| Grade : | А12 ( А12 ) |
| Substitute: | А20 |
| Classification : | Rolled steel of improved and high cutting machinability |
| Equivalent grades: | Go here |
Chemical composition in % for grade А12 ( А12 )
| C | Si | Mn | S | P | Cu |
| 0.08 - 0.16 | 0.15 - 0.35 | 0.7 - 1.1 | 0.08 - 0.2 | 0.08 - 0.15 | max 0.25 |
Temperature of critical points for grade А12 ( А12 ).
| Ac1 = 735 , Ac3(Acm) = 866 , Ar3(Arcm) = 840 , Ar1 = 685 |
Mechanical properties under Т=20oС for grade А12 ( А12 )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Rolled stock hotrolled, GOST 1414-75 | 410 | 22 | 34 | |||||
| Rolled stock, GOST 1414-75 | 460-510 | 7 |
| Brinell hardness for А12 ( А12 ) , Rolled stock GOST 1414-75 | HB 10 -1 = 160 MPa |
| Brinell hardness for А12 ( А12 ) , Rolled stock GOST 1414-75 | HB 10 -1 = 217 MPa |
Technological properties for grade А12 ( А12 )
| Weldability: | is not used. |
| Flakes : | predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade А12 ( А12 )
| 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 | 1.98 | 7830 | ||||
| 100 | 1.83 | 11.9 | 78 | 470 | ||
| 200 | 12.5 | 67 | ||||
| 300 | 1.66 | 479 | ||||
| 400 | 13.6 | 517 | ||||
| 500 | 14.2 | |||||
| 600 | 571 | |||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade А12 ( А12 )
| USA | Germany | Japan | France | England | European | Italy | Spain | China | Sweden | Bulgaria | Poland | Romania | Czechia | |||||||||||||||||||||||||||||
| - | DIN,WNr | JIS | AFNOR | BS | EN | UNI | UNE | GB | SS | BDS | PN | STAS | CSN | |||||||||||||||||||||||||||||
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Types of delivery of grade А12 ( А12 )
| В22 - Graded and shaped rolling |
| 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 |
А12 ( А12 ) - Rolled steel of improved and high cutting machinability: 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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