Duriron

Duriron Duromer Durometer hardness test Duroquin Duro Sup er Glue Duro-Tak... 

In Jiltemative 3 (Fig. 3), the electrolysis may be operated on a semicontinuous basis with the cadmium eventually being stripped completely from the electrolyte, which is then discarded after suitable treatment. Instead of the usual silver—lead anodes, high siUcon-iron anodes, such as Duriron, are commonly used. 

Higli-Silicon Iron Duriron is a high-silicon iron containing approximately 14.5 percent silicon and 0.85 percent carbon. Duri-chlor is a special high-silicon iron containing appreciable amounts of molybdenum. 

Table 10-30 lists sizes 1 to 12 in, and larger sizes can be obtained. Bell-and-spigot pipe is produced in the weights and dimensions shown in Table 10-30 fittings are available. New hubless pipe utilizing TFE gaskets and stainless steel clamps to make a mechanical joint are now available (the trade name is Duriron MJ). 

Fig. 3.64 Variation of corrosion rate with concentration of boiling sulphuric acid (Duriron...

Dowmeial H Duracid Duranalium Duranickel Durichlor Durimel 20 Duriron Elcomci K... 

Trauzl Test. 127% of PA Velocity of Detonation. 6165m/sec as detd in a glass tube 15/16 diam and 1/32 wall thickness vs 621Qm/sec for straight Nitromethane PLX corroded brass, but did not affect stainless steel, mild steel, or duriron Ref Anon, EngrDesHndbk, Explosives Series, Properties of Explosives of Military Interest , AMCP 706-177 (1971), 298... 

Although silicon compounds have been used since the earliest times, the element was not obtainable until advances in technology came about. Minerals containing silicon include sand and silicates that are widely distributed (silicon constitutes approximately 23% of the earth s crust), and they have been used in making glass, pottery, and mortar for many centuries. In addition to these uses, silicon is now highly purified for use in integrated circuits (chips) and as an alloy known as Duriron that has many uses. Silicon has the diamond structure with a density of 2.3 g/cm3. 

Duriron, corrosion resistance of, 23 785 Durran s method, 10 387 Durum wheat, 26 278 milling of, 26 282 Dust(s), 3 697... 

High-Silicon Iron Pipe and fittings are cast products of material typicmly conforming to ASTM A518. Nominal silicon content is 14.5 percent, and nominal carbon content is approximately 0.85 percent. This material is corrosion-resistant to most chemicals, highly abrasion-resistant, and suitable for applications to 260°C (500°F). Applications are primarily gravity drain. Pipe and fittings are available under the trade name Duriron . 

Modification of the metal itself, by alloying for corrosion resistance, or substitution of a more corrosion-resistant metal, is often worth the increased capital cost. Titanium has excellent corrosion resistance, even when not alloyed, because of its tough natural oxide film, but it is presently rather expensive for routine use (e.g., in chemical process equipment), unless the increased capital cost is a secondary consideration. Iron is almost twice as dense as titanium, which may influence the choice of metal on structural grounds, but it can be alloyed with 11% or more chromium for corrosion resistance (stainless steels, Section 16.8) or, for resistance to acid attack, with an element such as silicon or molybdenum that will give a film of an acidic oxide (SiC>2 and M0O3, the anhydrides of silicic and molybdic acids) on the metal surface. Silicon, however, tends to make steel brittle. Nevertheless, the proprietary alloys Duriron (14.5% Si, 0.95% C) and Durichlor (14.5% Si, 3% Mo) are very serviceable for chemical engineering operations involving acids. Molybdenum also confers special acid and chloride resistant properties on type 316 stainless steel. Metals that rely on oxide films for corrosion resistance should, of course, be used only in Eh conditions under which passivity can be maintained. 

Durco. A series of cast alloys (manufd by the Duriron Co) which are resistant ft) acids and other corrosive liquids Ref CondChemDict (1961), p426... 

Durichlor. A ferrous cast alloy, manufd by the Duriron Co. It contains besides iron, 14.5% Si, 0.85% c, 0.65% Mn 3.0% Mo and is similar to Duriron in corrosive resistance. In addn it gives excellent resistance to hydrochloric acid and corrosive chloride salts... 

Durimet-20. A ferrous alloy in cast or wrought forms manufd by the Duriron Co. 

Figure 11. Materials samples after exposure to boiling 97.7 w/o sulfuric acid at 411° C left, after 250 hr right, after 500 hr. CB 3 = Cartech Type 20CB 3 SiC = chemical vapor deposited silcon carbide Duriron = Duriron.

Silicon was discovered by Berzelius in 1824. Although knowledge of the element itself is fairly recent, compounds of silicon have been known for thousands of years. For example, pottery, brick, ceramics, and glass are made of silicates that are naturally occurring materials. In addition to these uses of silicates, highly purified elemental silicon is used in the manufacture of integrated circuits or chips that are used in the electronics industry. It is also alloyed with iron to make Duriron (Fe, 84.3% Si, 14.5% Mn, 0.35% and C, 0.85%), an alloy that resists attack by acids. This alloy is used in the manufacture of drainpipes and the cores of electric motors. 

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