| Grade : | 30KH ( 30Х ) |
| Substitute: | 30ХРА, 35Х, 35ХРА |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 30KH ( 30Х )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.24 - 0.32 | 0.17 - 0.37 | 0.5 - 0.8 | max 0.3 | max 0.035 | max 0.035 | 0.8 - 1.1 | max 0.3 |
Temperature of critical points for grade 30KH ( 30Х ).
| Ac1 = 740 , Ac3(Acm) = 815 , Ar1 = 670 |
Mechanical properties under Т=20oС for grade 30KH ( 30Х )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| , GOST 4543-71 | 880 | 685 | 12 | 45 | 690 | Guenching and drawing |
| Brinell hardness for 30KH ( 30Х ) (annealing) , GOST 4543-71 | HB 10 -1 = 187 MPa |
| Brinell hardness for 30KH ( 30Х ) (cold-worked) , GOST 4543-71 | HB 10 -1 = 241 MPa |
| Brinell hardness for 30KH ( 30Х ) , Bar GOST 10702-78 | HB 10 -1 = 170 MPa |
Technological properties for grade 30KH ( 30Х )
| Weldability: | limited weldability. |
| Flakes : | predisposed |
| Temper brittleness: | predisposed |
Physical properties for grade 30KH ( 30Х )
| 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 | 2.08 | 7820 | 210 | |||
| 100 | 2.11 | 12.4 | 46.5 | 7800 | 482 | 259 |
| 200 | 12.9 | 44.4 | 7770 | 496 | 330 | |
| 300 | 1.97 | 13.3 | 42.3 | 7740 | 513 | 417 |
| 400 | 13.8 | 38.5 | 7700 | 532 | 517 | |
| 500 | 1.75 | 14.1 | 35.6 | 7670 | 555 | 636 |
| 600 | 14.5 | 31.9 | 7630 | 583 | 778 | |
| 700 | 14.8 | 28.8 | 7590 | 620 | 934 | |
| 800 | 26 | 7610 | 703 | 1106 | ||
| 900 | 26.7 | 7560 | 687 | 1146 | ||
| 1100 | 7470 | 670 | 1205 | |||
| 1200 | 7430 | 670 | 1230 | |||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 30KH ( 30Х )
| USA | Germany | Japan | France | England | European | Italy | Spain | China | Bulgaria | Poland | |||||||||||||||||||||||||
| - | DIN,WNr | JIS | AFNOR | BS | EN | UNI | UNE | GB | BDS | PN | |||||||||||||||||||||||||
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Types of delivery of grade 30KH ( 30Х )
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| В32 - Graded and shaped rolling |
| B33 - Sheets and Strips |
| 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 |
30KH ( 30Х ) - 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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