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Metals -> High-temperature or heat-resistant steel and alloy -> Relaxation-resistant steel

Characteristics of the material 20KH3MVF   ( 20H3MVF,   203 ).

Material : 20KH3MVF   ( 20H3MVF,   203 )
Classification : Relaxation-resistant steel


Chemical composition in % of the material 20KH3MVF   ( 20H3MVF,   203 ) .
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 of the grade 20KH3MVF   ( 20H3MVF,   203 ).
Ac1 = 800 - 830 ,      Ac3(Acm) = 900 - 950 ,       Ar3(Arcm) = 790 - 800 ,       Ar1 = 680 - 700


Mechanical properties under =20o of the material 20KH3MVF   ( 20H3MVF,   203 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar, band   longitudinal 900 750 12 40600Guenching 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 of the material   20KH3MVF   ( 20H3MVF,   203 )   (hot-rolled, annealing) ,       HB 10 -1= 269   MPa


Physical properties of the material 20KH3MVF   ( 20H3MVF,   203 ) .
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 2.07   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


Technological properties of the material 20KH3MVF   ( 20H3MVF,   203 ) .
  Weldability: limited weldability.



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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