Metals -> Structural steel -> High quality structural carbon steel Characteristics of the material 20 ( 20, 20 ).
Material : 20 ( 20, 20 ) Substitute: 15, 25 Classification : High quality structural carbon steel
Chemical composition in % of the material 20 ( 20, 20 ) . C Si Mn Ni S P Cr Cu As 0.17 - 0.24 0.17 - 0.37 0.35 - 0.65 max 0.25 max 0.04 max 0.04 max 0.25 max 0.25 max 0.08
Temperature of critical points of the grade 20 ( 20, 20 ).
Ac1 = 724 , Ac3 (Acm ) = 845 , Ar3 (Arcm ) = 815 , Ar1 = 682
Mechanical properties under Т=20o С of the material 20 ( 20, 20 ) .
Assortment Dimension Direct. s в s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Rolled stock hotrolled to 80 longitudinal 420 250 25 55 Normalizing Bar longitudinal 480 270 30 62 1450 Annealing 880 - 900o C, Bar longitudinal 510 320 30.7 67 1000 Normalizing 880 - 920o C,
Brinell hardness of the material 20 ( 20, 20 ) (annealing) , HB 10 -1 = 163 MPa Brinell hardness of the material 20 ( 20, 20 ) (cold-drawn, cold-worked) , HB 10 -1 = 207 MPa
Physical properties of the material 20 ( 20, 20 ) . 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 2.13 52 7859 100 2.03 11.6 50.6 7834 486 219 200 1.99 12.6 48.6 7803 498 292 300 1.9 13.1 46.2 7770 514 381 400 1.82 13.6 42.8 7736 533 487 500 1.72 14.1 39.1 7699 555 601 600 1.6 14.6 35.8 7659 584 758 700 14.8 32 7617 636 925 800 12.9 7624 703 1094 900 7600 703 1135 1000 695 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 20 ( 20, 20 ) . Weldability: without limitations. Flakes : not predisposed Temper brittleness: not predisposed
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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