| Grade : | 20kp ( 20кп ) |
| Substitute: | 15кп |
| Classification : | High quality structural carbon steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 20kp ( 20кп )
| C | Si | Mn | Ni | S | P | Cr | Cu | As |
| 0.17 - 0.24 | max 0.07 | 0.25 - 0.5 | max 0.3 | max 0.04 | max 0.035 | max 0.25 | max 0.3 | max 0.08 |
Temperature of critical points for grade 20kp ( 20кп ).
| Ac1 = 735 , Ac3(Acm) = 850 , Ar3(Arcm) = 835 , Ar1 = 680 |
Mechanical properties under Т=20oС for grade 20kp ( 20кп )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Sheet heat-treatment, GOST 4041-71 | 4 - 14 | 340-490 | 28 | |||||
| Pipe, GOST 10705-80 | 372 | 225 | 22 | |||||
| Steel cold-drawn , GOST 10702-78 | 490 | 7 | 45 | |||||
| Strip, GOST 1577-93 | 6 - 60 | 380 | 225 | 27 | 55 | Normalizing |
| Brinell hardness for 20kp ( 20кп ) , Sheet GOST 4041-71 | HB 10 -1 = 127 MPa |
| Brinell hardness for 20kp ( 20кп ) , Sheet trick GOST 1577-93 | HB 10 -1 = 156 MPa |
Technological properties for grade 20kp ( 20кп )
| Weldability: | without limitations. |
| Flakes : | not predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade 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 |
Equivalent steels for grade 20kp ( 20кп )
| USA | Germany | European | |||||||||
| - | DIN,WNr | EN | |||||||||
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Types of delivery of grade 20kp ( 20кп )
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| B24 - Ribbons |
| В32 - Graded and shaped rolling |
| B33 - Sheets and Strips |
| B34 - Ribbons |
| В62 - Steel pipes and connecting parts to them |
| В71 - Low-carbon steel wire |
| В72 - Medium-high and high-carbon steel wire |
Specification :
| Mechanical properties : | |
| sв | - Tensile strength , [MPa] |
| sT | - Yield stress, [MPa] |
| d5 | - 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 |
20kp ( 20кп ) - High quality structural carbon steel: chemical composition, mechanical and physical properties, hardness
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