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Carbon Spring Steel
Seeger selects raw material based on its performance characteristics , such as a high modulus of elasticity, high yield point, high elastic elongation and good hardening abilities; which are best achieved by spring steels in accordance with DIN 17222. The material C75S, material No. 1.1248 is a good example. This is a high-purity carbon spring steel with a low phosphorus and sulphur content. This material along with Mk 58, and spring steel wire in accordance with DIN 17223 are the primary steels used to manufacture Seeger retaining systems.
In addition to the above-mentioned carbon spring steels, corrosion-proof materials are also used. The following materials are also available to manufacture Seeger retaining rings:
As a hardenable martensitic chrome steel, this material does not have the resistance of austenitic chrome nickel steels, but it suffices for numerous applications and is used above all in the manufacture of smaller and medium-size rings.
This material is an austenitic corrosion-proof stainless steel which is particularly suitable for work hardening. Both Seeger rings to DIN 471/472 with dimensions of more than 100 mm nominal diameter (concentric form) and circlips SW/SB can be manufactured from this material.
All stainless steels are susceptible to specific types of corrosion which, in certain circumstances, may lead to sudden failure of the ring assembly due to brittle fracture. It is absolutely necessary to pay attention to the specific characteristics of these materials when used in conjunction with certain corrosive media. The risk of stress corrosion can be minimized by reducing the tension. Therefore the depths of the grooves should be designed in such a way that the rings are assembled with a minimum of pretension.
Although it has a high strength, this material has a lower elastic deformation than spring steel. Rings manufactured from this bronze therefore tend towards plastic deformations in the higher-stress smaller dimensions, although, a tight fit in the groove is almost always guaranteed. In comparison with spring steel, this material's lower modulus of elasticity (115000 N/mm2) results in a reduction in its load bearing capacity and its detaching speed. Tin bronze is however, antimagnetic and, even at low temperatures, shows no tendencies towards embrittlement.
- By isothermic conversion in the bainite phase, the desired structure is achieved by quenching in molten salt with the following advantages:
- extreme toughness and thus higher permanent strength and a reduced risk of hardening cracks and better elimination of stress peaks
- less distortion due to a smaller temperature difference
- less sensitivity to hydrogen embrittlement
- energy saving and cost saving in comparison with martensitic hardening, as the subsequent tempering is inapplicable.
Hydrogen Embrittlement: Both during the cleaning phase and also during the coating processes of galvanic treatment, hydrogen atoms may be absorbed. In certain circumstances, this may lead to a hydrogen-induced delayed brittle fracture. As a rule, the risk of brittle fracture is avoided in Seeger products by means of thorough degasification of the material after the galvanization process, but this risk cannot be excluded completely (see also DIN 267, part 9).
Mechanical plating: In a special process, zinc or tin particles, or mixtures of these, are hammered or impinged onto the ring in a drum by means of glass balls of a suitable size.
Products can be aluminized for elevated corrosion protection requirements, reduced coating thickness and visual considerations. The surface will have a uniform silver finish and the corrosion protection can be compared with best results of galvanized surfaces. There will also be no danger of parts sticking together as can occur with electrophoretic painting. The risk of hydrogen embrittlement is very low in comparison with galvanizing.