Metals -> High-temperature or heat-resistant steel and alloy -> High alloy high-temperature steel Characteristics of the material 37KH12N8G8MFB ( 37H12N8G8MFB, 37Õ12Í8Ã8ÌÔÁ ).
Material : 37KH12N8G8MFB ( 37H12N8G8MFB, 37Õ12Í8Ã8ÌÔÁ ) Classification : High alloy high-temperature steel
Chemical composition in % of the material 37KH12N8G8MFB ( 37H12N8G8MFB, 37Õ12Í8Ã8ÌÔÁ ) . C Si Mn Ni S P Cr Mo V Nb Cu 0.34 - 0.4 0.3 - 0.8 7.5 - 9.5 7 - 9 max 0.03 max 0.035 11.5 - 13.5 1.1 - 1.4 1.25 - 1.55 0.25 - 0.45 max 0.3
Mechanical properties under Ò=20o Ñ of the material 37KH12N8G8MFB ( 37H12N8G8MFB, 37Õ12Í8Ã8ÌÔÁ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - 1000 600 20 25 350 Heating 1140 - 1160o C, 1h,Cooling water, Ageing 660 - 790o C, 10 - 16h, air,
Brinell hardness of the material 37KH12N8G8MFB ( 37H12N8G8MFB, 37Õ12Í8Ã8ÌÔÁ ) (annealing) , Bar HB 10 -1 = 269 MPa
Physical properties of the material 37KH12N8G8MFB ( 37H12N8G8MFB, 37Õ12Í8Ã8ÌÔÁ ) . 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 1.74 7850 740 100 15.9 17.2 850 200 1.6 17.1 18.5 900 300 1.5 18.2 19.7 950 400 1.43 19.2 21.4 1010 500 1.35 20.3 23 1100 600 1.28 21.2 24.8 1150 700 1.25 22.2 25.9 1200 800 23.2 27.2 900 24.2 29.3 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 37KH12N8G8MFB ( 37H12N8G8MFB, 37Õ12Í8Ã8ÌÔÁ ) . Weldability: limited 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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