Chemical production
chlorides, hydrochloric acid, sulphuric acid, mixed acids, alternating oxidising and reducing conditions.
Hastelloy piping for corrosive media in the chemical industry.
When stainless steel is no longer sufficient, we work with nickel-based alloys such as Hastelloy. For chlorine-containing media, hot acids and combined loads where corrosion would otherwise determine the service life of the plant. Qualified welders, documented welds, workshop in Pratteln.
Services · Hastelloy
Who it is for
Hastelloy is used where other materials fail:
Pharma and fine chemicals
reactor periphery, feed and discharge lines for aggressive reagents.
Waste gas and waste water treatment
lines with high chloride contents and temperatures.
Materials and processes
We work with the Hastelloy grades commonly used in the chemical industry, generally from the C family. Which alloy is suitable depends on the medium; we agree the choice with your materials engineering department.
Nickel-based alloys require their own welding technique: clean preparation, matched filler metal, controlled heat input, root shielding. We weld Hastelloy by the TIG process, and pipe-to-pipe joints by orbital welding where required. Every weld is assigned to the welder and the heat, so that traceability is complete.
We design dissimilar joints to stainless steel or PTFE-lined sections so that no corrosion occurs at the transitions.
Step by step
How we work
- Step 01
Clarification of the medium
concentration, temperature, impurities, operating mode.
- Step 02
Choice of material
together with your materials engineering department or the plant supplier.
- Step 03
Procurement
pipes, fittings and filler metals with material certificate.
- Step 04
Prefabrication in Pratteln
welding under controlled conditions, testing, spool numbers.
- Step 05
Installation
short jobs on site, usually in a shutdown.
- Step 06
Documentation
according to your form: certificates, weld logs, test results.
FAQ
Frequently asked questions
When does a line need Hastelloy instead of stainless steel?
When the medium attacks stainless steel: typically with high chloride contents, hot acids or alternating oxidising and reducing conditions. Hastelloy is more expensive, but under these conditions it lasts many times longer.
How is Hastelloy welded?
By the TIG process with matched filler metal and root shielding, and for pipe-to-pipe welds also by orbital welding. Heat input is kept low in order to preserve the corrosion resistance of the alloy.
Can you join Hastelloy to stainless steel?
Yes. Transitions are made so that no corrosion occurs at the joint. Where necessary, we use flanged connections instead of dissimilar welds.
Do you supply material certificates for Hastelloy?
Yes. Pipes, fittings and filler metals are procured with a certificate, and every weld is assigned to the heat and the welder, provided you order this documentation.
Contact
Let's talk about your project.
Hohenrainstrasse 10b, 4133 Pratteln · Mon–Fri 07:00–12:00 and 13:00–16:00