Overview

Valves & Fittings

Valves and Fittings

Valves are components that regulate and inhibit the flow of various matters. In many industry sectors valves are exposed to high wear strain. Depending on the field of application, abrasive wear, cold wear on metallic tribological pairings and seals as well as cavitation and thermal wear can occur. Definite improvement regarding durability and reliability of affected components can be achieved by BorTec’s boronizing technique Borodur®. The diffusing of bor into the surface of the material enables the production of hard and resistant layers of borid which distinguishes itself by its outstanding persistence against wear. Furthermore, the layers of borid show great heat tolerance of up to 1,000°C. In the following, exemplary applications of the layers will be explained.

Within the safety relevant application ranges of chemical plants as well as the oil and gas conveyor technique, high demands are made on the functionality and operational safety of valves, gate valves and control fittings.

No other diffusion method for surface hardening achieves comparable improvements of the mechanical properties of stainless steels and nickel-based alloys with regard to hardness and wear protection. No matter whether in hot gas atmosphere or HS2-containing Subsea applications – Borocoat® treatment is the most competitive and efficient solution.

Application examples of boronizing in valve engineering

High demands on valves are found particularly in power plant engineering, oil refineries, and chemical industry. Valves, seals, gate and control valves, as well as many other components are exposed to abrasive and corrosive matter. In addition to that, these components are often subjects to high temperatures and pressure, or a combination thereof. Aside from abrasive wear, cold wear regularly occurs when it comes to metallic  sealant pairings. Austenitic steels, highly heat resistant steels, and nickel-base alloys are affected in particular.  BorTec offers advanced boronizing processes for these particular cases which increase wear protection while eliminating cold wear on sealant pairings. Not only will the durability of the components be improved, but so will reliability and dependability. For these reasons alone, we are trusted by renowned suppliers from the oil- and gas industry as well as mechanical engineers that need their valuable units to be refined for best wear protection.

In plants that smelt metals, the protection of control valves, agitators and conduits proves to be a particularly difficult challenge for wear protection.  However, boronizing of low-level and high-level alloys extends the service life of respective components significantly. The surface is protected from liquid metal and wetting capacities are reduced. Components can be easily cleaned while also resisting corrosion attacks. Valves in plants that produce a lot of dry bulk and dust are often subject to high abrasive wear strain. By means of Borocoat®, surfaces are protected against wear and demonstrate high hardness. Power plants that produce and use coaldust and use Borocoat® are superior to power plants that use components protected by usual wear protection methods.

Another strain that occurs at the usage of valves and turbines is cavitation. Implosions of liquids within blowholes causes a disruption on the surface which induces wear and even failure of respective components. Boronizing improves the surface hardness though.

 

 

Which materials can become resistant with Borocoat®?

Low-level alloyed, stainless and heat-resistant steels as well as nickel-based alloys are used in valves engineering. For every single one of these materials BorTec offers a customized boronizing solution. On principle, the majority of cast iron, steel classes, and nickel-based alloys can be boronized. Approach us if you would like to receive more comprehensive consulting. We would love to help you out.

Our service for valves engineering

We at BorTec have specialised in tempering of components of valves engineering. Therefore, we can offer our clients custom-built solutions, even in connection to further tempering. Our purpose-built processes based on the most up-to-date facilities guarantee optimised results. For decades, we have developed boronizing agents such as EKABOR®. Thereby, we are able to find solutions for any material and application.

Borocoat®-diffusion coatings protect against:

  • cold welding and galling
  • abrasive wear
  • cavitation
  • fatigue

Properties Borocoat®

  • High hardness of 1400-2800HV depending on the base material
  • High layer hardness also on unalloyed steels
  • Significantly improved adhesion compared to conventional hard material coatings
  • High resistance against abrasive wear
  • High resistance against adhesive wear
  • Good stability at high temperatures
  • Good resistance against meltings of Al and Zn
  • Good behaviour with respect to acids

Detailed information on the properties of the boride layers can be downloaded here.

Borided Oil Tools