Фени 42 Стеклянные сплавы 4J42

Grade and chemical composition  

Grade

Mass fraction (%)

C

P

S

Mn

Si

B

Al

C0

Ni

Cr

Fe

≤

4J42

0.05

0.020

0.020

0.80

0.30

0.10

1.0

41.5~42.5

balance

tensile strength for strips 

status

tensile strength /MPa

soft

<590

hard

>820

hardness of strip in deep punching status 

deep punching

thickness/mm

Hardness HV

Fe-Ni-Cr

≤190

Fe-Ni

>2.5

≤190

≤2.5

≤165

heat treating regime and coefficient of linear expansion

Grade

Heat treatment on samples

a/(10-6/K)

20-300°C

20~400%

20-450°C

4J42

Heat the sample to (900±20)°C in hydrogen atmosphere, keep the temperature for one hour, cool to below 200°C at the speed ≤5°C/min then discharge

4.0~5.0

6.5~7.5

6.5~7.2

6.5~7.2

9.2~10.0

9.2~9.9

coefficient of expansion  

Grade

Average coefficient of expansion a/(10-6/K)

20~100°C 

20~200°C 

20~300°C 

20~400°C 

20~450°C

20~500°C

20~600°C

4J42

5.6

4.9

4.8

5.9

6.9

7.8

9.2