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

Characteristics of the material 30KHM   ( 30HM,   30 ).

Material : 30KHM   ( 30HM,   30 )
Substitute: 35, 35
Classification : Relaxation-resistant steel


Chemical composition in % of the material 30KHM   ( 30HM,   30 ) .
C Si Mn Ni S P Cr Mo Cu
0.26 - 0.330.17 - 0.370.4 - 0.7max   0.3max   0.035max   0.0350.8 - 1.10.15 - 0.25max   0.3


Temperature of critical points of the grade 30KHM   ( 30HM,   30 ).
Ac1 = 757 ,      Ac3(Acm) = 807 ,       Ar3(Arcm) = 763 ,       Ar1 = 693


Mechanical properties under =20o of the material 30KHM   ( 30HM,   30 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Forging to 100   550 300 18 45 Annealing 860 - 880oC,
Forging 100 - 150   600 350 16 45400Normalizing 860oC,
Bar     930 735 11 45780Guenching 880oC, oil, Drawing 540oC, water,


    Brinell hardness of the material   30KHM   ( 30HM,   30 )   (annealing) ,       HB 10 -1= 229   MPa


Physical properties of the material 30KHM   ( 30HM,   30 ) .
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 2.08     7820   270
100 2.07 12.3 41.9 7800 462  
200 2.04 12.6 40.7 7770   334
300 1.97 12.9 39.6 7740   425
400 1.88 13.9 38.4 7700   524
500 1.75 14.4   7660   628
600 1.6 14.6       757
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 30KHM   ( 30HM,   30 ) .
  Weldability: limited weldability.
 Flakes : weakly 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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