Steel 55S2

Designation

Name The value
Designation GOST Cyrillic 55С2
Designation GOST Latin 55C2
Transliteration 55S2
By 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 strips В23 GOST 103-2006
Bars and shapes 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 strips В33 GOST 4405-75, TU 14-1-1409-75, TU 14-1-1986-77, TU 14-130-278-96
Bars and shapes 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 Rest ≤0.2
Fe is the basis.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, 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
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number
HRC Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature Е, HPa G, HPa
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.
Склонность к отпускной хрупкости tend not
The temperature of forging 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
Machinability In hot-rolled condition with HB 255-269 Kn TV.SPL.=0.65 Kn b.St.=0.33