Metals -> High-temperature or heat-resistant steel and alloy -> Relaxation-resistant steel Characteristics of the material 20KHMFBR ( 20HMFBR, 20ÕÌÔÁÐ ).
Material : 20KHMFBR ( 20HMFBR, 20ÕÌÔÁÐ ) Classification : Relaxation-resistant steel
Chemical composition in % of the material 20KHMFBR ( 20HMFBR, 20ÕÌÔÁÐ ) . C Si Mn Ni S P Cr Mo V Nb Cu B 0.17 - 0.26 max 0.37 0.5 - 0.8 max 0.45 max 0.03 max 0.03 1 - 1.5 0.8 - 1.1 0.7 - 1 max 0.15 max 0.2 max 0.005
Temperature of critical points of the grade 20KHMFBR ( 20HMFBR, 20ÕÌÔÁÐ ).
Ac1 = 810 , Ac3 (Acm ) = 950 , Ar3 (Arcm ) = 800 , Ar1 = 690
Mechanical properties under Ò=20o Ñ of the material 20KHMFBR ( 20HMFBR, 20ÕÌÔÁÐ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Bar longitudinal 900 15 55 400 Normalizing 1100o C,Drawing 730o C, 5h, 1076 958 13.3 46.6 150 Normalizing 1100o C,Drawing 650o C, 6h,
Physical properties of the material 20KHMFBR ( 20HMFBR, 20ÕÌÔÁÐ ) . 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 2.17 7900 100 2.11 41 200 2.05 46.1 300 1.96 48.2 400 1.88 50.2 500 1.8 52.8 600 1.67 54.4 700 1.52 56.1 T E 10- 5 a 10 6 l r C R 10 9
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]
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