TECHNICAL 41
Working with stainless steel
By
PFERD South Africa
Stainless steel ( INOX ) is often a first-choice material to work with because of its corrosion resistance , longevity , and cost-effectiveness . Working with INOX , however , does pose some challenges – especially if incorrect tools and processes are used .
As part of their service to customers , PFERD South Africa offers guidance on working with stainless steel and ensure customers benefit from everything this versatile material has to offer .
Marius Steyn , Training Manager at the company explains , “ The South African stainless steel and steel industries are well established in the supply of high-quality steel . Stainless steel applications can be found in all the major industrial sectors , be it food , beverage , pharmaceutical or automotive and it is important to achieve the specified surface conditions and finishing . To obtain a high standard , certain tools and in-situ arrangements need to be adhered to for the process to be successful and cost-efficient ”.
Establish the Function Differing surface functions determine the final surface roughness and finish of the stainless steel . Industrial applications , for example , may require a surface definition that prevents bacterial growth to ensure a safe and hygienic environment as well as to maintain corrosion and wear resistance to prevent structural damage .
In the retail or architectural sector , aesthetics take precedence and priority is placed on the stainless steel ’ s final appearance . Therefore , it is important to establish what function the finished stainless-steel surface will perform .
Eliminate Cross Contamination Stainless steel is an alloy of iron with a minimum of 10.5 % chromium . Chromium produces a thin layer of oxide on the surface of the steel — the ‘ passive ’ layer — this prevents surface corrosion .
Damage to the passive chromium layer , caused by incorrect working methods can lead to the stainless-steel rusting . Crosscontamination of INOX is one form of damage that can cause it to rust .
“ The prevention of cross contamination of non-stainless with stainless steel is a crucial factor when working with stainless steel in workshops . The company advises customers to protect the work components at hand from surface contamination and
PFERD contamination from other materials ,” Steyn said .
Sparks from close by metal cutting and grinding operations can embed themselves in the stainless steel and lead to its eventual deterioration . This can occur sometime after installation of the stainless-steel products and would then require costly repairs in accordance with best practises .
Only specialised grinding and polishing components for stainless steel should be used and all non-stainless consumables should be avoided due to the possibility of contamination .
Working with stainless steel .
“ Differing surface functions determine the final surface roughness and finish of the stainless steel .”
February 2022 Volume 27 I Number 12 www . plumbingafrica . co . za