I think feritic steel category materials like SA213T91 of T92 can be used in stead of 304SS
Believe, that the key is not to know that 304 has to be replaced but WHERE? What kind of environment, what properties it has, if can be magnetic, if working in tension condition, and - at last, but should be the first: what international regulations says. The worst and more dangerous is offshore applications, what we can hear from time to time in News (such as last BP's disaster).
Janusz has it exactly - you need to find the best (i.e. most economical) material for the required service - this may be less expensive than 304, but it may also be more expensive if the conditions are severe.
Hi all, thank you for your help
The application is bi directional deflection mechanism of ablation cathter used for cardiac arrhythmia treatment. I am trying to find a low cost alternate material for puller wire which is 304 SS currently used. Assembly involves crimping and welding to join different parts.
Frankly, if this is a wire in a surgical device I would expect that the basic material cost is absolutely negligible compared to fabrication costs and especially the costs of litigation if the component fails!
Dont know prices, but it You need fully chemical resistant material such as 1.4828/306 or other with high content of chrome and nickel. Taking into consideration ablation process, dont know why engineers propose 304SS (which may work to ca. 850 Celsius degrees where (in most cases) no more than 80 degrees is needed? If I were You I would to made a lot of laboratory corrosive test in similar environment as material should works. Of course, what Robert Alan Cottis says has to be considered, especially - what to do if device will fail and someone die?
Hi Robert and Janusz
That's right. I am working on talking with different suppliers about the cost details for fabrication.
304 SS is not used in ablation tip. This is used in form of puller wire to deflect tip in both directions(curves) which is controlled from handle. It will not be in contact with blood as it is inside of polymer tube unless the tube breaks or has any leaks. In search of different opportunities of cost reduction, just curious to know about any low cost alternative suggestions for 304 SS.
Properties i considered is Tensile and yield strength, Weld ability, and should be bio compatible.
Should be compatible with wire and rest equipment to prevent any galvanic corrosion. Once upon the time I faced problem of corrosion of SS elements, and no one knows what was happened. I guess, that some of workers fitting parts of equipment (made of SS) use ordinary wire brush to clean the pipes. So, only few addition of carbon to surface of SS made environment to act in other way and SS stopped to be corrosive resistant. Backing to your question I believe than even polymer may be use for steering. Maybe some king of polyurethane composite? But always the best will be the same material than tip is made of.
Sure Janusz, i will check on polymer alternative too.
Thank you all for your suggestion :)
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