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Characteristics for grade     20Kh3MVF   ( 20Х3МВФ )

      Grade :   20Kh3MVF   ( 20Х3МВФ ) (   ЭИ415     ЭИ579   )
      Classification :   Relaxation-resistant steel
      Equivalent grades:     Is absent




Chemical composition in % for grade   20Kh3MVF   ( 20Х3МВФ )
C Si Mn Ni S P Cr Mo W V Cu
0.15 - 0.230.17 - 0.370.25 - 0.5max   0.3max   0.025max   0.032.8 - 3.30.35 - 0.550.3 - 0.50.6 - 0.85max   0.2


Temperature of critical points for grade   20Kh3MVF   ( 20Х3МВФ ).
Ac1 = 800 - 830 ,      Ac3(Acm) = 900 - 950 ,       Ar3(Arcm) = 790 - 800 ,       Ar1 = 680 - 700


Mechanical properties under Т=20oС for grade   20Kh3MVF   ( 20Х3МВФ )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar, band, GOST 20072-74   longitudinal 880 735 12 40590Guenching 1030 - 1060oC, oil, Drawing 660 - 700oC,
Arbor, rotor   longitudinal 750 650 13 40500Guenching 1030 - 1060oC, oil, Drawing 660 - 700oC,
Arbor, rotor   tangent 730 620 11 32400Guenching 1030 - 1060oC, oil, Drawing 660 - 700oC,


    Brinell hardness for     20Kh3MVF   ( 20Х3МВФ )   (hot-rolled, annealing) ,       GOST 20072-74 HB 10 -1 = 269   MPa


Technological properties for grade   20Kh3MVF   ( 20Х3МВФ )
  Weldability: limited weldability.


Physical properties for grade   20Kh3MVF   ( 20Х3МВФ )
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 2.07   38.5 7800    
100 2.04 10.6 35.6   502 398
200 2 11.5 33.1   560 465
300 1.93 11.8 31.4   610 544
400 1.86 12.1 30.6 7690 650 640
500 1.82 12.6 29.7 7660 710 743
600 1.77 13 29.3 7620 750 859
700 1.71   28.9     982
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

  20Kh3MVF   ( 20Х3МВФ ) - Relaxation-resistant 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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