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Metals -> Structural steel -> Spring structural steel

Characteristics of the material 50KHF   ( 50HF,   50 ).

Material : 50KHF   ( 50HF,   50 )
Substitute: 602, 50, 9
Classification : Spring structural steel


Chemical composition in % of the material 50KHF   ( 50HF,   50 ) .
C Si Mn Ni S P Cr V Cu
0.46 - 0.540.17 - 0.370.5 - 0.8max   0.25max   0.025max   0.0250.8 - 1.10.1 - 0.2max   0.2


Temperature of critical points of the grade 50KHF   ( 50HF,   50 ).
Ac1 = 752 ,      Ac3(Acm) = 788 ,       Ar3(Arcm) = 746 ,       Ar1 = 688 ,       Mn = 300


Mechanical properties under =20o of the material 50KHF   ( 50HF,   50 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Forging 100 - 300   835 685 12 38490Guenching and drawing
      1300 1100 8 35 Guenching 850oC, oil, Drawing 520oC,
Band annealed     900   8    


    Brinell hardness of the material   50KHF   ( 50HF,   50 )   (quenching, tempering) ,       HB 10 -1= 262 - 311   MPa


Physical properties of the material 50KHF   ( 50HF,   50 ) .
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 2.18   40 7800   320
100 2.15 11.7 39 7780 490  
200 2.1 12.2 38 7750 505  
300 2 12.9 37 7720 510  
400 1.88 13.5 36 7680 530  
500 1.78 14 33 7650 560  
600 1.6 14.4 31 7610 580  
700 1.42 14.6 29   620  
800 1.32 13.1 28   700  
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 50KHF   ( 50HF,   50 ) .
  Weldability: is not used.
 Flakes : not predisposed
Temper brittleness: weakly 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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