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Characteristics for grade     75   ( 75 )

      Grade :     75   ( 75 )
      Substitute:   70, 80, 85
      Classification :   Spring structural steel
      Equivalent grades:   Go here



Chemical composition in % for grade   75   ( 75 )
C Si Mn Ni S P Cr Cu
0.72 - 0.80.17 - 0.370.5 - 0.8max   0.25max   0.035max   0.035max   0.25max   0.2


Temperature of critical points for grade   75   ( 75 ).
Ac1 = 720 ,      Ac3(Acm) = 735 ,       Ar1 = 700


Mechanical properties under Т=20oС for grade   75   ( 75 )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Rolled stock, GOST 14959-79     1080 885 9 30 Guenching 820oC, oil, Drawing 470oC,


    Brinell hardness for     75   ( 75 )   (without heat treatment) ,     Rolled stock GOST 14959-79 HB 10 -1 = 285   MPa
    Brinell hardness for     75   ( 75 )   (heat treatment) ,     Rolled stock GOST 14959-79 HB 10 -1 = 241   MPa


Technological properties for grade   75   ( 75 )
  Weldability: is not used.
 Flakes : weakly predisposed
Temper brittleness: not predisposed


Physical properties for grade   75   ( 75 )
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 1.91          


Equivalent steels for grade     75   ( 75 )
Warning! Indicated both exact and nearest equivalents.
USAGermanyFranceEnglandEuropeanItalyChinaSwedenBulgariaPolandRomaniaCzechia
-DIN,WNrAFNORBSEN UNIGBSSBDSPNSTASCSN
1074
1075
1078
G10740
G10750
G10780
G10800
1.0605
1.1248
C75
C75-2
C76D
Ck75
C75
C75RR
XC75
060A78
070A72
1449-80HS
80HS
CS80
1.0614
1CS75
2CD75
2CS75
C76D
CS75
3CD75
C75
75
1774
1778
75
75
D75
OLC75A
12081


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

  75   ( 75 ) - 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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