Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 50G ( 50G, 50Г ).
Material : 50G ( 50G, 50Г ) Substitute: 40Г, 50 Classification : Alloy structurall steel
Chemical composition in % of the material 50G ( 50G, 50Г ) . C Si Mn Ni S P Cr Cu 0.48 - 0.56 0.17 - 0.37 0.7 - 1 max 0.3 max 0.035 max 0.035 max 0.3 max 0.3
Temperature of critical points of the grade 50G ( 50G, 50Г ).
Ac1 = 723 , Ac3 (Acm ) = 760 , Ar3 (Arcm ) = 740 , Ar1 = 680 , Mn = 320
Mechanical properties under Т=20o С of the material 50G ( 50G, 50Г ) .
Assortment
Dimension
Direct.
s в
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - Bar Ж 30 Ц 800 550 18 55 780 Guenching 840o C, water, Drawing 560 - 580o C, air, Bar Ж 50 Ц 760 490 18 55 680 Guenching 840o C, water, Drawing 560 - 580o C, air, Bar Ж 80 Ц 740 470 18 50 590 Guenching 840o C, water, Drawing 560 - 580o C, air, Band annealed to 1.5 650 15
Brinell hardness of the material 50G ( 50G, 50Г ) (annealing) , HB 10 -1 = 229 MPa
Physical properties of the material 50G ( 50G, 50Г ) . 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 2.16 43 7810 100 2.13 11.8 42 487 200 2.08 12.5 41 500 300 1.99 13.2 38 517 400 1.85 13.8 36 533 500 1.74 14.3 34 559 600 1.6 14.8 31 584 700 1.42 15.1 29 609 800 1.3 12.3 28 676 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 50G ( 50G, 50Г ) . Weldability: hard weldability. Flakes : predisposed Temper brittleness: 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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