| Grade : | 15KH ( 15Х ) |
| Substitute: | 20Х |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 15KH ( 15Х )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.12 - 0.18 | 0.17 - 0.37 | 0.4 - 0.7 | max 0.3 | max 0.035 | max 0.035 | 0.7 - 1 | max 0.3 |
Temperature of critical points for grade 15KH ( 15Х ).
| Ac1 = 766 , Ac3(Acm) = 838 , Ar3(Arcm) = 799 , Ar1 = 702 |
Mechanical properties under Т=20oС for grade 15KH ( 15Х )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Pipe cooling strain, GOST 8733-74 | 412 | 19 | ||||||
| Bar, GOST 4543-71 | Ø 15 | 690 | 490 | 12 | 45 | 690 | Guenching 880oC, water, Guenching 770 - 820oC, water, Drawing 180oC, air, | |
| Forging | to 100 | 390 | 195 | 26 | 55 | 590 | Normalizing | |
| Forging | 100 - 300 | 390 | 195 | 23 | 50 | 540 | Normalizing |
| Brinell hardness for 15KH ( 15Х ) (annealing) , GOST 4543-71 | HB 10 -1 = 179 MPa |
| Brinell hardness for 15KH ( 15Х ) (cold-worked) , GOST 4543-71 | HB 10 -1 = 217 MPa |
| Brinell hardness for 15KH ( 15Х ) , Pipe GOST 8733-74 | HB 10 -1 = 179 MPa |
| Brinell hardness for 15KH ( 15Х ) , Bar GOST 10702-78 | HB 10 -1 = 156 MPa |
Technological properties for grade 15KH ( 15Х )
| Weldability: | without limitations. |
| Flakes : | not predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade 15KH ( 15Х )
| 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 | 2.15 | 44 | 7830 | |||
| 100 | 2.12 | 10.2 | 44 | 7810 | 496 | |
| 200 | 1.94 | 11.5 | 43 | 7780 | 508 | |
| 300 | 1.91 | 12.4 | 41 | 525 | ||
| 400 | 1.79 | 13 | 39 | 7710 | 538 | |
| 500 | 1.7 | 13.5 | 36 | 567 | ||
| 600 | 1.62 | 14 | 33 | 7640 | 588 | |
| 700 | 1.42 | 32 | 626 | |||
| 800 | 1.32 | 32 | 706 | |||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 15KH ( 15Х )
| USA | Germany | Japan | France | England | European | Belgium | Spain | China | Bulgaria | Poland | Romania | Czechia | South Korea | ||||||||||||||||||||||||||||||||||||
| - | DIN,WNr | JIS | AFNOR | BS | EN | NBN | UNE | GB | BDS | PN | STAS | CSN | KS | ||||||||||||||||||||||||||||||||||||
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Types of delivery of grade 15KH ( 15Х )
| 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 |
| 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 |
15KH ( 15Х ) - Alloy structurall 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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