HV4

Hardness HB4 after annealing HB 10 ^-1 = 285 MPa

for piercing Poisson, tools for fine cutting of solid materials with low speed and engraving work

Country	Section	Category
CIS, Russia, Ukraine	Tool steel	Alloy tool steel

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %	W, %
TU 5950-73	91.79–94.4	0.15–0.35	0.15–0.4	0.4–0.7	< 0.3	< 0.35	0.15–0.3	< 0.03	1.25–1.45	< 0.03	3.5–4.3

USA
F2

Standard	Description
TU 5950-73