| Grade : | 38KHS ( 38ХС ) |
| Substitute: | 40ХС |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 38KHS ( 38ХС )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.34 - 0.42 | 1 - 1.4 | 0.3 - 0.6 | max 0.3 | max 0.035 | max 0.035 | 1.3 - 1.6 | max 0.3 |
Temperature of critical points for grade 38KHS ( 38ХС ).
| Ac1 = 763 , Ac3(Acm) = 810 , Ar3(Arcm) = 755 , Ar1 = 680 , Mn = 330 |
Mechanical properties under Т=20oС for grade 38KHS ( 38ХС )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar, GOST 4543-71 | Ø 25 | 930 | 735 | 12 | 50 | 690 | Guenching 900oC, water, Drawing 630oC, water, | |
| Forging | to 100 | 685 | 540 | 15 | 45 | 590 | Guenching and drawing |
| Brinell hardness for 38KHS ( 38ХС ) (annealing) , GOST 4543-71 | HB 10 -1 = 255 MPa |
Technological properties for grade 38KHS ( 38ХС )
| Weldability: | hard weldability. |
| Flakes : | not predisposed |
| Temper brittleness: | predisposed |
Physical properties for grade 38KHS ( 38ХС )
| 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 | 38 | 7640 | 284 | ||
| 100 | 2.03 | 12.3 | 38 | 466 | 329 | |
| 200 | 1.94 | 13.1 | 37 | 508 | 413 | |
| 300 | 1.84 | 13.6 | 35 | 529 | 563 | |
| 400 | 1.74 | 13.8 | 34 | 563 | 725 | |
| 500 | 1.66 | 14.2 | 33 | 592 | 902 | |
| 600 | 1.57 | 14.5 | 31 | 621 | 1060 | |
| 700 | 1.39 | 14.7 | 29 | 634 | 1280 | |
| 800 | 1.27 | 12.5 | 28 | 663 | ||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 38KHS ( 38ХС )
| Bulgaria | Poland | Czechia | |||
| BDS | PN | CSN | |||
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Types of delivery of grade 38KHS ( 38ХС )
| B03 - Metal forming treatment. Forgings |
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| В32 - Graded and shaped rolling |
| В71 - Low-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 |
38KHS ( 38ХС ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
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