KAL TAB Shock Resistant Tool Steel (S7)
Equivalent Grade
| AISI | ASTM |
| S7 | ASTM A681-S7 |
Typical Saarloha Chemical Composition
| Element | C | Mn | Si | Cr | Mo | V | P | S |
| Min | 0.45 | 0.50 | 0.20 | 3.10 | 1.35 | – | – | – |
| Max | 0.55 | 0.80 | 0.50 | 3.50 | 1.50 | 0.15 | 0.020 | 0.005 |
Characteristics
- High mechanical fatigue resistance
- Excellent toughness at high strength levels
- Good wear resistance
- High hardenability & softening resistance at elevated temperature
Heat Treatment
Annealing :
Stress relief :
Heat to 840-850°C, hold as per 1″ inch per 30 mm , slow cool @ 35°C per hour to 550° C then air cool.
Annealed Hardness ~ 200 HBW.
Heat to 660-675°C, hold as per 1″ per 30 mm, then cool in still air.
Hardening
Pre-heating : Heat to ~750°C, equalize and heat to 940-950°C at the rate 100°C/1 hr max and quench in gas or oil, higher section may require higher agitation.
Tempering : Temper in 205-550°C depending upon the required hardness levels, soak for at least 1 hour per 25 mm of thickness. Double tempering is recommended.
Application
A combination of strength and high toughness makes it a candidate for a wide variety of tooling applications. It can be used for medium hot work dies as well as for medium run cold work tools and dies.
For tools with good resistance to impact and softening.
Tool Industry: forging dies, punches, chisels, hammer, hot heading dies and gripper dies.
Cutting Tool: shear blades
Note: Saarloha can delivered Kal TAB(VD Route) and KAL TAB ESR (Remelted Route)