Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 30KHGS ( 30HGS, 30ÕÃÑ ).
Material : 30KHGS ( 30HGS, 30ÕÃÑ ) Substitute: 40ÕÔÀ, 35ÕÌ, 40ÕÍ, 35ÕÃÑÀ Classification : Alloy structurall steel
Chemical composition in % of the material 30KHGS ( 30HGS, 30ÕÃÑ ) . C Si Mn Ni S P Cr Cu 0.28 - 0.35 0.9 - 1.2 0.8 - 1.1 max 0.3 max 0.035 max 0.035 0.8 - 1.1 max 0.3
Temperature of critical points of the grade 30KHGS ( 30HGS, 30ÕÃÑ ).
Ac1 = 760 , Ac3 (Acm ) = 830 , Ar3 (Arcm ) = 705 , Ar1 = 670 , Mn = 352
Mechanical properties under Ò=20o Ñ of the material 30KHGS ( 30HGS, 30ÕÃÑ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Steel 40 930 820 12 51 690 Guenching 880o C, oil, Drawing 600o C, water, Steel 80 860 730 14 50 780 Guenching 880o C, oil, Drawing 600o C, water, Sheet annealed 500-750 14 Bar Æ 25 1080 835 10 45 440 Guenching 880o C, oil, Drawing 540o C, water,
Brinell hardness of the material 30KHGS ( 30HGS, 30ÕÃÑ ) (annealing) , HB 10 -1 = 229 MPa
Physical properties of the material 30KHGS ( 30HGS, 30ÕÃÑ ) . 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 1.94 7850 210 100 1.85 12 37 7830 493 200 1.73 12.5 41 7800 504 300 1.69 12.9 38 7760 512 400 1.66 13.2 37 7730 533 500 1.56 13.6 36 7700 554 600 13.9 35 7670 584 700 34 622 800 32 693 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 30KHGS ( 30HGS, 30ÕÃÑ ) . Weldability: limited weldability. 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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