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Characteristics for grade     18KH12VMBFR   ( 18Х12ВМБФР )

      Grade :   18KH12VMBFR   ( 18Х12ВМБФР ) (   2Х12ВМБФР     ЭИ993   )
      Classification :   High alloy high-temperature steel
      Equivalent grades:     Is absent



Chemical composition in % for grade   18KH12VMBFR   ( 18Х12ВМБФР )
C Si Mn Ni S P Cr Mo W V Nb B
0.15 - 0.22max   0.5max   0.5max   0.06max   0.025max   0.0311 - 130.4 - 0.60.4 - 0.70.15 - 0.180.2 - 0.4max   0.003


Temperature of critical points for grade   18KH12VMBFR   ( 18Х12ВМБФР ).
Ac1 = 850 ,      Ac3(Acm) = 930


Mechanical properties under Т=20oС for grade   18KH12VMBFR   ( 18Х12ВМБФР )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Pipe Ø 30 x 6 dihedral 820 640 17 56900Normalizing 1050oC,Cooling air, Drawing 750oC, 3h,Cooling air,
Pipe Ø 219 x 27 dihedral 750 590 15 43400Normalizing 1050oC,Cooling air, Drawing 750oC, 3h,Cooling air,
Bar, GOST 5949-75 Ø 60   740 490 12 45390Guenching and drawing


    Brinell hardness for     18KH12VMBFR   ( 18Х12ВМБФР )   (annealing) ,     Bar GOST 5949-75 HB 10 -1 = 229   MPa


Technological properties for grade   18KH12VMBFR   ( 18Х12ВМБФР )
  Weldability: is not used.


Physical properties for grade   18KH12VMBFR   ( 18Х12ВМБФР )
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 2.28   27.6 7850    
100   11.15 21.8      
200 2.15 11.13 24      
300 2.09 11.42 25.1      
400 1.95 11.8 26.3      
500 1.88 12 27.2      
600 1.73 12.5 28      
700 1.55 12.65 28.9      
800   11.6        
T E 10- 5 a 10 6 l r C R 10 9


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

  18KH12VMBFR   ( 18Х12ВМБФР ) - High alloy high-temperature 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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