Metals -> High-temperature or heat-resistant steel and alloy -> High alloy high-temperature steel Characteristics of the material 18KH12VMBFR ( 18H12VMBFR, 18Õ12ÂÌÁÔÐ ).
Material : 18KH12VMBFR ( 18H12VMBFR, 18Õ12ÂÌÁÔÐ ) Classification : High alloy high-temperature steel
Chemical composition in % of the material 18KH12VMBFR ( 18H12VMBFR, 18Õ12ÂÌÁÔÐ ) . C Si Mn Ni S P Cr Mo W V Nb B 0.15 - 0.22 max 0.5 max 0.5 max 0.06 max 0.025 max 0.03 11 - 13 0.4 - 0.6 0.4 - 0.7 0.15 - 0.18 0.2 - 0.4 max 0.003
Temperature of critical points of the grade 18KH12VMBFR ( 18H12VMBFR, 18Õ12ÂÌÁÔÐ ).
Ac1 = 850 , Ac3 (Acm ) = 930
Mechanical properties under Ò=20o Ñ of the material 18KH12VMBFR ( 18H12VMBFR, 18Õ12ÂÌÁÔÐ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Pipe Æ 30 x 6 dihedral 820 640 17 56 900 Normalizing 1050o C,Cooling air, Drawing 750o C, 3h,Cooling air, Pipe Æ 219 x 27 dihedral 750 590 15 43 400 Normalizing 1050o C,Cooling air, Drawing 750o C, 3h,Cooling air, Bars 60 740 490 12 45 390 Guenching and drawing
Brinell hardness of the material 18KH12VMBFR ( 18H12VMBFR, 18Õ12ÂÌÁÔÐ ) (annealing) , HB 10 -1 = 229 MPa
Physical properties of the material 18KH12VMBFR ( 18H12VMBFR, 18Õ12ÂÌÁÔÐ ) . 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 2.28 27.6 7850 100 11.15 21.8 200 2.15 11.13 24 300 2.09 11.42 25.1 400 1.95 11.8 26.3 500 1.88 12 27.2 600 1.73 12.5 28 700 1.55 12.65 28.9 800 11.6 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 18KH12VMBFR ( 18H12VMBFR, 18Õ12ÂÌÁÔÐ ) . Weldability: is not used.
Specification :
Mechanical properties : s â - 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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