Metals -> High-temperature or heat-resistant steel and alloy -> Relaxation-resistant steel Characteristics of the material 38KH2MYUÀ ( 38H2MJUÀ, 38Õ2ÌÞÀ ).
Material : 38KH2MYUÀ ( 38H2MJUÀ, 38Õ2ÌÞÀ ) Substitute: 38Õ2ÞÀ, 38ÕÂÔÞ, 20Õ3ÌÂÔ. 38Õ2Þ Classification : Relaxation-resistant steel
Chemical composition in % of the material 38KH2MYUÀ ( 38H2MJUÀ, 38Õ2ÌÞÀ ) . C Si Mn Ni S P Cr Mo Al Cu 0.35 - 0.42 0.2 - 0.45 0.3 - 0.6 max 0.3 max 0.025 max 0.025 1.35 - 1.65 0.15 - 0.25 0.7 - 1.1 max 0.3
Temperature of critical points of the grade 38KH2MYUÀ ( 38H2MJUÀ, 38Õ2ÌÞÀ ).
Ac1 = 800 , Ac3 (Acm ) = 940 , Ar1 = 730
Mechanical properties under Ò=20o Ñ of the material 38KH2MYUÀ ( 38H2MJUÀ, 38Õ2ÌÞÀ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Bar longitudinal 825 665 16.5 64 1600 Guenching 930 - 940o C, oil, Drawing 660o C, 5h,Cooling air,
Brinell hardness of the material 38KH2MYUÀ ( 38H2MJUÀ, 38Õ2ÌÞÀ ) (annealing) , HB 10 -1 = 229 MPa
Physical properties of the material 38KH2MYUÀ ( 38H2MJUÀ, 38Õ2ÌÞÀ ) . 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 2.09 33 7710 100 2.02 11.5 33 496 200 1.94 11.8 32 517 300 1.9 12.7 31 533 400 1.81 13.4 20 546 500 1.74 13.9 20 575 600 1.62 14.7 28 609 700 1.47 14.9 27 638 800 1.37 27 676 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 38KH2MYUÀ ( 38H2MJUÀ, 38Õ2ÌÞÀ ) . Weldability: is not used. Flakes : predisposed Temper brittleness: not 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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