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Characteristics of the material 12KH2N4   ( 12H2N4,   1224 ).

Material : 12KH2N4   ( 12H2N4,   1224 )
Substitute: 20, 122, 123, 2024, 20
Classification : Alloy structurall steel


Chemical composition in % of the material 12KH2N4   ( 12H2N4,   1224 ) .
C Si Mn Ni S P Cr Cu
0.09 - 0.150.17 - 0.370.3 - 0.63.25 - 3.65max   0.025max   0.0251.25 - 1.65max   0.3


Temperature of critical points of the grade 12KH2N4   ( 12H2N4,   1224 ).
Ac1 = 745 ,      Ac3(Acm) = 800 ,       Ar3(Arcm) = 675 ,       Ar1 = 625 ,       Mn = 438


Mechanical properties under =20o of the material 12KH2N4   ( 12H2N4,   1224 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar 5   1270 1080 13 601050As-delivered state
Bar 20   980 830 16 701470As-delivered state


    Brinell hardness of the material   12KH2N4   ( 12H2N4,   1224 )   (annealing) ,       HB 10 -1= 269   MPa


Physical properties of the material 12KH2N4   ( 12H2N4,   1224 ) .
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     7840    
100   11 25 7820    
200   12        
300   13   7760    
400   14.7 19 7710    
500   15.3        
600   15.6   7630    
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 12KH2N4   ( 12H2N4,   1224 ) .
  Weldability: limited weldability.
 Flakes : predisposed
Temper brittleness: 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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