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Characteristics of the material 30KH   ( 30H,   30 ).

Material : 30KH   ( 30H,   30 )
Substitute: 30, 35, 35
Classification : Alloy structurall steel


Chemical composition in % of the material 30KH   ( 30H,   30 ) .
C Si Mn Ni S P Cr Cu
0.24 - 0.320.17 - 0.370.5 - 0.8max   0.3max   0.035max   0.0350.8 - 1.1max   0.3


Temperature of critical points of the grade 30KH   ( 30H,   30 ).
Ac1 = 740 ,      Ac3(Acm) = 815 ,       Ar1 = 670


Mechanical properties under =20o of the material 30KH   ( 30H,   30 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
      900 700 12 45700 
Bar 40   850 670 17 651000Guenching 850 - 870oC, oil, Drawing 500 - 600oC, air,


    Brinell hardness of the material   30KH   ( 30H,   30 )   (annealing) ,       HB 10 -1= 187   MPa
    Brinell hardness of the material   30KH   ( 30H,   30 )   (cold-drawn, cold-worked) ,       HB 10 -1= 207   MPa


Physical properties of the material 30KH   ( 30H,   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   210
100 2.11 12.4 46.5 7800 482 259
200   12.9 44.4 7770 496 330
300 1.97 13.3 42.3 7740 513 417
400   13.8 38.5 7700 532 517
500 1.75 14.1 35.6 7670 555 636
600   14.5 31.9 7630 583 778
700   14.8 28.8 7590 620 934
800     26 7610 703 1106
900     26.7 7560 687 1146
1100       7470 670 1205
1200       7430 670 1230
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 30KH   ( 30H,   30 ) .
  Weldability: limited weldability.
 Flakes : predisposed
Temper brittleness: 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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