| Grade : | 25KHGSА ( 25ХГСА ) |
| Substitute: | 20ХГСА |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 25KHGSА ( 25ХГСА )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.22 - 0.28 | 0.9 - 1.2 | 0.8 - 1.1 | max 0.3 | max 0.025 | max 0.025 | 0.8 - 1.1 | max 0.3 |
Temperature of critical points for grade 25KHGSА ( 25ХГСА ).
| Ac1 = 755 , Ac3(Acm) = 840 , Ar1 = 690 |
Mechanical properties under Т=20oС for grade 25KHGSА ( 25ХГСА )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar, GOST 4543-71 | Ø 15 | 1080 | 835 | 10 | 40 | 590 | Guenching 880oC, oil, Drawing 480oC, water, | |
| Sheet trick, GOST 11269-76 | 490-690 | 21 | Normalizing | |||||
| Sheet trick, GOST 11269-76 | 1030 | 10 | 490 | Guenching and drawing | ||||
| Sheet thin, GOST 11268-76 | 490-690 | 21 | Normalizing | |||||
| Sheet thin, GOST 11268-76 | 1080 | 10 | Guenching and drawing |
| Brinell hardness for 25KHGSА ( 25ХГСА ) (annealing) , GOST 4543-71 | HB 10 -1 = 217 MPa |
| Brinell hardness for 25KHGSА ( 25ХГСА ) (normalize) , Sheet trick GOST 11269-76 | HB 10 -1 = 149 - 207 MPa |
Technological properties for grade 25KHGSА ( 25ХГСА )
| Weldability: | without limitations. |
| Flakes : | predisposed |
| Temper brittleness: | predisposed |
Physical properties for grade 25KHGSА ( 25ХГСА )
| 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 | 2.13 | 35 | 7850 | 306 | ||
| 100 | 2.06 | 12.2 | 36 | 7830 | 496 | 338 |
| 200 | 1.94 | 13 | 37 | 7790 | 504 | 415 |
| 300 | 1.87 | 13.6 | 37 | 7760 | 512 | 501 |
| 400 | 1.75 | 14 | 39 | 7730 | 533 | 573 |
| 500 | 1.68 | 14.2 | 34 | 7690 | 554 | 660 |
| 600 | 1.63 | 14.4 | 32 | 7650 | 584 | 830 |
| 700 | 1.43 | 14.5 | 31 | 7610 | 622 | 1000 |
| 800 | 1.3 | 12.3 | 29 | 693 | 1100 | |
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 25KHGSА ( 25ХГСА )
| Bulgaria | Poland | ||
| BDS | PN | ||
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Types of delivery of grade 25KHGSА ( 25ХГСА )
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| В32 - Graded and shaped rolling |
| 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 |
25KHGSА ( 25ХГСА ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
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