Metals -> Structural steel -> Spring structural steel Characteristics of the material 50KHFÀ ( 50HFÀ, 50ÕÔÀ ).
Material : 50KHFÀ ( 50HFÀ, 50ÕÔÀ ) Substitute: 60Ñ2À, 50ÕÃÔÀ, 9ÕÑ Classification : Spring structural steel
Chemical composition in % of the material 50KHFÀ ( 50HFÀ, 50ÕÔÀ ) . C Si Mn Ni S P Cr V Cu 0.46 - 0.54 0.17 - 0.37 0.5 - 0.8 max 0.25 max 0.025 max 0.025 0.8 - 1.1 0.1 - 0.2 max 0.2
Temperature of critical points of the grade 50KHFÀ ( 50HFÀ, 50ÕÔÀ ).
Ac1 = 752 , Ac3 (Acm ) = 788 , Ar3 (Arcm ) = 746 , Ar1 = 688 , Mn = 300
Mechanical properties under Ò=20o Ñ of the material 50KHFÀ ( 50HFÀ, 50ÕÔÀ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Forging 100 - 300 835 685 12 38 490 Guenching and drawing 1300 1100 8 35 Guenching 850o C, oil, Drawing 520o C, Band annealed 900 8
Brinell hardness of the material 50KHFÀ ( 50HFÀ, 50ÕÔÀ ) (quenching, tempering) , HB 10 -1 = 262 - 311 MPa
Physical properties of the material 50KHFÀ ( 50HFÀ, 50ÕÔÀ ) . 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 2.18 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 50KHFÀ ( 50HFÀ, 50ÕÔÀ ) . Weldability: is not used. Flakes : not predisposed Temper brittleness: weakly predisposed
Specification :
Mechanical properties : s â - Tensile strength , [MPa] s T - Yield stress, [MPa] d 5 - 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
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