20HGSFL
cast, machine parts svarnolitye for northern, hydraulic box; responsible welded-cast construction of large sections of career and draglines.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Steels and alloys for castings |
Ordinary steel for castings |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
Cu, % |
Ni, % |
V, % |
P, % |
C, % |
S, % |
|---|
| GOST 21357-87 |
96.31–98.09 |
0.5–0.7 |
0.9–1.3 |
0.3–0.6 |
< 0.3 |
< 0.4 |
0.07–0.13 |
< 0.02 |
0.14–0.22 |
< 0.02 |
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 |
|---|
| Castings |
GOST 21357-87 |
< 100 |
|
|
500 |
320 |
18 |
30 |
500 |
Normalization of 900-920 ° C, 630-650 ° C and Holidays |
| Castings |
GOST 21357-87 |
|
|
|
600 |
450 |
14 |
25 |
|
Hardening in water 900-920 ° C, 650-670 ° C and Holidays |
Casting and technological parameters
| linear shrinkage, % |
|---|
| 1.5–2.5 |
Technological Properties
| Propensity to temper brittleness |
|---|
| inclined |
Critical point temperatures
| Ac1, K |
Ac3(Acm), K |
Ar3(Arcm), K |
Ar1, K |
Mn, K |
|---|
| 740–750 |
850–920 |
750–770 |
500–600 |
365–380 |
Heat Treatment Modes
| Treatment |
|---|
| Normalization 900 - 920 ° C, Vacation 630 - 650 ° C |
| Water hardening 900 - 920 ° C, Release 650 - 670 ° C |
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Cu |
% |
Copper |
| Ni |
% |
Nickel |
| V |
% |
Vanadium |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
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 the casting and technological parameters
| Parameter |
Units of measurement |
Description |
| linear shrinkage |
% |
The difference between model dimensions and the model casting |
Description of temperatures of critical points
| Parameter |
Units of measurement |
Description |
| Ac1 |
K |
|
| Ac3(Acm) |
K |
|
| Ar3(Arcm) |
K |
|
| Ar1 |
K |
|
| Mn |
K |
|