R9

Substitute: R18

For the manufacture of simple tools that do not require a large amount of grinding, for the treatment of conventional structural materials.

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Tool steel	High speed tool steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Co, %	Cr, %	V, %	C, %	Mo, %	W, %
Standard	Fe, %	Si, %	Mn, %	Co, %	Cr, %	V, %	C, %	Mo, %	W, %
GOST 19265-73	79.65–82.45	< 0.5	< 0.4	< 0.5	3.8–4.4	2–2.6	0.85–0.95	< 1	8.5–10

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
20	2.2		8300	0.38
100		23		0.417
200		25		0.505
300		26		0.6
400		28		0.695
500		30		0.79
600		31		0.9
700				1.02
800				1.16
900				1.17

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	d5, %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	d5, %	Treatment
Alloy					840	490	29	260	10	delivery condition
The tape is annealed.	GOST 2283-79	0.1–4		annealing	880

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Alloy		annealing	255

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K	Mn, K
Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K	Mn, K
820	870	780	740	180

Standards

Standard	Description
Standard	Description
GOST 19265-73
GOST 2283-79	GOST 2283-79

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Co	%	Cobalt
Cr	%	Chrome
V	%	Vanadium
C	%	Carbon
Mo	%	Molybdenum
W	%	Tungsten

Description of physical characteristics

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$E\cdot 10^{9}$	$MPa$	Elastic modulus
$\varkappa$	$\frac{W}{m\cdot K}$	Coefficient of thermal conductivity (the heat capacity of the material)
$\rho$	$\frac{kg}{m^3}$	The density of the material
$R\cdot 10^{-6}$	$\Omega\cdot m$	Electrical resistivity

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
d5	%	Elongation at break
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\sigma_{P}$	$MPa$	Proportionality limit
$\psi$	%	Reduction in cross section on fracture
$KCU\cdot 10^{3}$	$\frac{J}{m^2}$	Impact toughness

Description of temperatures of critical points

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
Ac₁	K
Ac₃(Ac_m)	K
Ar₃(Arc_m)	K
Ar₁	K
Mn	K