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Metals -> High-temperature or heat-resistant steel and alloy -> Relaxation-resistant steel

Characteristics of the material 25KH1MF   ( 25H1MF,   251 ).

Material : 25KH1MF   ( 25H1MF,   251 )
Classification : Relaxation-resistant steel


Chemical composition in % of the material 25KH1MF   ( 25H1MF,   251 ) .
C Si Mn Ni S P Cr Mo V Cu
0.22 - 0.290.17 - 0.370.4 - 0.7max   0.25max   0.025max   0.031.5 - 1.80.25 - 0.350.15 - 0.3max   0.2


Temperature of critical points of the grade 25KH1MF   ( 25H1MF,   251 ).
Ac1 = 760 ,      Ac3(Acm) = 840 ,       Ar3(Arcm) = 760 - 780 ,       Ar1 = 680 - 690


Mechanical properties under =20o of the material 25KH1MF   ( 25H1MF,   251 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Blank 25 longitudinal 900 750 14 50600Guenching 880 - 900oC, oil, Drawing 640 - 660oC,Cooling air,
Blank   longitudinal 800 680 16 50600Guenching 930 - 950oC, oil, Drawing 620 - 660oC,


    Brinell hardness of the material   25KH1MF   ( 25H1MF,   251 )   (quenching, tempering) ,       HB 10 -1= 241 - 321   MPa
    Brinell hardness of the material   25KH1MF   ( 25H1MF,   251 )   (hot-rolled, annealing) ,       HB 10 -1= 229   MPa


Physical properties of the material 25KH1MF   ( 25H1MF,   251 ) .
T E 10- 5 a 10 6 l r C R 10 9
Grade MPa 1/Grade Watt/(mGrade) kg/m3 J/(kgGrade) Ohmm
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,   251 ) .
  Weldability: hard weldability.
 Flakes : predisposed
Temper brittleness: not predisposed



Specification :
Mechanical properties :
s - Tensile strength , [MPa]
sT - Yield stress, [MPa]
d5 - 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/(mGrade)]
r - Density , [kg/m3]
C - Specific heat ( range 20o - T ), [J/(kgGrade)]
R - Electrical resistance , [Ohmm]

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

Database of steels and alloys (Marochnik) contains information about chemical composition and properties of 1500 steels and alloys (stainless steel, alloy steel, carbone steel, structural steel, tool steel, cast iron, aluminum alloy, titanium alloy, copper alloy, nickel alloy, magnesium alloy and others).
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