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Characteristics for grade     55S2   ( 55С2 )

      Grade :     55S2   ( 55С2 )
      Substitute:   50С2, 60С2, 35Х2АФ
      Classification :   Spring structural steel
      Equivalent grades:   Go here



Chemical composition in % for grade   55S2   ( 55С2 )
C Si Mn Ni S P Cr Cu
0.52 - 0.61.5 - 20.6 - 0.9max   0.25max   0.035max   0.035max   0.3max   0.2


Temperature of critical points for grade   55S2   ( 55С2 ).
Ac1 = 755 ,      Ac3(Acm) = 810 ,       Ar3(Arcm) = 770 ,       Ar1 = 690 ,       Mn = 272


Mechanical properties under Т=20oС for grade   55S2   ( 55С2 )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
      760 440 21 42160Annealing 750 - 780oC,Cooling oven,
Rolled stock, GOST 14959-79     1270 1175 6 30 Guenching and drawing


    Brinell hardness for     55S2   ( 55С2 )   (without heat treatment) ,       GOST 14959 HB 10 -1 = 285   MPa
    Brinell hardness for     55S2   ( 55С2 )   (heat treatment) ,     Rolled stock GOST 14959-79 HB 10 -1 = 241   MPa


Technological properties for grade   55S2   ( 55С2 )
  Weldability: is not used.
 Flakes : not predisposed
Temper brittleness: not predisposed


Physical properties for grade   55S2   ( 55С2 )
T E 10- 5 a 10 6 l r C R 10 9
Grade MPa 1/Grade Watt/(m·Grade) kg/m3 J/(kg·Grade) Ohm·m
20 1.96          


Equivalent steels for grade     55S2   ( 55С2 )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalyBelgiumSpainChinaSwedenBulgariaHungaryPolandRomaniaAustralia
-DIN,WNrJIS AFNORBSEN UNINBNUNEGBSSBDSMSZPNSTASAS
9255
G92550
1.0904
1.5026
55Si7
SUP7
55S7
55Si7RR
56SC7
60Si8
250A53
251A58
55Si
55Si7
55Si7
55Si7
55Si7
56Si7
F.1440
55Si2Mn
2085
2090
55S2
55Si7
55S2
56Si17A
9255
XK9258S

Types of delivery of grade   55S2   ( 55С2 )
В22 - Graded and shaped rolling
B23 - Sheets and Strips
В32 - Graded and shaped rolling
B33 - Sheets and Strips
В72 - Medium-high and high-carbon steel wire


Specification :
Mechanical properties :
sв - Tensile strength , [MPa]
sT - Yield stress, [MPa]
d5 - Specific elongation at fracture , [ % ]
y - Reduction of area , [ % ]
KCU - Impact strength , [ kJ / m2]
HB - Brinell hardness , [MPa]

Physical properties :
T - Test temperature , [Grade]
E - Young modulus , [MPa]
a - Coefficient of linear expansion (range 20o - T ) , [1/Grade]
l - Termal (heat) condition coefficient , [Watt/(m·Grade)]
r - Density , [kg/m3]
C - Specific heat ( range 20o - T ), [J/(kg·Grade)]
R - Electrical resistance , [Ohm·m]

Weldability :
without limitations - welding is done without heating and subsequent heat treeting
limited weldability - welding is possible under heating up to 100-120 grade and subsequent heat treeting
hard weldability - obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing

  55S2   ( 55С2 ) - Spring structural steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys

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