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Grade : | 12MKh ( 12МХ ) |
Classification : | Low alloy high-temperature steel |
Equivalent grades: | Go here |
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 |
Ac1 = 723 , Ac3(Acm) = 885 , Ar3(Arcm) = 803 , Ar1 = 715 |
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 |
Weldability: | without limitations. |
Flakes : | predisposed |
Temper brittleness: | not predisposed |
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 |
USA | Germany | Japan | France | England | European | Sweden | ||||||||||||
- | DIN,WNr | JIS | AFNOR | BS | EN | SS | ||||||||||||
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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 |
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 |
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