BILBAINA DE TRATAMIENTOS
Sursulf nitriding treatment is a salt bath, clean activated sulfur, which is conducted at a temperature of 565 + / -5 ° C . sursulf Using very effectively solves the problems of wear, fatigue, and corrosion gripaje often exhibit certain mechanical parts made of steel or cast iron, and because of its high potential nitriding also be used to increase hardness in times very short with significant advantages. p>
Regarding the appearance of the processed metal, the more increases the carbon content and the percentage of the substrate alloying elements, more compact and hard layers are composed, on the contrary, the average thickness decrease. In addition to the presence of active sulfur in the bathroom sursulf, is achieved for the same duration of treatment greater concentration of nitrogen in the upper sub-layer and total nitrogen penetration, which in a bathroom devoid of azufre.El process causes a slight increase as separate parts of its shape and placement in the course of treatment, this increase is variable depending on the nature of the treated part. Furthermore, as occurs in all treatments of its category, the sursulf tends to increase surface roughness of the parts treated with sursulf tratadas.Las parts may be supplemented with a bath consisting of alkali hydroxides, nitrates, carbonates and alkali strongly oxidizing called oxynit. p>
This bath operates at a temperature of 350-450 ° C, and in it, sulfur compounds, iron and residual part of the nitrides formed in the bath sursulf, transformed in “black iron oxide” (Fe O), which maintain the antiwear properties, anti-seizure and anti-fatigue parts confers greater resistance to corrosion. p>
DIAGRAM IRON – CARBON strong> br> br> p>
The steels used in industry, are alloys and not pure metals like gold, silver etc.De its many components, the element iron is the highest percentage, and carbon which has a more decisive influence on their properties, characteristics and treatments.The carbon content of steels varies from 0.035% to 2.5%.
We could say that in essence the steels can be considered as iron – carbon alloys with added impurities.
In ordinary steels such impurities are usually:
In loa special steels, “impurities”, often intentionally added:
– Woldframio, etc. ..
Coming to significantly modify the properties of these steels.
We begin the study by ordinary iron alloys – carbon.
Generally the carbon is combined with iron to form iron carbide, cementite containing 6.66% of C.