| Grade : | 25Kh1MF ( 25Х1МФ ) ( ЭИ10 ) |
| Classification : | Relaxation-resistant steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 25Kh1MF ( 25Х1МФ )
| C | Si | Mn | Ni | S | P | Cr | Mo | V | Cu |
| 0.22 - 0.29 | 0.17 - 0.37 | 0.4 - 0.7 | max 0.3 | max 0.025 | max 0.03 | 1.5 - 1.8 | 0.25 - 0.35 | 0.15 - 0.3 | max 0.2 |
Temperature of critical points for grade 25Kh1MF ( 25Х1МФ ).
| Ac1 = 760 , Ac3(Acm) = 840 , Ar3(Arcm) = 760 - 780 , Ar1 = 680 - 690 |
Mechanical properties under Т=20oС for grade 25Kh1MF ( 25Х1МФ )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar, band, GOST 20072-74 | max thickness 25 | longitudinal | 880 | 735 | 14 | 50 | 590 | Guenching 880 - 900oC, oil, Drawing 640 - 660oC,Cooling air, |
| Bar, band, GOST 20072-74 | longitudinal | 780 | 665 | 16 | 50 | 590 | Guenching 930 - 950oC, oil, Drawing 620 - 660oC, |
| Brinell hardness for 25Kh1MF ( 25Х1МФ ) (quenching, tempering) , | HB 10 -1 = 241 - 321 MPa |
| Brinell hardness for 25Kh1MF ( 25Х1МФ ) (hot-rolled, annealing) , GOST 20072-74 | HB 10 -1 = 229 MPa |
Technological properties for grade 25Kh1MF ( 25Х1МФ )
| Weldability: | hard weldability. |
| Flakes : | predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade 25Kh1MF ( 25Х1МФ )
| 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 | 2.17 | 7840 | ||||
| 100 | 2.11 | 11.3 | 39.8 | 462 | 312 | |
| 200 | 2.06 | 11.7 | 37.9 | 7790 | 396 | |
| 300 | 1.98 | 12.8 | 36.9 | 475 | ||
| 400 | 1.91 | 13.9 | 35.9 | 7720 | 574 | |
| 500 | 1.8 | 14.2 | 34.8 | 680 | ||
| 600 | 1.67 | 14.4 | 7650 | 826 | ||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 25Kh1MF ( 25Х1МФ )
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| - | DIN,WNr | AFNOR | BS | EN | GB | CSN | ||||||||||
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Types of delivery of grade 25Kh1MF ( 25Х1МФ )
| B03 - Metal forming treatment. Forgings |
| 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 |
25Kh1MF ( 25Х1МФ ) - Relaxation-resistant steel: chemical composition, mechanical and physical properties, hardness
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