Free-machining steels

Silicon hydrides, in growing amorphous silicon, 22 129-131 Silicon integrated circuits, 19 167 Siliconized coatings, 10 108 Silicon-killed free-machining steels, 24 424 Silicon lattice, 23 35 Silicon-manganese-zirconium, 26 638 Silicon microelectronics, sensor sensitivity and, 22 269... 

The corrosion rate depends upon the steel composition surface condition and the angle of exposure. Increase in carbon, manganese and silicon content of the steel results in decrease in corrosion rate although if manganese is present as sulfide as in free-machining steels, corrosion resistance decreases. The presence of copper increases the corrosion resistance. 

A. J. DeArdo and C. I. Garcia, Tin-bearing free machining steel. United States Patent No. 5,961,747, October 5, 1999. 

Inhibitor Low-carbon steel Free machining steel FeS FeSj FeO Fe3 04... 

The case of free machining steels, as for instance the AISI303 standard, whose the sulfur content can reach 0.3% or more is worthy to mention since their improved machinabil-ity is generally paid by a poor corrosion resistance, with however the advantage to form... 

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