Metals -> Structural steel -> High quality structural carbon steel Characteristics of the material 20kp ( 20kp, 20кп ).
Material : 20kp ( 20kp, 20кп ) Substitute: 15кп Classification : High quality structural carbon steel
Chemical composition in % of the material 20kp ( 20kp, 20кп ) . C Si Mn Ni S P Cr Cu As 0.17 - 0.24 max 0.07 0.25 - 0.5 max 0.25 max 0.04 max 0.035 max 0.25 max 0.25 max 0.08
Temperature of critical points of the grade 20kp ( 20kp, 20кп ).
Ac1 = 735 , Ac3 (Acm ) = 850 , Ar3 (Arcm ) = 835 , Ar1 = 680
Mechanical properties under Т=20o С of the material 20kp ( 20kp, 20кп ) .
Assortment
Dimension
Direct.
s в
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - Steel cold-drawn 490 7 45
Brinell hardness of the material 20kp ( 20kp, 20кп ) (cold-drawn, cold-worked) , HB 10 -1 = 197 MPa Brinell hardness of the material 20kp ( 20kp, 20кп ) (hot-rolled, annealing) , HB 10 -1 = 143 MPa Brinell hardness of the material 20kp ( 20kp, 20кп ) (annealing) , HB 10 -1 = 163 MPa
Physical properties of the material 20kp ( 20kp, 20кп ) . 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 2.12 100 2.08 12.3 51 7834 486 219 200 2.03 13.1 49 7803 498 292 300 1.97 13.8 44 7770 514 381 400 1.89 14.3 43 7736 533 487 500 1.77 14.8 39 7699 555 601 600 1.63 15.1 36 7659 584 758 700 1.4 15.2 32 7617 636 925 800 26 7624 703 1094 900 26 7600 703 1135 1000 695 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 20kp ( 20kp, 20кп ) . 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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