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Axle-centre Alloy Super elastic alloy Material 3J40

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last update: 2017-12-29 05:04
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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 (%)

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

I

 

Cold Drawing

450~510

 

Bend 90 degrees. 

No cracks and broken 

on the outside of the bending

Cold Drawn & Aging

780~830

>830~880

>880

480~540°C 

Keep warm for 5h

 

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

Coefficient of Linear Expansion/( 10-6/K)

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

Temperature Coefficient βf/( 10-6°C)

Mechanical Quality 

Factor Q20°C

20~-40°C

20~100°C

Solid Solution +80% Strain Rate

176500~196000

 

 

 

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

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


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