| Grade : | 70S3А ( 70С3А ) |
| Classification : | Spring structural steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 70S3А ( 70С3А )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.66 - 0.74 | 2.4 - 2.8 | 0.6 - 0.9 | max 0.25 | max 0.025 | max 0.025 | max 0.3 | max 0.2 |
Temperature of critical points for grade 70S3А ( 70С3А ).
| Ac1 = 765 , Ac3(Acm) = 780 , Mn = 270 |
Mechanical properties under Т=20oС for grade 70S3А ( 70С3А )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Rolled stock, GOST 14959-79 | 1670 | 1470 | 6 | 25 | Guenching 850oC, oil, Drawing 470oC, |
| Brinell hardness for 70S3А ( 70С3А ) (annealing) , GOST 14959-79 | HB 10 -1 = 269 MPa |
| Brinell hardness for 70S3А ( 70С3А ) (without heat treatment) , GOST 14959 | HB 10 -1 = 302 MPa |
Technological properties for grade 70S3А ( 70С3А )
| Weldability: | is not used. |
| Flakes : | not predisposed |
| Temper brittleness: | weakly predisposed |
Physical properties for grade 70S3А ( 70С3А )
| 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 | 2.14 | 25 | ||||
| 100 | 2.08 | 11.4 | 26 | 480 | ||
| 200 | 1.98 | 12.3 | 27 | 510 | ||
| 300 | 1.92 | 12.8 | 28 | 520 | ||
| 400 | 1.85 | 13.3 | 29 | 535 | ||
| 500 | 1.8 | 13.7 | 29 | 565 | ||
| 600 | 1.52 | 14.1 | 29 | 585 | ||
| 700 | 1.39 | 14.3 | 28 | 620 | ||
| 800 | 1.32 | 12.8 | 27 | 700 | ||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 70S3А ( 70С3А )
| Bulgaria | |
| BDS | |
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Types of delivery of grade 70S3А ( 70С3А )
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| В32 - Graded and shaped rolling |
| B33 - Sheets and Strips |
| В72 - Medium-high and high-carbon steel wire |
| B73 - Steel Alloy 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 |
70S3А ( 70С3А ) - Spring structural steel: chemical composition, mechanical and physical properties, hardness
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