| Grade : | 40KHL ( 40ХЛ ) |
| Substitute: | 30ГСЛ, 35ГСЛ |
| Classification : | Casting alloy steel for general purposes |
| Equivalent grades: | Go here |
Chemical composition in % for grade 40KHL ( 40ХЛ )
| C | Si | Mn | S | P | Cr |
| 0.35 - 0.45 | 0.2 - 0.4 | 0.4 - 0.9 | max 0.04 | max 0.04 | 0.8 - 1.1 |
Temperature of critical points for grade 40KHL ( 40ХЛ ).
| Ac1 = 743 , Ac3(Acm) = 782 , Ar3(Arcm) = 730 , Ar1 = 693 |
Mechanical properties under Т=20oС for grade 40KHL ( 40ХЛ )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Casting, GOST 977-88 | to 100 | 638 | 491 | 12 | 25 | 392 | Normalizing 850 - 860oC,Drawing 600 - 650oC, |
| Brinell hardness for 40KHL ( 40ХЛ ) , | HB 10 -1 = 196 - 229 MPa |
Technological properties for grade 40KHL ( 40ХЛ )
| Weldability: | limited weldability. |
| Flakes : | weakly predisposed |
| Temper brittleness: | predisposed |
Technological properties of the material 40KHL ( 40ХЛ ) .
| Linear shrinkage : | 2.2 - 2.3 % |
Heat treatment of the material 40KHL ( 40ХЛ )
| Hardening 850 - 870 ° C, Tempering 600 - 650 ° C |
Physical properties for grade 40KHL ( 40ХЛ )
| 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 | 2.19 | 48 | 7830 | 233 | ||
| 100 | 2.16 | 12.2 | 46 | 491 | 270 | |
| 200 | 2.1 | 12.7 | 45 | 508 | 335 | |
| 300 | 2.04 | 13.1 | 42 | 525 | 435 | |
| 400 | 1.85 | 13.4 | 39 | 538 | 540 | |
| 500 | 1.76 | 13.8 | 35 | 567 | 665 | |
| 600 | 1.64 | 13.2 | 32 | 588 | 815 | |
| 700 | 1.43 | 14.6 | 28 | 626 | 975 | |
| 800 | 1.32 | 11.8 | 27 | 701 | 1115 | |
| 900 | 12.6 | 27 | 689 | 1195 | ||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 40KHL ( 40ХЛ )
| Bulgaria | Hungary | Poland | |||
| BDS | MSZ | PN | |||
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Types of delivery of grade 40KHL ( 40ХЛ )
| 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 |
40KHL ( 40ХЛ ) - Casting alloy steel for general purposes: chemical composition, mechanical and physical properties, hardness
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