This standard specifies the technical requirements, test methods and inspection rules for heating resistance alloys. This standard applies to heating resistance alloys used in the manufacture of heating elements in low-voltage electrical appliances such as heat load relays and low-voltage circuit breakers. JB/T 6454-1992 Technical requirements for heating resistance alloys JB/T6454-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 6454-1992
Technical Conditions for Heating Resistance Alloys
Published on August 6, 1992
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Heating Resistance Alloys
Subject Content and Scope of Application
This standard specifies the technical requirements, test methods and inspection rules for heating resistance alloys. JB/T6454-1992
This standard applies to heating resistance alloys used in manufacturing thermal elements in low-voltage electrical appliances such as thermal overload relays and low-voltage circuit breakers. Cited standards
GB223.1~223.24
GB6146
GB8888
ZBK14003.1~003.11
3 Product classification
3.1 Varieties and codes
Chemical analysis methods for steel and alloys
Metal tensile test methods
Resistivity test methods for precision resistance alloys
Packaging, marking, transportation and storage of heavy non-ferrous metal processing productsChemical analysis methods for iron-chromium-aluminium alloys
The varieties and codes of heating resistance alloys are listed in Table 1. Table 1
1992-08-06 approved by the Ministry of Machinery and Electronics Industry ResistivitywwW.bzxz.Net
(20℃)
Varieties and codes
Maximum operating temperature
Corrosion resistance
Good
Weldability
Processability
Precautions
1993-01-01 implementation|| tt||Nickel-chromium-iron
Iron-chromium-aluminum
NCF072
NCF104
NCF113
FCA126
FCA137
FCA142
FCA153
3.2 Types and specifications
3.2.1 Type
JB/T 6454-1992
Continued Table 1
Resistivity
20 ℃)
Maximum operating temperature
Heating resistor alloys have three types of products: round wire, flat wire and strip. Diameter of round wire
Width of flat wire
Thickness of fan wire
Width of strip
Thickness of strip
3.2.2 Specification
0.16~3.00mm
0.20~8.00mm.
0.08~0.80mm.
>8.00~80.00mm,
0.08~2.80mm,
Common product specifications are listed in Appendix C, Appendix D, and Appendix E. 3.3 Marking
3.3.1 Marking composition
Heating resistance alloy
Note, soft state (R), semi-hard state (BY).
3.3.2 Marking example
Application characteristics
With toughness
And corrosion resistance
Fluorination resistance
Weldability
Processability
-Standard number
Notes
Nominal cross-sectional size
Supply status: R, BY
Product code
Product name
Example 1: NC010 heating resistance alloy semi-hard flat wire, nominal cross-sectional size is 0.1×5.6mm, marked as: heating resistance Alloy NC010BY0.1×5.6JB/T6454-92.2: NCF104 heating resistance alloy soft round wire, nominal diameter is 0.8mm, marked as: heating resistance alloy NCF104R0.8JB/T6454--92.2
Technical requirements
4.1 Chemical composition
The chemical composition of the heating resistance alloy is listed in Table 2, representative
NCF072
NCF104
NCF113
FCA126
PCA137
FCA142
FCA153
Physical properties
JB/T 6454-1992
Table 2 Chemical composition
The nominal values ​​of the main physical properties in the softened annealed state are listed in Appendix A. Mechanical properties
The main mechanical properties are listed in Table 3.
NCF072
NCF104
NCF113
FCA126
FCA137
FCA142
FCA153
Tensile strength
(minimum value)
JB/T 6454-1992
Mechanical properties in the softened annealed state at 20℃
Elongation (Ls=100mm) (minimum value)
>0.25~0.50
Corrosion resistance
The corrosion resistance of the alloy in the softened annealed state is shown in Appendix B. 4.5
Surface quality
>0.50~1.00
The material surface should be smooth and clean, and no cracks, local micro-inclusions exceeding half of the thickness or diameter tolerance,
peeling,
small defects and oxidation color that affect the use are allowed. Resistivity tolerance
The nominal values ​​of the resistivity of various alloys in the annealed and softened state at 20°C are listed in Table 1, and the tolerance should comply with the provisions of Table 4. Table 4
Dimension tolerance
Resistivity tolerance at 20°C
Dimension tolerance of round wire and flat wire should comply with the provisions of Table 5. Due to wire diameter
0.1648<0.30
0.50≤01.10
1.60≤2.20
2.2043.00
Note:?
