Metals -> Casting steel -> Casting steel for general purposes Characteristics of the material 20L ( 20L, 20Л ).
Material : 20L ( 20L, 20Л ) Substitute: 25Л, 30Л Classification : Casting steel for general purposes
Chemical composition in % of the material 20L ( 20L, 20Л ) . C Si Mn Ni S P Cr Cu 0.17 - 0.25 0.2 - 0.52 0.35 - 0.9 max 0.3 max 0.045 max 0.04 max 0.3 max 0.3
Temperature of critical points of the grade 20L ( 20L, 20Л ).
Ac1 = 735 , Ac3 (Acm ) = 854 , Ar3 (Arcm ) = 835 , Ar1 = 680
Mechanical properties under Т=20o С of the material 20L ( 20L, 20Л ) .
Assortment Dimension Direct. s в s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Casting to 100 420 220 22 35 500 Normalizing 880 - 900o C,Drawing 630 - 650o C,
Physical properties of the material 20L ( 20L, 20Л ) . 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 2.01 54 7850 170 100 1.96 12.2 53 487 220 200 1.88 12.7 51 500 294 300 1.83 13.1 48 517 385 400 1.73 13.5 43 533 490 500 1.65 13.9 39 559 604 600 1.52 14.4 35 588 761 700 1.32 14.9 32 638 932 800 1.2 12.6 27 706 1101 900 12.4 27 706 1139 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 20L ( 20L, 20Л ) . Weldability: without limitations. Flakes : not predisposed Temper brittleness: not predisposed
Technological properties of the material 20L ( 20L, 20Л ) . Linear shrinkage, % : 2.2 - 2.3
Specification :
Mechanical properties : s в - 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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