| Grade : | 38Kh2MYuА ( 38Х2МЮА ) ( 38ХМЮА ) |
| Substitute: | 38Х2ЮА, 38ХВФЮ, 20Х3МВФ. 38Х2Ю |
| Classification : | Relaxation-resistant steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 38Kh2MYuА ( 38Х2МЮА )
| C | Si | Mn | Ni | S | P | Cr | Mo | Al | Cu |
| 0.35 - 0.42 | 0.2 - 0.45 | 0.3 - 0.6 | max 0.3 | max 0.025 | max 0.025 | 1.35 - 1.65 | 0.15 - 0.25 | 0.7 - 1.1 | max 0.3 |
Temperature of critical points for grade 38Kh2MYuА ( 38Х2МЮА ).
| Ac1 = 800 , Ac3(Acm) = 940 , Ar1 = 730 |
Mechanical properties under Т=20oС for grade 38Kh2MYuА ( 38Х2МЮА )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Pipe, GOST 21729-76 | 392 | 20 | ||||||
| Bar, GOST 4543-71 | Ø 30 | 980 | 835 | 14 | 50 | 880 | Guenching and drawing |
| Brinell hardness for 38Kh2MYuА ( 38Х2МЮА ) (annealing) , GOST 4543-71 | HB 10 -1 = 229 MPa |
| Brinell hardness for 38Kh2MYuА ( 38Х2МЮА ) (cold-worked) , GOST 4543-71 | HB 10 -1 = 255 MPa |
Technological properties for grade 38Kh2MYuА ( 38Х2МЮА )
| Weldability: | is not used. |
| Flakes : | predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade 38Kh2MYuА ( 38Х2МЮА )
| 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 | 2.09 | 33 | 7710 | |||
| 100 | 2.02 | 11.5 | 33 | 496 | ||
| 200 | 1.94 | 11.8 | 32 | 517 | ||
| 300 | 1.9 | 12.7 | 31 | 533 | ||
| 400 | 1.81 | 13.4 | 20 | 546 | ||
| 500 | 1.74 | 13.9 | 20 | 575 | ||
| 600 | 1.62 | 14.7 | 28 | 609 | ||
| 700 | 1.47 | 14.9 | 27 | 638 | ||
| 800 | 1.37 | 27 | 676 | |||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 38Kh2MYuА ( 38Х2МЮА )
| USA | Germany | Japan | France | England | European | Italy | Spain | China | Sweden | Poland | Czechia | South Korea | ||||||||||||||||||
| - | DIN,WNr | JIS | AFNOR | BS | EN | UNI | UNE | GB | SS | PN | CSN | KS | ||||||||||||||||||
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Types of delivery of grade 38Kh2MYuА ( 38Х2МЮА )
| B03 - Metal forming treatment. Forgings |
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| В32 - Graded and shaped rolling |
| 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 |
38Kh2MYuА ( 38Х2МЮА ) - Relaxation-resistant steel: chemical composition, mechanical and physical properties, hardness
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