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Characteristics for grade     30KhMА   ( 30ХМА )

      Grade :     30KhMА   ( 30ХМА )
      Classification :   Relaxation-resistant steel
      Equivalent grades:   Go here




Chemical composition in % for grade   30KhMА   ( 30ХМА )
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 for grade   30KhMА   ( 30ХМА ).
Ac1 = 757 ,      Ac3(Acm) = 807


Mechanical properties under Т=20oС for grade   30KhMА   ( 30ХМА )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Pipe, GOST 8731-87     588 392 13    
Bar, GOST 4543-71 Ø 15   930 735 12 50880Guenching 880oC, oil, Drawing 540oC, water,


    Brinell hardness for     30KhMА   ( 30ХМА )   (annealing) ,       GOST 4543-71 HB 10 -1 = 229   MPa
    Brinell hardness for     30KhMА   ( 30ХМА )   ,     Bar GOST 10702-78 HB 10 -1 = 217   MPa


Technological properties for grade   30KhMА   ( 30ХМА )
  Weldability: limited weldability.
 Flakes : predisposed
Temper brittleness: not predisposed


Physical properties for grade   30KhMА   ( 30ХМА )
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



Equivalent steels for grade     30KhMА   ( 30ХМА )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalySwedenAustria
-DIN,WNrJIS AFNORBSEN UNISSONORM
4130
4130H
G41300
G41350
H41300
H41350
25CrMo4
26CrMo4
34CrMo4
GS-25CrMo4
GS-26CrMo4
GS-34CrMo4
SCM420
SCM430
SCM432
25CD4
25CrMo4
34CD4
34CD4FF
34CrMo4
34CrMo4RR
25CrMo4
1.7218
1.7220
25CrMo4
34CrMo4
25CrMo4
30CrMo4
34CrMo4
35CrMo4
2225
2233
2234
BOHLERV330
BOHLERV340


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

  30KhMА   ( 30ХМА ) - Relaxation-resistant steel: 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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