H-21 (1.2581) Hot work tool steel

Specification

The primary alloying elements in tungsten hot work tool steel include tungsten, chromium, carbon, and vanadium. They are resistant to distortion when they are air hardened, and have higher hardening temperature when compared to chromium hot work tool steel. Breakage of the tungsten hot work tool steel can be reduced if they are preheated to operating temperature before use. Thermal shock resistance and toughness of these hot work tool steel can be improved by reducing the carbon content.

Application

This material is highly recommended for difficult hot work tooling applications such as brass extrusion, brass dies casting, hot punches, forging die inserts, punches for making nuts and bolts, die holders, ejector discs, extrusion liners etc.

Chemical Analysis %

C	Mn	Cr	Si	W	P	S	V
0.25-0.36	0.15-0.40	2.50-3.75	0.15-0.50	8.50-10.00	0.030 Max	0.030 Max	0.30-0.60

Delivery condition
Annealed 235 HB max
Heat Treatment

Soft Annealing	Cooling	Hardness	Hardening	Quenching	Hardness after quenching HRC
790-830°C	Furnace	235 HB	1110-1150°C	oil or Thermal bath. 520-540°C	52

Tempering °C

Tempering°C	100	200	300	400	500	600	700
HRC	52	51	50	50	51	51	50