JB/T6454-1992
Permissible deviation of round wire and flat wire size
Thickness of flat wire
0.080≤t<0.090
0.0900.140
0.1 400.200
0.200<0.280
0.280≤0.425
0.425≤<0.630
0.630<0.800
Tight wire width
0.20~8.00
Take twice the unidirectional allowable deviation value in the table,
When the allowable deviation is specified as (+) or (-), W is the width, and the allowable deviation of its size is calculated to 2 decimal places, 4. 7. 2
The roundness of round wire shall not exceed half of the allowable deviation range specified in Table 5. The allowable deviation of material thickness shall comply with the provisions of Table 6. Table 6
Allowable deviation of strip thickness
0.080≤0.090
0.090≤<0.140
0.140≤t<0.200
0.200t<0.280
0.280≤t<0.425
0.425t<0.630
0.630≤t<0.90
0.90t<1.40
1.40<2.00
2.00≤<2.80
The allowable deviation of strip width shall comply with the provisions of Table 7. Table 7
0.08≤<0.20
8≤W<13
13W<25
25≤W<50
50≤W<80
Permissible deviation of strip width
0.20<0.425
0.425≤t<0.90
The allowable deviation of lateral curvature of flat wires and all strips with a width of more than 6mm shall comply with the provisions of Table 8 and shall be limited to one direction.
JB/T 6454-1992
Table 8 Permissible deviation of lateral curvature of some flat wires and strips Shoulder wire and strip width
13W<25
25≤W<50
Resistance per meter
4.8.1 Standard meter resistance
Allowable deviation of lateral curvature
(Anywhere on a length of 1000mm)
Maximum value of lateral curvature
(mm)
The standard resistance per meter of round wire, flat wire and strip (hereinafter referred to as standard meter resistance) is calculated by the following formula. Re=P2a/A
Standard meter resistance at 20℃, a/m;
Where, Re
+++e+see
P2e——Nominal resistivity value at 20C, which is the resistance characteristic of each alloy listed in Table 1; A—effective cross-sectional area, mm\, is calculated based on the given cross-sectional nominal size. The cross-sectional area of ​​fan wire is calculated by the following approximate formula. Nominal width of fan wire, mm;
Where, w-
tNominal thickness of flat wire, mm.
AWt-0.155t2
++++++++
The standard resistance per meter of commonly used round wire, flat wire and strip are listed in Appendix C, Appendix D and Appendix E respectively. Flat wire is rolled flat by round wire, and its cross section is drum-shaped, and the radius of curvature of the drum arc is r%0.625t. Based on this, the approximate calculation formula of the effective cross-sectional area of ​​the resin wire is obtained through geometric calculation,
similar calculation formula, ||tt| ...
Allowable deviation of round wire resistance per meter
Wire diameter range
0.16≤1.000
1.0060≤3.00
Width-thickness ratio
JB/T 6454-1992
0Allowable deviation of flat and strip resistance per meter
Nickel-chromium-iron
Iron-chromium-aluminum
The percentage deviation of the measured resistance per meter to the standard resistance per meter shall be calculated according to the following formula. The calculated percentage deviation must be within the allowable deviation. (Convert the measured value of meter resistance to the value at 20℃1)×100% (3) Percentage deviation -
Standard meter resistance value
Resistance uniformity
The maximum difference of actual resistance per meter in two or more sections of each roll (axis) of round wire or flat wire in the whole length range to the percentage of the nominal resistance per meter on the nameplate is called the meter resistance full length difference, and its value represents the resistance uniformity of the product. Table 11 specifies the allowable deviation of the meter resistance full length difference (meter resistance full length tolerance),
Allowable deviation of meter resistance full length difference
Test method
The analysis of chemical composition shall be carried out in accordance with GB223.1~223.24 and ZBK14003.1~003.11. 5.2 Surface quality shall be inspected by visual inspection with a magnifying glass of more than six times. 5.3 Dimensional inspection
Iron-chromium-aluminium
When the diameter of the round wire is less than 2.20mm, and the thickness of the flat wire and strip is less than 0.28mm, use a micrometer with a graduation value of 0.001mm to measure. When the diameter of the round wire is greater than or equal to 2.20mm, and the thickness of the flat wire and strip is greater than or equal to 0.28mm, use an external micrometer with a graduation value of 0.01mm to measure.
5.3.2 For the measurement of the diameter of the round wire, take a sample with a length of not less than 1m, and measure it in two mutually perpendicular directions on the same cross section perpendicular to the axis of the sample, and measure at least three times at both ends and the middle of the sample. The average value of the 6 measurement data is taken as the diameter of the round wire. 5.3.3 For the measurement of the thickness of the flat wire and strip, it is carried out at a distance of not less than 100mm from both ends, and the measurement is carried out three times, and the average value is taken as the thickness. 5.3.4 The width of the flat wire and strip is measured with a vernier caliper with a graduation value of 0.02mm. The measurement is carried out at a distance of not less than 100mm from both ends, and the measurement is carried out three times, and the average value is taken as the width.
