| Grade : | 20KH12VNMF ( 20Х12ВНМФ ) ( 2Х12ВНМФ ЭП428 ) |
| Classification : | High alloy high-temperature steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 20KH12VNMF ( 20Х12ВНМФ )
| C | Si | Mn | Ni | S | P | Cr | Mo | W | V |
| 0.17 - 0.23 | max 0.6 | 0.5 - 0.9 | 0.5 - 0.9 | max 0.025 | max 0.03 | 10.5 - 12.5 | 0.5 - 0.7 | 0.7 - 1.1 | 0.15 - 0.3 |
Temperature of critical points for grade 20KH12VNMF ( 20Х12ВНМФ ).
| Ac1 = 800 , Ac3(Acm) = 860 |
Mechanical properties under Т=20oС for grade 20KH12VNMF ( 20Х12ВНМФ )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar, GOST 5949-75 | 740 | 590 | 15 | 50 | 590 | Guenching 1010 - 1060oC, oil, Drawing 660 - 670oC, air, | ||
| Bar, GOST 18968-73 | 740 | 590-755 | 15 | 50 | 590 | Normalizing and drawing |
| Brinell hardness for 20KH12VNMF ( 20Х12ВНМФ ) (annealing) , Bar GOST 5949-75 | HB 10 -1 = 229 MPa |
| Brinell hardness for 20KH12VNMF ( 20Х12ВНМФ ) (normalize, tempering) , Bar GOST 18968-73 | HB 10 -1 = 229 - 269 MPa |
Technological properties for grade 20KH12VNMF ( 20Х12ВНМФ )
| Weldability: | hard weldability. |
Physical properties for grade 20KH12VNMF ( 20Х12ВНМФ )
| 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 | 2.12 | 7850 | ||||
| 100 | 2.07 | 10.6 | 25 | 7830 | ||
| 200 | 2.02 | 10.9 | 25 | 7800 | ||
| 300 | 1.96 | 11.2 | 26 | 7780 | ||
| 400 | 1.9 | 11.4 | 26 | 7760 | ||
| 500 | 1.81 | 11.7 | 27 | 7730 | ||
| 600 | 1.67 | 11.9 | 27 | 7700 | ||
| 700 | 12 | 7670 | ||||
| 800 | 12.1 | |||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 20KH12VNMF ( 20Х12ВНМФ )
| USA | Japan | ||
| - | JIS | ||
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Types of delivery of grade 20KH12VNMF ( 20Х12ВНМФ )
| 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 |
20KH12VNMF ( 20Х12ВНМФ ) - High alloy high-temperature steel: chemical composition, mechanical and physical properties, hardness
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