Available Shapes
S1 Tool Steel
Chrome-Tungsten Shock Resistant Steel
AISI S1 is a versatile chrome-tungsten shock-resisting tool steel. Its properties provide excellent service in both cold and hot work shock applications. In addition, it is widely used for master hobs.
Its low carbon content provides toughness and its combination of alloying elements provides the carbide formation necessary for abrasion resistance, the hardenability necessary for shock tools, and improved hot work characteristics.
For additional wear resistance, tools of SI may be carburized during pack hardening
Related Specifications
AISI ASTM A681 DIN 17350 BS EN ISO 4957
Applications
Typical Analysis
Forging
Annealing
Stress Relieving
Hardening
Tampering
Applications
Heavy duty blanking and forming dies, punches, chisels, shear blades, slitter knives, cold striking dies, cold extrusion tools, coining dies, master hobs.
Typical Analysis
Carbon | 0.50% | Chromium | 1.00% |
Tungsten | 2.00% | Silicon | 0.70% |
Vanadium | 0.20% |
Forging
S1 tool steels are uniformly preheated at 1000°C (1832°F). These steels are then forged at temperatures ranging from 800 to 1000°C (1472 to 1832°F). This process is followed by cooling in a furnace to avoid stress.
Annealing
Annealing is carried out in S1 tool steels by uniformly heating the steels to 770°C (1418°F) followed by equalization. These steels are then cooled in the furnace.
Stress Relieving
S1 tools steels are heated up to 700°C (1292°F) before hardening, equalized, and then slowly cooled in order to remove stresses during heavy machining operations.
Hardening
S1 tools steels are preheated to 650°C (1202°F) and soaked. They are then continuously heated to the final temperature that ranges from 900 to 950°C (1652 to 1742°F). Finally, the steels are quenched in oil.
Tampering
S1 tool steels are tempered by uniformly heating the steels at the preferred tempering temperature followed by holding for an hour.
Temperature [°C] | 150 | 200 | 250 | 350 | 400 |
Hardness [HRc] | 58-56 | 56-54 | 55-53 | 53-51 | 52-49 |