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Characteristics for grade     65   ( 65 )

      Grade :     65   ( 65 )
      Substitute:   60, 70
      Classification :   Spring structural steel
      Equivalent grades:   Go here



Chemical composition in % for grade   65   ( 65 )
C Si Mn Ni S P Cr Cu
0.62 - 0.70.17 - 0.370.5 - 0.8max   0.25max   0.035max   0.035max   0.25max   0.2


Temperature of critical points for grade   65   ( 65 ).
Ac1 = 727 ,      Ac3(Acm) = 752 ,       Ar3(Arcm) = 730 ,       Ar1 = 696 ,       Mn = 285


Mechanical properties under Т=20oС for grade   65   ( 65 )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Rolled stock, GOST 14959-79     980 785 10 35 Guenching 830oC, oil, Drawing 470oC,
Band annealed , GOST 2284-79     440-740  10    
Band cold-worked , GOST 2284-79     740-1130       


    Brinell hardness for     65   ( 65 )   (without heat treatment) ,       GOST 14959 HB 10 -1 = 255   MPa
    Brinell hardness for     65   ( 65 )   ,     Sheet trick GOST 1577-93 HB 10 -1 = 229   MPa


Technological properties for grade   65   ( 65 )
  Weldability: is not used.
Temper brittleness: not predisposed


Physical properties for grade   65   ( 65 )
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 2.05     7810    
100   11 68   483  
200   11.6 53      
300   12.3        
400   13.2 36   525  
500   13.8 31      
600   14.2        
700   14.6        
800   14.7        
900   13.9        
1000   14.8        
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     65   ( 65 )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalyChinaBulgariaPolandRomaniaCzechia
-DIN,WNrJIS AFNORBSEN UNIGBBDSPNSTASCSN
1064
1065
G10640
G10650
G10690
G10700
Gr.1070
C60E
C65S1
C66D
C67
Ck67
S58C
SUP2
C68
FMR66
FMR68
060A67
080A67
1.0612
1CS67
C66D
3CD65
C67
65
65
65
D65
OLC65A
12071


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

  65   ( 65 ) - 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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