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
Steel castings	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	Rest

Fe is the basis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d	y, %	KCU, kJ/m²
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
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d	Elongation after rupture
y	The relative narrowing
KCU	Toughness

Physical characteristics

Temperature	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C	С, J/(kg · °C)
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.
Склонность к отпускной хрупкости	tend not
Flock-sensitive sensitivity	not sensitive
Machinability	In the heat treated condition in NV 196-207 and blower SB=590 MPa Kn TV.SPL.=0.7 Kn b.St.=0.55

Steel 55SL

Designation

Description