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Characteristics for grade     А12   ( А12 )

      Grade :     А12   ( А12 )
      Substitute:   А20
      Classification :   Rolled steel of improved and high cutting machinability
      Equivalent grades:   Go here



Chemical composition in % for grade   А12   ( А12 )
C Si Mn S P Cu
0.08 - 0.160.15 - 0.350.7 - 1.10.08 - 0.20.08 - 0.15max   0.25


Temperature of critical points for grade   А12   ( А12 ).
Ac1 = 735 ,      Ac3(Acm) = 866 ,       Ar3(Arcm) = 840 ,       Ar1 = 685


Mechanical properties under Т=20oС for grade   А12   ( А12 )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Rolled stock hotrolled, GOST 1414-75     410   22 34  
Rolled stock, GOST 1414-75     460-510  7    


    Brinell hardness for     А12   ( А12 )   ,     Rolled stock GOST 1414-75 HB 10 -1 = 160   MPa
    Brinell hardness for     А12   ( А12 )   ,     Rolled stock GOST 1414-75 HB 10 -1 = 217   MPa


Technological properties for grade   А12   ( А12 )
  Weldability: is not used.
 Flakes : predisposed
Temper brittleness: not predisposed


Physical properties for grade   А12   ( А12 )
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 1.98     7830    
100 1.83 11.9 78   470  
200   12.5 67      
300 1.66       479  
400   13.6     517  
500   14.2        
600         571  
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     А12   ( А12 )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalySpainChinaSwedenBulgariaPolandRomaniaCzechia
-DIN,WNrJIS AFNORBSEN UNIUNEGBSSBDSPNSTASCSN
1113
1211
1212
B1112
B1113
B1114
G11080
Gr.1108
1.0721
1.0722
10S20
10SPb20
15S20
9S20
SUM21
10F1
10PbF2
210M15
1.0721
10S20
CF10S20
10SPb20
Y12
1912
A10
A12
A11
AUT12
11110


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

  А12   ( А12 ) - Rolled steel of improved and high cutting machinability: 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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