| Grade : | 20K ( 20К ) |
| Substitute: | 15К |
| Classification : | High quality structural carbon steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 20K ( 20К )
| C | Si | Mn | Ni | S | P | Cr | Cu | As |
| 0.16 - 0.24 | 0.15 - 0.3 | 0.35 - 0.65 | max 0.3 | max 0.04 | max 0.04 | max 0.3 | max 0.3 | max 0.08 |
Temperature of critical points for grade 20K ( 20К ).
| Ac1 = 724 , Ac3(Acm) = 845 , Ar3(Arcm) = 817 , Ar1 = 682 |
Mechanical properties under Т=20oС for grade 20K ( 20К )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Sheet, GOST 5520-79 | 400-510 | 225-245 | 23-25 | 490-590 |
Technological properties for grade 20K ( 20К )
| Weldability: | without limitations. |
| Flakes : | not predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade 20K ( 20К )
| 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 | 2.11 | 7870 | 482 | 200 | ||
| 100 | 2.08 | 51 | 7840 | 486 | 219 | |
| 200 | 2.05 | 12 | 49 | 7810 | 498 | 292 |
| 300 | 2 | 12.8 | 46 | 7780 | 514 | 381 |
| 400 | 1.91 | 13.2 | 42 | 7740 | 533 | 487 |
| 500 | 1.8 | 13.6 | 39 | 7710 | 555 | 601 |
| 600 | 1.65 | 13.85 | 36 | 7670 | 584 | 758 |
| 700 | 7630 | 636 | 925 | |||
| 800 | 7640 | 703 | 1094 | |||
| 900 | 7610 | 703 | 1135 | |||
| 1000 | 7550 | 695 | 1167 | |||
| 1100 | 7490 | 691 | 1194 | |||
| 1200 | 687 | 1219 | ||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 20K ( 20К )
| USA | Germany | Japan | France | England | European | Italy | Belgium | Spain | Sweden | Bulgaria | Hungary | Poland | Romania | Czechia | Austria | South Korea | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| - | DIN,WNr | JIS | AFNOR | BS | EN | UNI | NBN | UNE | SS | BDS | MSZ | PN | STAS | CSN | ONORM | KS | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Types of delivery of grade 20K ( 20К )
| B23 - Sheets and Strips |
| B33 - Sheets and Strips |
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 |
20K ( 20К ) - High quality structural carbon steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys
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