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Characteristics for grade     70   ( 70 )

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



Chemical composition in % for grade   70   ( 70 )
C Si Mn Ni S P Cr Cu
0.67 - 0.750.17 - 0.370.5 - 0.8max   0.25max   0.035max   0.035max   0.25max   0.2


Temperature of critical points for grade   70   ( 70 ).
Ac1 = 730 ,      Ac3(Acm) = 743 ,       Ar3(Arcm) = 727 ,       Ar1 = 693


Mechanical properties under Т=20oС for grade   70   ( 70 )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar, GOST 14959-79 to Ø 80   1030 834 9 30 Guenching 830oC, oil, Drawing 470oC,
Band cold-worked , GOST 2284-79     740-1130       
Band annealed , GOST 2284-79     440-740  10    


    Brinell hardness for     70   ( 70 )   (without heat treatment) ,       GOST 14959 HB 10 -1 = 269   MPa
    Brinell hardness for     70   ( 70 )   (annealing) ,     Sheet trick GOST 1577-93 HB 10 -1 = 229   MPa


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


Physical properties for grade   70   ( 70 )
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 2.06     7810    
100   11.5 68   483  
200   12.3 52   487  
300   13 37      
400   13.8 29   521  
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     70   ( 70 )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalyChinaSwedenBulgariaPolandRomaniaCzechiaAustralia
-DIN,WNrJIS AFNORBSEN UNIGBSSBDSPNSTASCSNAS
1065
1069
1070
G10690
G10700
1.1231
C67
C70D
Cf70
Ck67
Ck68
S70C-CSP
C68RR
FMR70
FMR72
XC68
060A67
070A72
CS70
1.0615
2CS67
C67
C70D
C70
65
70
1770
70
D70
OLC66S
OLC70A
12071
1070
K1070S


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

  70   ( 70 ) - 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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