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Characteristics for grade     12MKh   ( 12МХ )

      Grade :     12MKh   ( 12МХ )
      Classification :   Low alloy high-temperature steel
      Equivalent grades:   Go here




Chemical composition in % for grade   12MKh   ( 12МХ )
C Si Mn Ni S P Cr Mo W V Ti Cu
0.09 - 0.160.17 - 0.370.4 - 0.7max   0.3max   0.025max   0.030.4 - 0.70.4 - 0.6max   0.2max   0.05max   0.03max   0.2


Temperature of critical points for grade   12MKh   ( 12МХ ).
Ac1 = 723 ,      Ac3(Acm) = 885 ,       Ar3(Arcm) = 803 ,       Ar1 = 715


Mechanical properties under Т=20oС for grade   12MKh   ( 12МХ )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Pipe hot strain, GOST 550-75     412 245 21 45690 
Bar, GOST 20072-74 Ø 90   410 235 21 45590Normalizing 910 - 930oC, air, Drawing 670 - 690oC,


    Brinell hardness for     12MKh   ( 12МХ )   (quenching, tempering) ,       HB 10 -1 = 182   MPa
    Brinell hardness for     12MKh   ( 12МХ )   (hot-rolled, annealing) ,       GOST 20072-74 HB 10 -1 = 217   MPa
    Brinell hardness for     12MKh   ( 12МХ )   ,     Pipe GOST 550-75 HB 10 -1 = 156   MPa


Technological properties for grade   12MKh   ( 12МХ )
  Weldability: without limitations.
 Flakes : predisposed
Temper brittleness: not predisposed


Physical properties for grade   12MKh   ( 12МХ )
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 2.12     7850    
100 2.06 11.2 50 7830 473 240
200 2 12.5 50 7800 519 330
300 1.95 12.7 50 7760 565 410
400 1.89 12.9 49 7730 594 540
500 1.79 13.2 47 7690 653 640
600 1.7 13.5 46 7650 733 740
700 1.6 13.8 44 7610 888 900
T E 10- 5 a 10 6 l r C R 10 9



Equivalent steels for grade     12MKh   ( 12МХ )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanSweden
-DIN,WNrJIS AFNORBSEN SS
11562
11564
13CrMo4-4
13CrMo4-5
STPA20
STPA22
13CrMo4-5
15CD3.5
13CrMo4-5
620-440
13CrMo4-5
2216


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

  12MKh   ( 12МХ ) - Low 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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