5.3.5 When measuring the directional curvature of flat wire and strip, place the sample with a length greater than 1m flat on a flat plate, and use a 1m long standard ruler to press against its side, and the maximum distance from the top of the curved arc to the ruler is the lateral curvature (mm). Use a vernier caliper with a graduation value of 0.02mm for measurement.
Resistivity and meter resistance measurement
1The resistance value per meter or the resistivity is measured in accordance with GB6146. 5. 4 1
: For the test of the uniformity of the full length of the resistance value per meter, it is recommended to use a meter resistance continuous measuring device with an accuracy of ±2% for testing. 5. 4. 2
5.5The elongation is measured in accordance with GB228.
Inspection rules
Products shall be inspected and qualified by the quality inspection department of the manufacturer or the corresponding production department and accompanied by a product certificate before they can leave the factory. 6.1
Factory acceptance inspection items
JB/T 6454-1992
The various tests that must be carried out when the product is delivered are called factory inspections, and the main items include: a.
Surface quality;
Dimensions;
Resistivity or resistance per meter;
Uniformity of resistance per meter:
Supply status.
Note: When the resistivity, resistance per meter and dimensions are specified at the same time, only the allowable deviation of one or two of them can be specified according to the agreement between the supply and demand parties, and the rest are reference values. Sampling and batching rules
When it is necessary to analyze the chemical composition of the alloy, each furnace should be inspected. 6.3.1
6.3.2 Products are delivered in batches, and each batch of products shall consist of the same variety and specification. Sampling inspection shall be carried out according to the inspection items, and the sampling percentage is shown in Table 12. The number of batch samples for each item shall be no less than three rolls (spools) for round wire and flat wire, and no less than three strips for strip. Table 12
6.4 Judgment rules
Inspection items
Surface quality
Electric mouse rate
Resistance per meter
Electric function difference in total length of meter
Elongation
Inspection items Sampling ratio
Batch sampling number
64.1 Only one test shall be conducted on any inspected product itself or the sample taken away. The samples for each test should be sampled on the same roll (spindle) as far as possible. If one item in the inspection result is unqualified, double samples should be drawn from the uninspected products for re-inspection. If there are still unqualified results after the re-inspection, each roll (spindle) should be fully inspected. 6.4.2 After inspection or re-inspection, it is confirmed that the technical requirements of all test items are met, and it is judged to be fully qualified. If one of the meter resistance value and meter resistance full length difference rate, which are the main assessment indicators, is unqualified, it is judged to be completely unqualified. Marking, packaging, transportation, storage
7.1 Supply method
7.1.1 Products are generally supplied in annealed state (i.e. soft state). If the user requires semi-hard supply, it should be indicated in the order contract. 7.1.2 Round wire, flat wire and strip with a width less than 20 mm must be supplied in rolls (spools). Each roll (spool) should be wound with a single wire and its net weight should not be less than the value specified in Table 13.
Effective cross-sectional area
0.05≤S<0.06
0.06≤S<0.08
0.08≤5<0.10
0.10≤S0.20
0.20≤S<0.30
0.308 0.40
0.40≤S<0.50
0.50≤S<0.60
0.60≤5<0.80
0.80≤S<1.00
1.004S<4.00
JB/T6454-1992
Minimum net weight per roll (spool)
3 Strips with a width greater than or equal to 50mm can be supplied in strips, and the length of each strip must be greater than 1200mm. 7. 1. 3
7.2 Marking
The following items must be marked on the product in an appropriate manner; a.
Variety and code;
Size (nominal value):
m resistance or resistivity,
m resistance total length difference;
Net weight:
Production batch number;
Year and month of production;
Manufacturer name or trademark,
Packaging, transportation and storage
Packaging, transportation and storage shall be carried out in accordance with the provisions of GB8888, weight
NCF072
NCF104
NC F113
FCA126
FCA13?
FCA142
FCA153
Resistance temperature coefficient
(20—600℃)
X10~5/~C
JB/T6454-1992
Appendix A
Physical properties
(reference)
, MC012 resistance temperature coefficient measurement temperature range 20~105C. 10
(20℃)
Conductivity
(20°C)
Linear average
Coefficient of thermal expansion
10~*/k
(20~400℃)
Thermoelectric potential of copper
(0~100°C)
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