| Grade : | 20KH ( 20Х ) |
| Substitute: | 15Х, 20ХН, 12ХН2, 18ХГТ |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 20KH ( 20Х )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.17 - 0.23 | 0.17 - 0.37 | 0.5 - 0.8 | max 0.3 | max 0.035 | max 0.035 | 0.7 - 1 | max 0.3 |
Temperature of critical points for grade 20KH ( 20Х ).
| Ac1 = 750 , Ac3(Acm) = 825 , Ar3(Arcm) = 755 , Ar1 = 665 , Mn = 390 |
Mechanical properties under Т=20oС for grade 20KH ( 20Х )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Pipe, GOST 8731-87 | 431 | 16 | ||||||
| Bar, GOST 4543-71 | Ø 15 | 780 | 635 | 11 | 40 | 590 | Guenching and drawing |
| Brinell hardness for 20KH ( 20Х ) (annealing) , GOST 4543-71 | HB 10 -1 = 179 MPa |
| Brinell hardness for 20KH ( 20Х ) (cold-worked) , GOST 4543-71 | HB 10 -1 = 229 MPa |
| Brinell hardness for 20KH ( 20Х ) , Bar GOST 10702-78 | HB 10 -1 = 163 MPa |
Technological properties for grade 20KH ( 20Х )
| Weldability: | without limitations. |
| Flakes : | weakly predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade 20KH ( 20Х )
| 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 | 2.16 | 42 | 7830 | |||
| 100 | 2.13 | 10.5 | 42 | 7810 | 496 | |
| 200 | 1.98 | 11.6 | 41 | 7780 | 508 | |
| 300 | 1.93 | 12.4 | 40 | 525 | ||
| 400 | 1.81 | 13.1 | 38 | 7710 | 537 | |
| 500 | 1.71 | 13.6 | 36 | 567 | ||
| 600 | 1.65 | 14 | 33 | 7640 | 588 | |
| 700 | 1.43 | 32 | 626 | |||
| 800 | 1.33 | 31 | 706 | |||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 20KH ( 20Х )
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| - | DIN,WNr | JIS | BS | EN | BDS | MSZ | PN | |||||||||||||||
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Types of delivery of grade 20KH ( 20Х )
| B03 - Metal forming treatment. Forgings |
| 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 |
| В71 - Low-carbon steel wire |
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 |
20KH ( 20Х ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
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