Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 12KHN2 ( 12HN2, 12ÕÍ2 ).
Material : 12KHN2 ( 12HN2, 12ÕÍ2 ) Substitute: 20ÕÍÐ, 20ÕÃÍÐ, 12ÕÍ3À, 18ÕÃÒ, 20ÕÃÐ Classification : Alloy structurall steel
Chemical composition in % of the material 12KHN2 ( 12HN2, 12ÕÍ2 ) . C Si Mn Ni S P Cr Cu 0.09 - 0.16 0.17 - 0.37 0.3 - 0.6 1.5 - 1.9 max 0.035 max 0.035 0.6 - 0.9 max 0.3
Temperature of critical points of the grade 12KHN2 ( 12HN2, 12ÕÍ2 ).
Ac1 = 715 , Ac3 (Acm ) = 773 , Ar3 (Arcm ) = 726 , Ar1 = 659 , Mn = 405
Mechanical properties under Ò=20o Ñ of the material 12KHN2 ( 12HN2, 12ÕÍ2 ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Steel 30 Ö 550 420 29 79 3630 Guenching 880o C, oil, Drawing 600o C, water, Steel 30 Ö 550 420 29 79 3630 Guenching 880o C, oil, Drawing 600o C, water, Bar Æ 15 800 600 12 50
Brinell hardness of the material 12KHN2 ( 12HN2, 12ÕÍ2 ) (annealing) , HB 10 -1 = 207 MPa
Physical properties of the material 12KHN2 ( 12HN2, 12ÕÍ2 ) . 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 2.11 38 7880 330 100 2.03 10.5 38 494 360 200 1.96 11.5 37 507 430 300 1.9 11.9 35 523 520 400 1.76 12.4 33 536 590 500 1.72 12.9 31 565 670 600 1.54 13.6 30 586 700 1.41 13.9 29 624 800 1.3 11.7 29 703 1050 900 1120 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 12KHN2 ( 12HN2, 12ÕÍ2 ) . Weldability: limited weldability. Flakes : not 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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