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Characteristics for grade     30KhM   ( 30ХМ )

      Grade :     30KhM   ( 30ХМ )
      Substitute:   35ХМ, 35ХРА
      Classification :   Relaxation-resistant steel
      Equivalent grades:   Go here



Chemical composition in % for grade   30KhM   ( 30ХМ )
C Si Mn Ni S P Cr Mo Cu
0.26 - 0.340.17 - 0.370.4 - 0.7max   0.3max   0.035max   0.0350.8 - 1.10.15 - 0.25max   0.3


Temperature of critical points for grade   30KhM   ( 30ХМ ).
Ac1 = 757 ,      Ac3(Acm) = 807 ,       Ar3(Arcm) = 763 ,       Ar1 = 693


Mechanical properties under Т=20oС for grade   30KhM   ( 30ХМ )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar, GOST 4543-71     930 735 11 45780Guenching 880oC, oil, Drawing 540oC, water,
Forging to 100   550 300 18 45 Annealing 860 - 880oC,
Forging 100 - 150   600 350 16 45400Normalizing 860oC,


    Brinell hardness for     30KhM   ( 30ХМ )   (annealing) ,       GOST 4543-71 HB 10 -1 = 229   MPa


Technological properties for grade   30KhM   ( 30ХМ )
  Weldability: limited weldability.
 Flakes : weakly predisposed
Temper brittleness: not predisposed


Physical properties for grade   30KhM   ( 30ХМ )
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   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


Equivalent steels for grade     30KhM   ( 30ХМ )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalySpainChinaSwedenBulgariaHungaryPolandRomaniaCzechiaFinlandAustriaAustraliaSouth Korea
-DIN,WNrJIS AFNORBSEN UNIUNEGBSSBDSMSZPNSTASCSNSFSONORMASKS
4130
G41300
G41350
1.7220
24CrMo5
25CrMo4
26CrMo4
34CrMo4
GS-25CrMo4
GS-26CrMo4
GS-34CrMo4
SCCrM1
SCM2
SCM420
SCM430
SCM432
25CD4
25CD4FF
25CrMo4
30CD4
30CD4FF
34CD4
34CD4FF
34CrMo4
34CrMo4RR
25CrMo4
34CrMo4
708A25
1.7218
1.7220
25CrMo4
34CrMo4
34CrMo4KD
25CrMo4
25CrMo4KB
30CrMo4
34CrMo4
35CrMo4
25CrMo4
AM25CrMo4
AM26CrMo4
F.222
30CrMo
ML30CrMo
ML30CrMoA
2225
2233
25ChML
25CrMo4
30ChM
25CrMo4
25HM
26HM
30HM
L25HM
26MoCr11
33MoCr11
T30CrMo3
15130
15131
G-25CrMo4
BOHLERV330
BOHLERV340
4130
4130H
SCCrM1
SCM420
SCM420TK
SCM430


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

  30KhM   ( 30ХМ ) - 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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