Metals -> High-temperature or heat-resistant steel and alloy -> Hidh-temperature or heat-resistant alloy Characteristics of the material KHN78T ( HN78T, ÕÍ78Ò ).
Material : KHN78T ( HN78T, ÕÍ78Ò ) Substitute: ÕÍ38ÂÒ, 12Õ25Í16Ã7ÀÐ, 20Õ23Í18 Classification : Hidh-temperature or heat-resistant alloy
Chemical composition in % of the material KHN78T ( HN78T, ÕÍ78Ò ) . Fe C Si Mn Ni S P Cr Ti max 6 max 0.12 max 0.8 max 0.7 70.003 - 80.85 max 0.012 max 0.015 19 - 22 0.15 - 0.35
Mechanical properties under Ò=20o Ñ of the material KHN78T ( HN78T, ÕÍ78Ò ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Sheet to 3.9 860 35 Guenching 980 - 1020o C,Cooling air, Bar to Æ 30 700 300 30 50 Sheet 4 - 11 880 30 Guenching 980 - 1020o C,Cooling air, Forging 588 196 25 35
Brinell hardness of the material KHN78T ( HN78T, ÕÍ78Ò ) (quenching) , HB 10 -1 = 200 MPa
Physical properties of the material KHN78T ( HN78T, ÕÍ78Ò ) . 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 2.24 8400 1090 100 2.19 12.2 14.6 8380 1099 200 2.13 13 16.7 8340 1108 300 2.06 13.4 18.5 8310 1117 400 2 13.8 20.6 8260 1127 500 1.93 14.1 22.7 8220 1153 600 1.84 14.7 24.8 8180 1135 700 15.4 26.8 8130 1126 800 15.5 28.9 8090 1123 900 8040 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material KHN78T ( HN78T, ÕÍ78Ò ) . 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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