On the basis of the specification, the specific fluid to be pumped and other boundary conditions, we will recommend to you proven materials. For pump casings and impellers, one can choose from a wide range of suitable material solutions, from grey iron through to wear resistant high-chrome iron to stainless steel and nickel-based alloys. Depending on the customer's wishes, generally all cast materials are available.
Policy
When choosing a material for our pump components, the following criteria are the most important:
- Mechanical/structural strength
- Resistance to abrasion
- Resistance to corrosion
- Suitability in relation to the particular fluid flowing through
Cast:
GG: Grey cast iron with lamellar graphite
For general applications without any corrosion or abrasion requirement.
GGG: Spheroidal cast iron with spheroidal graphite
For general applications without any corrosion or abrasion requirement.
Hard Iron HG 25.3
Extremely abrasion resistant material. For wastewater and slurries containing lots of sand. Resistant against weak acids and weak lyes.
Stainless steels:
Steel castings with at least 13% chromium content are designated as non-rusting stainless steels or Inox.
The alloy content, primarily chromium, nickel and molybdenum, form a thin passive layer on the surface which is responsible for the corrosion protection. The surface refreshes itself constantly through the presence of oxygen (air, water). The main component of stainless steel is always iron.
Stainless steel 1.4409 (Austenitic)
Equivalent designations: A4, V4A, Inox, Nirosta
Resistant against weak acids and weak alkalis. Increased resistance against intercrystalline corrosion. Resistant against fluids with low chloride content. Moderately wear-resistant.
Duplex stainless steel 1.4593 (Austenitic-Ferritic)
Equivalent designation: CD4MCu
Resistant to a number of mixed acids and mixed alkalis. Increased resistance to stress corrosion cracking, especially from fluids containing chlorides. Moderate to good resistance to wear.
Highly corrosion-resistant stainless steel 1.4588 (Austenitic)
Resistant to a number of acids and alkalis. High resistance to stress corrosion cracking, especially from fluids containing chlorides. Moderately wear-resistant.
Nickel-based alloys:
In contrast to stainless steels, nickel-based alloys have nickel as their main component. Iron is only present in small amounts. The element, nickel provides these materials with very high resistance to corrosion. Through the addition of other alloying elements, especially copper, chromium, molybdenum, and tungsten, specific properties can be achieved.
Hastelloy C-2000 / Hastelloy B3 (Nickel-based)
Hastelloy is suited for a variety of highly corrosive acids, depending on temperature and concentration. Hastelloy alloys are moderately wear-resistant.
Hastelloy is a registered brand name. Inconel is a competing product with similar properties.
Monel 411 (Nickel-based)
Very often used with sea water and brines to a maximum of 120°C. Highly resistant to hydrofluoric acid (HF) over a wide temperature and concentration range. Moderate to poor wear resistance.
Nickel 210 (Nickel-based)
Most important use is for sodium hydroxide (NaOH) and other alkalis. Moderately wear-resistant.