This standard specifies the technical requirements, test methods, inspection rules, etc. for bare wires of high resistance electric heating alloy wires (less than Φ0.20mm). JB/T 7117-1993 Technical requirements for high resistance electric heating alloy wires (φ＜0.20mm) JB/T7117-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7117-1993
Technical conditions for high resistance electric heating alloy wire
(g<0.20mm)
Published on October 8, 1993
Ministry of Machinery Industry of the People's Republic of China
Implemented on January 1, 1994
Mechanical Industry Standard of the People's Republic of China
Technical conditions for high resistance electric heating alloy wire
(<0 .20mm）
Subject content and scope of application
JB/T7117-1993
This standard specifies the technical requirements, test methods, inspection rules, etc. for bare wires of high-resistance electric heating alloy wires (less than 0.20mm). This standard is applicable to nickel-chrome (Cr20Ni80) and nickel-chromium-iron (Cr15Ni60) electric heating resistance alloy (hereinafter referred to as alloy) wires with a nominal diameter of less than 0.20mm for making electric heating elements and resistance elements. 2
Cited standards
GB1234
GB223.1~223.7
GB6146
GBn112
Technical requirements
Chemical composition
High resistance electric heating alloy
Chemical analysis method for steel and alloys
Resistivity test method for precision resistance alloys
Metal tensile test method
Wire repeated bending test method
Precision alloy General provisions for packaging, marking and quality certification The alloy grade and chemical composition shall conform to the provisions of Table 1 Table
Alloy grade
Cr15Ni60
Cr20Ni80
Note: ?
0.75~1.60
15.0~18.0
20.0~23.0
Under the condition that the physical properties and process properties of the alloy wire meet the requirements of this standard, it is allowed to add appropriate trace elements to improve the properties of general alloys. The nominal diameter of the alloy wire shall comply with the provisions of Table 2. Table
Alloy grade
Cr15Ni60
Cr20Ni80
0.1000.110
Note: The values ​​in brackets are non-priority numbers
Approved by the Ministry of Machinery Industry on October 8, 1993
55.0~61.0
The chemical composition is allowed to have a slight deviation from the provisions of Table 1, mm
Implementation on January 1, 1994
JB/T7117-1993
The allowable deviation of the nominal diameter of the alloy wire is only a reference value according to Table 3. It can also be supplied with the allowable deviation of the nominal diameter specified by the test resistance value or other regulations agreed upon by both parties.
0.020<≤0.035
0.035<0.070
0.070<≤0.100
0.100<≤0.190
The roundness of the alloy wire should not exceed half of the corresponding nominal diameter tolerance. 3
3.4 ​​Net weight
The net weight of each shaft of alloy wire should comply with the provisions of Table 4. It is allowed to supply alloy wire with a shaft weight not less than 50% of that specified in Table 4, but each batch shall not exceed 15% (by net weight)
Nominal diameter
0.020<≤0.025
0.025<@≤0.040
0.040<≤0.060
0.060<≤0.100
0.100≤0.120
0.120<≤0.150
0.150≤0.190
Physical properties
Net weight per shaft
Not less than
The resistivity of soft alloy wire at 20C shall comply with the provisions of Table 5. Table
Alloy grade
Cr15Ni60
Cr20Ni80www.bzxz.net
The nominal resistance per meter of soft alloy wire is as specified in Table 6. Table
Nominal diameter
Nominal resistance per meter
Cr15Ni60
Cr20Ni80
Nominal diameter
Allowable deviation
Nominal resistance per meter a/m
Cr15Ni60
Cr20Ni80
Nominal diameter
Nominal resistance per meter
Cr15Ni60
JB/T7117-1993
Continued Table 6
Cr20Ni80
283:23
Nominal diameter
The allowable deviation of the nominal resistance per meter of soft alloy wire shall comply with the provisions of Table 7. Table
Nominal diameter
0.020<≤0.035
0.35<0.070
0.070<8≤0.10
0.10 and 0.190
Also available are alloy wires with smaller tolerances for resistance per meter. According to the agreement between the supply and demand parties, the resistance per meter change between any two sections in each axis of cold-drawn wire shall not exceed 4%. Process performance
The elongation of soft alloy wire shall not be less than that specified in Table 8. Table
0.020<0.050
0.050<@≤0.090
0.090<0≤0.130
0.130<@0.190
Nominal resistance per meter 0/m
Cr15Ni60
Allowable deviation of resistance per meter
Elongation S(l100mm）%
Cr15Ni60
The breaking force of soft alloy wire shall not be less than that specified in Table 9. Table
Nominal diameter
Breaking force
Cr15Ni60
Cr20Ni80
Nominal diameter
Not less than
Cr20Ni80
Cr20Ni80
Breaking force
Cr15Ni60
Cr20Ni80
Nominal diameter
Surface quality
Breaking force
Cr15N i60
JB/T7117-1993
Continued Table 9
Nominal diameter
Cr20Ni80
Break strength
Cr15Ni60
Cr20Ni80
No cracks,
The surface of the alloy wire should be smooth,
Defects that affect the performance such as kinks and twists exist,
but slight
hair and bamboo knots are allowed.
