| Grade : | 55L ( 55Л ) |
| Substitute: | 50Л |
| Classification : | Non-alloy casting steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 55L ( 55Л )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.52 - 0.6 | 0.2 - 0.52 | 0.4 - 0.9 | max 0.3 | max 0.045 | max 0.04 | max 0.3 | max 0.3 |
Temperature of critical points for grade 55L ( 55Л ).
| Ac1 = 725 , Ac3(Acm) = 770 , Ar3(Arcm) = 755 , Ar1 = 690 |
Mechanical properties under Т=20oС for grade 55L ( 55Л )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Casting | to 100 | 600 | 350 | 10 | 18 | 240 | Normalizing 840 - 860oC,Drawing 600 - 630oC, |
| Brinell hardness for 55L ( 55Л ) , | HB 10 -1 = 159 - 255 MPa |
Technological properties for grade 55L ( 55Л )
| Weldability: | hard weldability. |
| Flakes : | not predisposed |
| Temper brittleness: | not predisposed |
Technological properties of the material 55L ( 55Л ) .
| Linear shrinkage : | 2.2 - 2.3 % |
Physical properties for grade 55L ( 55Л )
| 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 | 7820 | |||||
| 100 | 11 | 68 | 479 | |||
| 200 | 11.8 | 55 | 487 | |||
| 300 | ||||||
| 400 | 13.4 | 36 | 525 | |||
| 500 | 32 | |||||
| 600 | 14.5 | 571 | ||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 55L ( 55Л )
| USA | Germany | Japan | France | England | Czechia | |||||||
| - | DIN,WNr | JIS | AFNOR | BS | CSN | |||||||
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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 |
55L ( 55Л ) - 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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