Metals -> Structural steel -> High quality structural carbon steel Characteristics of the material 55 ( 55, 55 ).
Material : 55 ( 55, 55 ) Substitute: 50, 60, 50Г Classification : High quality structural carbon steel
Chemical composition in % of the material 55 ( 55, 55 ) . C Si Mn Ni S P Cr Cu As 0.52 - 0.6 0.17 - 0.37 0.5 - 0.8 max 0.25 max 0.04 max 0.035 max 0.25 max 0.25 max 0.08
Temperature of critical points of the grade 55 ( 55, 55 ).
Ac1 = 725 , Ac3 (Acm ) = 755 , Ar3 (Arcm ) = 750 , Ar1 = 690 , Mn = 320
Mechanical properties under Т=20o С of the material 55 ( 55, 55 ) .
Assortment Dimension Direct. s в s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Forging 100 - 300 longitudinal 570 315 14 35 340 Normalizing and high drawing Forging to 100 longitudinal 655 490 16 45 590 Guenching and drawing
Brinell hardness of the material 55 ( 55, 55 ) (quenching, tempering) , HB 10 -1 = 212 - 248 MPa Brinell hardness of the material 55 ( 55, 55 ) (normalize) , HB 10 -1 = 167 - 207 MPa
Physical properties of the material 55 ( 55, 55 ) . 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 2.1 7280 100 11 68 479 200 11.9 55 487 300 12.7 400 13.4 36 525 500 14 32 571 600 14.5 700 14.8 800 12.5 900 13.5 1000 14.4 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 55 ( 55, 55 ) . Weldability: is not used. Flakes : weakly predisposed Temper brittleness: not predisposed
Specification :
Mechanical properties : s в - 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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