Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 30KHN3À ( 30HN3À, 30ÕÍ3À ).
Material : 30KHN3À ( 30HN3À, 30ÕÍ3À ) Substitute: 30Õ2ÃÍ2, 25Õ2ÃÍÒÀ, 34ÕÍ2Ì Classification : Alloy structurall steel
Chemical composition in % of the material 30KHN3À ( 30HN3À, 30ÕÍ3À ) . C Si Mn Ni S P Cr Cu 0.27 - 0.33 0.17 - 0.37 0.3 - 0.6 2.75 - 3.15 max 0.025 max 0.025 0.6 - 0.9 max 0.3
Temperature of critical points of the grade 30KHN3À ( 30HN3À, 30ÕÍ3À ).
Ac1 = 700 , Ac3 (Acm ) = 800 , Ar3 (Arcm ) = 680 , Ar1 = 610 , Mn = 305
Mechanical properties under Ò=20o Ñ of the material 30KHN3À ( 30HN3À, 30ÕÍ3À ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Bar Æ 5 1670 1420 13 50 660 Guenching 850o C, oil, Drawing 200o C, air, Bar Æ 20 1670 1370 12 45 490 Guenching 850o C, oil, Drawing 200o C, air, Bar Æ 25 980 785 10 50 780 Guenching 820o C, oil, Drawing 530o C, water,
Brinell hardness of the material 30KHN3À ( 30HN3À, 30ÕÍ3À ) (annealing) , HB 10 -1 = 241 MPa
Physical properties of the material 30KHN3À ( 30HN3À, 30ÕÍ3À ) . 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 2.15 34 7850 268 100 2.07 10.8 35 7830 494 317 200 1.95 11.5 36 7800 504 387 300 1.87 12.2 36 7770 518 469 400 1.75 12.8 36 7730 536 567 500 1.71 13.2 35 7700 558 681 600 13.5 31 7670 587 817 700 28 7690 657 981 800 27 7650 703 900 7600 695 1000 687 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 30KHN3À ( 30HN3À, 30ÕÍ3À ) . 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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