Profiles and Material

Exclusively stainless steel materials are used in our products, the evident criteria for it being the excellent corrosion resistance properties, whereby we always comply with the regulations of the norm NACE (National Association of Corrosion Engineers). However, corrosion resistance is only guaranteed if all important parameters are considered. For instance operational temperatures are quite often a neglected perilous factor in the determination of the corrosion resistance and also for the structural strength. Therefore a careful analysis of all operational conditions is recommendable. In this regard we offer our experience and assistance for the evaluation.

High flow rates combined with high screen surface loadings in high collapse pressures or surface stresses, as well as high burst pressure and high bending stresses, have required a variety of profiles being selected by scientific research such as flow pattern and loading tests. The correct selection and specific combination of profiles in a con-slot Screen structure are the secret of the economical efficiency of our products

Technical Data

Profile 1

Profile 2

Profile 3

Material List

Profile 4

Not each profile is available from stock in all materials as noted in the material list. The availability is subject to continuous demand.

Cr = Chromium – Melting point 1920 degrees C

Cr renders steel oil and air-hardenable. By reduction of the critical rate of cooling necessary for martensite formation, it increases hardenability, thus improving its susceptibility to hardening and tempering. Notch toughness is reduced however, but ductility suffers only very slightly. Weldability decreases in pure chromium steels with increasing Cr content. The tensile strength of the steel increases by 80-100 N/mm² per 1 % Cr. Cr is a carbide former. Its carbide increases the edge-holding quality and wear resistance. High temperature strength and high pressure hydrogenation properties are promoted by chromium. Whilst increasing Cr contents improve scaling resistance, a minimum content of about 13% chromium is necessary for corrosion resistance of steels; this must be dissolved in the matrix. The element restricts the gamma phase and thus extends the ferrite range. It does however stabilize the austenite in austenitic Cr-Mn and Cr-Ni steels. Thermal and electrical conductivity are reduced. Thermal expansion is reduced (alloys for glass sealing). With simultaneously increased carbon content, Cr contents up to 3 % increase remanence and coercive force.

Mn = Manganese – Melting point 1221 degrees C

Mn deoxidizes. It compounds with sulphur to form Mn sulphide, thus reducing the undesirable effect of the iron sulphide. This is of particular importance in free-cutting steel; it reduces the risk of red shortness. Mn very pronouncedly reduces the critical cooling rate, thus increasing hardenability. Yield point and strength are increased by addition of Mn and, in addition, Mn favourably effects forgeability and weldability and pronouncedly increases hardness penetration depth. Contents >4% also lead with slow cooling to formation of brittle martensitic structure, so that the alloying range is hardly used. Steels with Mn contents > 12% are austenitic if the C content is also high, because Mn considerably extends the gamma phase. Such steels are prone to very high degree of strain hardening where the surface is subjected to impact stress, whilst the core remains tough. For this reason, they are highly resistant to wear under the influence of impact. Steels with Mn contents of > 18% remain unmagneticable even after relatively pronounced cold forming and are used as special steels as well as steels remaining tough at subzero temperatures which are subjected to low temperatures stress. The coefficient of the thermal expansion increases as a result of Mn, whilst thermal and electrical conductivity are reduced.

Mo = Molybdenum – Melting point 2622 degrees C

Mo is usually alloyed together with other elements. Re­ducing the critical cooling rate improves hardenability. Mo significantly reduces temper brittleness, for example in the case of CrNi and Mn steels, promotes fine grain formation and also favourably effects weldability. Increases in yield point and strength. With increased Mo content, forgeability is reduced. Pronounced carbide former, cutting properties with high speed steel are improved thereby. It belongs to the elements which increase corrosion resistance and is therefore used frequently with high alloy Cr steels and with austenitic CrNi steels. High Mo contents reduce susceptibility to pitting. Very severe restriction of the gamma phase. Increased high temperature strength, scaling resistance is reduced.

Ni = Nickel – Melting point 1453 degrees C

With structural steels produces significant increase in notch toughness, even in the low temperature range, and is therefore alloyed for increasing toughness in case-hardening, heat-treatable and subzero toughness steels. All information points (A1-A4) are lowered by Ni; it is not a carbide former. As result of pronounced extension of the gamma phase, Ni in contents of > 7% imparts austenitic structure to chemically resistant steels down to well below room temperature. Ni on its own only makes the steel rust resistant, even in high percentages, but in austenitic Cr-Ni steels results in resistance to the effect of reducing chemicals. Resistance of these steels in oxidizing substances is achieved by means of Cr. At temperatures above 600 degrees C, austenitic steels have greater high temperature strength, as their recrystallization temperature is high. They are practically unmagnetizable.
Thermal and electrical conductivity are significantly reduced. High Ni contents in precisely defined alloying ranges lead to physical steels with certain physical properties, low thermal expansion (invar types).

Ti = Titanium – Melting point 1727 degrees C

On account of its very strong affinity for oxygen, nitrogen, sulphur and carbon, has a pronounced deoxidizing, pro­nounced denitriding, sulphur bonding and pronounced carbide forming action. Used widely in stainless steels as carbide former for stabilization against intercrystalline corrosion. Also possesses grain refining properties. Ti restricts the gamma phase very pronouncedly. In high concentration, it leads to precipitation processes and is added to permanent magnet alloy on account of achieving high coercive force. Ti increases deep rupture strength through formation and special nitrides. Finally, Ti tends pronouncedly to segregation and banding.

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con-slot SCREENS | Industriegebiet Hafen | Graue Riethe 2 | D-29378 Wittingen
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