Database of Steel and Alloy (Marochnik)

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

Characteristics of the material 30KHMÀ   ( 30HMÀ,   30ÕÌÀ ).

Material : 30KHMÀ   ( 30HMÀ,   30ÕÌÀ )
Classification : Relaxation-resistant steel


Chemical composition in % of the material 30KHMÀ   ( 30HMÀ,   30ÕÌÀ ) .
C Si Mn Ni S P Cr Mo Cu
0.26 - 0.330.17 - 0.370.4 - 0.7max   0.3max   0.025max   0.0250.8 - 1.10.15 - 0.25max   0.3


Temperature of critical points of the grade 30KHMÀ   ( 30HMÀ,   30ÕÌÀ ).
Ac1 = 757 ,      Ac3(Acm) = 807


Mechanical properties under Ò=20oÑ of the material 30KHMÀ   ( 30HMÀ,   30ÕÌÀ ) .
Assortment Dimension Direct. sâ sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar Æ 15   930 735 12 50880Guenching 880oC, oil, Drawing 540oC, water,


    Brinell hardness of the material   30KHMÀ   ( 30HMÀ,   30ÕÌÀ )   (annealing) ,       HB 10 -1= 229   MPa


Physical properties of the material 30KHMÀ   ( 30HMÀ,   30ÕÌÀ ) .
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 2.08     7820   230
100 2.07 11.6 46 7800 462  
200 2.04 12.5 44 7770    
300 1.97 13.2 42 7740    
400 1.88 13.8 42 7700    
500 1.76 14.3 39 7660    
600 1.6   37      
700     36      
800     32      
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 30KHMÀ   ( 30HMÀ,   30ÕÌÀ ) .
  Weldability: limited weldability.
 Flakes : predisposed
Temper brittleness: not predisposed



Specification :
Mechanical properties :
sâ - 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

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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