Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 30KH ( 30H, 30Х ).
Material : 30KH ( 30H, 30Х ) Substitute: 30ХРА, 35Х, 35ХРА Classification : Alloy structurall steel
Chemical composition in % of the material 30KH ( 30H, 30Х ) . C Si Mn Ni S P Cr Cu 0.24 - 0.32 0.17 - 0.37 0.5 - 0.8 max 0.3 max 0.035 max 0.035 0.8 - 1.1 max 0.3
Temperature of critical points of the grade 30KH ( 30H, 30Х ).
Ac1 = 740 , Ac3 (Acm ) = 815 , Ar1 = 670
Mechanical properties under Т=20o С of the material 30KH ( 30H, 30Х ) .
Assortment
Dimension
Direct.
s в
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - 900 700 12 45 700 Bar Ж 40 850 670 17 65 1000 Guenching 850 - 870o C, oil, Drawing 500 - 600o C, air,
Brinell hardness of the material 30KH ( 30H, 30Х ) (annealing) , HB 10 -1 = 187 MPa Brinell hardness of the material 30KH ( 30H, 30Х ) (cold-drawn, cold-worked) , HB 10 -1 = 207 MPa
Physical properties of the material 30KH ( 30H, 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
Technological properties of the material 30KH ( 30H, 30Х ) . Weldability: limited weldability. Flakes : predisposed Temper brittleness: predisposed
Specification :
Mechanical properties :
s в - Tensile strength , [MPa]
s T - Yield stress, [MPa]
d 5 - 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
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