| Grade : | 20Kh3MVF ( 20Х3МВФ ) ( ЭИ415 ЭИ579 ) |
| Classification : | Relaxation-resistant steel |
| Equivalent grades: | Is absent |
Chemical composition in % for grade 20Kh3MVF ( 20Х3МВФ )
| C | Si | Mn | Ni | S | P | Cr | Mo | W | V | Cu |
| 0.15 - 0.23 | 0.17 - 0.37 | 0.25 - 0.5 | max 0.3 | max 0.025 | max 0.03 | 2.8 - 3.3 | 0.35 - 0.55 | 0.3 - 0.5 | 0.6 - 0.85 | max 0.2 |
Temperature of critical points for grade 20Kh3MVF ( 20Х3МВФ ).
| Ac1 = 800 - 830 , Ac3(Acm) = 900 - 950 , Ar3(Arcm) = 790 - 800 , Ar1 = 680 - 700 |
Mechanical properties under Т=20oС for grade 20Kh3MVF ( 20Х3МВФ )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar, band, GOST 20072-74 | longitudinal | 880 | 735 | 12 | 40 | 590 | Guenching 1030 - 1060oC, oil, Drawing 660 - 700oC, | |
| Arbor, rotor | longitudinal | 750 | 650 | 13 | 40 | 500 | Guenching 1030 - 1060oC, oil, Drawing 660 - 700oC, | |
| Arbor, rotor | tangent | 730 | 620 | 11 | 32 | 400 | Guenching 1030 - 1060oC, oil, Drawing 660 - 700oC, |
| Brinell hardness for 20Kh3MVF ( 20Х3МВФ ) (hot-rolled, annealing) , GOST 20072-74 | HB 10 -1 = 269 MPa |
Technological properties for grade 20Kh3MVF ( 20Х3МВФ )
| Weldability: | limited weldability. |
Physical properties for grade 20Kh3MVF ( 20Х3МВФ )
| 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 | 2.07 | 38.5 | 7800 | |||
| 100 | 2.04 | 10.6 | 35.6 | 502 | 398 | |
| 200 | 2 | 11.5 | 33.1 | 560 | 465 | |
| 300 | 1.93 | 11.8 | 31.4 | 610 | 544 | |
| 400 | 1.86 | 12.1 | 30.6 | 7690 | 650 | 640 |
| 500 | 1.82 | 12.6 | 29.7 | 7660 | 710 | 743 |
| 600 | 1.77 | 13 | 29.3 | 7620 | 750 | 859 |
| 700 | 1.71 | 28.9 | 982 | |||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Types of delivery of grade 20Kh3MVF ( 20Х3МВФ )
| 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 |
20Kh3MVF ( 20Х3МВФ ) - Relaxation-resistant steel: chemical composition, mechanical and physical properties, hardness
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