Metals -> High-temperature or heat-resistant steel and alloy -> Relaxation-resistant steel Characteristics of the material 25KH2M1F ( 25H2M1F, 25Õ2Ì1Ô ).
Material : 25KH2M1F ( 25H2M1F, 25Õ2Ì1Ô ) Classification : Relaxation-resistant steel
Chemical composition in % of the material 25KH2M1F ( 25H2M1F, 25Õ2Ì1Ô ) . C Si Mn Ni S P Cr Mo V Cu 0.22 - 0.29 0.17 - 0.37 0.4 - 0.7 max 0.25 max 0.025 max 0.03 2.1 - 2.6 0.9 - 1.1 0.3 - 0.5 max 0.2
Temperature of critical points of the grade 25KH2M1F ( 25H2M1F, 25Õ2Ì1Ô ).
Ac1 = 780 , Ac3 (Acm ) = 870 , Ar3 (Arcm ) = 790 , Ar1 = 700
Mechanical properties under Ò=20o Ñ of the material 25KH2M1F ( 25H2M1F, 25Õ2Ì1Ô ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Bar Æ 25 longitudinal 900 750 10 40 300 Normalizing 1030 - 1060o C,Drawing 680 - 720o C, air,
Brinell hardness of the material 25KH2M1F ( 25H2M1F, 25Õ2Ì1Ô ) (quenching, tempering) , HB 10 -1 = 235 - 277 MPa
Physical properties of the material 25KH2M1F ( 25H2M1F, 25Õ2Ì1Ô ) . 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 2.23 7800 270 100 2.18 12.5 32.7 7780 536 360 200 2.13 12.9 31.8 7750 574 420 300 2.07 13.3 30.1 7720 599 500 400 2 13.7 28.5 7680 632 590 500 1.92 14 28.1 7650 674 710 600 1.83 14.7 26.4 7600 733 840 700 1.75 970 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 25KH2M1F ( 25H2M1F, 25Õ2Ì1Ô ) . Weldability: is not used.
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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