R18

Substitute: P18.

For all types of cutting tools in the processing of carbon, alloyed, structural steels.

Steel has a reduced tendency to overheat during hardening, good viscosity, good wear resistance, and high grindability.

Cutters, drills, milling cutters, thread mills, bit cutters, reamers, countersinks, taps, broaches for processing structural steels with a strength up to 1000 MPa, which require preserving the cutting properties when heated during operation up to 600 ° C.

Classification

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

Chemical composition

Standard Fe, % Si, % Mn, % Co, % Cr, % Cu, % Ni, % V, % P, % C, % S, % Mo, % W, %
GOST 19265-73 71.46–74.66 0.2–0.5 0.2–0.5 < 0.5 3.8–4.4 < 0.25 < 0.6 1–1.4 < 0.03 0.73–0.83 < 0.03 < 1 17–18.5

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20 2.28 8800 419
100 2.23 26 472
200 2.19 27 544
300 21 28 627
400 2.01 29 718
500 1.92 28 815
600 1.81 27 922
700 27 1037
800 1152
900 1173

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
Alloy GOST 19265-73 840 510 10 0.19 8 delivery condition

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy GOST 19265-73 annealing 255

Technological Properties

Weldability
no limits

Critical point temperatures

Ac1, K Ac3(Acm), K Ar3(Arcm), K Ar1, K
820 860 770 725

Analogues

Germany USA European Union
1.3355 T1 HS18-0-1

Standards

Standard Description
GOST 19265-73

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Co % Cobalt
Cr % Chrome
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
$$\varkappa$$ $$\frac{W}{m\cdot K}$$ 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
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

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(Acm) K
Ar3(Arcm) K
Ar1 K