Metals -> High-temperature or heat-resistant steel and alloy -> High alloy high-temperature steel Characteristics of the material 20KH12VNMF ( 20H12VNMF, 20Õ12ÂÍÌÔ ).
Material : 20KH12VNMF ( 20H12VNMF, 20Õ12ÂÍÌÔ ) Classification : High alloy high-temperature steel
Chemical composition in % of the material 20KH12VNMF ( 20H12VNMF, 20Õ12ÂÍÌÔ ) . C Si Mn Ni S P Cr Mo W V 0.17 - 0.23 max 0.6 0.5 - 0.9 0.5 - 0.9 max 0.025 max 0.03 10.5 - 12.5 0.5 - 0.7 0.7 - 1.1 0.15 - 0.3
Temperature of critical points of the grade 20KH12VNMF ( 20H12VNMF, 20Õ12ÂÍÌÔ ).
Ac1 = 800 , Ac3 (Acm ) = 860
Mechanical properties under Ò=20o Ñ of the material 20KH12VNMF ( 20H12VNMF, 20Õ12ÂÍÌÔ ) .
Assortment
Dimension
Direct.
s â
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - Bars 750 600 15 50 600 Guenching 1010 - 1060o C, oil, Drawing 660 - 670o C, air,
Brinell hardness of the material 20KH12VNMF ( 20H12VNMF, 20Õ12ÂÍÌÔ ) (annealing) , HB 10 -1 = 229 MPa
Physical properties of the material 20KH12VNMF ( 20H12VNMF, 20Õ12ÂÍÌÔ ) . 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 2.12 7850 100 2.07 10.6 25 7830 200 2.02 10.9 25 7800 300 1.96 11.2 26 7780 400 1.9 11.4 26 7760 500 1.81 11.7 27 7730 600 1.67 11.9 27 7700 700 12 7670 800 12.1 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 20KH12VNMF ( 20H12VNMF, 20Õ12ÂÍÌÔ ) . Weldability: hard weldability.
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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