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Special materials

for special applications

As experts in corrosion and wear resistant materials we offer process and media-specific solutions. We will select the right material for your conveyance requirement and will ensure minimum wear during long operational life – even when handling difficult media.

Plastics
In pump engineering the non-metallic materials which are mainly used, are predominantly fluoropolymers and polyolefins. The advantage of these materials is their high resistance to acids and alkalis at low to medium temperatures. To resist external forces these pump types are usually protected by a metal casing.
Mineral casting/ composite material
Polymercarbide

A corrosion- and wear-resistant material that promises significantly longer service life and thus lower life cycle costs than conventional materials in pump construction, especially in chemically aggressive media.

Fluorpolymere
Polyvinyliden-Fluoride PVDF

PVDF is characterized by its excellent general corrosion resistance, high resistance to stress cracking and good UV resistance. Its usable temperature range is between -20 °C and 130 °C. The material is especially suitable for pumping hydrofluoric acid of all concentrations up to boiling point, liquids containing halogen, nitric acid/hydrofluoric acid pickles and for the evaporation of spent hydrochloric acid.

Perfluoralkoxi PFA

PFA is a perfluorated alkyvinyl ether. Centrifugal pumps lined with PFA can be used up to 180 °C. With a few exceptions this material has a universal resistance to chemicals.

Polytetrafluorethylene PTFE

PTFE shows an outstandy resistance against nearly all organic and inorganic media over a wide temperature range. Centrifugal pumps made of PTFE can be used between -50 °C and 180 °C.

Polyolefins
Polypropylene PP

In many applications PP represents an economical alternative to high grade metallic materials. This material is suitable for pumping salt solutions, almost all dilute alkalis and acids and is also frequently used in hydrochloric acid pickling solutions. It can be used for working temperatures between 0 °C and 100 °C.

Polyethylen PE 1000 UHMW-PE

Only ultra high molecular weight low pressure polyethylene is used. Its usable temperature range is between -50 °C and 80 °C. Its general corrosion resistance exceeds that of PP in some cases. Due to its very good wear resistance, centrifugal pumps made of PE are very often used in media that are both corrosive and abrasive, such as in flue gas cleaning.

Polyethylene PE 1000 R

PE 1000R is a further development of the standard polyethylene PE 1000 with wear-minimizing additives for up to 20% higher resistance - for use in highly abrasive suspensions with process-related critical solids content. The material can be used at temperatures from -20 °C to +80 °C.

Metal
The range of metallic materials encom-passes a wide variety of very different types of material which are distinguished mainly by their alloy composition, their structure and their manufacturing process. This gives each material its characteristic properties and allows an optimal material to be selected to suit the application.
Cast Iron and Cast Steel
Ferritic cast steel 1.0619

High temperature ferritic cast steel, can be used up to 450 °C. For use with low or non-corrosive media, such as molten sulphur.

Ferritic cast steel 1.7357

High temperature ferritic cast steel, can be used up to 450 °C. The most frequent application is the pumping of molten salts.

High Alloy Cast Steel V5700 (0.9650)

Particularly wear resistant high alloy cast iron. This material is used for suspensions with an abrasive effect such as gypsum, carbonates, carbides. sand, ore or metal oxides.

High Alloy Cast Steel
Ferritic stainless steel 1.4136S

Corrosion and erosion resistant high alloy ferritic cast steel. Typical applications are highly concentrated sulphuric acid up to 180 °C, oleum, fertilizer production, crude and solid phosphoric acid.

Ferritic stainless steel RHRS

Corrosion and erosion resistant high alloy ferritic cast steel. Typical applications are highly concentrated sulphuric acid up to 180 °C, oleum, fertilizer production, crude and solid phosphoric acid.

Austenitic stainless steel RHSX

Special high-alloyed material with excellent resistance to erosion-corrosion for pumps operating in the dryer-, intermediate- and end-absorber stage of sulphuric acid plants up to temperatures of 150 °C.

Austenitic stainless steel 1.4306S

High-quality, molybdenum-free material suitable for applications such as pumping of ammonium nitrate melt, hot nitric acid at medium concentrations and also the vaporization of waste nitric acid.

