Metals -> High-temperature or heat-resistant steel and alloy -> Relaxation-resistant steel Characteristics of the material 35KHM ( 35HM, 35ÕÌ ).
Material : 35KHM ( 35HM, 35ÕÌ ) Substitute: 40Õ, 40ÕÍ, 30ÕÌ, 35ÕÃÑÀ Classification : Relaxation-resistant steel
Chemical composition in % of the material 35KHM ( 35HM, 35ÕÌ ) . C Si Mn Ni S P Cr Mo Cu 0.32 - 0.4 0.17 - 0.37 0.4 - 0.7 max 0.3 max 0.035 max 0.035 0.8 - 1.1 0.15 - 0.25 max 0.3
Temperature of critical points of the grade 35KHM ( 35HM, 35ÕÌ ).
Ac1 = 755 , Ac3 (Acm ) = 800 , Ar3 (Arcm ) = 750 , Ar1 = 695
Mechanical properties under Ò=20o Ñ of the material 35KHM ( 35HM, 35ÕÌ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Forging max thickness 100 longitudinal 950 750 13 42 650 Guenching 850 - 880o C, oil, Drawing 585 - 650o C, Forging max thickness 120 longitudinal 900 710 13 42 650 Guenching 850 - 880o C, oil, Drawing 585 - 650o C, Forging max thickness 150 longitudinal 800 600 14 45 650 Guenching 850 - 880o C, oil, Drawing 585 - 650o C, Forging max thickness 200 longitudinal 700 500 16 45 600 Guenching 850 - 880o C, oil, Drawing 585 - 650o C,
Brinell hardness of the material 35KHM ( 35HM, 35ÕÌ ) (annealing) , HB 10 -1 = 241 MPa
Physical properties of the material 35KHM ( 35HM, 35ÕÌ ) . 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 2.18 7820 328 100 2.16 12.3 40.6 7800 462 360 200 12.6 39.8 7770 300 2.05 12.9 38.5 7740 425 400 1.95 13.9 37.3 7700 523 500 1.86 14.4 7660 628 600 14.6 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 35KHM ( 35HM, 35ÕÌ ) . Weldability: limited weldability. Flakes : predisposed Temper brittleness: not predisposed
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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