85

Substitute: 70, 75, 80.

Springs, friction discs and other parts to which the requirements of high strength and elastic properties and wear resistance.

Classification

Country Section Category
CIS, Russia, Ukraine Structural steel Spring-spring structural steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % P, % C, % S, %
GOST 14959-79 97.16–98.51 0.17–0.37 0.5–0.8 < 0.25 < 0.2 < 0.25 < 0.035 0.82–0.9 < 0.035

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$
20 1.91

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{P}$$, $$MPa$$ $$\psi$$, % d5, % Treatment
Hire GOST 14959-79 1130 980 30 8 Tempering 820 ° C, oil, leave 470 ° C
The tape is annealed. GOST 2283-79 annealing 740 10
The tape is hardcore. GOST 2283-79 cold-work 740–1180

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Hire GOST 14959-79 raw 302
Hire GOST 14959-79 heat-treated 269

Technological Properties

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

Critical point temperatures

Ac1, K Ac3(Acm), K Ar1, K
720 730 700

Analogues

USA Germany European Union Bulgaria
G10860 1.1269 (Ck85) CS85 85

Standards

Standard Description
GOST 14959-79

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
$$E\cdot 10^{9}$$ $$MPa$$ Elastic modulus

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

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
Ar1 K