Chemical Resistance

LORO-XCL Stainless Steel

When using LORO-XCL stainless steel material for ships, offshore platforms or in the seawater zone, a material grade of 1.4404 must be used.

Due to their molybdenum content of 2 - 2.5%, the materials 1.4404 and 1.4571 exhibit good to very good corrosion resistance against the chlorides present in seawater.

In the past, material grade 1.4404 has proven to be resistant and very well suited for use in areas with moderate chloride and salt concentrations. In this regard we refer to many years of trouble-free use in, for example, swimming pools, as well as on ships as drainage pipes and deck drainage, which are flushed with fresh rainwater at regular intervals and are thus self-cleaning.

We point out that for safety-relevant components which cannot be cleaned regularly, or which are not flushed with fresh water and are therefore permanently and intensively exposed to seawater, a material grade of 1.4529 with a higher molybdenum content must be used. Unfortunately, the processing of this material grade is currently not possible for the company LORO.

LORO-X Steel, Hot-Dip Galvanised

In the 1976 publication by Zinkberatung e.V. "Verhalten von Zink gegen Chemikalien" (Behaviour of Zinc against Chemicals), Vol. 3, it states:

"If the proportion of salt is <0.2 g/square metre per day or <0.01 mm per year, there is good resistance." Resistance at higher concentrations must be examined on a case-by-case basis.

If chlorates are used, the zinc coating can be expected to be resistant. Chlorides,
on the other hand, must generally be regarded as critical and may lead to
erosion of the zinc coating. In the technical regulations for metalwork in the roofing trade, item 9.5.60 describes galvanised material as generally not chloride-resistant.

Salt-Bearing Condensate

LORO-X steel drainage pipes made of hot-dip galvanised steel with an additional internal coating are normally to be regarded as resistant to salt-bearing condensate. However, the consistency of the aqueous solution must be observed. By way of comparison, hot-dip galvanised steel crash barriers - which are exposed to road salt - may be considered.

Cast Iron Gratings

The use of cast iron gratings in parking deck drainage corresponds to the current state of the art. The selection and manufacture of the drains is carried out according to the required load classes. These are regulated in the standard DIN EN 1253-2. Cast iron grating units are used as standard in road traffic; here, no chloride effect on the grating unit is known to us.

In the commonly occurring "acid rain", the acid concentration is generally to be regarded as uncritical for our standard drains, pipes and fittings. The customary and approved green roof structures, substrates and concrete types (non-leaching) are also usually to be regarded as uncritical.

In principle, acid resistance depends on several object-specific factors, so that a universally valid statement is not possible. For example, the expected temperature and concentration.

In the case of elevated acid concentration, we recommend our LORO-XCL stainless steel pipe in material grade 1.4404/ 1.4571 in combination with our FKM sealing elements.