75
Round and flat springs of various sizes, valve springs of a car engine, shock absorber springs, springs, lock washers, clutch discs, eccentrics, spindles, shims and other parts operating under friction and under static and vibration loads.
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 |
97.26–98.61 |
0.17–0.37 |
0.5–0.8 |
< 0.25 |
< 0.2 |
< 0.25 |
< 0.035 |
0.72–0.8 |
< 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 |
|
|
|
1080 |
885 |
30 |
9 |
Tempering 820 ° C, oil, leave 470 ° C |
Brinell hardness number
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 |
735 |
700 |
Analogues
| USA |
Germany |
European Union |
Bulgaria |
|---|
| G10800 |
1.0605 (C75) |
CS75 |
75 |
Standards
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 |
|