| Grade : | 58 ( 58 ) ( 55пп ) |
| Substitute: | 30ХГТ, 20ХГНТР, 20ХН2М, 12ХН3А, 18ХГТ |
| Classification : | High quality structural carbon steel |
| Equivalent grades: | Is absent |
Chemical composition in % for grade 58 ( 58 )
| C | Si | Mn | Ni | S | P | Cr | Cu | As |
| 0.55 - 0.63 | 0.1 - 0.3 | max 0.2 | max 0.3 | max 0.04 | max 0.035 | max 0.15 | max 0.3 | max 0.08 |
Temperature of critical points for grade 58 ( 58 ).
| Ac1 = 720 , Ac3(Acm) = 785 |
Mechanical properties under Т=20oС for grade 58 ( 58 )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Rolled stock, GOST 1050-88 | to 80 | 600 | 315 | 12 | 28 | Normalizing | ||
| Steel hotrolled | 130 | 600 | 300 | 10 | 25 | 350 | Normalizing |
| Brinell hardness for 58 ( 58 ) , Rolled stock GOST 1050-88 | HB 10 -1 = 255 MPa |
| Brinell hardness for 58 ( 58 ) , Rolled stock GOST 1050-88 | HB 10 -1 = 217 MPa |
Technological properties for grade 58 ( 58 )
| Weldability: | is not used. |
| Flakes : | not predisposed |
| Temper brittleness: | not predisposed |
Types of delivery of grade 58 ( 58 )
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| B24 - Ribbons |
| В32 - Graded and shaped rolling |
| B33 - Sheets and Strips |
| В62 - Steel pipes and connecting parts to them |
| В71 - Low-carbon steel wire |
| В72 - Medium-high and high-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 |
58 ( 58 ) - High quality structural carbon steel: chemical composition, mechanical and physical properties, hardness
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