Alloys and Wire Types

JSC Krastsvetmet uses only refined metals in alloys production to improve strength characteristics of the final products.

Platinum – 99.95%
Palladium – 99.95%
Rhodium – 99.95%

Pt/Rh – 95/5 Alloy is most preferable for obtain improved conversion efficiency, however, its strength characteristics are worse throughout the whole range of the alloys offered.

Pt/Rh – 92/8 Alloy has enhanced strength and sufficiently high conversion property.

Pt/Rh – 90/10 Alloy has maximum strength, as compared with the existing alloys, and special stability at high temperatures. It is used for hydroxylamine sulfates and cyanides production process.

Pt/Rh/Pd – 90/5/5 Alloy successfully combines good strength characteristics and high level of conversion property.

Pt/Pd/Rh – 81/16/3 Alloy is widely used at present; gauzes from this alloy type are installed the bottom of the pack; being equivalent to Pt/Pd/Rh/Ru– 81/15/3.5/0.5 Alloy it optimizes the costs of a catalyst pack.

As the basic types in catalyst gauze production three wire diameters, 60, 76 and 82 micron are proposed. To make the pack optimal any wire diameter in 50 – 92 micron range can be produced. Nominal tolerance is ±0.3 micron.

The maximum seamless gauze diameter to be produced is 2 300 mm. Gauzes of greater diameter will have a seam of 10-12 mm hammered in hydrogen flame. The gauzes are knitted with +5 mm to the total gauze diameter. The gauze’s edges are riveted over to avoid possible edge wire fragments fall-off and wide ribbed edges.

A polymer filament is applied to support gauze knitting; it is dissolved in acids and after washing the gauze is hydrogen flamed. This procedure activates the gauze; thus the gauze can be installed in the burner without additional chemical activation or heating treatment.