Delivery status
The alloy wire is supplied in soft state, t
supply hard alloy wire.
According to the agreement between the supply and demand parties,
Fast life
Alloy wire can be subjected to a fast life test at a specified temperature, and its life value should not be lower than that specified in Table 10. Wire used as resistors may not be subjected to a fast life test.
Alloy grade
Cr15Ni60
Cr20Ni80
Test method
The test methods for the relevant inspection items of alloy wire shall be in accordance with the provisions of Table 11. Table
Inspection items
Chemical composition
Net weight
Physical properties
Resistance uniformity
Mechanical properties
Surface quality
Fast life
Inspection rules
Inspection and acceptance
Technical requirements Article number
3.5.1~3.5.3
Acid test standard or method
GB 223.1~223.7
Use a measuring tool that can ensure the dimensional measurement accuracy of 0.001mm and weigh with an accuracy of 0.1g
GB6146
GB6146
GB1234 Appendix A
Fast life value
Number of samples
Number of axes 3%
Axis per furnace
The inspection and acceptance of alloy wires shall be carried out by the supplier's technical supervision department. The purchaser has the right to inspect the products according to the provisions of this standard. Batch rules
Each batch consists of alloy wires of the same brand, the same smelting furnace number, the same specification and the same heat treatment state submitted for inspection and acceptance in batches,
alloy wires.
5.3 Sampling quantity
JB/T7117-1993
The sampling quantity of the alloy wire net quality inspection items shall comply with the provisions of Table 11. The sampling quantity of the proportional sampling items shall not be less than 3 reels. Re-inspection and judgment rules
When one of the technical indicators of the alloy wire test results is unqualified, double the products should be taken from the uninspected products for re-inspection. If the re-inspection results are still unqualified, the batch will not be accepted, but the supplier can deliver the qualified reels one by one. 6 Packaging, marking, transportation, storage and quality certificate 6.1 Packaging
6.1.1 The alloy wire should be tightly and evenly wound on the reel and supplied in reels. The order is not disordered. Each reel consists of 100 alloy wires, and the end should be clearly marked.
6.1.2 After each reel is wrapped with packaging paper, it is placed in a moisture-proof and dust-proof container and packaging. The product quality certificate and packing list should be placed in the box. Marking
Each shaft of alloy wire shall be labeled, and the label shall indicate: a.
Manufacturer (institute) name or trademark;
Alloy brand, standard number;
Specification;
Supply status;
Resistance value per meter:
Gross weight, net weight;
Operation number, inspection code;
Batch number and manufacturing date.
6.3 Transportation and storage
6.3.1 Alloy wire that meets the packaging requirements of Article 6.1 may be transported by general means of transportation. 6.3.2 Alloy wire shall be stored in packaging, and there shall be no alkaline or acidic corrosive media in the air. 6.4 Quality certificate
The quality certificate of alloy wire shall comply with the requirements of GBn112. Additional remarks:
This standard is proposed and managed by the Shanghai Electric Science Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shanghai Electric Science Research Institute of the Ministry of Machinery Industry, Shanghai Alloy Factory, and Sichuan Instrument Factory. The main drafter of this standard was Ji Shunkang.
People's Republic of China
Mechanical Industry Standard
High Resistance Heating Alloy Wire
Technical Conditions (Φ<0.20mm)
JB/T71171993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Sheet X/X
K Number of words xXXXXX
Format 880×1230
Edition X in xX month, 19XX
Printing in X in XX month, 19XX
Number of copies 1-xXX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standard Service Network: http://www.JB.ac.cn66_ F
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