Austenitic stainless steel 1.4361

Low carbon silicon alloy material for pumping strongly oxidising media. Particularly suitable for hot highly concentrated nitric acid, e.g. 98% HNO3.

Austenitic stainless steel 1.4408

Austenitic chromium nickel molybdenum steel with a good general resistance to corrosion. These materials are suitable for pumping almost all organic liquids, 50% caustic soda up to 90 °C, KTL paint, pure phosphoric acid, dry chlorine, liquid sulphur, PTA and many other media.

Austenitic stainless steel 1.4581

Austenitic chromium nickel molybdenum steel with a good general resistance to corrosion. These materials are suitable for pumping almost all organic liquids, 50% caustic soda up to 90 °C, KTL paint, pure phosphoric acid, dry chlorine, liquid sulphur, PTA and many other media.

Semi-austenitic 1.4463

Semi-austenitic, easily welded material with an increased strength and a good general resistance to corrosion. Due to its good welding properties and wear resistance it is frequently used for jacketed pumps for handling melts containing solids, such as pitch and tar.

Duplex 1.4517

Duplex (semi-austenitic), molybdenum and copper alloyed material with a high resistance to pitting and stress corrosion. This material is one of the super duplex steels. lt can be used with crude phosphoric acid, containing solids at up to 100 °C, hot sea water, many solutions containing chloride, FGD suspensions and sulphuric acid at all concentrations at low temperatures.

Fully austenitic special stainless steel R3020

Fully austenitic special stainless steel with a high chromium and nickel content. High resistance to pitting, stress corrosion and intercrystalline corrosion. Suitable for 70% caustic soda up to 200 °C, sulphuric acid at all concentrations at low and medium temperatures, sulphuric acid pickling solutions, in certain areas of the manufacture of phosphoric acid, for pumping solutions with a high chloride content and in spin baths.

High austenitic stainless steel 1.4529S

High-quality, fully austenitic cast material with high resistance in chloride-rich, acidic and solid media. Use in REA absorber and quencher liquids, for acidic and chloride-containing gypsum sludge, in phosphoric acid production, in evaporation and crystallization processes as well as in hot sea water.

Higher austenitic stainless steel 1.4652S

Higher austenitic cast material with very high corrosion resistance. Especially in very corrosive phosphoric acid with solids this material is perfectly suitable.

Silicon Iron Alloys
SIGUSS

Highly corrosion resistant chromium alloy silicon cast iron with a good resistance to wear and increased chemical resistance. This material is chemically resistant to H2SO4 at all concentrations up to boiling point, therefore for all sulphuric acid applications including the evaporation of waste sulphuric acid, Siguss is virtually indispensable.

Nickel Based Materials
Alloy C1 (2.4686)

Highly resistant nickel-base alloy for special applications such as liquids containing high chloride, hydrochloric acid, FGD liquids, very heavily contaminated phosphoric acid, hypochlorites and solutions with oxidising chlorides.

Alloy C22 (2.4602)

Highly resistant nickel-base alloy for special applications such as liquids containing high chloride, hydrochloric acid, FGD liquids, very heavily contaminated phosphoric acid, hypochlorites and solutions with oxidising chlorides.

Alloy B1 (2.4685)

Highly resistant nickel-base alloy for special applications such as liquids containing high chloride, hydrochloric acid, FGD liquids, very heavily contaminated phosphoric acid, hypochlorites and solutions with oxidising chlorides.

Pure Metals
Titan (3.7031)

Titanium is especially resistant to heavily oxidising and chloride containing media. The material is preferred for use in chloralkali-electrolysis, for pumping bleaching solutions containing chlorine and in the manufacture of acetic acid.

Titan Pd (3.7032)

Titanium alloyed with palladium. This improves the corrosion resistance in reducing media, e.g. in solutions of iron chloride or aluminium chloride containing hydrochloric acid.

Nickel (RH Ni 98)

Nickel is mainly used for pumping molten alkalis, for the evaporation of alkalis and for pumping highly refined alkalis which must not be contaminated with iron ions.

Ceramics
Pumps made of ceramic materials are particularly suitable for media which are highly abrasive and at the same time corrosive, where pumps made from metallic materials and plastics may have a relatively short operational life.

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