| Grade : | 18KHGT ( 18ХГТ ) |
| Substitute: | 30ХГТ, 25ХГТ, 12ХН3А, 12Х2Н4А, 20ХН2М, 14ХГСН2МА, 20ХГР |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 18KHGT ( 18ХГТ )
| C | Si | Mn | Ni | S | P | Cr | Ti | Cu |
| 0.17 - 0.23 | 0.17 - 0.37 | 0.8 - 1.1 | max 0.3 | max 0.035 | max 0.035 | 1 - 1.3 | 0.03 - 0.09 | max 0.3 |
Temperature of critical points for grade 18KHGT ( 18ХГТ ).
| Ac1 = 740 , Ac3(Acm) = 825 , Ar3(Arcm) = 730 , Ar1 = 650 , Mn = 360 |
Mechanical properties under Т=20oС for grade 18KHGT ( 18ХГТ )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar, GOST 4543-71 | 980 | 885 | 9 | 50 | 780 | Guenching and drawing | ||
| Steel | 5 | 1520 | 1320 | 12 | 50 | 720 | Guenching 850oC, oil, Drawing 200oC, air, | |
| Steel | 20 | 980 | 730 | 15 | 55 | 1130 | Guenching 850oC, oil, Drawing 200oC, air, |
| Brinell hardness for 18KHGT ( 18ХГТ ) (annealing) , GOST 4543-71 | HB 10 -1 = 217 MPa |
| Brinell hardness for 18KHGT ( 18ХГТ ) (cold-worked) , GOST 4543-71 | HB 10 -1 = 229 MPa |
Technological properties for grade 18KHGT ( 18ХГТ )
| Weldability: | without limitations. |
| Flakes : | not predisposed |
| Temper brittleness: | weakly predisposed |
Physical properties for grade 18KHGT ( 18ХГТ )
| 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 | 2.11 | 37 | 7800 | |||
| 100 | 2.05 | 10 | 38 | 495 | ||
| 200 | 1.97 | 11.5 | 38 | 508 | ||
| 300 | 1.91 | 12.3 | 37 | 525 | ||
| 400 | 1.76 | 12.8 | 35 | 537 | ||
| 500 | 1.68 | 13.3 | 34 | 567 | ||
| 600 | 1.55 | 13.6 | 31 | 588 | ||
| 700 | 1.36 | 30 | 626 | |||
| 800 | 1.29 | 29 | 705 | |||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 18KHGT ( 18ХГТ )
| Germany | France | China | Bulgaria | Poland | Romania | Czechia | ||||||||
| DIN,WNr | AFNOR | GB | BDS | PN | STAS | CSN | ||||||||
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Types of delivery of grade 18KHGT ( 18ХГТ )
| B03 - Metal forming treatment. Forgings |
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| В32 - Graded and shaped rolling |
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 |
18KHGT ( 18ХГТ ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
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