| Grade : | 20G ( 20Г ) |
| Substitute: | 20, 30Г |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 20G ( 20Г )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.17 - 0.24 | 0.17 - 0.37 | 0.7 - 1 | max 0.3 | max 0.035 | max 0.035 | max 0.3 | max 0.3 |
Temperature of critical points for grade 20G ( 20Г ).
| Ac1 = 723 , Ac3(Acm) = 830 , Ar3(Arcm) = 830 , Ar1 = 680 , Mn = 420 |
Mechanical properties under Т=20oС for grade 20G ( 20Г )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar, GOST 4543-71 | Ø 25 | 450 | 275 | 24 | 50 | Normalizing 880oC, air, | ||
| Sheet trick, GOST 1577-93 | 440 | 27 | Normalizing | |||||
| Sheet trick, GOST 1577-93 | 400 | 28 | Annealing |
| Brinell hardness for 20G ( 20Г ) (annealing) , GOST 4543-71 | HB 10 -1 = 179 MPa |
| Brinell hardness for 20G ( 20Г ) (normalize) , Sheet trick GOST 1577-93 | HB 10 -1 = 197 MPa |
Technological properties for grade 20G ( 20Г )
| Weldability: | without limitations. |
| Flakes : | not predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade 20G ( 20Г )
| 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 | 2.04 | 7820 | ||||
| 100 | 12.5 | 78 | ||||
| 200 | 13.4 | 67 | 525 | |||
| 300 | 14.4 | 48 | ||||
| 400 | 15.1 | 554 | ||||
| 500 | ||||||
| 600 | 15.2 | 689 | ||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 20G ( 20Г )
| USA | Germany | Japan | France | England | European | China | Bulgaria | Poland | Czechia | |||||||||||||||||
| - | DIN,WNr | JIS | AFNOR | BS | EN | GB | BDS | PN | CSN | |||||||||||||||||
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Types of delivery of grade 20G ( 20Г )
| 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 |
20G ( 20Г ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
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