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Characteristics of the material 20KHN4F   ( 20HN4F,   204 ).

Material : 20KHN4F   ( 20HN4F,   204 )
Substitute: 1824
Classification : Alloy structurall steel


Chemical composition in % of the material 20KHN4F   ( 20HN4F,   204 ) .
C Si Mn Ni S P Cr V Cu
0.17 - 0.240.17 - 0.370.25 - 0.553.75 - 4.15max   0.025max   0.0250.7 - 1.10.1 - 0.18max   0.3


Temperature of critical points of the grade 20KHN4F   ( 20HN4F,   204 ).
Ac1 = 710 ,      Ac3(Acm) = 750 ,       Mn = 310


Mechanical properties under =20o of the material 20KHN4F   ( 20HN4F,   204 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar 25   880 685 12 50980Guenching and drawing


    Brinell hardness of the material   20KHN4F   ( 20HN4F,   204 )   (annealing) ,       HB 10 -1= 269   MPa


Physical properties of the material 20KHN4F   ( 20HN4F,   204 ) .
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           360
100   11.7 38     410
200   12.7 38     480
300   13.7 37     560
400     35     640
500     34     720
600   15.4 31      
700     29     1020
800     28     1120
900     27     1180
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 20KHN4F   ( 20HN4F,   204 ) .
  Weldability: is not used.
 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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