9XC

For drills, reamers, taps, dies, dies, cutters, stamps for cold work.

drills, reamers, taps, dies, combs, cutters, machine shtampeli, stamps for cold work. Critical parts, which material must have high wear resistance, fatigue strength under bending, torsional loading pin and elastic properties.

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %	W, %
GOST 5950-2000	94.26–96.7	1.2–1.6	0.3–0.6	0.95–1.25	< 0.03	< 0.3	< 0.4	< 0.15	< 0.03	0.85–0.95	< 0.03	< 0.2	< 0.2

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Physical characteristics

Temperature, °C	$$E\cdot 10^{9}$$, $$MPa$$	$$\rho$$, $$\frac{kg}{m^3}$$	$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20	190	7830	0.4

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{P}$$, $$MPa$$	$$\epsilon_L$$, %	$$\psi$$, %	$$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$	Treatment
Alloy					790	445	26	54	390	delivery condition

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Alloy	GOST 5950-73	annealing	241

Technological Properties

Weldability	Flake Susceptibility	Propensity to temper brittleness
Not applicable for welded structures	not sensitive	inclined

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Ar₁, K	Mn, K
770	870	730	160

Analogues

Germany
1.2108 (90CrSi5)

Standards

Standard	Description
GOST 5950-2000	GOST

Description of chemical elements

Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Ti	%	Titan
Cu	%	Copper
Ni	%	Nickel
V	%	Vanadium
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Mo	%	Molybdenum
W	%	Tungsten

Description of physical characteristics

Parameter	Units of measurement	Description
$$E\cdot 10^{9}$$	$$MPa$$	Elastic modulus
$$\rho$$	$$\frac{kg}{m^3}$$	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
$$\sigma_{P}$$	$$MPa$$	Proportionality limit
$$\epsilon_L$$	%	Elongation at break (longitudinal)
$$\psi$$	%	Reduction in cross section on fracture
$$KCU\cdot 10^{3}$$	$$\frac{J}{m^2}$$	Impact toughness

Designation of types of weldability

Parameter	Units of measurement	Description
no limits		Welding is performed without heating and without subsequent heat treatment
Boundedly welded		Welding is possible with heating up to 100–120 °C and subsequent heat treatment
Difficult to weld		For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing
Not applicable for welded structures

Description of temperatures of critical points

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