|
 |
|
| DIVISION |
SYMBOL |
A: ANNEALED |
ROLLED |
| HARDNESS (Hv) |
T/STRENGTH (Kgf/mm2) |
ELONGATION (%) |
HARDNESS (Hv) |
| carbon tool steel |
SK2 |
220 MAX |
60~70 |
15 MIN |
220~280 |
| SK3 |
220 MAX |
60~70 |
15 MIN |
220~280 |
| SK4 |
210 MAX |
50~70 |
20 MIN |
210~270 |
| SK5 |
200 MAX |
50~70 |
20 MIN |
210~270 |
| spring steel |
SUP6M |
210 MAX |
125 MIN |
9MIN |
210~310 |
| SUP9M |
200 MAX |
125 MIN |
9MIN |
200~290 |
| SUP10M |
200 MAX |
125 MIN |
9MIN |
200~290 |
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