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Metals -> High-temperature or heat-resistant steel and alloy -> Low alloy high-temperature steel

Characteristics of the material 12MKH   ( 12MH,   12 ).

Material : 12MKH   ( 12MH,   12 )
Classification : Low alloy high-temperature steel


Chemical composition in % of the material 12MKH   ( 12MH,   12 ) .
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 of the grade 12MKH   ( 12MH,   12 ).
Ac1 = 723 ,      Ac3(Acm) = 885 ,       Ar3(Arcm) = 803 ,       Ar1 = 715


Mechanical properties under =20o of the material 12MKH   ( 12MH,   12 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar 90   410 235 21 45590Normalizing 910 - 930oC, air, Drawing 670 - 690oC,


    Brinell hardness of the material   12MKH   ( 12MH,   12 )   (heat treatment) ,       HB 10 -1= 156   MPa
    Brinell hardness of the material   12MKH   ( 12MH,   12 )   (quenching, tempering) ,       HB 10 -1= 182   MPa
    Brinell hardness of the material   12MKH   ( 12MH,   12 )   (hot-rolled, annealing) ,       HB 10 -1= 217   MPa


Physical properties of the material 12MKH   ( 12MH,   12 ) .
T E 10- 5 a 10 6 l r C R 10 9
Grade MPa 1/Grade Watt/(mGrade) kg/m3 J/(kgGrade) Ohmm
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


Technological properties of the material 12MKH   ( 12MH,   12 ) .
  Weldability: without limitations.
 Flakes : predisposed
Temper brittleness: not predisposed



Specification :
Mechanical properties :
s - 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/(mGrade)]
r - Density , [kg/m3]
C - Specific heat ( range 20o - T ), [J/(kgGrade)]
R - Electrical resistance , [Ohmm]

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

Database of steels and alloys (Marochnik) contains information about chemical composition and properties of 1500 steels and alloys (stainless steel, alloy steel, carbone steel, structural steel, tool steel, cast iron, aluminum alloy, titanium alloy, copper alloy, nickel alloy, magnesium alloy and others).
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