Metals -> High-temperature or heat-resistant steel and alloy -> Relaxation-resistant steel Characteristics of the material 25KH1MF ( 25H1MF, 25Õ1ÌÔ ).
Material : 25KH1MF ( 25H1MF, 25Õ1ÌÔ ) Classification : Relaxation-resistant steel
Chemical composition in % of the material 25KH1MF ( 25H1MF, 25Õ1ÌÔ ) . 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 1.5 - 1.8 0.25 - 0.35 0.15 - 0.3 max 0.2
Temperature of critical points of the grade 25KH1MF ( 25H1MF, 25Õ1ÌÔ ).
Ac1 = 760 , Ac3 (Acm ) = 840 , Ar3 (Arcm ) = 760 - 780 , Ar1 = 680 - 690
Mechanical properties under Ò=20o Ñ of the material 25KH1MF ( 25H1MF, 25Õ1ÌÔ ) .
Assortment
Dimension
Direct.
s â
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - Blank 25 longitudinal 900 750 14 50 600 Guenching 880 - 900o C, oil, Drawing 640 - 660o C,Cooling air, Blank longitudinal 800 680 16 50 600 Guenching 930 - 950o C, oil, Drawing 620 - 660o C,
Brinell hardness of the material 25KH1MF ( 25H1MF, 25Õ1ÌÔ ) (quenching, tempering) , HB 10 -1 = 241 - 321 MPa Brinell hardness of the material 25KH1MF ( 25H1MF, 25Õ1ÌÔ ) (hot-rolled, annealing) , HB 10 -1 = 229 MPa
Physical properties of the material 25KH1MF ( 25H1MF, 25Õ1ÌÔ ) . 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 2.17 7840 100 2.11 11.3 39.8 462 312 200 2.06 11.7 37.9 7790 396 300 1.98 12.8 36.9 475 400 1.91 13.9 35.9 7720 574 500 1.8 14.2 34.8 680 600 1.67 14.4 7650 826 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 25KH1MF ( 25H1MF, 25Õ1ÌÔ ) . Weldability: hard weldability. 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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