —1. 3361729442X101s
Temperature range
270 C～0C
: 3. 6800948830×10-13
tg -- -2. 7331969785 ×10 1
tlo--1.2677055605×1017
Gul=-3. 5899475217X10 20
Ctz=-5. 6829864280X10 23
13=3.8551373085×1026
GB/T 2903-- 1998
Appendix B
(Suggestive Appendix)
0℃400℃
Cx- 2. 2278151391× 10 18
Cy=--1.4745034313X0
C=3.6594053087X1035
Physical parameters of copper wire and copper-nickel alloy wire
Electrode melting point, density, resistivity, average temperature coefficient of resistance, tensile strength and elongation are shown in Table B1. Table B1
Melting point,
Density at 20°C.g/cm
Resistivity at 20°C, μ2·cm
Average temperature coefficient of resistance in the range of 20°C to 100°C, ×101/°CTensile strength, MPa
Elongation (L=100 mm), %
≥196
Copper-nickel alloy wire5283170780X10 6
Cs --4.8822494609X10-8
te=1.4760116404X10-9
C=--3. 0363214731X10-1
o℃～400℃
(reference end temperature is 0℃)
*-4762
-2 167
C = 3. 2833558138 X 10
cg-1. 8200880227X102
--2454
Gs=6. 7583601624 x105
G4-—3. 6087451975X10 7
Cs=6. 6052443623X10 10
G6= --1. 5749323771X10 13
G7— —1. 3361729442X101s
Temperature range
270 C～0C
: 3. 6800948830×10-13
tg -- -2. 7331969785 ×10 1
tlo--1.2677055605×1017
Gul=-3. 5899475217X10 20
Ctz=-5. 6829864280X10 23
13=3.8551373085×1026
GB/T 2903-- 1998
Appendix B
(Suggestive Appendix)
0℃400℃
Cx- 2. 2278151391× 10 18
Cy=--1.4745034313X0
C=3.6594053087X1035
Physical parameters of copper wire and copper-nickel alloy wire
Electrode melting point, density, resistivity, average temperature coefficient of resistance, tensile strength and elongation are shown in Table B1. Table B1
Melting point,
Density at 20°C.g/cm
Resistivity at 20°C, μ2·cm
Average temperature coefficient of resistance in the range of 20°C to 100°C, ×101/°CTensile strength, MPa
Elongation (L=100 mm), %
≥196
Copper-nickel alloy wire
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