S1 (1.2550) Cold work tool steel

Specification

Shock-resisting tool steels are designated as group S steels according to the AISI classification system. S1, S2, S5, S6, and S7 are the types of shock-resisting steels. The hardenability of group S steels can be controlled by varying their composition instead of adjusting the melting procedures and grain size. These steels can obtain optimum hardness at higher austenitizing temperatures. The tempering resistance of group S steels can be enhanced by the addition of silicon, which also forms a microstructure to resist distortion in tempered conditions

Application

blanking dies for sheet metal, trimming dies, punches, ejectors, shear blades, pneumatic chisels.

Chemical Analysis %

C	Mn	Cr	Si	V	W	P	S
0.55-0.65	0.15-0.45	0.90-1.20	0.70-1.00	0.10-0.20	1.70-2.20	0.030 Max	0.030 Max

Delivery condition
Annealed 230 HB MAX
Heat Treatment

Soft Annealing	Cooling	Hardness	Hardening	Quenching	Hardness after quenching HRC
710-750°C	Furnace	230HB MAX	910-950°C	Oil or thermal bath,180-220°C 62	62

Tempering °C

Tempering°C	100	200	300	400
HRC	62	60	57	53