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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

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