Density and specific heat of spring and spring steel. Physical and mechanical properties.
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Requirements for spring-spring steels
- Elevated values of the elastic limit
- Sufficient plasticity (not lower than 4… 8%), especially with the predominance of dynamic and alternating loads;
- The ability to harden by heat treatment.
- Increased hardenability.
Doping
A characteristic feature of the chemical composition of such steels is an increased percentage of carbon up to 0.5… 0.85%, and for large springs — and silicon, up to 1.5… 2.0%. An additional increase in durability and durability is achieved by alloying with chromium and vanadium. Conventional high-carbon steels, in particular brand 65, are used only in the manufacture of sparse springs. Spring-spring alloys, in which there is also vanadium (50ХФА, 50ХГФ, etc.) differ in high viscosity and increased endurance limit. Springs from such steels are used in particularly difficult operating conditions.
Heat treatment
Quenching in oil followed by medium-temperature tempering accelerates the formation of troostite (finely dispersed perlite) in the structure; Medium-temperature tempering to ensure proper plastic characteristics. Supplier Avlob offers to buy spring and spring steel at a bargain price. The price is the best in this segment of rental.
Technical specifications
| Brand alloy | Yield strength, MPa | Limit of time resistance, MPa | Relative extension, % | Relative narrowing of the cross-section,% | Impact strength, kgm / m2 | Heat treatment mode |
| 60C2 | 1150 | 1300 | 11… 13 | 32… 33 | 2.5 | Tempering from 820… 8400 C into oil, then — tempering at 5500 C |
| 50HFA | 875 | 960 | 22 | 62 | 4,5 | Tempering from 850… 8600 C into oil, then — tempering at 6400 C |
Stamps 60С2 and 70С3А are usually used for the manufacture of springs and springs of small sizes: not more than 16… 18 mm. During heating for quenching, these steels show a tendency to increase the grain size, and burning out carbon reduces the endurance limit. For the manufacture of a larger spring, with increased performance, the 60C2XA grade, alloyed with chromium, is suitable. However, the plasticity of this steel is limited, which creates difficulties with deformation of the initial blanks.
Delivery, price
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