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Metals -> Tool steel -> Carbon tool steel

Characteristics of the material U8   ( U8,   8 ).

Material : U8   ( U8,   8 )
Substitute: 7, 10
Classification : Carbon tool steel


Chemical composition in % of the material U8   ( U8,   8 ) .
C Si Mn Ni S P Cr Cu
0.76 - 0.830.17 - 0.330.17 - 0.33max   0.25max   0.028max   0.03max   0.2max   0.25


Temperature of critical points of the grade U8   ( U8,   8 ).
Ac1 = 720 ,       Ar1 = 700 ,       Mn = 245


Mechanical properties under =20o of the material U8   ( U8,   8 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Blank 6   1420 1230 10 37 Guenching 780oC, oil, Drawing 400oC,
Band annealed 1.5   750   10    


    Brinell hardness of the material   U8   ( U8,   8 )   (annealing) ,       HB 10 -1= 187   MPa


Physical properties of the material U8   ( U8,   8 ) .
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 2.09     7839    
100 2.05 11.4 49 7817 477 230
200 1.99 12.2 46 7786 511 305
300 1.92 13 42 7752 528 395
400 1.85 13.7 38 7714 548 491
500 1.75 14.3 35 7676 565 625
600 1.66 14.8 33 7638 594 769
700   15.2 30 7600 624 931
800   14.5 24 7852 724 1129
900           1165
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material U8   ( U8,   8 ) .
  Weldability: is not used.
 Flakes : not 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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