Steel 55SL
Designation
| Name |
The value |
| Designation GOST Cyrillic |
55СЛ |
| Designation GOST Latin |
55CL |
| Transliteration |
55SL |
| The chemical elements |
55С |
Description
Steel 55SL is used: for the manufacture of gear wheels and couplings handling machines, chassis, wheels, runners, gear sectors and rims, hubs, stingrays, bushings of toothed couplings and other parts, which are requirements of high hardness.
Standards
| Name |
Code |
Standards |
| Castings, steel |
В82 |
GOST 977-88 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Fe |
| GOST 977-88 |
0.52-0.6 |
≤0.045 |
≤0.045 |
0.5-0.8 |
0.5-0.7 |
The rest |
Fe is the basis.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d |
y, % |
kJ/m2, кДж/м2 |
| Annealing in air or in oil with 790-810 °C + vacation at 580-600 °C |
| - |
≥470 |
≥860 |
≥15 |
≥20 |
≥240 |
| Annealing in air from 820-850 °C + vacation at 650-720 °C, air cooling |
| 100 |
≥392 |
≥736 |
≥12 |
- |
- |
| Normalization at 840-880 °C + vacation at 650-720 °C |
| 100 |
≥334 |
≥687 |
≥10 |
- |
- |
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 |
| d |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
Physical characteristics
| Temperature |
r, кг/м3 |
l, Вт/(м · °С) |
a, 10-6 1/°С |
С, Дж/(кг · °С) |
| 0 |
7820 |
- |
- |
- |
| 20 |
7820 |
- |
- |
- |
| 100 |
- |
68 |
11 |
479 |
| 200 |
- |
55 |
11 |
479 |
| 400 |
- |
36 |
118 |
487 |
| 500 |
- |
32 |
- |
- |
| 600 |
- |
- |
134 |
525 |
| 800 |
- |
- |
145 |
571 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| С |
Specific heat |
Technological properties
| Name |
The value |
| Weldability |
difficult weldability. Method of welding: SMAW. Necessary preheating and subsequent heat treatment. |
| Propensity to temper brittleness |
tend not |
| Flock-sensitive sensitivity |
not sensitive |
| Workability by cutting |
In the heat treated condition in NV 196-207 and blower SB=590 MPa Kn TV.SPL.=0.7 Kn b.St.=0.55 |
