Metals -> High-temperature or heat-resistant steel and alloy -> Low alloy high-temperature steel Characteristics of the material 12KHM ( 12HM, 12ХМ ).
Material : 12KHM ( 12HM, 12ХМ ) Classification : Low alloy high-temperature steel
Chemical composition in % of the material 12KHM ( 12HM, 12ХМ ) . C Si Mn Ni S P Cr Mo Cu 0.09 - 0.15 0.15 - 0.3 0.4 - 0.7 max 0.25 max 0.025 max 0.03 0.4 - 0.6 0.4 - 0.6 max 0.2
Temperature of critical points of the grade 12KHM ( 12HM, 12ХМ ).
Ac1 = 720 , Ac3 (Acm ) = 880 , Ar3 (Arcm ) = 790 , Ar1 = 695
Mechanical properties under Т=20o С of the material 12KHM ( 12HM, 12ХМ ) .
Assortment Dimension Direct. s в s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Pipe Ж 273 x 28 longitudinal 455 284 31.5 66.5 1930 Normalizing 910 - 930o C,Drawing 670 - 690o C,Cooling air, Sheet 4 - 50 440 245 22 600
Physical properties of the material 12KHM ( 12HM, 12ХМ ) . 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 2.16 7850 498 100 2.1 11.2 50.24 240 200 2.04 12.5 50.24 519 330 300 1.99 12.7 50.24 569 410 400 1.93 12.9 48.56 595 540 500 1.82 13.2 46.89 653 640 600 1.73 13.5 46.05 733 740 700 13.8 43.96 888 900 T E 10- 5 a 10 6 l r C R 10 9
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]
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