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Metals -> Structural steel -> Spring structural steel

Characteristics of the material 70S3   ( 70S3,   703 ).

Material : 70S3   ( 70S3,   703 )
Classification : Spring structural steel


Chemical composition in % of the material 70S3   ( 70S3,   703 ) .
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 of the grade 70S3   ( 70S3,   703 ).
Ac1 = 765 ,      Ac3(Acm) = 780 ,       Mn = 270


Mechanical properties under =20o of the material 70S3   ( 70S3,   703 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
      1670 1470 6 25 Guenching 850oC, oil, Drawing 470oC,


    Brinell hardness of the material   70S3   ( 70S3,   703 )   (annealing) ,       HB 10 -1= 269   MPa
    Brinell hardness of the material   70S3   ( 70S3,   703 )   (without heat treatment) ,       HB 10 -1= 302   MPa


Physical properties of the material 70S3   ( 70S3,   703 ) .
T E 10- 5 a 10 6 l r C R 10 9
Grade MPa 1/Grade Watt/(mGrade) kg/m3 J/(kgGrade) Ohmm
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


Technological properties of the material 70S3   ( 70S3,   703 ) .
  Weldability: is not used.
 Flakes : not predisposed
Temper brittleness: weakly predisposed



Specification :
Mechanical properties :
s - 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/(mGrade)]
r - Density , [kg/m3]
C - Specific heat ( range 20o - T ), [J/(kgGrade)]
R - Electrical resistance , [Ohmm]

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

Database of steels and alloys (Marochnik) contains information about chemical composition and properties of 1500 steels and alloys (stainless steel, alloy steel, carbone steel, structural steel, tool steel, cast iron, aluminum alloy, titanium alloy, copper alloy, nickel alloy, magnesium alloy and others).
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