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Characteristics for grade     20KHML   ( 20ХМЛ )



      Grade :     20KHML   ( 20ХМЛ )
      Classification :   Casting alloy steel for general purposes
      Equivalent grades:     Is absent



Chemical composition in % for grade   20KHML   ( 20ХМЛ )
C Si Mn S P Cr Mo
0.15 - 0.250.2 - 0.420.4 - 0.9max   0.04max   0.040.4 - 0.70.4 - 0.6


Mechanical properties under Т=20oС for grade   20KHML   ( 20ХМЛ )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Casting, GOST 977-88 to 100   441 245 18 30294Normalizing 880 - 900oC,Drawing 600 - 650oC,


    Brinell hardness for     20KHML   ( 20ХМЛ )   (normalize, tempering) ,       HB 10 -1 = 149 - 229   MPa


Technological properties for grade   20KHML   ( 20ХМЛ )
  Weldability: limited weldability.
Temper brittleness: not predisposed


Technological properties of the material   20KHML   ( 20ХМЛ ) .
        Linear shrinkage : 2.2 - 2.3   %


Heat treatment of the material   20KHML   ( 20ХМЛ )
Normalizing 880 - 890 ° C, Tempering 600 - 650 ° C


Physical properties for grade   20KHML   ( 20ХМЛ )
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       7800    
100   10.9   7780    
200   12.4   7750    
300   12.8   7720    
400   13.1   7690    
500   13.6   7650    
600   13.9   7620    
T E 10- 5 a 10 6 l r C R 10 9



Types of delivery of grade   20KHML   ( 20ХМЛ )
B82 - Steel Castings


Specification :
Mechanical properties :
sв - 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/(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

  20KHML   ( 20ХМЛ ) - Casting alloy steel for general purposes: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys

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