Metals -> High-temperature or heat-resistant steel and alloy -> Low alloy high-temperature steel Characteristics of the material 15KHM ( 15HM, 15ХМ ).
Material : 15KHM ( 15HM, 15ХМ ) Classification : Low alloy high-temperature steel
Chemical composition in % of the material 15KHM ( 15HM, 15ХМ ) . C Si Mn Ni S P Cr Mo Cu 0.11 - 0.18 0.17 - 0.37 0.4 - 0.7 max 0.3 max 0.035 max 0.035 0.8 - 1.1 0.4 - 0.55 max 0.3
Temperature of critical points of the grade 15KHM ( 15HM, 15ХМ ).
Ac1 = 740 , Ac3 (Acm ) = 875
Mechanical properties under Т=20o С of the material 15KHM ( 15HM, 15ХМ ) .
Assortment Dimension Direct. s в s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Bar longitudinal 540 350 25 67 2700 Normalizing 900 - 920o C,Drawing 630 - 650o C, air, Bar Ж 30 440 275 21 55 118 Guenching 880o C, air, Drawing 650o C, air,
Brinell hardness of the material 15KHM ( 15HM, 15ХМ ) (annealing) , HB 10 -1 = 179 MPa
Physical properties of the material 15KHM ( 15HM, 15ХМ ) . 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 2.05 7850 100 12.2 44 7830 487 200 13 41 7800 300 13.3 41 7760 400 13.7 39 7730 450 1.72 500 14 36 7700 600 14.3 34 7660 700 14.5 800 13.4 29 900 11.2 29 1000 12.5 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 15KHM ( 15HM, 15ХМ ) . Weldability: without limitations. Flakes : predisposed Temper brittleness: not 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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