Metals -> Structural steel -> High quality structural carbon steel Characteristics of the material 45 ( 45, 45 ).
Material : 45 ( 45, 45 ) Substitute: 40Х, 50, 50Г2 Classification : High quality structural carbon steel
Chemical composition in % of the material 45 ( 45, 45 ) . C Si Mn Ni S P Cr Cu As 0.42 - 0.5 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 45 ( 45, 45 ).
Ac1 = 730 , Ac3 (Acm ) = 755 , Ar3 (Arcm ) = 690 , Ar1 = 780 , Mn = 350
Mechanical properties under Т=20o С of the material 45 ( 45, 45 ) .
Assortment Dimension Direct. s в s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Sheet hotrolled 80 590 18 As-delivered state Strip hotrolled 6 - 25 600 16 40 As-delivered state Forging 100 - 300 470 245 19 42 390 Normalizing Forging 300 - 500 470 245 17 35 340 Normalizing Forging 500 - 800 470 245 15 30 340 Normalizing
Brinell hardness of the material 45 ( 45, 45 ) (hot-rolled, annealing) , HB 10 -1 = 170 MPa Brinell hardness of the material 45 ( 45, 45 ) (cold-drawn, cold-worked) , HB 10 -1 = 207 MPa
Physical properties of the material 45 ( 45, 45 ) . 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 7826 100 2.01 11.9 48 7799 473 200 1.93 12.7 47 7769 494 300 1.9 13.4 44 7735 515 400 1.72 14.1 41 7698 536 500 14.6 39 7662 583 600 14.9 36 7625 578 700 15.2 31 7587 611 800 27 7595 720 900 26 708 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 45 ( 45, 45 ) . Weldability: hard weldability. 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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