Steel 55S2
Designation
| Name |
The value |
| Designation GOST Cyrillic |
55С2 |
| Designation GOST Latin |
55C2 |
| Transliteration |
55S2 |
| The chemical elements |
55С2 |
Description
Steel 55S2 is used: for the manufacture of hot rolled plates; coil springs and leaf springs used in automobile and tractor industry, railway transport and other branches of engineering.
Note
Steel spring alloy.
Standards
| Name |
Code |
Standards |
| Sheets and stripes |
В23 |
GOST 103-2006 |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Steel wire medium- and high-carbon |
В72 |
GOST 26366-84 |
| Sheets and stripes |
В33 |
GOST 4405-75, TU 14-1-1409-75, TU 14-1-1986-77, TU 14-130-278-96 |
| Sectional and shaped rolling |
В32 |
GOST 7417-75, GOST 7419-90, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 14959-79, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| GOST 14959-79 |
0.52-0.6 |
≤0.035 |
≤0.035 |
0.6-0.9 |
≤0.3 |
1.5-2 |
≤0.25 |
The rest |
≤0.2 |
Fe is the basis.
Mechanical characteristics
| Section, mm |
t отпуска, °C |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
HRC |
| Hot-rolled sheet. Normalization at 840 °C |
| 80 |
- |
≥370 |
≥690 |
- |
≥35 |
- |
≤197 |
- |
| Samples 17-22 mm. Annealing at 900 °C (extract 2 h) + Quenching in oil from 850 °C + Vacation (excerpt 2 h) cooling furnace |
| - |
300 |
≥1960 |
≥2250 |
≥5 |
≥20 |
- |
- |
- |
| Sheet. Isothermal quenching from 870 °C and cooled in molten salt (tсоли=300 °C) |
| 3.9 |
- |
≥1220 |
≥1640 |
- |
- |
- |
- |
≥47 |
| Samples 17-22 mm. Annealing at 900 °C (extract 2 h) + Quenching in oil from 850 °C + Vacation (excerpt 2 h) cooling furnace |
| - |
400 |
≥1670 |
≥1830 |
≥8 |
≥39 |
- |
- |
- |
| Sheet. Isothermal quenching from 870 °C and cooled in molten salt (tсоли=360 °C) |
| 3.9 |
- |
≥1110 |
≥1350 |
- |
- |
- |
- |
≥42 |
| Samples 17-22 mm. Annealing at 900 °C (extract 2 h) + Quenching in oil from 850 °C + Vacation (excerpt 2 h) cooling furnace |
| - |
500 |
≥1270 |
≥1350 |
≥12 |
≥39 |
- |
- |
- |
| - |
600 |
≥830 |
≥1080 |
≥15 |
≥42 |
- |
- |
- |
| Rolled steel. Annealing at 750-780 °C, cooling with the furnace |
| - |
- |
≥440 |
≥760 |
≥21 |
≥42 |
≥157 |
≤222 |
- |
| Rolled steel. Steel categories: 3, 3A, 3B, 3C, 3D, 4, 4A, 4B. Quenching in oil or water from 870 °C to + vacation at 470 °C |
|
- |
≥1175 |
≥1270 |
≥6 |
≥30 |
- |
- |
- |
| Rolled steel. Quenching in oil from 870 °C to + Vacation |
| - |
350 |
≥1860 |
≥2030 |
≥7 |
≥31 |
≥226 |
- |
≥50 |
| - |
400 |
≥1830 |
≥1910 |
≥9 |
≥36 |
≥265 |
- |
≥48 |
| - |
450 |
≥1470 |
≥1530 |
≥11 |
≥46 |
≥402 |
- |
≥44 |
| - |
500 |
≥1130 |
≥1220 |
≥12 |
≥47 |
≥471 |
- |
≥41 |
| - |
550 |
≥1060 |
≥1180 |
≥13 |
≥50 |
≥549 |
- |
≥34 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Physical characteristics
| Temperature |
Е, ГПа |
G, ГПа |
| 0 |
196 |
78 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| G |
Modulus of elasticity shear torsion |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Weldability |
does not apply to welded structures. |
| Propensity to temper brittleness |
tend not |
| Forging temperature |
Start - 1200 °C, the end - of 800 °C. the cooling of the workpiece cross-section up to 250 mm in the air, 251-300 mm - in the pit. |
| Flock-sensitive sensitivity |
not sensitive |
| Workability by cutting |
In hot-rolled condition with HB 255-269 Kn TV.SPL.=0.65 Kn b.St.=0.33 |
