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Characteristics for grade     55   ( 55 )

      Grade :     55   ( 55 )
      Substitute:   50, 60, 50Г
      Classification :   High quality structural carbon steel
      Equivalent grades:   Go here



Chemical composition in % for grade   55   ( 55 )
C Si Mn Ni S P Cr Cu As
0.52 - 0.60.17 - 0.370.5 - 0.8max   0.3max   0.04max   0.035max   0.25max   0.3max   0.08


Temperature of critical points for grade   55   ( 55 ).
Ac1 = 725 ,      Ac3(Acm) = 755 ,       Ar3(Arcm) = 750 ,       Ar1 = 690 ,       Mn = 320


Mechanical properties under Т=20oС for grade   55   ( 55 )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Rolled stock, GOST 1050-88 to 80   650 380 13 35 Normalizing
Band annealed , GOST 2284-79     440-740  13    
Band cold-worked , GOST 2284-79     740-1080       


    Brinell hardness for     55   ( 55 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 255   MPa
    Brinell hardness for     55   ( 55 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 269   MPa
    Brinell hardness for     55   ( 55 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 229   MPa
    Brinell hardness for     55   ( 55 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 217   MPa


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


Physical properties for grade   55   ( 55 )
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 2.1     7280    
100   11 68   479  
200   11.9 55   487  
300   12.7        
400   13.4 36   525  
500   14 32   571  
600   14.5        
700   14.8        
800   12.5        
900   13.5        
1000   14.4        
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     55   ( 55 )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalyBelgiumSpainChinaSwedenBulgariaHungaryPolandRomaniaCzechiaAustraliaSouth Korea
-DIN,WNrJIS AFNORBSEN UNINBNUNEGBSSBDSMSZPNSTASCSNASKS
1055
G10550
1.0535
1.1203
1214
C55
C55E
Ck55
S55C
S55C-CSP
1C55
2C55
AF70
AF70
C50RR
C54
C55
C55E
XC54
XC55
XC55H1
060A57
070M55
080A52
C55
C55E
En9
1.0535
1.1203
1CS55
2C55
2CS55
C55
C55E
1C55
C55
C55E
C55R
C55-1
C55-2
C55
C55E
C55k
F.1150
55
SM55
ZG340-640
1655
55
C55
C55E
C55E
55
55A
55rs
OLC55
OLC55A
OLC55X
12060
1055
SM55C


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

  55   ( 55 ) - High quality structural carbon 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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