| Grade : | 30KHGS ( 30ХГС ) |
| Substitute: | 40ХФА, 35ХМ, 40ХН, 35ХГСА |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 30KHGS ( 30ХГС )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.28 - 0.35 | 0.9 - 1.2 | 0.8 - 1.1 | max 0.3 | max 0.035 | max 0.035 | 0.8 - 1.1 | max 0.3 |
Temperature of critical points for grade 30KHGS ( 30ХГС ).
| Ac1 = 760 , Ac3(Acm) = 830 , Ar3(Arcm) = 705 , Ar1 = 670 , Mn = 352 |
Mechanical properties under Т=20oС for grade 30KHGS ( 30ХГС )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Sheet annealed | 500-750 | 14 | ||||||
| Bar, GOST 4543-71 | Ø 25 | 1080 | 835 | 10 | 45 | 440 | Guenching 880oC, oil, Drawing 540oC, water, | |
| Steel | 40 | 930 | 820 | 12 | 51 | 690 | Guenching 880oC, oil, Drawing 600oC, water, | |
| Steel | 80 | 860 | 730 | 14 | 50 | 780 | Guenching 880oC, oil, Drawing 600oC, water, |
| Brinell hardness for 30KHGS ( 30ХГС ) (annealing) , GOST 4543-71 | HB 10 -1 = 229 MPa |
Technological properties for grade 30KHGS ( 30ХГС )
| Weldability: | limited weldability. |
| Flakes : | predisposed |
| Temper brittleness: | predisposed |
Physical properties for grade 30KHGS ( 30ХГС )
| 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 | 1.94 | 7850 | 210 | |||
| 100 | 1.85 | 12 | 37 | 7830 | 493 | |
| 200 | 1.73 | 12.5 | 41 | 7800 | 504 | |
| 300 | 1.69 | 12.9 | 38 | 7760 | 512 | |
| 400 | 1.66 | 13.2 | 37 | 7730 | 533 | |
| 500 | 1.56 | 13.6 | 36 | 7700 | 554 | |
| 600 | 13.9 | 35 | 7670 | 584 | ||
| 700 | 34 | 622 | ||||
| 800 | 32 | 693 | ||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 30KHGS ( 30ХГС )
| Bulgaria | Poland | Czechia | |||
| BDS | PN | CSN | |||
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Types of delivery of grade 30KHGS ( 30ХГС )
| 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 |
30KHGS ( 30ХГС ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
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