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Characteristics for grade     30KH   ( 30Х )

      Grade :     30KH   ( 30Х )
      Substitute:   30ХРА, 35Х, 35ХРА
      Classification :   Alloy structurall steel
      Equivalent grades:   Go here
Grade   30KH   ( 30Х ):   supplier   Auremo   www.auremo.biz
Sale:   Russia +7 (812) 680-16-77 ,   Germany +49 (208) 205-83-073,     info [a] auremo.org



Chemical composition in % for grade   30KH   ( 30Х )
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 for grade   30KH   ( 30Х ).
Ac1 = 740 ,      Ac3(Acm) = 815 ,       Ar1 = 670


Mechanical properties under Т=20oС for grade   30KH   ( 30Х )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
 , GOST 4543-71     880 685 12 45690Guenching and drawing


    Brinell hardness for     30KH   ( 30Х )   (annealing) ,       GOST 4543-71 HB 10 -1 = 187   MPa
    Brinell hardness for     30KH   ( 30Х )   (cold-worked) ,       GOST 4543-71 HB 10 -1 = 241   MPa
    Brinell hardness for     30KH   ( 30Х )   ,     Bar GOST 10702-78 HB 10 -1 = 170   MPa


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


Physical properties for grade   30KH   ( 30Х )
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   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


Equivalent steels for grade     30KH   ( 30Х )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalySpainChinaBulgariaPoland
-DIN,WNrJIS AFNORBSEN UNIUNEGBBDSPN
5130
5130H
5130RH
G51300
1.7030
28Cr4
34Cr4
SCr2
SCr430
SCr430H
28C4
32C4
32C4FF
34Cr4
28Cr4
530A30
1.7030
1.7033
28Cr4
34Cr4
34Cr4
28Cr4
30Cr
30Ch
30H

Types of delivery of grade   30KH   ( 30Х )
В22 - Graded and shaped rolling
B23 - Sheets and Strips
В32 - Graded and shaped rolling
B33 - Sheets and Strips
В71 - Low-carbon steel wire


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

  30KH   ( 30Х ) - 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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