Expanite surface hardening replaces hard chrome plating in the food industry

Date 10.02.2019 | Category: News
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Expanite IDM Oct19

LIAG LÄUFER is a specialist in hygienic shutter valves and pigging systems. The products are designed to meet the highest safety demands in the food industry, and must withstand significant abrasive wear and corrosion aggressive environment. Their stainless steel cones were originally specified with hard chrome plating. Due to the potential health risks however, hard chrome plating is increasingly prohibited in the food industry. LIAG LÄUFER needed to find an alternative. In their attempt to solve these challenges LIAG LÄUFER tried different surface hardening solutions, which all failed, including a commonly used carburizing process, which caused corrosion after short time in use.


LIAG LÄUFER finally tested Expanite and found a hardening solution that effectively reduces wear and galling, and at the same time improves corrosion resistance of the parts.


LIAG LÄUFER is determined to offer environmentally sustainable solutions to comply with the industry demand to exclude chrome in the food industry. Expanite hardening solution is a diffusion-based process and therefore significantly more environmentally friendly and sustainable compared to other hardening methods.


Says Lars Meesmann - Project Engineer at LIAG LÄUFER: “Our cooperation with Expanite was highly successful. We are very satisfied with the impressive results of the unique Expanite technology which completely meets all our demands and expectations. Expanite´s support, knowledge and experience throughout this project have been first-class.” Mr. Lars Meesmann continues: “The technology is very flexible - and applicable independent of geometry of the product. The superior corrosion properties, lead-time and even a price competitive solution enables LIAG LÄUFER to supply customers with high end and environmentally safe products.”


The patented Expanite process doesn’t add anything to the material (besides nitrogen and carbon), it just makes the surface harder — as much as 10 times harder. Sales Manager Dr. Holger Selg explains: “The process begins with treating stainless steel parts under certain atmospheric conditions, which diffuses nitrogen and carbon atoms into the surface of the part. It passes ASTM tests, and the resulting products meet all FDA regulations and are ISO 9001:2015 compliant. We’re only diffusing nitrogen and carbon into the surface of the workpieces, so it’s called surface hardening”. For more visit expanite.com/surface-hardening-of-stainless-steel/


Source: Expanite
Author: COX
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