| Grade : | 18KH12VMBFR ( 18Х12ВМБФР ) ( 2Х12ВМБФР ЭИ993 ) |
| Classification : | High alloy high-temperature steel |
| Equivalent grades: | Is absent |
Chemical composition in % for grade 18KH12VMBFR ( 18Х12ВМБФР )
| C | Si | Mn | Ni | S | P | Cr | Mo | W | V | Nb | B |
| 0.15 - 0.22 | max 0.5 | max 0.5 | max 0.06 | max 0.025 | max 0.03 | 11 - 13 | 0.4 - 0.6 | 0.4 - 0.7 | 0.15 - 0.18 | 0.2 - 0.4 | max 0.003 |
Temperature of critical points for grade 18KH12VMBFR ( 18Х12ВМБФР ).
| Ac1 = 850 , Ac3(Acm) = 930 |
Mechanical properties under Т=20oС for grade 18KH12VMBFR ( 18Х12ВМБФР )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Pipe | Ø 30 x 6 | dihedral | 820 | 640 | 17 | 56 | 900 | Normalizing 1050oC,Cooling air, Drawing 750oC, 3h,Cooling air, |
| Pipe | Ø 219 x 27 | dihedral | 750 | 590 | 15 | 43 | 400 | Normalizing 1050oC,Cooling air, Drawing 750oC, 3h,Cooling air, |
| Bar, GOST 5949-75 | Ø 60 | 740 | 490 | 12 | 45 | 390 | Guenching and drawing |
| Brinell hardness for 18KH12VMBFR ( 18Х12ВМБФР ) (annealing) , Bar GOST 5949-75 | HB 10 -1 = 229 MPa |
Technological properties for grade 18KH12VMBFR ( 18Х12ВМБФР )
| Weldability: | is not used. |
Physical properties for grade 18KH12VMBFR ( 18Х12ВМБФР )
| 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 | 2.28 | 27.6 | 7850 | |||
| 100 | 11.15 | 21.8 | ||||
| 200 | 2.15 | 11.13 | 24 | |||
| 300 | 2.09 | 11.42 | 25.1 | |||
| 400 | 1.95 | 11.8 | 26.3 | |||
| 500 | 1.88 | 12 | 27.2 | |||
| 600 | 1.73 | 12.5 | 28 | |||
| 700 | 1.55 | 12.65 | 28.9 | |||
| 800 | 11.6 | |||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Types of delivery of grade 18KH12VMBFR ( 18Х12ВМБФР )
| 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 |
18KH12VMBFR ( 18Х12ВМБФР ) - High alloy high-temperature steel: chemical composition, mechanical and physical properties, hardness
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