| Grade : | 20L ( 20Л ) |
| Substitute: | 25Л, 30Л |
| Classification : | Non-alloy casting steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 20L ( 20Л )
| C | Si | Mn | S | P |
| 0.17 - 0.25 | 0.2 - 0.52 | 0.45 - 0.9 | max 0.06 | max 0.06 |
Temperature of critical points for grade 20L ( 20Л ).
| Ac1 = 735 , Ac3(Acm) = 854 , Ar3(Arcm) = 835 , Ar1 = 680 |
Mechanical properties under Т=20oС for grade 20L ( 20Л )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Casting, GOST 977-88 | to 100 | 412 | 216 | 22 | 35 | 491 | Normalizing 880 - 900oC,Drawing 630 - 650oC, |
Technological properties for grade 20L ( 20Л )
| Weldability: | without limitations. |
| Flakes : | not predisposed |
| Temper brittleness: | not predisposed |
Technological properties of the material 20L ( 20Л ) .
| Linear shrinkage : | 2.2 - 2.3 % |
Heat treatment of the material 20L ( 20Л )
| Normalizing 880 - 900 ° C or Normalizing 880 - 900 ° C, Tempering 630 - 650 ° C |
Physical properties for grade 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 |
Equivalent steels for grade 20L ( 20Л )
| USA | Germany | Japan | France | England | Italy | Poland | Czechia | Austria | ||||||||||||||||
| - | DIN,WNr | JIS | AFNOR | BS | UNI | PN | CSN | ONORM | ||||||||||||||||
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Types of delivery of grade 20L ( 20Л )
| B42 - Rails: Pads, Pads, Crutches |
| B82 - Steel Castings |
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 |
20L ( 20Л ) - Non-alloy casting 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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