Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 25KHGSÀ ( 25HGSÀ, 25ÕÃÑÀ ).
Material : 25KHGSÀ ( 25HGSÀ, 25ÕÃÑÀ ) Substitute: 20ÕÃÑÀ Classification : Alloy structurall steel
Chemical composition in % of the material 25KHGSÀ ( 25HGSÀ, 25ÕÃÑÀ ) . C Si Mn Ni S P Cr Cu 0.22 - 0.28 0.9 - 1.2 0.8 - 1.1 max 0.3 max 0.025 max 0.025 0.8 - 1.1 max 0.3
Temperature of critical points of the grade 25KHGSÀ ( 25HGSÀ, 25ÕÃÑÀ ).
Ac1 = 755 , Ac3 (Acm ) = 840 , Ar1 = 690
Mechanical properties under Ò=20o Ñ of the material 25KHGSÀ ( 25HGSÀ, 25ÕÃÑÀ ) .
Assortment
Dimension
Direct.
s â
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - Steel 30 Ö 690 520 25 67 1830 Guenching 890o C, oil, Drawing 600o C, water, Steel 80 Ö 630 400 24 67 1860 Guenching 890o C, oil, Drawing 600o C, water, Sheet annealed 500-700 16 Bar Æ 15 1080 835 10 40 590 Guenching 880o C, oil, Drawing 480o C, water,
Brinell hardness of the material 25KHGSÀ ( 25HGSÀ, 25ÕÃÑÀ ) (annealing) , HB 10 -1 = 217 MPa Brinell hardness of the material 25KHGSÀ ( 25HGSÀ, 25ÕÃÑÀ ) (normalize) , HB 10 -1 = 149 - 207 MPa
Physical properties of the material 25KHGSÀ ( 25HGSÀ, 25ÕÃÑÀ ) . 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 2.13 35 7850 306 100 2.06 12.2 36 7830 496 338 200 1.94 13 37 7790 504 415 300 1.87 13.6 37 7760 512 501 400 1.75 14 39 7730 533 573 500 1.68 14.2 34 7690 554 660 600 1.63 14.4 32 7650 584 830 700 1.43 14.5 31 7610 622 1000 800 1.3 12.3 29 693 1100 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 25KHGSÀ ( 25HGSÀ, 25ÕÃÑÀ ) . Weldability: without limitations. Flakes : predisposed Temper brittleness: 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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