Axle-centre Alloy Super elastic alloy Material 3J40
Precision Alloy 3J40
Shock-proof & Wear Resistant axle-centre alloy(YB/T5243-1993)
Usage: It is applied to produce the axle-centre of instrument and meter as well as the axle-centre of the staff
Grade and Chemical Composition (see Table1)
Table1 Grade and Chemical Composition
Grade |
Chemical Composition (%) |
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C |
P |
S |
Mn |
Si |
Fe |
Cr |
A1 |
Ce |
Ni |
|
≤ | ||||||||||
3J40 |
0.03 |
0.010 |
0.010 |
0.10 |
0.20 |
0.50 |
39.0~41.0 |
3.30~3.50 |
0.10~0.2 |
Balance |
©Based on addition
Mechanical Property (see Table 2)
Table 2 Mechanical Property
Statue |
Vickers Hardness/ HV |
Commended Heat Treatment |
Bend Test The radius of the mandrel is twice as the diameter of the alloy |
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I |
Ⅱ |
Ⅲ |
|
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Cold Drawing |
450~510 |
|
Bend 90 degrees. No cracks and broken on the outside of the bending |
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Cold Drawn & Aging |
780~830 |
>830~880 |
>880 |
480~540°C Keep warm for 5h |
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Note: 1.The default hardness classification of the alloy wire in cold drawing & aging status is class II.
Physical Property (see Table 3—Table 5)
Table 3 Coefficient of Linear Expansion
State |
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20~55°C |
20~100°C |
20~200°C |
20~300°C |
20~400°C |
20~500°C |
|
Solid Solution |
12.2~12.7 |
12.4~12.5 |
12.6~12.8 |
13.0~13.1 |
13.5~13.6 |
13.8~14.0 |
Solid Solution&aging |
11.0~11.5 |
11.9~12.0 |
12.0~12.2 |
12.4~12.5 |
12.7~12.8 |
13.1~13.3 |
Cold Drawn & aging |
11.6 |
12.0 |
12.1 |
12.4 |
12.8 |
13.3 |
Table 4 Modulus of Elasticity & Frequency Temperature Coefficient
State |
Modulus of Elasticity |
Mechanical Quality Factor Q20°C |
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20~-40°C |
20~100°C |
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Solid Solution +80% Strain Rate |
176500~196000 |
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|
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Solid Solution +80% Strain Rate+Aging 5h |
225500~235500 |
-103~-106 |
-104~-110 |
49000~51000 |
Table 5 Magnetic Susceptibility & Resistivity
State |
Magnetic Susceptibility |
Resistivity/(μΩ•m) |
Density/(g/cm³) |
|
H=40KA/m |
H:80KA/m |
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Solid Solution |
3.5~4.5 |
3.5~4.6 |
|
7.6 |
Solid Solution+ Aging |
3.8~4.0 |
2.4~4.2 |
|
|
Solid Solution+ Cold Drawing |
2.8~3.0 |
|
1.21 |
|
Solid Solution +69% Strain Rate+Aging |
|
|
0.78 |
|
Corrosion Resisting Property (See Table 5)
Table 5 Corrosion Resisting Property
State |
Salt Fog Test |
Longtime Store in The Air |
Cold Drawing+ Solid Solution+Aging |
No corrosion after 240 hours (Tested by the buyer per JB1606) |
No corrosion |