8x3

Temperature of critical points: Ac 1 = 785, Ac 3 (Ac m) = 830, Ar 3 (Arc m) = 770, Ar 1 = 750, Mn = 370. Hardness after annealing (GOST 5950−2000): HB 10 -1 = 241 MPa. Substitute 7Х3 .

tools (punches, matrices) hot landing fasteners and pieces of carbon and low-alloy structural steels on horizontal forging machines, dies parts (matrices, punches, ejectors) for hot pressing and extrusion, bending and grooved stamps

Classification

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

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ti, % Cu, % Ni, % V, % P, % C, % S, % Mo, % W, %
GOST 5950-2000 93.16–95.8 0.1–0.4 0.15–0.45 3.2–3.8 < 0.03 < 0.3 < 0.4 < 0.15 < 0.03 0.75–0.85 < 0.03 < 0.2 < 0.2

Information on suppliers

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 1340 1270 8 25 340 Tempering 870 ° C, oil, leave 500 ° C, 2 h

Brinell hardness number

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

Critical point temperatures

Ac1, K Ac3(Acm), K Ar3(Arcm), K Ar1, K Mn, K
785 830 770 750 370

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 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

Description of temperatures of critical points

Parameter Units of measurement Description
Ac1 K
Ac3(Acm) K
Ar3(Arcm) K
Ar1 K
Mn K