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Characteristics for grade     30KHN3А   ( 30ХН3А )

      Grade :     30KHN3А   ( 30ХН3А )
      Substitute:   30Х2ГН2, 25Х2ГНТА, 34ХН2М
      Classification :   Alloy structurall steel
      Equivalent grades:   Go here



Chemical composition in % for grade   30KHN3А   ( 30ХН3А )
C Si Mn Ni S P Cr Cu
0.27 - 0.330.17 - 0.370.3 - 0.62.75 - 3.15max   0.025max   0.0250.6 - 0.9max   0.3


Temperature of critical points for grade   30KHN3А   ( 30ХН3А ).
Ac1 = 700 ,      Ac3(Acm) = 800 ,       Ar3(Arcm) = 680 ,       Ar1 = 610 ,       Mn = 305


Mechanical properties under Т=20oС for grade   30KHN3А   ( 30ХН3А )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar Ø 5   1670 1420 13 50660Guenching 850oC, oil, Drawing 200oC, air,
Bar Ø 20   1670 1370 12 45490Guenching 850oC, oil, Drawing 200oC, air,
Bar, GOST 4543-71 Ø 25   980 785 10 50780Guenching 820oC, oil, Drawing 530oC, water,


    Brinell hardness for     30KHN3А   ( 30ХН3А )   (annealing) ,       GOST 4543-71 HB 10 -1 = 241   MPa


Technological properties for grade   30KHN3А   ( 30ХН3А )
  Weldability: limited weldability.
 Flakes : predisposed
Temper brittleness: predisposed


Physical properties for grade   30KHN3А   ( 30ХН3А )
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 2.15   34 7850   268
100 2.07 10.8 35 7830 494 317
200 1.95 11.5 36 7800 504 387
300 1.87 12.2 36 7770 518 469
400 1.75 12.8 36 7730 536 567
500 1.71 13.2 35 7700 558 681
600   13.5 31 7670 587 817
700     28 7690 657 981
800     27 7650 703  
900       7600 695  
1000         687  
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     30KHN3А   ( 30ХН3А )
Warning! Indicated both exact and nearest equivalents.
GermanyJapanFranceBulgariaPolandCzechia
DIN,WNrJIS AFNORBDSPNCSN
1.5755
30NiCr14
31NiCr14
SNC631
SNC836
30NC11
30NC11FF
30NC12
30ChN3A
37HN3A
16440

Types of delivery of grade   30KHN3А   ( 30ХН3А )
В22 - Graded and shaped rolling
B23 - Sheets and Strips
В32 - Graded and shaped rolling


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

  30KHN3А   ( 30ХН3А ) - Alloy structurall 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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