| Grade : | 12MKh ( 12МХ ) |
| Classification : | Low alloy high-temperature steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 12MKh ( 12МХ )
| C | Si | Mn | Ni | S | P | Cr | Mo | W | V | Ti | Cu |
| 0.09 - 0.16 | 0.17 - 0.37 | 0.4 - 0.7 | max 0.3 | max 0.025 | max 0.03 | 0.4 - 0.7 | 0.4 - 0.6 | max 0.2 | max 0.05 | max 0.03 | max 0.2 |
Temperature of critical points for grade 12MKh ( 12МХ ).
| Ac1 = 723 , Ac3(Acm) = 885 , Ar3(Arcm) = 803 , Ar1 = 715 |
Mechanical properties under Т=20oС for grade 12MKh ( 12МХ )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Pipe hot strain, GOST 550-75 | 412 | 245 | 21 | 45 | 690 | |||
| Bar, GOST 20072-74 | Ø 90 | 410 | 235 | 21 | 45 | 590 | Normalizing 910 - 930oC, air, Drawing 670 - 690oC, |
| Brinell hardness for 12MKh ( 12МХ ) (quenching, tempering) , | HB 10 -1 = 182 MPa |
| Brinell hardness for 12MKh ( 12МХ ) (hot-rolled, annealing) , GOST 20072-74 | HB 10 -1 = 217 MPa |
| Brinell hardness for 12MKh ( 12МХ ) , Pipe GOST 550-75 | HB 10 -1 = 156 MPa |
Technological properties for grade 12MKh ( 12МХ )
| Weldability: | without limitations. |
| Flakes : | predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade 12MKh ( 12МХ )
| 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 | 2.06 | 11.2 | 50 | 7830 | 473 | 240 |
| 200 | 2 | 12.5 | 50 | 7800 | 519 | 330 |
| 300 | 1.95 | 12.7 | 50 | 7760 | 565 | 410 |
| 400 | 1.89 | 12.9 | 49 | 7730 | 594 | 540 |
| 500 | 1.79 | 13.2 | 47 | 7690 | 653 | 640 |
| 600 | 1.7 | 13.5 | 46 | 7650 | 733 | 740 |
| 700 | 1.6 | 13.8 | 44 | 7610 | 888 | 900 |
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 12MKh ( 12МХ )
| USA | Germany | Japan | France | England | European | Sweden | ||||||||||||
| - | DIN,WNr | JIS | AFNOR | BS | EN | SS | ||||||||||||
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Types of delivery of grade 12MKh ( 12МХ )
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| В32 - Graded and shaped rolling |
| B33 - Sheets and Strips |
| В62 - Steel pipes and connecting parts to them |
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 |
12MKh ( 12МХ ) - Low alloy high-temperature steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys
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