U8A

The temperature of the critical points of the alloy: Ac1 = 720, Ar1 = 700, Mn = 245. Hardness after annealing (GOST 1435−99): HB 10 ^-1 = 187 MPa /

tool, working in conditions that do not cause heating of the cutting edge: cutters, countersinks, axes, chisels, chisels, saws longitudinal and circular, rolling rolls, center punches, screwdriver, combined pliers, side cutters.

Classification

Country	Section	Category
CIS, Russia, Ukraine	Tool steel	Carbon Tool Steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %
GOST 1435-99	97.807–98.91	0.17–0.33	0.17–0.28	< 0.2	< 0.25	< 0.25	< 0.025	0.75–0.84	< 0.018

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Physical characteristics

Temperature, °C	$$\rho$$, $$\frac{kg}{m^3}$$	$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20	7830	0.14

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\epsilon_L$$, %	Treatment
Tape	GOST 2283-79			cold-work	740–1180
Tape	GOST 2283-79			annealing	640–740	10–15

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Alloy	GOST 1435-99	annealing	1870

Critical point temperatures

Ac₁, K	Ar₁, K	Mn, K
720	700	245

Analogues

USA	Germany
W108	1.1525 (C80W1)

Standards

Standard	Description
GOST 1435-99

Description of chemical elements

Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Cu	%	Copper
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur

Description of physical characteristics

Parameter	Units of measurement	Description
$$\rho$$	$$\frac{kg}{m^3}$$	The density of the material
$$R\cdot 10^{-6}$$	$$\Omega\cdot m$$	Electrical resistivity

Description of mechanical properties

Parameter	Units of measurement	Description
$$\sigma _{U}$$	$$MPa$$	Ultimate tensile strength
$$\epsilon_L$$	%	Elongation at break (longitudinal)

Description of temperatures of critical points

Parameter	Units of measurement	Description
Ac₁	K
Ar₁	K
Mn	K