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Characteristics for grade     70S3А   ( 70С3А )

      Grade :     70S3А   ( 70С3А )
      Classification :   Spring structural steel
      Equivalent grades:   Go here



Chemical composition in % for grade   70S3А   ( 70С3А )
C Si Mn Ni S P Cr Cu
0.66 - 0.742.4 - 2.80.6 - 0.9max   0.25max   0.025max   0.025max   0.3max   0.2


Temperature of critical points for grade   70S3А   ( 70С3А ).
Ac1 = 765 ,      Ac3(Acm) = 780 ,       Mn = 270


Mechanical properties under Т=20oС for grade   70S3А   ( 70С3А )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Rolled stock, GOST 14959-79     1670 1470 6 25 Guenching 850oC, oil, Drawing 470oC,


    Brinell hardness for     70S3А   ( 70С3А )   (annealing) ,       GOST 14959-79 HB 10 -1 = 269   MPa
    Brinell hardness for     70S3А   ( 70С3А )   (without heat treatment) ,       GOST 14959 HB 10 -1 = 302   MPa


Technological properties for grade   70S3А   ( 70С3А )
  Weldability: is not used.
 Flakes : not predisposed
Temper brittleness: weakly predisposed


Physical properties for grade   70S3А   ( 70С3А )
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 2.14   25      
100 2.08 11.4 26   480  
200 1.98 12.3 27   510  
300 1.92 12.8 28   520  
400 1.85 13.3 29   535  
500 1.8 13.7 29   565  
600 1.52 14.1 29   585  
700 1.39 14.3 28   620  
800 1.32 12.8 27   700  
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     70S3А   ( 70С3А )
Warning! Indicated both exact and nearest equivalents.
Bulgaria
BDS
70S3A


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

  70S3А   ( 70С3А ) - 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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