Material groups

Steel

Plain, low carbon steel (iron) with little resistance to corrosion under „normal“ environmental conditions. Haver & Boecker therefore offers woven wire cloth made from plain steel in galvanized, tinned or lacquered finish.

HAVER NIA-Steel

HAVER NIA-Steel is a spring steel with high carbon content and manganese elements. It is extremely resistant to abrasion and vibration and - at the same time - it is elastic. Therefore it is especially suitable for industrial screens.

Martensitic and Precipitation- hardening Stainless Steels

The materials named in the table show a feritic microstructure and are magnetic. Using special heat treatment they can be hardened in order to achieve a higher wear resistance and stability.

The chromium content of the alloy results in good corrosion resistance to „normal“ environment conditions.

Austenitic Stainless Steels

Stainless Steel is the most widely used material for our woven wire, covering most applications. These alloys show very good resistance

to corrosion under atmospheric conditions. Austenitic stainless steels are not resistant to high-temperature- oxidation. For high-temperature applications, when some discoloration of the surface can appear, i.e. over 450°C (842°F), heat resisting steels should preferably be used.

In cases where comparable corrosion properties are required with a higher strength, we recommend the material No. 1.4310. If the material is to be welded, we recommend austenitic stainless steels with a low carbon content or the material No. 1.4571, stabilized with titanium. Both show a sufficient resistance to intercrystaline corrosion. The material group 1.44.. contains molybdenum and has a higher resistance to chlorous media than the material group 1.43...

Austenitic-Ferritic Steels

So-called compound steels with very good corrosion resistance to sea- water. The alloy constituent molybde- num makes them resistant against pitting or selective corrosion. Compared to the austenitic alloys they have a high tensile strength, making them particularly suitable for applications of the chemical or petro- chemical industry.

Heat Resisting Steel and Heat Conducting Alloys

These steels are resistant to temperatures of up to 1,300°C (2,375°F) in air and show a good resistance to possible heat waste. The coat of aluminium-oxide that forms on the wire surface makes them especially suitable for applications in air. The use of ferritic steels in aggressive or sulphurous surroundings is not recommended. For such applications austenitic heat resisting steels should be used as they show a better resistance to high-temperature- corrosion.

Copper and Copper based Alloys

Copper displays good conducting properties for heat and electricity. It is highly resistant in the atmosphere as well as in sea-water. The corrosion resistance to cyanides, halogenides and ammonia however is poor. Copper-tin alloys (Phosphor Bronze) are largely wear and tear resistant and show good emergency running properties. This property is important in bearings.

Copper-zinc alloys (Brass) are particu- larly suitable for sieving and filtration purposes. It is important that the material does not come into contact with ammonia (NH3), because it may be destroyed by crevice corrosion.

Nickel and Nickel based Alloys

Nickel is resistant to a number of corroding media such as halogenides, caustic alkalines and many organic compounds. It shows good magnetic-, electrical- and heat conducting pro- perties. Woven wire cloth made from a nickel based alloy is produced to meet certain criteria. Special alloy constituents combine a high corrosion resistance to acids and lyes with temperature resistance. Alloy 59 offers a large application field in alkalines and acids.

Titanium and Aluminium based Alloys

Aluminium is a very soft and light material with good corrosion resistance. As for the austenitic materials the corrosion resistance results from a passivation coating that is formed in the air. ALMg3 and ALMg5 are alloyed with magnesium and have a higher tensile strength than highgrade aluminium (coat).

Titanium is a material with very good corrosion resistance to a number of aggressive media. It is used in the air-, space- and medical industries.

The excellent relation ship between tensile strength and density is comparable to austenitic materials.

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